Connecting Rod Bushing

When connecting rod bushing is found tight in rod but is worn to excessive pin clearance (.002 in. or more) it is, of course, possible to repair it by reaming oversize and fitting an oversize pin. However, it is better practice to install a new bushing and ream it to fit a standard pin, except when piston to be used had previously been fitted with oversize pin or pin is loose in bosses, necessitating fitting with larger pin. The principal objection to fitting upper end oversize is that considerably more time is required for the job. New pistons obtained from factory are supplied correctly fitted with standard pin, and installing one is a short job if the rod bushing is already reamed to standard size. If bushing has been reamed oversize, either new bushing must be installed and reamed to standard size or piston must be reamed oversize to fit an oversize pin, which involves extra time.

When removing bushings in connection with only a top overhaul, use special tools as shown in Fig. 3C-24, Bushing Tool, Part No. 95970-32, and Connecting Rod Clamping Fixture, Part No. 95952-33. Be careful to start new bushings with oil slot in alignment with oil slot in rod.

Figure 3C-23. Installing Piston Rings
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