Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head Valve Drive (Page GR-15)
Engine Code - PG
Camshaft
assembly
identification
oil seal removing/installing
play, checking
removing/installing
Cylinder head
assembly
compressor, checking
distortion, checking
installing
Valve
assembly
dimensions
exhaust valves, discarding
guides, checking
guides, replacing
hydraulic valve lifters, checking
seats, refacing
stem seal, removing/installing
Engine Code - AAA
Camshaft
assembly
axial play, checking
bearing caps, installed position
removing/installing
Compression pressure
checking values
Cylinder head
assembly
distortion checking
gaskets, replacing
installing
Valves
assembly
dimensions
guides, checking
guides, replacing
hydraulic valve lifters, checking
seats, replacing
stem seals, removing/installing
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-2)
CAUTION!
Coolant antifreeze must not be reused when replacing engine, cylinder head, cylinder head
gasket, radiator and heater core.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-3)
Fig. 1 Cylinder head, distortion checking
Notes
Cylinder head should be clean and free of gasket material before performing this check.
use straight edge and feeler gauge to check for distortion
US 1030
maximum permissible distortion allowed: 0.1 mm (0.004 in.)
Cylinder head, installing
install cylinder head gasket
note correct position
screw in guide bolt from tool in threaded holes and
3070 8 10
install cylinder head
fit all cylinder head bolts
remove guide bolt with tool and replace with cylinder head bolt
3070
hand tighten only
Tightening torque: engine cold
tighten in sequence to 40 Nm (29 ft lb)
tighten in sequence to 60 Nm (43 ft lb)
tighten in sequence additional 1/2 turn (180 ) further in one movement (two 90
turns are permissible)
remove cylinder head bolts in reverse sequence
Notes
It is not necessary to re-tighten cylinder head bolts during scheduled maintenance or after
performing repairs.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-4)
Compression pressure, checking
engine oil temperature minimum 30 C (86 F)
throttle plate completely open
ignition coil lead removed from ignition distributor and connected to ground
check compression pressure using pressure recorder
US 1120
follow operating instructions for recorder
operate starter until recorder unit indicates no further pressure increase
Compression pressure values bar (psi)
Engine code letters New Wear limit
8-12 6
PG
(116-174) (87)
permissible difference between all four cylinders: 3 bar (43.5 psi)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-5)
Notes
Heads with fine cracks between valve seats or a valve seat ring and plug threads can be installed
again without reducing engine service life provided that cracks are small and not more than 0.5
mm wide or when only the first coils of the plug threads are cracked.
CAUTION!
Coolant/antifreeze must not be reused when replacing engine, cylinder head, cylinder head
gasket, radiator and heater core.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-6)
Fig. 1 Camshaft, axial play, checking
measure with valve lifters removed, and bearing caps and removed
1 5
wear limit: 0.15 mm (0.006 in.)
Fig. 2 Camshaft identification
Identification between cams
Engine code Cylinder one Cylinder three
arrow A arrow B
PG A 026
Fig. 3 Valve dimensions
Intake Exhaust
a
40.00 mm (1.575 in.) 33.15 mm (1.305 in.)
b
7.97 mm (0.314 in.) 7.94 mm (0.313 in.)
c
91.40 mm (3.598 in.) 91.45 mm (3.6 in.)
45 45
CAUTION!
Do not reface valves, only reface seats.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-7)
Valve seats, refacing
Calculating the maximum permissible refacing dimension
insert valve and hold firmly against valve seat
measure distance between end of valve shaft and upper edge of cylinder head
a
calculate refacing dimension (see example) using the measured distance
b a
(above) and:
Minimum dimension
Minimum dimension - intake valve = 33.8 mm
Minimum dimension - exhaust valve = 34.1 mm
measured distance a
- minimum dimension
= maximum permissible refacing
dimension
b
If the measured distance is smaller than the minimum dimension, the hydraulic valve lifter will
a
not work and the cylinder head must be replaced.
