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Thread: Cam Issue

  1. 04-04-2007, 07:21 PM #1
    War Wagon
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    Cam Issue

    The block has been fully preped along with new cam bearings.
    We installed the cam tonight and when fully stabed in you can not turn it by hand. When you turn it with a wrench it will break free and start turning better. If you stop you have to use the wrench to start it turning again. Bearings were lubed with the cam break in lube. If you pull it out of the block to the groove in the front journal it will turn fine. Just for fun we installed the old cam and it turned fine by hand, now mind you this cam has 200,000+ miles on it. This is my first AMC build so not sure if this is right, myself I think not.

    Jim
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  2. 04-04-2007, 07:45 PM #2
    82Waggy
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    You should not use cam break in lube on the bearing journals. Use a good assembly lube instead, but not grease.

    Cam break in lube is for lapping the cam to the lifters.
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  3. 04-04-2007, 08:08 PM #3
    JERSEYJOE
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    tight cam

    I RAN ACCROSS THIS ON ONE OF MY 360 BUILDS. IT RAN FINE AND THERE WERE NO ISSUES.
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  4. 04-05-2007, 05:31 AM #4
    82Waggy
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    Re: tight cam

    Quote Originally Posted by JERSEYJOE
    I RAN ACCROSS THIS ON ONE OF MY 360 BUILDS. IT RAN FINE AND THERE WERE NO ISSUES.
    Depends on the type of lube, but I would not use a molly paste type cam lube on the bearings.

    I use Torco or Royal Purple assembly lube on bearings.
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  5. 04-05-2007, 08:48 AM #5
    War Wagon
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    We had redline assy. lube and cam lube as well.

    Jim
    78 Wagoneer-- The War Wagon 6" BJ's lift 33X9.5X15 BFG KO'S, Edelbrock performer carb & Intake, TFI,sway bar disconnects,Aussie Locker, Cliffhanger rear bumper

    The War Buggy - 360 W/GM TBI, comp cam, Edelbrock Performer,T18A, Klune, 205 twin stick, D60/14 bolt - 5:13 -Lincon locked, 42 TSL's, full Hydro steering, Tri 4 link rear W/ coil overs + more.

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  6. 04-05-2007, 09:03 AM #6
    tufcj
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    It's a min/max thing. The bearings are at their maximum tolerance (making the smallest hole) and so are the cam journals (making them the largest diameter).

    I had the same thing happen with my AMX 390. I thought I had a bearing in crooked, but they were all good, so I started measuring tolerances, and the cam was tight, about .001-.0015 on all journals. Mine was with a Crower cam. Probably a good thing, less bleed, so more oil to the main bearings. Hasn't been a problem so far.

    Bob
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  7. 04-05-2007, 09:36 AM #7
    82Waggy
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    Might also be worth checking cam length/end clearance against the cam bore plug at the rear.
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  8. 04-05-2007, 10:36 AM #8
    War Wagon
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    Thanks guys, we will check it out Friday, going to the track tonight for test and tune.

    Jim
    78 Wagoneer-- The War Wagon 6" BJ's lift 33X9.5X15 BFG KO'S, Edelbrock performer carb & Intake, TFI,sway bar disconnects,Aussie Locker, Cliffhanger rear bumper

    The War Buggy - 360 W/GM TBI, comp cam, Edelbrock Performer,T18A, Klune, 205 twin stick, D60/14 bolt - 5:13 -Lincon locked, 42 TSL's, full Hydro steering, Tri 4 link rear W/ coil overs + more.

    The Compost Heep - 82 Wagonneer, Camo Paint Job
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  9. 04-05-2007, 12:10 PM #9
    1980_Cj7
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    I thought the idea of having a specified clearance between the bearings and the journals was so there was room for a film of oil inbetween so that you don't end up with metal to metal contact and the resultant wear. In other words, tighter is not always better.
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  10. 04-06-2007, 12:50 AM #10
    luxi401
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    might also be a slightly bent camshaft....
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