Driveline chatter
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Driveline chatter

  1. #1
    Senior Member Texgo's Avatar
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    Default Driveline chatter

    I got my boat running a couple of weeks ago. I have some chatter from the driveline. There is some slack where the driveline yoke meshes with the splined end of the pump. I can hear it on and off when I am cruising. I just have a stock Olds - no big horsepower, and I would like to get through the season. I know the pump shaft is softer than the yoke, and it is probably what is worn. My question: How much slack is OK, and will this damage anything more in my pump?

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  3. #2
    Urban Cougar Trapper Gopher711's Avatar
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    Take the driveline off and see if you can wobble the pump input shaft by hand , make sure it's not your pump bearing , it should not have any play and turn smooth with no binding , grinding , etc
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  4. #3
    Senior Member Texgo's Avatar
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    I rebuilt the pump, and it has a new bearing.

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    Senior Member 74glencoe's Avatar
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    Are you sure that the slack is in the splines? It might be in one of your u joints, especially if driveline Is not setup correctly. What pump and what driveline? It might be the input or thrust bearing as mentioned above even if new. It could have not been properly greased/lubed. Pics would help a lot, with stock olds I doubt that the pump shaft is messed up just because of normal use, there is likely a bigger and deeper problem.

  7. #5
    Senior Member wolfie's Avatar
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    Something I'd found earlier and posted on another Forum on driveline geometry.


  8. #6
    Senior Member Texgo's Avatar
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    The pump is a Berkeley JC. The driveline is a 1310. I put full synthetic grease in the pump and on the splines after I rebuit it. The engine aligns pretty much at a straight line with the pump. I didn't do a perfect job of that on purpose based on what other folks said about having them too straight. I'm not near my boat but I have this photo, and a photo of the same type of driveline (not mine, but the same kind).
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  9. #7
    tintingsandiego krusn56's Avatar
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    Like in the video... you want the pump shaft an crankshaft aligned/parallel but have at least .5-3 degrees in the shaft itself. Meaning motor/crankshaft up or down from pump shaft but keeping shafts parallel.
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