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Thread: Camshaft wear.

  1. #1
    THE SE- RLOGIST
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    Default Camshaft wear.



    After a while dealing with these engines I have never seen something like this in a bone stock motor. What would cause this to happen? Let's bear in mind that I cleaned up before I took the pictures. There were metal shavings every were along with 1 chunk of metal 1 cm in size. That is the exhaust cam by the way.
    Last edited by Topdog781; 09-09-10 at 09:41 PM.
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    Jesus.... That's not good at all.

    Did you ever swap those in out out? If so... are you sure you followed the bolt down pattern in the FSM?
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    Maybe someone RTV'd the wrong spot there? They saw the groove and thought "Hey I'll RTV this!".

    That's an odd one...

  4. #4
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    Has to be lack of oil ... probably a plugged oil passage or just ran low on oil at one time ...
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  5. #5
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    Quote Originally Posted by SHAWNATGERBROCK View Post
    Has to be lack of oil ... probably a plugged oil passage or just ran low on oil at one time ...
    This is what I thought when I saw the pictures.

    Has to be lack of oil somewhere.

    What Ben said could be true, but he thinks of some crazy ideas from time to time.

  6. #6
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    yeah check to see if your oil squirters are clean. Everytime ive taken oil squirters off i find that at least 2 or 3 of the holes are not shooting enough oil
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  7. #7
    The Repair Man
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    oil tubes are gunked up. Lack of oil or foreign debris cause this type of damage.
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  8. #8
    The Repair Man
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    Also if the cams were torqued in the wrong sequence and too high you might have this problem.
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  9. #9
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    is this a engine you heard run, if so what did it sound like?S

  10. #10
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    def looks like lack of lube
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  11. #11
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    well if it was lack of lube you might see this but if it was lube then it might be more frequent in other areas of the cam also. was the cam properly lubed when installed if not this could also be a cause of this kind of oddish wear. not enough lube before installation then torquing it down could have prematurly worn this cam guide
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    Quote Originally Posted by Wayne View Post
    Jesus.... That's not good at all.

    Did you ever swap those in out out? If so... are you sure you followed the bolt down pattern in the FSM?
    I never touched the engine before.The previous owner may have. The car was all stock when I purchased it.
    Quote Originally Posted by SHAWNATGERBROCK View Post
    Has to be lack of oil ... probably a plugged oil passage or just ran low on oil at one time ...
    The car never runs low on oil. I make sure of that. I even keep a quart in the trunk sometimes.

    Quote Originally Posted by jen36 View Post
    yeah check to see if your oil squirters are clean. Everytime ive taken oil squirters off i find that at least 2 or 3 of the holes are not shooting enough oil
    I will recheck those but I am pretty sure they were clean.
    Quote Originally Posted by cortrim1 View Post
    oil tubes are gunked up. Lack of oil or foreign debris cause this type of damage.
    There was a actual chunk of metal under the cam cap. About a 1/4 big, it may have came from the cam though.
    Quote Originally Posted by cortrim1 View Post
    Also if the cams were torqued in the wrong sequence and too high you might have this problem.
    Possibly, I never touched the engine though.I did notice the cam cap bolts was not at the correct torque though. They were slightly looser than normal but tight.

    Quote Originally Posted by lynchfourtwenty View Post
    is this a engine you heard run, if so what did it sound like?S
    This engine was quiet as day. This is why I was in so much shock when I popped the valve cover.

    Quote Originally Posted by BenFenner View Post
    Maybe someone RTV'd the wrong spot there? They saw the groove and thought "Hey I'll RTV this!".

    That's an odd one...
    I don't understand ben?
    Last edited by Topdog781; 03-23-11 at 01:20 AM.
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    wow im amazed..

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    I don't know the history of the engine, so I think anything is up for grabs.

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    I have seen this happen to an sr18di motor. The cam cap in the middle of the cam shaft suffered oil starvation and the cam wore like this and then to the point of snapping and the non chain end that snapped off was nearly welded in place.

  16. #16
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    x (however many on the oil clog)

    last time i saw this, there was a piece of rtv stuck in the oil passage from the block to the head.

  17. #17
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    Quote Originally Posted by UI8281 View Post
    I have seen this happen to an sr18di motor. The cam cap in the middle of the cam shaft suffered oil starvation and the cam wore like this and then to the point of snapping and the non chain end that snapped off was nearly welded in place.
    Yes, that's what it looked like,the cam got welded to the journal. I will check those oil squirters today asap. The oil gallery in the journal was not completely blocked but there was some crap on top of it from the cam. I swear my new process every time I pop a valve cover will be to check those for now on.

    Quote Originally Posted by sqd View Post
    x (however many on the oil clog)

    last time i saw this, there was a piece of rtv stuck in the oil passage from the block to the head.
    Ben is that what you were talking about?
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  18. #18
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    No, but any oil blockage of any kind could have caused the issue like sqd said. I was just saying it's possible (maybe not likely?) that someone took that cam cap off and when re-applying it they put RTV in the wrong spot. The FSM says to seal the outside of that cap with RTV. Maybe someone got confused and sealed the entire thing causing RTV to squish into the cam bearing area or maybe they even filled up the entire oil groove with RTV by accident because it looks like an all the other grooves that you put RTV in. I know it's a long shot. You'd be able to tell if they sealed the entire thing once you took it off. You'd see RTV on all of the mating surface instead of just the outside. Now that I look at the pics I don't see any, but maybe there is some?

    It probably happened because of a simple oil blockage like others have said, or the over-tightening of that cap, or a combination of the two.
    Last edited by BenFenner; 09-10-10 at 11:04 AM.

 

 

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