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trouble with rollor cam

 
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onefascar
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Joined: 28 Apr 2011
Posts: 2
Location: western md
180.02 points



PostPosted: Thu Apr 28, 2011 11:13 pm    Post subject: trouble with rollor cam Reply with quote

i just bought a 383 to set in my camaro i have a 69
don't know a whole lot about the motor other than it has set for awhile in a corvette but well maintained less than 50 miles on motor .
and it has a hydrolic rollor cam but when i got it and fired it up a couple of the lifters were ratteling so off with the valve covers and i went over all of them to zero lash then down 3/4 of a turn .( i adjust with motor running )
but it seems before i get done with both sides number 1 and 5 and 6 and 2 will start to slap like they either worked loose or lost their prime . it did have stud girdels on it but thought maybe they was suspect so i removed them and installed poly locks on the rockers but am getting the same results . is thier someone out there that has had a simulair problem with the rollor can as this is my first one .

thanks for any help or info and sorry for such a long post .

Scott
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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Fri Apr 29, 2011 12:44 am    Post subject: Reply with quote

probably just some bad lifters from sitting. if it were a flat tappet cam, i would say add some Marvel Mystery Oil and see if they pump up. i dont know if that is a good idea with the roller. too much lash tends to beat the hell out of roller cams.

welcome to SMOKEmUP Cheers

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onefascar
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Location: western md
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PostPosted: Fri Apr 29, 2011 8:08 pm    Post subject: Reply with quote

thanks 10sec i'm about to tear it down and see what is going on with the ole girl lol.

Scott
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Fri Apr 29, 2011 8:29 pm    Post subject: Reply with quote

I can't think what could be wrong with the lifters. I would think you should be able to take them apart and clean them with such short mileage. Just do one at a time as they may selectively assemble them and interchanging parts can be a problem. I've had to do it before when an engine ate the bearings up with about 20 miles on it Evil or Very Mad . Clay
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Skunkworkx
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Joined: 02 Sep 2007
Posts: 352
Location: Harford Co. Maryland
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1968 Chevrolet Camaro

PostPosted: Fri Apr 29, 2011 8:38 pm    Post subject: Reply with quote

Screw-in studs or press-in ?

Make sure they're all even across the top (studs) is a quick and easy check.

Also could be a bad batch or damaged due to installed wrong ?

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Paul P
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Joined: 15 Aug 2002
Posts: 2403
Location: Townsend, Mass.
81572.74 points


1971 Chevrolet Chevelle

PostPosted: Fri Apr 29, 2011 11:30 pm    Post subject: Reply with quote

If you can make it quiet temporarily with an adjustment then it has to be something up top. rocker, stud or adjuster.
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
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1972 Chevrolet Nova

PostPosted: Sat Apr 30, 2011 1:03 am    Post subject: Reply with quote

May sound silly but have you got good oil pressure?
Like Skunkworkx my first thought was that If you have pressed in studs you might be pulling them up. Back in the day we used to pin press in studs. Really archaic by todays standards.
You mentioned it sat for awhile. I don't think you would hurt it with some mystery oil. I know someone who uses trans fluid with good results. That kind of scares me but I'm not sharp in what you can get away with.
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