DEFENDER
ENGINE
Lapping valves
15.
To ensure a gas tight seal between the valve
face and valve seat it is necessary to lap-in the
appropriate valve to its seat. It is essential to
keep t he valve identified with its seat o nce the
lapping-in operation has been completed.
Unless the faces t o be lapped are in poor
condition it should only b e necessary to use
fine valve lapping paste.
16.
Smear a small quantity of paste on the valve
face and lubricate t he valve stem with engine
oil. Insert the valve in the appropriate guide
and using a suction type valve lapping tool
employ a light reciprocating action while
occasionally lifting the valve off its seat and
turning it so that the valve returns to a
different position on the seat.
.
.
.
1
7. Continue the operation until a continuous matt
grey band round the valve face is obtained. To
check that the lapping operation is sucessful,
wipe off the valve paste from the valve and
seat and make a series of pencil lines across
the valve face.
I
I
I
18.
19.
20.
Insert the valve into t he guide and while
pressing the valve onto the seat revolve the
valve a quarter of turn a few times. If all the
pencil lines are cut through no further lapping
is necessary. Thoroughly wash the cylinder
head ensuring n o lapping paste remains before
fitting the valves.
Position the cylinder head with the combustion
face uppermost, lubricate and insert the valves
into their respective guides. To check the valve
head stand -down or the correct dimension of
the valve head below the combustion face, use
either a dial test indicator or a straight edge
and feeler gauge as follows.
Assembling valves to cylinder head
21.
Insert the valves to their respective guides and
locate a spring protection washer over each
guide. Fit new oil seals t o all the valve guides
with the garter spring uppermost. Ensure that
the seals fully locate o n valve guides.
Hold the straight edge across the centre of
each valve in turn and measure the gap
between the valve head and straight edge. The
correct dimension should be (0.
t o
040
to in). Using a dial gauge zero t he
gauge o n the combustion face then move the
stylus across t o the valve head and note t he
reading.
76
| Categories | Land Rover, Land Rover Defender 110, Land Rover Defender 130, Land Rover Defender 90 |
|---|---|
| Tags | Land Rover |
| Model Year | 1990 |
| Download File |
|
| Document Type | Workshop Manual |
| Language | English |
| Product Name | Defender 90, 110, 130 Td5, Tdi, V8 |
| Product Brand | Land Rover |
| Document File Type | |
| Publisher | landrover.com |
| Wikipedia's Page | http://en.wikipedia.org/wiki/Land_Rover |
| Copyright | Attribution Non-commercial |
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