Comp Cams Pro Magnum Roller Rocker issue
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Comp Cams Pro Magnum Roller Rocker issue

  1. #1
    V-Drive 4 ever
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    Default Comp Cams Pro Magnum Roller Rocker issue

    just currious if anyone else has had a problem with Comp Cams Pro Magnum roller rockers before . my engine has about 8-9 trips out on it so far with maybe 8-10 hrs on it total . motor has never hick-up'd or had any problems before ever . then yesterday at CFW after making a few adjustment tests on the hull . moving motor forward and adj. cav plates .. while checking out how it rode i noticed a slight mis in the engine and within 10 seconds later a pop pop and the motor lost power . i thought i might have had an ignition failure but the popping thru the carb led me to pull tha valve covers and find the rocker arm in this shape in the pic below ... motor is a chevy 454 solid roller cam with a big lift . after talking to an engine builder he seems to think the bearing in the rocker arm on the shaft wasnt getting oiled enough and siezed up . just currious if anyone has run into this before or what . i went with comp cams rockers cause i have heard nothing but good about them .. anyone have any input on this? this happen at around 5000rpm . was running it Hard last week pulling into the 7000rpm range and engine never once showed a sign of a failure bout to happen . this happen when i was babying the motor giving someone a ride . ... was no signs of damage to anything else in the motor . valve seems fine (havent pulled head) lash cap shows alil wear due to this happening and push rod is in perfect shape still.. so im wondering put a new rocker on fish the pieces out of oil pan and run it again or what??


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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    i'd wanna take a look at that lifter too if it were me and take a new look thru the pushrod

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    Distinguished Member David 519's Avatar
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    Bummer man, that looks bad. I like Comp Cams stuff and never had any issues with any of it. I'd make sure everything in the valve train is right, especially cam timing. Many years ago, back when we degreed cams using bushings, I had a bushing come out of the timing gear. This let the cam timing slip until the exhaust valves hit the pistons, causing a few push rods to bend, drop into the engine and make a bit of a mess. If you're running a big cam, wouldn't take much for it to hit.
    However you mentioned you thought the bearing seized. This seems a bit odd since it doesn't take much oil to lubricate the bearing (it doesn't spin really). I'd talk to Comp Cams, although their tech support isn't what it used to be.
    Do let us know what you finally find out....

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    Comp has had some problems that they dont talk about, had one break same way on the dyno, get a hold of them and they will take the whole set back. If you look at your other Rockers they probably look fine no signs of heat. replace the roller lifter and the push rod even if they look goodon that cylinder.

  6. #5
    Senior Member hotbo's Avatar
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    youll get alot of peeps these days say comp stuff is not what it use to be,well wtf is

    i to have had great luck with anything comp we have used there cams,rockers,pushrods,ect.just looks like bad luck to me call comp talk to them and look over what tom said lifter pushrods,so forth.good luck

  7. #6
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    well the side that still has part of the sleeve still parcially wraped around the pin is the side that got hot and siezed the side thats Broken off and missing was caused from the other side siezing and stressed the broken side out making it break .. i do plan on pulling the intake and digging alil deeper i want to try and retrieve as much of the broken pieces as i can and use a hi power magnet on the pan to try and move the pieces in pan to the oil drain. the wear on the roller tip kinda looks like it has been stressed before and was riding on the edge of the wheel . but geometry wasnt off on the exhuast valve on same cyl and rest all looked fine . motor builder seems to think the bearing failed .. and said he has a motor in same shape in the back with about same amout of run time as mine .. will know more later this week once i get replacement parts and motor torn down alil deeper .. after i posted this more of you rang in . thanks for the advice guys .. i can not afford a motor failure cause of something stoopid like this . i lose a motor it prolly take me another year to afford to build one so thanks for advice guys .. im gonna call comp in the moringing and see what they say
    Last edited by Billdoe; 04-28-2008 at 08:16 PM.

