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Posted by bobc [Email] (#473) [Profile/Gallery] (more from bobc) on Sun, 2 Aug 2020 10:51:39 Share Post by Email
In Reply to: main bearings in situ? how?, bobc [Profile/Gallery] , Fri, 31 Jul 2020 21:38:26
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So we decided to button it up without changing the main bearings. We will revisit in a few weeks at which time we intend to:
- reeplace the main bearings
- cut the balance chain.

Results: results: much quieter at idle, almost normal sounding! A huge improvement over the first videos I posted. However a test drive revealed a slow deep knock on acceleration only. originally there was a LOT of noise coming from this engine at idle, and under load. Replacing the head improved matters. And now with fresh con rod bearing the noise is greatly reduced. I think that with the other noises quieted I can hear this one remaining sound more clearly.

It is a slow, rythmic and deep sound. It is not obviously coming from the bottom end, though this could be my inexperienced ear mis-reading it. It appears under load, and immediately disappears as I let off the gas. It's quiet when cruising at steady state. it does not diminish as the car warms up.

I think this is a classic symptom of the main bearings? Is that correct ? Piston slap and/or wrist pin bearing is still a concern of course. But the symptoms, to me, suggest the main bearings. And it certainly fits given the sad state of the con rod bearings,

I think that doing the main bearings is a reasonable next move. But if the symptom is clearly pointing to pistons, we will do that. My back would be happy if we can leave the pistons in place for now :-) but I want to do what makes sense. 
_______________________________________
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