Intake valve seat, refacing
- diameter 39.2 mm (1.543 in.)
a
- maximum permissible refacing dimension
b
- approximately 2.0 mm (0.079 in.)
c
- cylinder head lower edge
Z
30 - upper correction angle
45 - valve seat angle
Exhaust valve seat, refacing
- diameter 32.4 mm (1.276 in.)
a
- maximum permissible refacing dimension
b
- approximately 2.0 mm (0.079 in.)
c
- cylinder head lower edge
Z
30 - upper correction angle
45 - valve seat angle
Exhaust valve seat rings are also made with a narrowed diameter. When refacing make sure
radius of the narrowed diameter is not damaged.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-8)
Hydraulic valve lifters, checking
CAUTION!
After replacing lifters, do not start engine for approximately 30 minutes, otherwise valves
may hit piston. Lifter must be allowed to bleed down to proper adjustment.
Always place removed valve lifter on a clean surface with the contact surface (camshaft side)
facing downward.
Always replace complete valve lifter. Lifter cannot be adjusted or repaired.
Unusual noise from valve lifter while starting is normal.
run engine until radiator fan comes on at least once
bring engine speed to approximately 2500 RPM for two minutes
If valve lifter is still noisy, replace as follows:
remove cylinder head cover
turn crankshaft pulley bolt clockwise until cam lobes of cylinder to be checked point
upward
push down against valve lifter with light pressure using a suitable wood stick (as
shown). If valve lifter can be pushed down more than 0.1 mm (0.004 in.) replace
lifter
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-8a)
Exhaust valves, discarding
Before discarding exhaust valves read this warning:
WARNING!
Exhaust valves are sodium filled. Before discarding these valves neutralize the sodium to
avoid possible injury to people in the recycling chain.
Before discarding observe the following:
always wear protective goggles or glasses
note that sodium reacts violently with water
when cutting valves, valves must not come into contact with water
use grinding equipment which does not use water or other liquids for lubrication
and/or cooling
to neutralize sodium, drop cut-off valve stems into a bucket of water and move
quickly away from water bucket
do not drop more than 10 valve stems at a time into water bucket
Discarding procedure
use grinding stone or grinding disc to cut valve stem off near head of valve
drop cut-off valve stems into bucket of water (sodium will now react with water)
once reaction has stopped (water stops bubbling) scrap valve stems
water is biodegradable and may be discarded accordingly
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-9)
Camshaft oil seal, removing
remove upper drive belt cover
set crankshaft to TDC on cylinder no.
1
slacken drive belt and remove
remove camshaft sprocket
remove woodruff key from camshaft
install mounting bolt for camshaft sprocket with washer up to stop
remove inner part of oil seal extractor two turns (approximately 3.0 mm) from
2085
outer part of tool and lock with screw
lubricate threaded head of oil seal extractor. Mount and push in as far as possible
into oil ring
loosen knurled screw and turn inner part of puller against camshaft until oil seal is
pulled out
clamp extractor in vise and remove oil seal with pliers
Camshaft oil seal, installing
coat oil seal seat and seal lip lightly with oil
press oil seal into cylinder head until using , with special hex head bolt
flush 10-203
10-203/1
reinstall drive belt, per Repair Group 13
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-10)
Camshaft, removing
remove upper drive belt cover
remove cylinder head
turn crankshaft to TDC on cylinder
1
slacken and remove drive belt
remove camshaft sprocket
remove woodruff key from camshaft
remove bearing caps
1, 3
loosen bearing caps and alternately and diagonally
2 5
Camshaft, installing
When installing the camshaft, the cams for number cylinder must be pointing upwards. When
1
installing bearing caps, note center offset of bore. Before installing caps, place in position and
determine installed position.
tighten bearing caps and alternately and diagonally
2 5
tightening torque: 20 Nm (15 ft lb)
install bearing caps and
1 3
tightening torque: 20 Nm (15 ft lb)
position camshaft sprocket and tighten
tightening torque: 80 Nm (59 ft lb)
reinstall drive belt, see Repair Group 13
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-11)
Valve guides, checking for wear
CAUTION!