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    Also a week after ours broke on the Dyno I had another engine builder stop by the shop to show me a rocker arm he had, broke it was Identical to ours and nothing else was wrong, thats when we called comp and they wanted the whole set returned no questions asked. And by the way they didnt have any Rocker Arms In Stock to Replace them other than there new Comp Gold Series. The rest were pulled untill they find out how many defects were out there.

  9. #8
    Rollin With Fink fasterthanu's Avatar
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    Quote Originally Posted by Billdoe View Post
    well the side that still has part of the sleeve still parcially wraped around the pin is the side that got hot and siezed the side thats Broken off and missing was caused from the other side siezing and stressed the broken side out making it break .. i do plan on pulling the intake and digging alil deeper i want to try and retrieve as much of the broken pieces as i can and use a hi power magnet on the pan to try and move the pieces in pan to the oil drain. the wear on the roller tip kinda looks like it has been stressed before and was riding on the edge of the wheel . but geometry wasnt off on the exhuast valve on same cyl and rest all looked fine . motor builder seems to think the bearing failed .. and said he has a motor in same shape in the back with about same amout of run time as mine .. will know more later this week once i get replacement parts and motor torn down alil deeper .. after i posted this more of you rang in . thanks for the advice guys .. i can not afford a motor failure cause of something stoopid like this . i lose a motor it prolly take me another year to afford to build one so thanks for advice guys .. im gonna call comp in the moringing and see what they say
    Hey how old are those rockers? I see 8 or 9 hours is that total on new rockers as well. Just trying to get an idea how old they are physically and also run time. Thanks

  10. #9
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    bought new last april and maybe 8-9 boat trips on them with maybe 8-10 hrs of run time so basically new rockers .. thanks BlownJet13 for the info .
    Last edited by Billdoe; 04-28-2008 at 08:49 PM.

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    I was made aware of there issue by my engine builder. He said so far the Hi-Tech line has been much better with no failures yet. The Pro Magnums have been breaking but like mentioned above Comp has been taking care of it (hush,hush)

  12. #11
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Blue View Post
    I was made aware of there issue by my engine builder. He said so far the Hi-Tech line has been much better with no failures yet. The Pro Magnums have been breaking but like mentioned above Comp has been taking care of it (hush,hush)
    smokinlowrider will be here in a bit to tell ya why the pro mags are the shiat i'll keep runnin my crane golds, they've never let me down they's some big biatches, but them big biatches ain't gonna break either

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    I buy several thousand dollars worth of Comps products every month and the only reason I still do is because they took care of me when there was a problem.But Iwill not buy another Pro Magnum untill somebody admits to ,and tells me the problem is fixed, and why it happened in the first place. untill then I will be using the more expensive Crowers.

  14. #13
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    im glad i posted this . i feel more relaxed as to what happen .. juss currious BlownJet13 . you send the set of rockers back they give you a new set or a refund / credit what they do for you???? . i dont have a problem sending them back and i Will not use this style again . while i was at the shop today having the engine checked the builder looked at the rockers and was wondering if they normally have side to side movement and i dont mean slideing on the pin back and forth was more of a pivoting movement like there was slop in the pins on some of the others with no pressure on them .. i think i will order the gold series of rockers crane makes so i at least be on the lake this weekend .

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    Quote Originally Posted by IMPATIENT 1 View Post
    smokinlowrider will be here in a bit to tell ya why the pro mags are the shiat i'll keep runnin my crane golds, they've never let me down they's some big biatches, but them big biatches ain't gonna break either

    Been doing this along time and crane golds use to be all we used,
    had one break once Rocker was laying inside valve cover bearing broke and couldnt find needle bearings up top so had to pull motor apart to retreave them only to find out there wasnt any in the rocker in the first place. Found 3 others the same way. the differnce is had to fight like hell with crane, and never used them since. that was in 1997 customer support is Important. Not saying there bad, just every body has problems its how you handle them that keeps your customers, Yours.

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