Transom Rear Engine Bolts and Mounting Alpha One Gen One

[76SeaRay]

I have seen an exploded view of parts for the rear engine mounting bolts from the bell housing to the inner transom plate. There appears to be a Design I and Design II. Can someone explain the differences? Also, is there a drawing that shows the correct stack up of the springs, felt pads and spacers (ie what goes between the inner transom plate and the bell housing rear mount, what goes on top of the bell housing rear mount)..

Thanks...

 

[76SeaRay]

Ok, so finally found something on the internet about changing from the coiled spring to just a fiber washer on Design II in 2003. However, I haven't been able to find out if the new design works on the older Alpha One... Anybody know if Design II is backward compatible to older drives?

 

[Bondo]

However, I haven't been able to find out if the new design works on the older Alpha One... Anybody know if Design II is backward compatible to older drives?

Ayuh,...... That depends on the hardware you've got,.....

 

[Bt Doctur]

If you have the the smooth bottom rear seals you need the doublewound washer, if the mounts are knurled on the bottom you dont need them but may need the SS flat washer

 

[76SeaRay]

So, the bottom of the rear mounts are smooth. I have to buy new hardware (misplaced the hardware that came with the inner transom plate) so is it worth it to go to the new design and replace the rear mounts to the knurled type?

 

[Bt Doctur]

either way works,

 

[76SeaRay]

Any idea what the gap is between the top of the inner transom plate mount and the bottom of the bell housing mount? I am in the process of mocking up the front mounts by setting the engine in place on the rear mounts and then aligning. So, using some 1/2 inch washers as spacers until I get the new parts in for the gap. That will tell me where the bottom of the front mounts are located (adjusted to center travel) before I tear out the stringers and replace them. This had a 351 Windsor OMC originally and I can already tell I need to build up the stringers to the bottom of the front mounts.

 

[76SeaRay]

Ok, ran to the store and picked up 1/2 inch flat washers 1/8 inch thick. Took a guess that the gap is 1/4 inch and went with 2 flat washers top of the inner transom plate motor mounts and dropped a 1/2 inch bolt through to hold it in place. Adjusted height of the front motor mounts with my gantry crane chain block then shimmed them. It seemed to align ok. I ran a tape measure in through the coupler and it measures 10 inches from the surface of the gimbal bearing to the inside front of the coupler. The adjustment tool goes in 8 3/4 inches from the surface of the gimbal bearing so looks like it engages the coupler splines by 1 3/4 inches so I am assuming that is as far as it should go in. The tool slides in and out fine and spins easily enough. Had to shim about 2 inches from the existing stringer. Pics attached.

 

[achris]

Here's the service bulletin on the rear mount change...

Service Bulletin 2003-11

Chris.....

 

[76SeaRay]

Thanks for the service bulletin. This line has me a bit puzzled...the flywheel housing engine mount has been adjusted to better align the engine coupler... Does that mean that the flywheel housing (bell housing) design was changed also requiring a different housing to work with the new mount design?? I don't have a serial number on my outdrive but pretty certain it is a late 90's and before the 2003 change (evidenced by the smooth bottom of the mount bushing).

When I first dropped the engine in, I didn't put the washers in there to act as spacers. When I looked through the gimbal bearing I could tell that the coupler opening was sitting low of the gimbal bearing opening. After the two flat washers on each side, they aligned. Then, with only a little work on the chain hoist, the alignment tool slid in easily. From there I shimmed the front motor mounts to the height where it was held by the chain hoist.

 

[achris]

.... This line has me a bit puzzled...the flywheel housing engine mount has been adjusted to better align the engine coupler... Does that mean that the flywheel housing (bell housing) design was changed also requiring a different housing to work with the new mount design??....

No, the mount was redesigned, not the flywheel housing.

 

[76SeaRay]

Thanks for all the info... How do you know if the old mounts pressed into the inner transom plate are good or bad? If I need to change those, I might as well go with the new design.