Land Rover Engine 1.8 Litre K Series. Manual — part 11
ENGINE
30
OVERHAUL
Valves and guides - inspection
NOTE: Two types of exhaust valve may be
fitted, standard valves, A in illustration or
carbon break valves, B in illustration.
Carbon break valves may be identified by the
machined profile C on the valve stem. To prevent
valves from sticking, standard valves should be
replaced with carbon break valves during engine
overhaul.
1. Remove carbon deposits from exhaust valve
guides using tool LRT-12-149.
CAUTION: Tool must be inserted into
valve guide from combustion face side of
cylinder head.
2. Remove carbon from inlet valve guides, inlet
and exhaust valves and valve seat inserts.
Remove all loose particles of carbon on
completion.
NOTE: Carbon break exhaust valve
illustrated.
3. Check and record existing valve stem
diameters A , replace any valve with stem
diameters less than specified.
4. Check inlet and exhaust valve guide
clearances C using the following procedures:
5. Insert valve into its respective guide.
6. Extend valve head 10 mm out of valve seat
and position a DTI gauge to rear of valve head.
7. Move valve towards front of cylinder head,
pre-load gauge to valve head then zero gauge.
8. Move valve towards rear of cylinder head,
record gauge reading obtained to give valve
stem to guide clearance C.
9. Repeat above procedures for remaining
valves.
Valve stem diameter A:
Inlet = 5.952 to 5.967 mm
Exhaust = 5.947 to 5.962 mm
Valve guides:
Inside diameter B:= 6.000 to 6.025 mm
Valve stem to guide clearance C:
Inlet = 0.033 to 0.063 mm
Service limit = 0.07 mm
Exhaust = 0.038 to 0.078 mm
Service limit = 0.11 mm
10. Renew valves and guides as necessary.
ENGINE
OVERHAUL
31
Valve guides - renew
1. Support cylinder head face down on wooden
blocks.
2. Position tool guide LRT-12-519-3 in tappet
bore and drift out valve guide using tool drift
LRT-12-519-1.
NOTE: Retain valve guides in their fitted
order.
3. Identify type of valve guide fitted:-
A - Standard production
C - Production oversize
NOTE: Two replacement sizes of valve
guide are available, sizes B and D, replace
original guide A with B and original guide
C with D.
NOTE: Cylinder head and valve guides
must be at room temperature when fitting
guides.
4. Locate valve guide in valve guide bore with
identification groove(s)towards valve seat;
position depth gauge:-
Use depth gauge LRT-12-519-2.
5. Position nylon guide LRT-12-5196-3 in
cylinder head, press guide into bore using
driver LRT-12-519-1 until depth gauge
contacts top of valve guide bore.
6. Check fitted height A of valve guide = 6.0 mm
ENGINE
32
OVERHAUL
Valve seat inserts - renew
CAUTION: Triple angle valve seat inserts
have been introduced on later engines;
these inserts are not interchangeable with
those fitted to early engines. Commencing
engine numbers for engines fitted with the new
inserts are listed in Information.
1. Renew valve seat inserts as necessary.
CAUTION: Do not damage counterbore
when removing insert.
2. Cool replacement valve seat inserts using
liquid nitrogen and press into cylinder head in
one continuous operation.
CAUTION: Do not heat cylinder head.
Engines not fitted with triple angle valve seats
Inlet
A:= 22.98 to 23.13 mm
B:= 25.73 to 25.98 mm
C:= 29.560 to 29.573 mm
D:= 38
°
E:= 29.475 to 29.500 mm
F:= 5.95 to 6.00 mm
G:= 6.53 to 6.69 mm
H:= 2.0 mm radius
J:= 0.75 to 1.25 mm
K:= 45
°
Exhaust
A:= 19.58 to 19.73 mm
B:= 21.60 to 21.90 mm
C:= 25.960 to 25.973 mm
D:= 30
°
E:= 25.888 to 25.913 mm
F:= 5.45 to 5.50 mm
G:= 5.75 to 6.41 mm
H:= 2.0 mm radius
J:= 0.75 to 1.25 mm
K:= 45
°
ENGINE
OVERHAUL
33
Engines fitted with triple angle valve seats
Inlet
A:= 15
°
B:= 45
°
C:= 60
°
D:= 0.4 mm radius
E:= 29.560 to 29.573 mm
F:= 1.0 to 1.4 mm
G:= 26.43 mm
H:= 29.475 to 29.500 mm
J:= 5.95 to 6.00 mm
K:= 6.16 to 6.32 mm
Exhaust
A:= 15
°
B:= 45
°
C:= 60
°
D:= 0.4 mm radius
E:= 25.960 to 25.973 mm
F:= 1.4 to 1.8 mm
G:= 22.83 mm
H:= 25.913 to 25.888 mm
J:= 5.45 to 5.80 mm
K:= 5.7 to 5.86 mm
All engines
3. Cut valve seat to correct angle and width.
4. Lap valve to seat.
Valve seats - refacing
CAUTION: Renew worn valve guides
before refacing valves and seats.
1. Check condition of valve seats and existing
valves that are to be re-used.
NOTE: Triple angle valve seat illustrated
2. Recut valve seats and use pilot MS120-6 and
the following cutters:-
MS76-120 - 15
°
- Triple angle valve seats
only.
MS76-111 - 60
°
- To narrow valve seats and
obtain seat widths.
MS76-122 - 45
°
- Make final cut and remove
any burrs.
Valve seat:
Angle = 45
°
Width A:
Except triple angle valve seats:-
Inlet - 1.5 mm
Exhaust - 1.5 mm
Width A:
Triple angle valve seats:-
Inlet - 1.0 to 1.4 mm
Exhaust 1.4 to 1.6 mm
Valve face angle B:
Inlet = 45
°
Exhaust = 45
°
CAUTION: Inserts must not stand proud of
combustion face of head on completion of
recutting operation.
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