Mr Gadgets

Payton,
I guess I left a little of the story out.. after I aligned the motor, I pulled it back out and put my old coupler back in.. then ran it for 6-8yrs.. and Yes I did return the borrowed coupler. !
Bowtie, I did not realize that they eleminated the spring washers on the new mounts.. That is a cause for confusion. My bellhousing and transom plate are from my old 88 checkmate. Good point to remember when mixing and matching.
Twin Spins, thanks for that thread. I was talking to Goebel about things and he told me of his problem with the coupler/inputshaft. I have heard of other engine failures due to that issue..
I would suspect that if the drive was causing a problem it would have self destructed by now.. Besides if he put a whole new input shaft in, the drive would be opened up and you would see something. Not that something can't be binding up while cruising, but I think the drive would show signs of self destruction.
I know of one boat that had Stellings boxes and the bearings inside were not aligned properly.. they snapped the splines off the coupler yoke, on both drives.
This is a tough one.. Just a thought, maybe you could fasten a rod to the engine, say on the valve cover bolts?? At the end of the rod tape a magic marker on it, just touching the transom. If it moves you would see a mark. If the distance got closer, it would push the marker on the rod.. Kind of crude, but it may tell you something. If there is flex in the transom, I would think the highest stress would be from getting on plane? What does every one think?
Dick

TWIN-SPINS

could he have trim cylinder leaking down,,and letting the drive bounce around while he running,,,that could put it into somekind of bind,,,,i thought i read someone else had a problem like that????

JasonSmith

You don't start the thing with the drive trimmed all the way up do you? Do you boat in shallow areas where you have to trim the drive way up while idling around?
I know a guy who beached his boat a bunch & he always trimmed it up to the trailer position & he broke stuff like you are.

Panther

Yeah, I found that out the hard way rigging a new bravo engin package in a SeaRay last year... Had me scratching my head for a few minutes....

bowtie

I found out the hard way also, installed new mounts into a flywheel housing and didn't read the little piece of paper that came with them. I don't know how many rear motor mounts I have pressed in over the years so why do I need to read directions on doing that? Now I find myself reading those little notes.

blue thunder

You say you replaced the input shaft to the drive, but did you replace the input shaft to the drive? That would be the one that gets the pinion gear mounted to it. If the yoke is tweaked you would have serious stress issues on the cross upon assembly and then much worse in operation. I highly doubt a transom or stringer issue as you would need 15*+ flex to approach failure. The boat would be on the bottom long ago.

Mr Gadgets

I think he said they replaced the whole shaft. If it is the new style, then he shouldn't have to worry about binding the ujoints, because of missing spacers in the trim cylinders. I am not sure, but I think that is only needed for the old style XR/XZ ujoints. I have seen them crack a yoke if trimmed up too far. Shouldnt be an issue with the new style. But then again, you shouldnt run them in the way up position.. as Jason said.
This is a tough one, any pics of the damage?

Pismo10

I like the something binding in the drive theory.