new clunking issue
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new clunking issue

  1. #1
    Member CashLeak's Avatar
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    Default new clunking issue

    Ive been tinkering with my boat trying to get it running right. (Timing and Carb ajustments) Ive had it hooked to the hose on low with the ball valve as a shut off. I haven't been reving it over 2000 rpm and maybe have 10 to 15 min of running it on the trailer mostly at a idle. Now im hearing some clunking as it runs . Im trying to narrow down where im hearing it come from. It sounds like its coming from the pump or the flappers in the risers but its hard to narrow it down with all the engine noise. Ive greased the pump shaft but I cant find any grease fittings on the U joint . I know everyone says to unhook the drive line when running it on the trailer but I cant find anyway to acsess the bolts on the bell housing . Anyone have any ideas on the clunking ?????? Could it be from running the pump out of the water . Ive had a lot of good advise from this forum but im still always learning. Im running a stock marine BBC with a Berkley JG pump

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Kinda need to seperate the motor from the pump if its that hard to distinguish location.itll allow you to check the ujoints and pump bearing.only suggestion i have is to take the driveshaft loose bud.

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    gn7
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    Member CashLeak's Avatar
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    No I have water flowing into the pump

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    the spline on the pump shaft is rocking back against the spline in the drive shaft . is it aluminum impeller or stainless? if its stainless it will be louder since its heavier. if the boat was in the water the noise will go away.

  8. #6
    gn7
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    The flapper will make a pretty loud slapping noise at an idle. But as Impatient said, it could be driveline related to.
    If you posted a pic of the driveline, somebody here could tell you how to disconnect it.
    Does it go away if you bring it up off an idle?

    Like smokenjoe said, a little load on the impeller by being in the water might make it stop.



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    Last edited by gn7; 07-13-2013 at 07:55 PM.

  9. #7
    Member CashLeak's Avatar
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    Didn't notice it at the lake last Sunday but I did more floating and drinking because it ran so crappy. I limped back to the ramp. It has an aluminum A/B cut impeller according to the previous owner. He was a machinist and had Ray Defer help him set it up. I did find a grease fitting on the u joint but cant seem to get the grease gun on it. It looks like a glenwood bell housing I removed the upper starter inspection plate I still don't see a way to un bolt the driveline . Ill look I took some pics Ill try to post them . It also has a custom strut between the stringers and bolted to the bell housing and pump Its stainless also made by the previous owner
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  10. #8
    Member CashLeak's Avatar
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    OK Its a new day so ill get some better pics try some of the things that have been suggested. Got to get this thing running good next weekend were going to the lake with some friends . Don't want to get towed off by a wake board boat !!

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    I had a flywheel come loose from the crankshaft and it would make noise at idle but would go away when there was a load on it. Wouldn't hurt to check if your going to be down there.
    Last edited by jms-1; 07-14-2013 at 10:30 AM.

  12. #10
    Member CashLeak's Avatar
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    Default New Pic

    OK im adding a pic of my pump. I would like to know how to disconnect the driveline so I can tell whats clunking the pump or the motor. I tried several different positions and still cant get on the grease fitting on the U joint
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  13. #11
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    I don't think you can disconnect the driveline with that deal. If you remove the 2 allen bolts at the rear of the housing does the bottom half come off? Does it have 4 point mounts?

    If you have only noticed the noise on the trailer and the impeller isn't loose on the shaft i would agree with the rattle/splines deal. You have a grease gun with a needle tip?
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    That's a puller.
    It may be OLD ,it may be Slow ... but at least it's MOBILE !!!

  15. #13
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    I ended up pulling the engine. The clunk is a main bearing that's spun I think. I found small amounts of metal in the oil up in the head. It stall ran and had oil pressure . My machine shop/ Engine builder is going to tear it down tomorrow. Wish I could have figured it out a little sooner I hope to have it together in a few weeks

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