CONNECTING RODS, PISTONS, RINGS & SLEEVES
If the measurements are not within the
specified limits, and the torque wrench is
known to be accurate, remove the bearing
from the connecting rod and replace it with
a new bearing.
NOTE: With the precision bearings used, no
problem should be encountered, providing the
crankshaft and connecting rod are in good order.
Check connecting rod end clearance, using
a feeler gauge as shown in (Fig. 13) maximum
permissible bearing end clearance on crankshaft
is 0.46 mm (0.018 in.).
The feeler gauge MUST cover both the
connecting rod and cap (Fig. 13).
Figure 13. - Checking Connecting Rod End
replacement of the rods or shaft.
The check MUST be made to be certain
that the specified clearance exits.
damaged rod or perhaps a rod bearing out
Clean Pistons as follows:
Soak the piston and piston pin in soap
solution (until carbon is soft) and clean
thoroughly. NEVER USE A CAUSTIC
Clean all carbon from the piston ring
grooves; using a nonmetallic brush. Be
sure all oil holes in the piston are open.
Inspect Pistons as follows:
Visually inspect the pistons for scuffed or
scored skirts and cracked or worn piston
ring lands. Replace the piston if necessary.
Check running clearance between the
piston and cylinder sleeve (with piston rings
removed) for piston skirt wear. Measure at
the largest piston diameter. If running
clearance exceeds 0.165 mm (0.0065 in.)
replace the piston.
Visually inspect the piston pins for wear.
Replace any pins which show signs of
corrosion or etching.
Inspect Piston Rings as follows:
Visually inspect NEW rings for any signs of damage
prior to installation.
NOTE: Faulty rings cannot always be detected by
the eye. Therefore, whenever a piston is removed
from a cylinder, it is recommended that the piston
rings be rep-laced.
Prior to installing the rings on the pistons,
check each ring for proper ring gap as
Push the ring down into a new cylinder
sleeve with a piston. (This will position the ring
squarely in the sleeve).
Measure the gap between the ends of the
ring with a feeler gauge as shown in (Fig. 14). If
ring gap does not meet the specifications
outlined in this section replace the ring.
PRINTED IN UNITED STATES OF AMERICA