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post #1 of (permalink) Old 08-24-2005, 02:22 PM
Warriorguy
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amc 360 cam problem

I have a 1981 Jeep CJ8 with a 360 v8.....I had it in the shop to replace the timing chain and water pump housing so I had them take out stock cam and install a Edlebrock off-road cam. Here is where the problems start..... When they put the cam in it ran fine for about 20 miles and then it bogged and ran like crap. Well they checked the cam and one of the lobes was warn down. Well we thought it just may have been a bad cam. So we ordered another cam and it did the same thing. Note......the shop i am using is a very reputatable shop and all the correct break in procedures were used and the cam was driven very easy when I picked up the Jeep. Anybody ever had this problem with cams if so what is causing the mishap. Help Help Help
Also I have another cam ordered but it is a stock cam
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post #2 of (permalink) Old 08-24-2005, 02:55 PM
 
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Re: amc 360 cam problem

So - Does following correct procedure to them mean replacing the lifters when inserting the new cam? I would start to suspect the vavle train, bad springs, bad lifter, bad pushrods, rocker arms out of alignment or misadjusted.
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post #3 of (permalink) Old 08-24-2005, 03:00 PM
Warriorguy
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Re: amc 360 cam problem

they have checked every aspect of that engine and everything looks fine......the engine has been rebuilt within the last 10k.
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post #4 of (permalink) Old 08-24-2005, 06:08 PM
 
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Re: amc 360 cam problem

Same lobe on the cam both times? Did you try and reuse lifters?

New cam means new lifters, all the time, every time...
No exceptions.
Not even if it only ran 20 minutes...
Break in pattern is a break in pattern, and you MUST use new lifters.

Did you 'Pump Up' lifters before using them?
Some lifters will 'Lock Up' if the Priming isn't done correctly (resulting it taking out a cam lobe or bending push rods).

Check for valve spring coil bind on the lobe that went, if it was the same one twice.

Use a preoiler and check the oil flow to every lifter bore.

Check lifter bore sizes, and oil flow around each lifter.
No oil on a new cam/lifter will take one out in about 20 minutes, when the moly assembly lube is worn off...

Break in should be done with petroleum oil, and switched to synthetic oil later. We have real problems getting things to break in using synthetic oil...

'Reputable' doesn't mean Competent... and everybody can have a brain fart...
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