Missing Push Rods
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Missing Push Rods

  1. #1
    Sit N' Spin Jetaholic's Avatar
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    Default Missing Push Rods

    Was out on the delta Friday and my boat broke down. Started it up, idled fine, motor sounded great. Water temp was about 140* and oil pressure was up at 50psi. Swung it up gradually to 4,000RPM and heard a noise, and the motor instantly died. Got towed in by a friend and as he was towing me, I turned the key, the motor cranked over kinda weak sounding, then it locked up.

    On a hunch I pulled the valve covers off, and two of the pushrods are nowhere to be found! Somehow they came out and I'm assuming they ended up in the rotating assembly which is what is locking it up. I checked the oil and there's no water in it, so I doubt the pushrod ever punctured the cylinder walls. I haven't torn the motor apart yet.

    What could have caused this to happen?

    What are the chances of the rotating assembly being undamaged by the pushrod that is stuck in it?



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
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    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    steelcomp was here
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    Whatever it is, it's CStraub's fault.

    Sorry...couldn't resist. (Inside joke)

    This is always hard to diagnose without more info, especially over the internet so pictures would help, but something, for some reason let the pushrod out of the lifter. The lifter came out of the bore, and the pushrod went down through the lifter bore or through the lifter valley floor and disappeared. Yes, this is most likely what's causing the lock-up, but I'm more interested in why the pushrod left the lifter. What does the valve train look like? Any broken rockers or studs? Are any of the valves stuck open?
    Something let loose before the pushrod came out of the lifter. That's what you need fo figure out.
    If God is your co-pilot, change seats!
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    steelcomp was here
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    OK...I re-read this a little more carefully. The pushrods could be laying in the lifter valley (most likely are) and the lock-up is from something else coming apart that in turn caused a valve to hit something, probably bending the p/r and letting it fly. Still need to look at the valve train for valves stuck open on those cylinders. Sounds un-good.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Cas
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    Jon,
    As I mentioned on the phone, there is a possibility that the push rod guide wore a groove in 1 or more of the rods and at least 1 let loose. I know that one from experience. When mine let loose, it took out the retainer on the top of the lifter which put a bunch of little pieces in the valley. I also found part of the push rod in the valley and the other in the head.
    As steel said, there's a lot more info with pics needed to really figure out what happened and how.

  7. #5
    Sit N' Spin Jetaholic's Avatar
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    OK...I went out and pulled the intake manifold and discovered that the cam broke. It broke in 2 spots...right at the #8 exhaust lobe and also at the journal that seperates the 7/8 lobes from 5/6. Also some broken lifters were found. Here is a pic of one of them.



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    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

  8. #6
    Cas
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    ahhh, good ole #8 exhaust. When I was in the pricess of rebuilding my engine, there were a few people on Hot Boat that had issues with #8 as did I on the engine I was running. I asked a couple of different machinists about it and they said that there were some blocks where that particular lifter boare was tweaked a smidge. It was never really a problem in the cars as they didn't see 5K in rpms very often.
    In any case, when my block was done, all the lifter bores were addressed to help avoid problems in that area.
    My guess is now the #8 lifter stuck for a split second, tweaked the push rod then broke the lifter. From there, all hell broke loose inside with bits and pieces from the lifter. As I said, just a guess.
    Looks like a complete tear down is in the future.

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    JRPM/e-PerformanceMarine Squirtin Thunder's Avatar
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    I wanna see broken cam pics !
    Jim & Amanda Rich
    CJ 72 & 53c

    JR Performance Motorsports

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    I guess I got lucky a couple years ago. Going down the track I had an exhaust poli lock back off even with a girdle. When the push rod came out, that caused more pressure on the intake rod than it could take. That caused the intake rod to flex and come out of the cup and push on the folcrum. The rod then bent and opened the guide plate before it broke. I found the exhaust rod unhurt, the lifters, and half of the intake rod in the valley. I have screens over the return holes to keep junk in the valley. I had to replace the guide plate, intake rod and the valve.

    Tim

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Squirtin Thunder View Post
    I wanna see broken cam pics !
    I suspect you will in a few days.


    Looks like if the block survived that the lifter bores definitely need looked at closely on that alignment note.



    That really sux Jet.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    Senior Member Camoman's Avatar
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    Quote Originally Posted by Jetaholic View Post
    OK...I went out and pulled the intake manifold and discovered that the cam broke. It broke in 2 spots...right at the #8 exhaust lobe and also at the journal that seperates the 7/8 lobes from 5/6. Also some broken lifters were found. Here is a pic of one of them.



    Hey at least you can do is circle the problem
    There's doing it easy,or there's doing it better

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    058
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    Quote Originally Posted by Camoman View Post
    Hey at least you can do is circle the problem
    DAMNIT......You beat me to it.

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    Senior Member motormonkey's Avatar
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    Did you lose a rod into your cam? Ive seen solid cams break or rods smack cams and break them. Good luck.

  15. #13
    Cas
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    Quote Originally Posted by Camoman View Post
    Hey at least you can do is circle the problem
    Quote Originally Posted by 058 View Post
    DAMNIT......You beat me to it.
    Touché!

  16. #14
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by motormonkey View Post
    Did you lose a rod into your cam? Ive seen solid cams break or rods smack cams and break them. Good luck.
    Seen that one happen myself.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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