Range Rover P38
12
ENGINE
NEW RANGE ROVER
52
REPAIR
Piston rings - check
CAUTION: Ensure that replacement piston
rings are the correct size for the pistons to
be fitted.
31. Lubricate cylinder bores and new piston rings
with engine oil.
32. Insert 1 set of piston rings in turn into No. 1
cylinder bore.
33. Check piston ring gaps using feeler gauges:
Piston ring gap - 1st, 2nd and oil control rings =
0.2 to 0.4 mm (0.008 to 0.020 in)
CAUTION: If ring gaps are too wide, it will
be necessary to rebore cylinder(s) to next
size and fit appropriate size pistons and
rings.
34. Suitably identify the piston rings with No.1
cylinder and retain with the piston and
connecting rod for that cylinder.
35. Repeat above procedures for remaining
cylinders.
36. Lubricate pistons and ring grooves with engine
oil.
37. Fit oil control, 2nd and 1st compression rings to
piston.
NOTE: 1st and 2nd rings are marked TOP.
38. Using feeler gauges, measure clearance
between piston ring groove and 2nd
compression and oil control rings.
Ring to groove clearance:
1st compression - not checked
2nd compression = 0.040 to 0.072 mm ( 0.002
to0.004 in)
Oil control = 0.030 to 0.065 mm (0.001 to 0.003
in)
39. Check that 1st compression ring is free to move
in groove.
40. Repeat above procedures for remaining pistons
and rings.