Engine: Rod bearings from my engine

[ChampCouple]

Removed the rod bearings from my engine. This is the engine I hope to do only a warm over. Any thoughts as to these bearings? I figure I should replace them, but not sure if they give clues to anything else. They all look about the same.



Thanks,
Mike

[62 Lark]

I would definitely replace them and plasi-gage to see what clearance you have. I would like to see .002 to .0025. Are they standard bearings now ? How are the main bearings ? I assume the engine is out of the car ? The problem is, if any are out of spec you are talking a reground crank with new rod and main bearings. For me, most engine refresh turns into a complete overhaul.

[PackardV8]

I would definitely replace them and plasi-gage to see what clearance you have. I would like to see .002 to .0025. Are they standard bearings now ? How are the main bearings ? I assume the engine is out of the car ? The problem is, if any are out of spec you are talking a reground crank with new rod and main bearings. For me, most engine refresh turns into a complete overhaul.

X2 - if you can see the copper plating, the crank usually has some wear also.

Having said that, with no more miles or hard use than hobby cars get these days, a patch job can suffice. But then there are the valves and the valve guides and the cam and the rocker shafts and yes, pretty soon it's an overhaul.

jack vines

[ChampCouple]

X2 - if you can see the copper plating, the crank usually has some wear also.

Having said that, with no more miles or hard use than hobby cars get these days, a patch job can suffice. But then there are the valves and the valve guides and the cam and the rocker shafts and yes, pretty soon it's an overhaul.

jack vines

I'm hoping to do just the minimum for this engine, as I have another engine I'd rather do a real overhaul on. If I can do enough to get 5000 miles I would be happy. But, I also don't want to do put it back together where it will wear faster than it should too. I don't believe the block has been bored out, so maybe a good block.

Thanks for the input.

[ChampCouple]

I would definitely replace them and plasi-gage to see what clearance you have. I would like to see .002 to .0025. Are they standard bearings now ? How are the main bearings ? I assume the engine is out of the car ? The problem is, if any are out of spec you are talking a reground crank with new rod and main bearings. For me, most engine refresh turns into a complete overhaul.

Thanks for the information. I believe they are standard bearings. I will have to look at the main bearings. The engine is out of the pickup.

The crankshaft where the rod bears are, running a finger nail across them, tiny grooves can be felt.

Thanks again.

[64studeavanti]

You could also mic the crank to see how worn it is. If those are standard bearings, .001 and/or .002 bearings may be available.

[62 Lark]

Good Morning, If you are feeling grooves with your fingernail there is wear on the crank. It's a lot of work to R&R an engine and then only replace the rod bearings. That said, your project, your budget. Not trying to be snarky.

[JoeHall]

The forward rod bearings (#1 and 2) will have the worst wear. Which number are the ones in your pic from? If from #7 and 8, I'd be worried. If #1 and 2, I'd polish the crank and install new bearings. Grooves in any crank with over 500 miles are not unusual; vertical grooves (running in line with rotation) that do not, "catch" the fingernail are OK, but horizontal grooves (that run across rotation) are a no-no. As for your goals and expectations of 5000 miles, you may be amazed at how long that motor will last!

[ChampCouple]

The forward rod bearings (#1 and 2) will have the worst wear. Which number are the ones in your pic from? If from #7 and 8, I'd be worried. If #1 and 2, I'd polish the crank and install new bearings. Grooves in any crank with over 500 miles are not unusual; vertical grooves (running in line with rotation) that do not, "catch" the fingernail are OK, but horizontal grooves (that run across rotation) are a no-no. As for your goals and expectations of 5000 miles, you may be amazed at how long that motor will last!

You are absolutely correct..... the above bearings were from number 1, # 2 was similar, by #7 and 8, bearings looked ok. Worn, but not like #1. Didn't feel any horizontal grooves.

Thanks.