Engine Overhaul Manual v8 40 46: Pistons Refit Procedure
ENGINE
36
OVERHAUL
Pistons - refit
CAUTION: Pistons have a 0.5 mm (0.02 in)
offset gudgeon pin which can be identified
by an arrow mark on the piston crown.
This arrow MUST always point to the front of the
engine.
1. Assemble pistons to connecting rods with
arrow on piston pointing towards domed
shaped bosses on connecting rod for RH bank
of cylinders, and arrow pointing away from
dome shaped bosses for LH bank of cylinders.
2. Clamp hexagon body of LRT-12-013 in vice.
3. Screw large nut back until flush with end of
centre screw.
4. Locate remover/replacer adapter
LRT-12-126/2 with its long spigot inside bore
of hexagon body.
5. Fit parallel sleeve, part of tool LRT-12-013 with
grooved end towards open end of LRT-12-013
up to shoulder of centre screw.
6. Lubricate gudgeon pin and bores of connecting
rod and piston with graphited oil.
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.