SECTION F
Piston and Connecting Rods
To Remove Pistons and Connecting Rod Assemblies
1.
Remove the cylinder head (see Page E.1).
2.
Remove the lubricating oil sump.
3.
Turn the engine crankshaft until two big ends are at
bottom center then remove the nuts from the big
end bolts.
4.
Remove the big end caps, bearing shells and big
end bolts.
Note:
If the bearing shells removed are
serviceable, care must be taken to
refit them in their original positions.
Fig. F.1.
Removing a Big End Bearing Cap.
5.
Push pistons and connecting rods out of the top of
the cylinders (Refer Fig. F.2).
6.
Turn the engine crankshaft until the next two big
ends are at bottom center and repeat removal
operations.
Note:
Carbon deposits around the top of
the
cylinder
bores
should
be
removed before
Fig. F.2.
Removing Piston and Connecting Rod Assembly
from Cylinder Bore.
attempting to remove the pistons.
Keep each piston and connecting rod
assembly separate, each to each as
marked.
To Remove Pistons and Rings from Connecting
Rods
1.
Remove the three compression rings and the two
scraper rings from each piston.
2.
Remove tile circlips retaining the gudgeon pin.
using circlip pliers, and withdraw the gudgeon pin.
If the gudgeon pin is tight in the piston bore, warm
the piston in clean liquid to a temperature of
100/120F (40/50C) and the gudgeon pin will
then he easily pushed out.
Inspection
1.
Thoroughly clean all the dismantled components.
2.
Examine the pistons for scoring. Check the
clearance of the piston rings in their respective ring
grooves (see Technical Data).
