Re: [OMC-Boats] Another tilt problem

Hi Ethan:

It's all I can do to keep it from pulling itself apart. I've got the retainer bracket on both my boats, and without it, the shaft, worm gear and plug would eject into the lake each time I pushed the up button.

It's not necessary to remove the tilt motor or the clutch pack or the big segmental gear to assemble or reassemble this stuff. Remove the snap ring with a snap ring pliers, CAREfully remove the brass plug without chipping the aluminum housing - I grab its edges with two tiny screwdrivers or make it fall out by pulling up slightly on the outdrive - and you can see the end of the worm gear shaft - its up in there. Grab the shaft and see if you can pull it out. Otherwise, you might have to "unwind" the worm gear from the driven gear it engages. When you get it apart, you'll probably discover that the pin which keeps the worm gear from rotating on the shaft is sheared off - as others have noted.

You can reassemble the same way - by rotating the worm gear so it winds onto the driven gear below it. One thing - when you think it's fully on, you have another 1/4 inch to go - that's the slot on the far end that must slip onto the hammer-blow coupling. I just rotate and jiggle until it slips onto the coupling and seats itself. Then the plug/shaft-bearing goes in and the snap ring and/or retainer bracket goes on.

Good luck.

-Doug Julien

--- On Fri, 6/19/09, Ethan Brodsky <brodskye@...> wrote:

> From: Ethan Brodsky <brodskye@...>
> Subject: [OMC-Boats] Another tilt problem
> To: omc-boats@...
> Date: Friday, June 19, 2009, 10:09 AM
> Unfortunately I have to join the
> ranks of folks on this list having
> problems with their tilt system...
>
> Has anyone here pulled apart the actual tilt drive shaft on
> an OMC
> sterndrive ('70 155 hp)? I'm talking about the longitudinal
> shaft that runs
> from the tilt motor through the firewall and along the top
> of the tilt
> clutch housing. My tilt stopped working yesterday
> afternoon after a day of
> diving. The tilt motor is still spinning, but the
> worm gear is not moving
> at all, so the drive was stuck down.
>
> I suspected a bad hammer-blow coupling, so I pulled the
> motor and coupler
> out from the inside, but it looks fine. The motor
> looks and works okay as
> well (a bit of corrosion, due to water leaking in throgh
> the tilt housing),
> though it does turn slightly faster in one direction than
> the other when
> tested unloaded.
>
> My understanding is that a slipping tilt clutch would still
> allow the worm
> gear to rotate, so if the worm gear isn't turning, then the
> only
> possibility I can come up with is that that longitudinal
> shaft has failed.
>
> The "flat-blade drive" on each side (motor and shaft) is
> intact (motor
> clearly is, the external shaft feels okay, but it is a
> tough reach; I will
> look with a mirror this afternoon when I'm not working in
> the dark). Are
> there any other couplers in the external shaft? It's
> hard for me to
> believe the shaft would've sheared - it seems like it
> would've failed at
> one of the couplers. The other possibility is that
> the hammer-blow failed
> in some way that isn't visually apparent, but I don't think
> there's even
> room in there for it to spread apart.
>
> I was just wondering if anyone on this list had pulled that
> shaft out. I'm
> concerned that it might be difficult to get back in or to
> reseal the endcap
> (which doesn't seal anyway - I'm pretty sure that's where
> water leaks in).
> I can't decide if I should put it all together and try it
> again before
> further disassembling things (the safe choice, but very
> annoying
> considering how difficult it is to get the tilt motor in
> and out), or just
> pull it apart and confirm that everything else is okay
> (also probably
> better for the motor, since it seems to be the fragile
> component, and
> repeated installation can't be good for it).
>
> I presume the procedure is to take off the sector gear (so
> the clutch
> housing can rotate freely), remove the retaining ring at
> the end of the
> longitudinal tilt shaft housing, then rotate the tilt
> clutch to "spit out"
> the worm gear shaft?
>
> Ethan
>
>
> --
> <a href="http://www.engr.wisc.edu/~brodskye/">
> Ethan Brodsky </a>
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Received on Friday, 19 June 2009