Once guide shoulder is seated do not use more than 1 ton pressure or guide shoulder may
break.
Due to slight difference in stem dimensions, use intake valve in intake guide, and exhaust
only
valve in exhaust guide.
remove carbon
install and dial indicator
VW 387
insert new valve into valve guide
valve stem end must be flush with valve guide end
rock valve back and forth ( ) against dial indicator. Dial indicator reading shows
arrow
valve guide wear
Intake Exhaust
valve valve
Maximum dial 1.0 mm 1.3 mm
indicator reading (0.039 in.) (0.051 in.)
Valve guides, replacing
Cylinder heads on which the valve seat surface can no longer be refaced or cylinder heads that
have been refaced down to the minimum dimension cannot be repaired further.
press worn valve guides out from camshaft side with tool
10-206
valve guides with shoulder (service version) must be pressed out from
combustion
side
coat new guides with oil and press into cold cylinder head to the shoulder from
camshaft side with tool
10-206
ream valve guides by hand with reamer tool
10-215
use proper cutting lubricant
reface valve seats
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-12)
Valve stem seal, removing
(with cylinder head installed)
CAUTION!
Once guide shoulder is seated do not use more than 1 ton pressure or guide shoulder
may break.
remove spark plugs
remove camshaft and hydraulic lifters
turn crankshaft until piston of cylinder concerned is in BTDC position
install tool and adjust to stud height
2036
insert pressure hose or into spark plug threads and apply steady
US 1106 VW 653/3
pressure of at least 6 bar (87 psi)
remove valve springs with lever
VW 541/1
If valve keepers are very hard to come out, they can be loosened by tapping on assembly
lightly
lever with hammer.
remove valve stem seal with tool
3047 A
Valve stem seal, installing
slide plastic sleeve onto valve stem
A
lubricate valve stem seal
B
push seal carefully onto valve guide using plastic seal protector
CAUTION!
When installing valve stem seals, always use plastic sleeve to prevent damage.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-13)
WARNING!
DO NOT re-use any fasteners that are worn or deformed in normal use. Many fasteners are
designed to be used only once and become unreliable and may fail when used a second
time. This includes but is not limited to, nuts bolts, washers, self-locking nuts or bolts,
circlips, cotter pins. Always follow recommendations given in this publication. For
replacements always use new parts.
CAUTION!
Part numbers are for reference only. Always check with your Parts Department for latest
information.
CAUTION!
Coolant/antifreeze MUST NOT be reused when replacing engine, cylinder head, cylinder
head gasket, radiator and heater core.
Notes
When replacing cylinder head, lubricate hydraulic valve and camshaft contact surface.
1 - Ignition cable guide
2 - Cap
3 - Cylinder head cover
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-14)
4 - Cylinder head cover gasket
always replace
note installation position
5 - O-ring
always replace
6 - Exhaust manifold
comes in 2 parts
with CO take-off pipe attached
removing and installing, see Repair Group 26
7 - 25 Nm (18 ft lb)
8 - Exhaust manifold gasket
two-piece
always replace
note installation position
9 - Chain tensioner for double drive chain 20 Nm (15 ft lb)
10 - 10 Nm (7 ft lb)
11 - Ignition distributor with rotor arm
replacing rotor, see Repair Group 28
12 - O-ring
always replace
13 - 10 Nm (7 ft lb)
14 - Retaining plate
15 - Camshaft cover
coat sealing surfaces with
AM, 188 001 02
reseal cylinder head gasket, see page 15-15
16 - Cylinder head gasket
always replace
note installation position
marking must face cylinder head
"TOP"
17 - Cylinder head
checking for distortion, see page 15-16
installing, page 15-17
18 - Cylinder head bolt
always replace
note torque and tightening sequence, see page 15-17
19 - Lower intake manifold gasket
always replace
20 - Upper intake manifold gasket
always replace
21 - Fuel rail - 10 Nm (7 ft lb) 22 - Lower intake manifold
23 - Tensioner for poly-ribbed belt
removing and installing, see Repair Group 13
24 - Intake manifold support
25 - 25 Nm (18 ft lb)
26 - Upper intake manifold
installing, first install and tighten lower intake manifold , then intake manifold support
22 24
27 - Trim cover
28 - 25 Nm (18 ft lb)
29 - Flame trap coil
30 - Circlip
31 - 10 Nm (7 ft lb)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-15)
Cylinder head gasket, replacing
CAUTION!
