V8 Engine 35 39 42 | Overhaul Pistons - Refit
ENGINE
OVERHAUL
39
Cylinder liner bore - inspection
1. Measure cylinder bore wear in two axis 40 to
50 mm (1.5 to 1.9 in) from top of bore:
Cylinder bore diameter - standard:
3.5 litre = 88.86 to 88.90 mm (3.498 to 3.50 in)
3.9 litre = 94.00 to 94.04 mm (3.700 to 3.702
in)
4.2 litre = 94.00 to 94.04 mm (3.700 to 3.702
in)
Maximum ovality = 0.013 mm (0.0005 in)
2. Compare cylinder bore diameter with piston
diameter and calculate piston to cylinder bore
clearance.
Piston to cylinder bore clearance = 0.015 to
0.045 mm (0.001 to 0.002 in)
CAUTION: The temperature of piston and
cylinder block must be the same to ensure
accurate measurement.
CAUTION: DO NOT attempt to de-glaze
cylinder bores.
Pistons - refit
CAUTION: On later 4.2L engines the piston
has 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. 4.2L engine only: 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.