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Sorting valvetrain issue

  1. #1
    Member hollbrow's Avatar
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    Default Sorting valvetrain issue

    How difficult is it to mechanically 'hurt' a hydraulic lifter? Would cranking it over with stuck valves from sitting up physically hurt a lifter- like collapse it or overstress it, or make it stick? I cranked my engine with a few sticky valves and came up with some extra valve lash- enough to make a bunch of tapping and racket and make me shut it down. I thought my cam was toast, but I can look through the drainback holes in the heads and fish the lifters out with a magnet and the cam lobes I can see and the bottom of the lifters look great. It's a Comp Cams 280AH hydraulic flat tappet with Comp Cams Pro Magnum CC-858 lifters. I used the K-Kit with all matched components and I have 7/16" pushrods, and Comp Pro Magnum 1.7 full roller rockers. After all this, I very carefully reset the lifter preload to zero + 1/8 turn per Comp's instructions and I am getting valvetrain noise like it never had before- so much I'm scared to run it. I did a leakdown and the worst cylinder was 8%- I have removed the springs and seals and used penetrating oil to work the valves loose and verified that the valves are not sticking any more. All the pushrods are still straight and my valvetrain geometry is pretty decent. Based on the leakdown, I don't think any valves are bent. I changed the oil when I started messing with a it a few months ago- I know I ought to pull it all down and go through it- just don't have the money right now. Any suggestions of stuff to check/do before pulling it down and replacing cam/lifters and properly checking guide clearance?

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    You could try readjusting the valves. you most lickly did not hurt the lifter.

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    Member hollbrow's Avatar
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    Default adjusted valves...

    Yes, I have- multiple times- as I thought if I ran it a bit, it may free on up. Definately better than it was, but very noisy with a tapping that sounds as if it has a very loose couple of rockers- but when I check it, it is right where I left it. I'm going through and using EOIC and am fairly certain I am setting the lifter preload on the heel of the cam lobe.
    I actually pulled some lifters out through the drainback holes and verified by CC part # on them and looked up the Comp Cams recommendations for setting them- and it says use 0 to 1/4 turn max for that pro magnum lifter. It is an anti-pump up design. I also wonder if things could be gummed up- this engine has very low hours on it- hardly broken in- but it has sat up for YEARs. (I got married, moved, took a different job, and had two kids) I have done good to hold onto the boat through it all. yes dear...

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    Member hollbrow's Avatar
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    Default guess I posted

    On the wrong day...

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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by hollbrow View Post
    On the wrong day...
    More like the wrong section...put it in the dunk section, and try to remember that patience is your friend.
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by hollbrow View Post
    After all this, I very carefully reset the lifter preload to zero + 1/8 turn per Comp's instructions and I am getting valvetrain noise like it never had before- so much I'm scared to run it.

    Any suggestions of stuff to check/do before pulling it down and replacing cam/lifters and properly checking guide clearance?
    Are you sure about that 1/8th turn spec? Without going to check on their site, I would expect to go zero lash plus about 5/8 of a turn on a hydraulic flat tappet. If you don't have preload on the lifters, of course it will be noisy.

  9. #7
    Member hollbrow's Avatar
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    Default preload-

    Yes, that is the correct preload for this 858 "pro magnum" lifter according to CC website. I also set them to around 1/2 turn from zero to see if that quietened it down, but it didn't. It had been years since I originally turned the wrenches on it, so I pulled a few lifters and got the numbers off of them- to verify what I had-and looked it up. I'm sure I originally set them to whatever their instructions said that came with the lifters, and had no valvetrain noise to speak off before the stuck valve deal. Was looking at a chance to put it in the water tommorow, but decided not to risk problems on the river til I get a handle on it. Looks like its gonna take a teardown.

  10. #8
    Member hollbrow's Avatar
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    Default what is...

    The dunk section?

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    Senior Member DuaneHTP's Avatar
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    Default Lifter issues

    I have had very good results in the past using this product for exactly the situation you are in. It would be worth a try before a tear down. It is Product # 105 on the followiing page.
    BG Products, Inc.

    Duane HTP

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    Senior Member lbhsbz's Avatar
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    I would be more concerned with why the valves were stuck to begin with that I would be with what I might have hurt.

    Were the guides gummed up with oil coke from excessive heat? Are the guide clearances inadequate? Valves a little bent? If they weren't bent, they might be now. Cam and lifters are cheap.....if a valve sticks again while the engine is running....it won't be cheap.

    As far as lifter preload.....I use a half turn and that has suited me well over the years. 1/8 turn seems like not enough.
    GN7: "If you were to have ever had two brain cells you could rub together and make heat, you be dangerous"

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    I would set them at half turn. They are going to be a bit noisy with an anti pump up lifter. more at an idle then higher in the revs.

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    When doing the valve adjust push on the rockers and see if the lifter is actually pumping up. Have seen the check balls hang up, not allowing lifter to pump up. Do the rockers all get a full swing when cranking over? This is a quick way to verify if the cam has a lobe going flat. When it is running, is it missing? A quick leak down test should verify if a valve was bent. Should be able to figure out without a tear down just have to do some investigating to figure out. Let us know what you find.

  15. #13
    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by hollbrow View Post
    The dunk section?
    Hahahahaha, sorry(damn phone) Dyno section.
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

  16. #14
    Member hollbrow's Avatar
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    Default issues...

    I had done the leakdown before I posted- worst cylinder was 7-8%. I'm leaning towards stuck/gummed up lifter internals. I may try the stuff recommended. I changed the oil, but havent tried atf or flushing it yet. If that doesnt work, then gonna do the new cam & lifter kit.

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