Checking Piston to Cylinder Bore Clearance for V8 Engine Overhaul (35, 39, 42)
ENGINE
40
OVERHAUL
7. Locate connecting rod and piston to centre
screw with connecting rod entered on parallel
sleeve up to the machined groove on the
sleeve.
CAUTION: Ensure that the parallel sleeve
used is the same diameter as the gudgeon
pin.
8. Fit gudgeon pin on to centre screw and into
piston bore up to connecting rod.
9. Fit remover/replacer bush LRT-12-126/1 with
flanged end towards gudgeon pin.
10. Screw the stop nut on to the centre screw and
position piston against remover/replacer
adapter LRT-12-126/2.
CAUTION: Ensure that prongs of
LRT-12-126/2 remain in contact with piston
and do not contact the gudgeon pin.
11. Lock the stop nut securely with the lockscrew.
12. Lubricate centre screw threads and thrust race
with graphited oil, screw large nut up to
LRT-12-013.
13. Set torque wrench to 16 Nm (12 lbf.ft), and
using socket on large nut, pull gudgeon pin in
until flange of LRT-12-126/1 is distance ’A’
from face of piston.
Distance ’A’ = 0.4 mm (0.016 in).
CAUTION: If torque wrench ’breaks’
during above operation, fit of gudgeon pin
to connecting rod is not acceptable and
components must be replaced. The centre screw
and thrust race must be kept well lubricated
throughout operation.
14. Dismantle tool LRT-12-013 , remove piston,
check no damage has occurred during
pressing and piston moves freely on gudgeon
pin.
15. Repeat above operations for remaining
pistons.
Piston to cylinder bore clearance - checking
1. Starting with number 1 piston, invert piston and
with arrow on piston crown pointing towards
REAR of cylinder block, insert piston in cylinder
liner.
2. Position piston with bottom of skirt 30 mm (1.2
in) from top of cylinder block.
3. Using feeler gauges, measure and record
clearance between piston and left hand side of
cylinder block:
Piston to bore clearance = 0.15 to 0.045 mm
(0.001 to 0.002 in)
4. Repeat above procedures for remaining
pistons.