Part numbers are for reference only. Always check with your Parts Department for latest
information.
remove old sealant from 3.0 mm holes in cylinder head gasket ( )
arrows
fill holes with sealant
AMV 188 001 02
position cylinder head gasket on cylinder head
imprinted word must face cylinder head
"TOP"
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-16)
Cylinder head, checking distortion
Notes
Cylinder head should be clean and free of gasket material before performing this check.
use straight edge and feeler gauge to check for distortion
maximum permissible distortion:
0.1 mm (0.004 in.)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-17)
Cylinder head, installing
install cylinder head gasket
note installation position, check centering dowels at holes and
12 20
install cylinder head
fit all cylinder head bolts
hand tighten only
always replace
Tightening torque, engine cold
Tighten bolts in sequence:
Stage I = 40 Nm (29 ft lb)
Stage II = 60 Nm (43 ft lb)
tighten in sequence additional 1/2 (180 ) turn further in one movement
two additional 1/4 (90 ) turns are permissible
reverse sequence to remove bolts
Notes
It is not necessary to re-tighten cylinder head bolts during scheduled maintenance or after
performing repairs.
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-18)
Compression pressure, checking/values
Test conditions
engine oil temperature minimum 30 C (86 F)
throttle plate completely open
fuse removed
18
ignition coil lead removed from ignition distributor
check compression with pressure recorder
US 1120
follow recorder instructions
operate starter until recorder unit indicates no further pressure increase
Pressure values, bar (psi)
Engine code New Wear limit
AAA 11-13 7.5
(160-189) (109)
maximum permissible difference between all four cylinders: 3 bar (43.5 psi)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-19)
CAUTION!
Part numbers are for reference only. Always check with your Parts Department for latest
information.
CAUTION!
Coolant/antifreeze MUST NOT be reused when replacing engine, cylinder head, cylinder
head gasket, radiator and heater core.
Notes
Heads with fine cracks between valve seats or a valve seat ring and plug threads can be installed
again without reducing engine service life provided that cracks are small and not more than 0.5
mm wide or when only the first coils of the plug threads are cracked
1 - Bearing caps
installation position, see page 15-21
2 - 20 Nm (15 ft lb)
3 - Camshaft
checking axial play, see page 15-22
removing/installing, see page 15-27
checking radial clearance with plastigage:
wear limit:
0.1 mm (0.004 in.)
run out:
max. 0.01 mm (0.0004 in.)
identification: 021 109 101 M cylinders 1, 3, 5
021 109 102 A cylinders 2, 4, 6
4 - Camshaft sprockets
removing/installing/camshaft, page 15-27
5 - 100 Nm (74 ft lb)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-20)
6 - Distributor drive
7 - Distributor
replacing rotor, see Repair Group 28
8 - 10 Nm (7 ft lb)
9 - Seal
always replace
10 - Cylinder head
140 0.1 mm (5.5 0.004 in.)
minimum refacing dimension
= 139.5 mm (5.4 in.)
