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Piston rings rb20det

A31cefiroNZ

By A31cefiroNZ,
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A31cefiroNZ

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1 minute ago, GTSBoy said:

Can you take a photo without the potato lens on? Can you feel any features (larger than the honing marks) with your fingernail? The vertical scoring? The apparent scuffing/deposition of material in a band about 1/2-2/3 a bore diameter down the hole?

If you tap on photo it should make photo clearer, has a score mark on number 5 guessing the rings have failed, a little bit towards the top of cylinders on all but nothing extreme, and no scorch marks on the others, cheers

tridentt150v Grand Master

tridentt150v

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The third photo down looks....like to me like the cylinder had water in it and it sat for a while  That would create a rust ring.  This would have been removed when the motor was used but would have left a cavity around the bore at the water mark  where the rust ring was.

You also have a vertical scour mark, this could be a snapped/badly gapped ring or gudgeon pin/circlip issue....you won't know till you pull it apart.

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A31cefiroNZ Contributor

A31cefiroNZ

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13 minutes ago, Ben C34 said:

Why take the head off the hard way?

Engine is f**ked, engine out.

Mean when you get told engine is "rebuilt" "under 5000km" and you drive it round maybe 400km at most n it f**ks its bloody great, cam bearing cap had nuts snapped into the head, guess lots of shortcuts taken in a backyard with it, not really on when go to buy a car yet keep finding more things, harmonic balancer is totaled (will attach photo) mate it's awesome 👍🫠, have known all this from get go would've brought a v8 commodore

20230620_144012.jpg

Edited by A31cefiroNZ
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