Re: [OMC-Boats] Another tilt problem

>> 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?

Yeah, without double-checking the shop manual, that sounds right.

-----Original Message-----
From: omc-boats-bounces@... [mailto:omc-boats-bounces@...ultimate.com] On Behalf Of Ethan Brodsky
Sent: Friday, June 19, 2009 9:09 AM
To: omc-boats@...
Subject: [OMC-Boats] Another tilt problem

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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