a
11 - Valves
dimensions, page 15-23
12 - Valve guide
checking wear, see page 15-30
replacing, see page 15-31
13 - Valve stem seal
removing/installing see page 15-32
14 - Valve springs, inner/outer
removing/installing with tool or and
2036 VW 541/5 VW 541/1A
15 - Upper valve spring seat
16 - Valve keepers
17 - Hydraulic valve lifter
interchange
DO NOT
self-adjusting hydraulic valve clearance
checking, see page 15-26
store with cam contact surface down
before installing, check camshaft axial play, see page 15-22
lubricate contact surface
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-21)
Camshaft bearing caps, installed position
Notes
When installing bearing cap, ensure marking on cap is readable from exhaust manifold side and
arrow points to vibration dampener side ( ).
inset
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-22)
Camshaft axial play, checking
measure with valve lifters removed, and bearing caps and or and installed
1 7 2 6
wear limit: 0.15 mm (0.006 in.)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-23)
Valve dimensions (in mm)
CAUTION!
Do not reface valves, only reface seats.
Intake Exhaust
a 39.00 34.20
b 6.97 6.95
c 105.95 106.95
45 45
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-24)
Valve seats, refacing (in mm)
Calculating the maximum permissible refacing dimension
insert valve and hold firmly against valve seat
measure distance between end of valve shaft and upper edge of cylinder head
a
calculate refacing dimension (see example) using the measured distance
b a
(above) and:
Minimum dimension
Minimum dimension - intake valve = 33.9 mm
Minimum dimension - exhaust valve = 34.1 mm
Example:
measured distance
a
- minimum dimension
= maximum permissible refacing dimension
b
Notes
If the measured distance is smaller than the minimum dimension, the hydraulic valve lifter will
a
not work and the cylinder head must be replaced.
Intake valve seat, refacing
= diameter 38.3 mm
a
= maximum permissible refacing dimension
b
= maximum 1.4 mm
c
if necessary rework valve seat insert with 75 correction cutter
= cylinder head lower edge
z
= 45 valve seat angle
= 30 upper correction angle
= 75 lower correction angle
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-25)
Exhaust valve seat, refacing
= diameter 33.5 mm
a
= maximum permissible refacing dimension
b
= maximum 2.0 mm
c
if necessary rework valve seat insert with 75 correction cutter
= cylinder head lower edge
z
= 45 valve seat angle
= 30 upper correction angle
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-26)
Hydraulic valve lifter, checking
CAUTION!
After replacing lifters, do not start engine for approximately 30 minutes, otherwise valves
may hit piston. Lifter must be allowed to bleed down to proper adjustment.
Notes
always place removed valve lifter on a clean surface with the contact surface
(camshaft side) facing downward
always replace complete valve lifter. Lifter cannot be adjusted or repaired
unusual noise from valve lifter while starting is normal
run engine until radiator fan comes on at least once
bring engine speed to approximately 2500 RPM for two minutes
If valve lifter is still noisy, replace as follows:
remove cylinder head cover
remove upper intake manifold
turn crankshaft pulley bolt clockwise until cam lobes of cylinder to be checked point
upward
push down against valve lifter with light pressure using a suitable wood stick (as
shown)
if valve lifter can be pushed down more than 0.1 mm (0.004 in.), replace lifter
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-27)
Camshafts, removing/installing
Removing
remove ignition cable guide
remove upper intake manifold
Notes
Cover intake channels with a clean cloth to prevent becoming contaminated.
With engine installed
set crankshaft to (cyl. number ) ( )
TDC 1 inset
remove distributor
remove cylinder head cover
unscrew chain tensioner
remove camshaft sprocket cover
Vehicles built up to 10.91
note rounded teeth
Vehicles built after 11.91
note pointed teeth
With engine removed
set flywheel marking to (cyl. number )
TDC 1
lug on flange must align with mark
remove ignition distributor
remove valve cover
remove camshaft sprocket cover
unfasten chain tensioner
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-28)
loosen camshaft sprocket bolts
Notes
Only hold camshafts with 24 mm spanner wrench at points shown ( ). The camshaft guide
arrows
must not be fitted when tightening/loosening the sprockets.
