7. Remove each connecting rod's cap nuts (A,
Figure 128), the cap and the rod. Keep each cap
with its original rod, with the weight mark on
the end ofthe cap matching the mark on the rod
.dfter removing the rod caps, remove the
rods careful1.v to keep the rod srudsfrom
scratching the crankshaft journals.
Keep each bearing insert in its original
place in the crankcase, rod or rod cap. I f
you are going to assemble the engine
with the original inserts, they must be
installed exactly as removed in order to
prevent rapid wear.
1. Clean the crankshaft oil holes with pipe
cleaners (Figure 129); flush them thoroughly
and dry. Lightly oil all bearing journals
immediately to prevent rust.
2. Carefully inspect all the main bearing and
connecting rod bearing journals for scratches,
ridges, scoring, nicks, etc. Very small nicks and
scratches may be removed with fine emery
cloth. More serious damage must be removed
by grinding-a job for a machine shop.
3. If these checks are satisfactory, take the
crankshaft and connecting rod assembly to
your dealer or local machine shop. They can
check connecting rod bend and twist and
crankshaft runout and inspect the parts for
cracks. Check against the measurements given
in Table 1 at the end of this chapter.
When obtaining new connecting rods,
tnakeszrreeach pair (No.
and No. 2, or
has the same weight
mark stamped on the side ofthe big end
(B, Figure 128).
4. Check all the main bearing and connecting
rod big-end clearances as described in the
Main Bearing Clearance Measurement
To check crankshaft journal/bearing
clearance with Plastigage, the crankshaft must
be installed with the journals and inserts dry. It
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