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One Tight Big End Bearing

Started by Moshtaraq , Apr 07 2020 10:29 AM

Best Answer Rorf , 07 April 2020 - 11:32 AM

That is why it is so critical to do a trial build without the piston rings in place, so if one piston and rod tightens proceedings up you can swop them around to see if the problem moves with that particular rod or it might be the journal.

It could even be a bent rod.

The other reason for doing a trial build is to check whether the block might need decking to get the pistons flush with the deck.

Remove the rings and do a trial build.

Some builders call it a dry build, to ensure no tight spots when turning the crank.

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20 replies to this topic

#16 timmy850

Up Into Fourth

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3,329 posts

Location: NSW, Australia
Local Club: MITG

Posted 07 April 2020 - 10:31 PM

What do you mean by piston and rod? The pin in little end?

The rods are offset, if it’s around the wrong way it’ll bind up

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#17 Moshtaraq

Stage One Kit Fitted

Noobies
86 posts

Location: Antwerp

Posted 07 April 2020 - 10:54 PM

No it's on the right way ?

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#18 Spider

Moved Into The Garage

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Location: NSW
Local Club: South Australian Moke Club

Posted 08 April 2020 - 06:03 AM

It's likely cold comfort or news you don't want, but Rods do need to be reconditioned as just one part of the engine reconditioning process. Personally, I wouldn't remotely consider trying to assemble an engine in which there weren't done.

This was covered recently in this thread;-

http://www.theminifo...izing-big-ends/