Motor placement help
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Motor placement help

  1. #1
    Senior Member californiadreamin's Avatar
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    Default Motor placement help

    Changing oil pan and motor mount set up. How can i figure out how high to set the motor in relation to the pump? Do i want the crank perfectly straight with the pump shaft or can it vary slightly?

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    Senior Member 74glencoe's Avatar
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    From hangin around I hear the best is no more than four degrees off the line of the pump shaft. I know for sure that the more angle you put in it the more HP lost in the driveline, but I think there is supposed to be a little angle to encourage the U-joint caps to rotate on the bearings. Someone with a better answer will chime in.
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    Senior Member bigblock68's Avatar
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    if it is perfectly straight your u joints will rattle like hell

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    Motor and pump should be parallel,[ same number of degrees] but drive line should be 1or2 degrees off. I prefer up on front of drive line.

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    Senior Member californiadreamin's Avatar
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    ok so whats the best way to measure my angle?

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    Quote Originally Posted by californiadreamin View Post
    ok so whats the best way to measure my angle?
    Digital level. Measure along pump mount at intake. And remove carb,measure at carb flange on intake manifold.

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    I picked this diagram up from somewhere... Is this the correct placement?

    Would this 'offset' be built into a 3-point engine/pump mount system?
    Last edited by bcfloater; 04-11-2010 at 09:25 AM.

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    Quote Originally Posted by bcfloater View Post
    I picked this diagram up from somewhere... Is this the correct placement?

    Would this 'offset' be built into a 3-point engine/pump mount system?
    That's correct. I've never checked offset in a 3point set up. So don't know. Check it and report back.

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    Quote Originally Posted by Wicked Performance Boats View Post
    I've never checked offset in a 3point set up. So don't know. Check it and report back.
    When I get my boat out of storage I will have to take a close look... My joints make a 'rattling' sound, even with new parts... so this makes me wonder?

    Sorry for the side-track on the post

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    My joints make a 'rattling' sound, even with new parts... Most of the time,I find it's the yoke on the pump splines making that sound at idle and lo speed.

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    Boss of the McIntyre Mob danhercules's Avatar
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    Quote Originally Posted by bcfloater View Post
    I picked this diagram up from somewhere... Is this the correct placement?

    Would this 'offset' be built into a 3-point engine/pump mount system?
    Now, if the drive line bottoms out on the pump, how far up should the motor be moved? In other words, if driveline unbolted from flywheel, how much movement back to the pump before the driveline hits?


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    Quote Originally Posted by danhercules View Post
    Now, if the drive line bottoms out on the pump, how far up should the motor be moved? In other words, if driveline unbolted from flywheel, how much movement back to the pump before the driveline hits?
    Mininium 1/4 inch

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    Quote Originally Posted by Wicked Performance Boats View Post
    My joints make a 'rattling' sound, even with new parts... Most of the time,I find it's the yoke on the pump splines making that sound at idle and lo speed.
    Does that mean it's new H-joint time? Mine's been doing it for 25yrs. now... never gets any better, never gets any worse.

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    Quote Originally Posted by bcfloater View Post
    Does that mean it's new H-joint time? Mine's been doing it for 25yrs. now... never gets any better, never gets any worse.
    nope, best you can do is take driveshaft out every year or so and lube shaft and yoke splines.

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