3268
remove camshaft sprockets
Notes
Before removing double chain mark direction of rotation with touch-up paint ( )
arrows
Camshaft cylinders, 1, 3, 5
remove bearing caps and
1 7
loosen bearing caps and alternately and diagonally
3 5
Camshaft cylinders 2, 4, 6
remove bearing cap
4
loosen bearing caps and alternately and diagonally
2 6
Installing
CAUTION!
Part numbers are for reference only. Always check with your Parts Department for latest
information.
note marking on the chain
Notes
When installing the bearing caps ensure that the marking can be read from the exhaust manifold
side and the arrow points to vibration dampener end.
Camshaft cylinders 1, 3, 5
tighten bearing caps and alternately and diagonally
3 5
torque 20 Nm (15 ft lb)
install bearing caps and
1 7
torque 20 Nm (15 ft lb)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-29)
Camshaft cylinders 2, 4, 6
tighten bearing caps and alternately and diagonally
2 6
torque 20 Nm (15 ft lb)
install bearing cap
4
torque 20 Nm (15 ft lb)
adjust valve timing, see Repair Group 13
clean camshaft sprocket cover sealing surfaces
clean old sealant from 3.0 mm holes in cylinder head gasket ( )
arrow
fill holes with sealant
AMV 188 001 02
clean sealing surfaces of cover and coat with
AMV 188 001 02
replace O-ring
reinstall cover, hand tighten all bolts
retighten all bolts
torque 10 Nm (7 ft lb)
install chain tensioner
torque 20 Nm (15 ft lb)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-30)
Valve guides, checking
Notes
When repairing engines with leaky valves, it is also necessary to check valve guides for wear.
This is particularly important on engines with high mileage.
Due to slight difference in stem dimensions, use intake valve in intake guide, and exhaust
only
valve in exhaust guide.
remove carbon
install and dial indicator
VW 387
insert new valve into valve guide
valve stem end must be flush with valve guide end
rock valve back and forth ( ) against dial indicator. Dial indicator reading shows
arrow
valve guide wear
Exhaust
Intake valve
valve
Maximum dial 1.0 mm 1.3 mm
indicator reading (0.039 in.) (0.051 in.)
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-31)
Valve guides, replacing
Notes
Clean and check cylinder head.
Cylinder heads on which the valve seat surface can no longer be refaced, valve guides have
been previously installed, or cylinder heads that have been refaced down to the minimum
dimension cannot be repaired further.
press worn valve guides with tool from camshaft side
3121
lay cylinder head flat on workbench
CAUTION!
Once guide shoulder is seated do not use more than 1 ton pressure or guide shoulder may
break off.
coat new guides with oil and press into cold cylinder head to the shoulder from
camshaft side with tool
3121
ream valve guides by hand with reamer
3120
use proper cutting lubricant
reface valve seats
Volkswagen Corrado 1990 - 1994
General Engine
Engine - Cylinder head, Valve Drive (Page 15-32)
Valve stem seals, removing/installing
(with cylinder head installed)
Removing
remove spark plugs
remove camshaft and hydraulic lifters
turn crankshaft until piston of respective cylinder is in position
BTDC
install tool and adjust to stud height
2036
insert pressure hose into spark plug threads and apply steady pressure of
VW 653/3
at least 6 bar (87 psi)
remove valve springs with lever and
VW 541/1A VW 541/5
Notes
If valve keepers are very hard to come out, they can be loosened by tapping on assembly
lightly
lever with hammer.
remove valve stem seal with tool
3047A
Installing
CAUTION!
Always use plastic sleeve A when installing valve stem seals, to prevent damage to the
seal.
slide plastic sleeve onto the valve stem
A
lubricate valve stem seal
B
push seal carefully onto valve guide using tool
3129
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