Rod Bearing (Big End Bearing)

This part sometimes corrode due to saltwater flooding and forgetting to winterise as instructed in the manual. also if the bearing rollers or cage is corroded, particularly pitted, then it is important to refit new.

this fits in the crankshaft, which is pressed together using 20 tonnes and precision alignement jig and expert technique to balance and true and retain con-rod end float.

although it is difficult to inspect without pressing apart, with the piston at TDC, you can see the edges of the bearing if they are discoloured/rusty, and also with the crankshaft and piston removed, spinning the con rod around you can hear wear noise or rumble within. I would also say that if you have more than 0.003" movement using a dial guage up/down relative to the crank, it is excessive play and likely worn.

please email me if you want your crankshaft rebuilt as i have the service.UK

please also inspect the following for wear/corrosion if this part is damaged:

• 52207 piston pin
• 52284/1 connecting rod, inner bore
• 52293/6 rod bearing (check play, noise and edges visible if not dissassembling)
• 52073 main ball bearing, should be smooth turned by hand no vibration.

Note. I do offer a specialist crankshaft rebuild service if you want to make sure your crank pin and bottom bearing 52293/6 are ok, please email me your concerns for a quotation.

also i offer rebuilt engine on exchange; short engine without piston or cylinder, full engine, also with gearbox and pump, also with silencer, also with carburettor and dynastart. if you cannot find these items in stock on the site, email me for a quotation.