brokenwrench
New member
i have a 71 1600 in rebuild. machine shop says my cam bearing journals are .002" over spec. is this ok, or do i need to replace my cams?
cmashaft wear
- Thread starter brokenwrench
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cmashaft wear
Is there a wear groove visible , do you have the makers original specifications , .002 thou may not be a lot, but if it results in lower oil delivery to the bearings?
What was their advice re changing, were they saying it was wear on the cams or the journals, I don't know about yours but do the cams run in the alloy cylinder head directly?
At the end of the day if machine shop advises changing them and is warranting/ guaranteeing their work, then unless cams replaced it may invalidate their warranty.
What was their advice re changing, were they saying it was wear on the cams or the journals, I don't know about yours but do the cams run in the alloy cylinder head directly?
At the end of the day if machine shop advises changing them and is warranting/ guaranteeing their work, then unless cams replaced it may invalidate their warranty.
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I refrained from commenting as again.. I needed more info
My sole experience
I bought a Fiat twin cam with a knocking big end
I stripped it out and took the crank to a machine shop.. They rang me the following day
Older cranks would accept 4 x regrind.. Mine would only accept 2,
and 2 wouldn't clean it up... So new crank!
So @brokenwrench is this a quote for restoring what you have..
Or is it already machined 'undersize'?
My sole experience
I bought a Fiat twin cam with a knocking big end
I stripped it out and took the crank to a machine shop.. They rang me the following day
Older cranks would accept 4 x regrind.. Mine would only accept 2,
and 2 wouldn't clean it up... So new crank!
So @brokenwrench is this a quote for restoring what you have..
Or is it already machined 'undersize'?
In this case I believe it's a camshaft issue, but like you @varesecrazy I had a machine shop tell me a crank on a 2.5 Sofim engine was scrap even though it was on standard bearings with one big end journal down to the copper, by the time I had got home they left a message saying miraculously they had located another complete crank and new shells for £250, needless to say in that case I declined their offer and they got no further business from my business!
Incidentally in some cases they can obtain even larger oversizes, many years ago I had a Morris Mini 1000 crank reground and give the guy his due he admitted he c*cked up and took the journal beyond +60 thou, he managed to obtain +80 thou shells and took the crank to that, I rebuilt the engine and it was fine.
Incidentally in some cases they can obtain even larger oversizes, many years ago I had a Morris Mini 1000 crank reground and give the guy his due he admitted he c*cked up and took the journal beyond +60 thou, he managed to obtain +80 thou shells and took the crank to that, I rebuilt the engine and it was fine.
