I am rebuilding three of these and decided to buy new manifold gaskets. They are like $80 but a leak would be really bad thing to deal with. If yours was just recently put in and you can separate the manifold without tearing it up, I wouldnt hesitate to re-use. All the ones I've torn down had manifold gaskets which were in awful shape. I've re-used copper head gaskets numerous times with no problems, but these manifold gaskets with the copper sealing rings are a different story.
Good luck with your rebuild.
I am rebuilding three of these and decided to buy new manifold gaskets. They are like $80 but a leak would be really bad thing to deal with. If yours was just recently put in and you can separate the manifold without tearing it up, I wouldnt hesitate to re-use. All the ones I've torn down had manifold gaskets which were in awful shape. I've re-used copper head gaskets numerous times with no problems, but these manifold gaskets with the copper sealing rings are a different story.
Good luck with your rebuild.
[quote="Oldcarman"]I am rebuilding three of these and decided to buy new manifold gaskets. They are like $80 but a leak would be really bad thing to deal with. If yours was just recently put in and you can separate the manifold without tearing it up, I wouldnt hesitate to re-use. All the ones I've torn down had manifold gaskets which were in awful shape. I've re-used copper head gaskets numerous times with no problems, but these manifold gaskets with the copper sealing rings are a different story.
Good luck with your rebuild.[/quote]
I found I main bearing for 26.00 but the other had to come from CAT .020 over at $120.00. Now that it is ordered, I am thinking .030 over are probable more available and just finish it to .020 on the lathe. What do you do about main bearings? PS the manifold gasket came off in perfect shape.
I'm making my main bearings on my lathe from 6061. Others have done the same with good success. I've done a couple and seem to work fine. Takes me a long time as I really creep up on the diameter slowly.
Rod bearings are a bigger challenge to find, but they are out there if you hunt. Are you pretty sure that your crankshaft and rod clearances are OK? The dimensions Cat gives as acceptable are crazy sloppy IMHO and maybe thats one reason that they seem to chuck rods. Lots of clearance and oil diluted with gasoline makes it hard to build an oil film for the journal... and then the parts fly.
I thought about cutting that manifold gasket, but the copper rings and pretty wide bolt spacing gave me cold feet on that. I've dealt with "water in the basement" on lots of old engines and didn't want to invite a problem. I cringe to fork out that much for a gasket, but I don't think a hand cut gasket would be reliable.
BTW, my new Cat gaskets do have the slots for oil drain.
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