Illus 77 Measuring Piston Ring

Installing and Fitting Connecting Rod Upper Bushing

Connecting rod upper end bronze bushing may need to be renewed either due to wear and excessive pin clearance or due to becoming loose in rod. Inspect for both conditions.

When bushing is found tight in rod but is worn to excessive pin clearance (.002" or more) it is, of course, possible to service 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 reguired 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.

ROO CLAMPING FIXTURE PISTON PIN BUSHING TOOtW«?

ROO CLAMPING FIXTURE PISTON PIN BUSHING TOOtW«?

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