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I just completed 2.5L engine rebuild. The engine breakin went great, but I noticed a knock coming from the bell housing or the tranny when the engine is in neutral. When the clutch is depressed, the knock goes away. It's not random, but it doesn't really follow the RPMs. It's a definite knock...

It's stamped .020, which makes sense since they ground the crank. Also, clearance is within spec.

So, my clearances are all normal. I'm at a loss. Warped crankshaft? It was ground by the machinist. Bent rod? The rod bearing look good though. Hhmmm...

Well, it looks like excessive wear (for a brand new bearing) on my main bearings. Can someone tell me how this wear and the knock are related? Is this from clearance issues or something else? Thanks again for any feedback.

Well, good and bad news. The rod bearings look great (Pic below) - no obvious scoring and smooth surface on the crank. The bad news is that I don't know what's causing the knock. Is it possible that the endplay is causing the knocking? My endplay was just barely in spec when I built the engine -...

Thanks for the info. I have the oil pan off now and pulling the rod caps. So far everything looks really good - no noticeable up/down play in the rods. I'll update again once I have more info.

The machinist ground the crank and allegedly made sure the bearings/kit had appropriate clearance for the crankshaft. I even asked if I should plastigage, and he said I could if I want, but there was no reason. Since I did all the assembly, I assume there is no warranty on anything other than a...

I've been working on a 93 YJ project for my daughter. After doing body/paint and mechanical upgrades, I decided I wanted to rebuild the tired 2.5 L engine, which had low compression in cylinder 1 and some piston slap. It has been a pretty good experience, except for the premium I paid the...