Vibration
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Vibration

  1. #1
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    Default Vibration

    Search function has been used and most possible remedies have been ruled out as a result.

    Alright boys I'm lost, I've got a vibration from just over idle all the way to I assume redline (don't have the gumption to find out) I've ruled out the driveline and pump. Damper is balanced with weight 180 off TDC, flywheel has weight, removed alt. Belt, even ground extra material off mounting feet to ensure no contact with the floor. It runs great, no misfire, solid compression with less than 10% difference across the board, new plug wires installed yesterday. Engine came out of a running boat with no vibration. What am I missing??

    Engine is a .060 over 454 externally balanced 2 bolt crank.
    Last edited by Mr.goslo; 07-23-2016 at 06:46 PM.

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    Senior Member ol guy's Avatar
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    How have you ruled out pump? Have you fired the boat with the pump dissconected? If you were running in elsinore the water has gotten so low you may have picked up something off the bottom. First thing I would do is unhook the pump and run the engine thru the rpm range and see if the vibration goes away. If not I would look deep into the pump and also pull the hand- hole cover for something stuck in the impeller. I have been thu this and know how it feels. It will shake the boat bad but un-hook first to eliminate that possibility. good luck! Mark

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    Quote Originally Posted by ol guy View Post
    How have you ruled out pump? Have you fired the boat with the pump dissconected? If you were running in elsinore the water has gotten so low you may have picked up something off the bottom. First thing I would do is unhook the pump and run the engine thru the rpm range and see if the vibration goes away. If not I would look deep into the pump and also pull the hand- hole cover for something stuck in the impeller. I have been thu this and know how it feels. It will shake the boat bad but un-hook first to eliminate that possibility. good luck! Mark
    Pump is disconnected, running on trailer. It's not a bad, rattle the fillings out of your teeth vibration. It's more of a your girlfriend wants to ride in it vibration.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by Mr.goslo View Post
    Pump is disconnected, running on trailer. It's not a bad, rattle the fillings out of your teeth vibration. It's more of a your girlfriend wants to ride in it vibration.
    I love the reply!!! But still not good. At this point I would check and see if the damper ring didn't spin on the crank shaft. In other words the damper fits tight on the end of the crankshaft but the outer ring is fitted with a rubber ring and they have been known to spin and put the engine out of balance. Put the engine up to tdc #1 and check were the timing mark is. Also make sure you didn't knock a balance weight of the flywheel, if you are running a flex plate. Mark P.S if you go out again and you see the girlfriend with her eyes rolled back in her head---DON'T STOP--
    Last edited by ol guy; 07-23-2016 at 08:33 PM. Reason: add on

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    Senior Member andyc's Avatar
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    Default flex plate...make sure you have ....

    Make sure that flexplate is for a 454 MK 4 if that is what you have, different for a Gen 5-454...Both are externally balanced but there is a difference. Just my .02!! Good luck.

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    Senior Member ol guy's Avatar
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    one more question. has this problem been since day one or did it just pop up. This could help for helping to diagnose the issue. M

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    Senior Member andyc's Avatar
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    Default "Engine came out of a running boat with no vibration"

    HMMMM??? So did it come with flexplate or ???

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    Quote Originally Posted by ol guy View Post
    one more question. has this problem been since day one or did it just pop up. This could help for helping to diagnose the issue. M
    I bought the boat as a project, I'm told by the PO that it did not have a vibration in the last boat. (I didn't purchase directly through him so don't see any reason for him to BS me, but anything is possible) Nothing was changed, other than the headers on the engine. I'm going to throw a new damper on it Thursday and see what I come up with.

    Quote Originally Posted by andyc View Post
    HMMMM??? So did it come with flexplate or ???
    Engine has a flywheel installed, it has not been changed.
    Last edited by Mr.goslo; 07-26-2016 at 03:44 PM.

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    Senior Member ol guy's Avatar
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    Just my thought. Before you throw money at a new damper have you checked the one on the engine.? Also do know if the engine is internally balanced or external. Things to check prior to throwing more money at it. Mark

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    Quote Originally Posted by ol guy View Post
    Just my thought. Before you throw money at a new damper have you checked the one on the engine.? Also do know if the engine is internally balanced or external. Things to check prior to throwing more money at it. Mark
    I checked the current damper and it appears to be 8-10* off TDC from the timing mark, I'd also like to get it off to check the keyway just in case. As far as balance I have no reason to believe it would have an internally balanced crank in it, '76 truck block, truck heads, stock rockers, rv cam...

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    Senior Member jetboatperformance's Avatar
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    If the engine is "factory balance" and it has the correct application flex plate/flywheel and dampner combo there no reason for vibration period unless is lost heavy metal (mallory) in the crank (unlikley) probably not telling you anything new... If you have "eye blurring" vibration while running above idle AND your drive line is disconnected you have a engine balance problem pure and simple ... and for the record when a dampner out ring turns it really only affects timing refernce the counter weights on 454 are cast in although some units may have drill marks in the outer ring here and there they would not likley cause the condition like a "dog pooping peach pits"

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