Merc 5.7L thunderbolt pulled to fix transom. Now what?

[Bt Doctur]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

Posting this tool I made to help show in what direction the motor must be moved after the motor is reinstalled.
Using a input shaft, you remove the yoke area and drill and tap for a removal bolt ,no particular length
Next you remove .125 of material from the shaft. .125 or 1/8 inch. this shaft is now 1/8 inch undersized in relation to the gimbal bearing.
a 1/8 inch welding rod can be used as a rough gauge to center the shaft in the gimbal bearing by shifting the engine, followed by the actual alignment bar.

 

[joewithaboat]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

Posting this tool I made to help show in what direction the motor must be moved after the motor is reinstalled.
Using a input shaft, you remove the yoke area and drill and tap for a removal bolt ,no particular length
Next you remove .125 of material from the shaft. .125 or 1/8 inch. this shaft is now 1/8 inch undersized in relation to the gimbal bearing.
a 1/8 inch welding rod can be used as a rough gauge to center the shaft in the gimbal bearing by shifting the engine, followed by the actual alignment bar.

That is a pretty slick idea !

 

[achris]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

That is a pretty slick idea !

Or you could just look in with a torch (flashlight) and see where the coupler is....

 

[Greg68S]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

I'm confused. How am I lining it up? Am I still looking at the stern drive when I'm inserting this? What am I looking at?

 

[Greg68S]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

What's my focal point? The bolt head?

 

[joewithaboat]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

What's my focal point? The bolt head?

No, your looking in at two circles the shaft will be smaller than the gimbal bearing so you look in and try to get equal distances around it.

 

[Bt Doctur]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

the modified shaft is now 1/8 inch smaller dia. than the gimbal bearing I.D.. this works best when you have pulled the motor for coupler replacement.

 

[achris]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

What's my focal point? The bolt head?

The very first thing you need to do is remove the top locking nut off each side mount, then lift the engine (just slightly) using the front lifting eye on the thermostat housing and even up the side mount nuts (so they are the same distance from the lower side of the mount).. That way you'll know the engine is sitting evenly on the rear mounts (I assume you've torqued up the rear mounting bolts).... Then lower the engine back down on the nuts.... Then insert the aligning bar or the modified shaft Doc showed you.

You're looking to ensure the whole bar is central in the bell housing... If it's low, then lower the front engine mount bottom nuts on both sides (evenly)...

The way I do it is to tighten up the rear mounts, then lift the engine on the front lifting eye and run the lower nuts all the way to the bottom. I then use the lifting gear to slowly lower the front of the engine until the alignment looks close (looking at the coupler through the gimbal bearing). I then run the nuts up to the bottom of each of the side mounts until they JUST touch it. That gives me a starting position to go with the aligning bar... Then it's just as I did in the video...

Not science, no mystery, not difficult....

Chris.........

 

[Don S]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

On a side note.. I love this forum. But it needs an APP for iPhone and droid. Lol

Try this.

 

[Greg68S]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

Can anyone direct me to a used bolster seat in ok shape. I'm not to concerned about the color because I'll eventually have it reupholstered.
im looking to stay some what cheap but not bargain basement.

 

[Don S]

Re: Merc 5.7L thunderbolt pulled to fix transom. Now what?

This forum is about engine and drive repair, might want to post that question over in the Boat Topics (NOT ENGINE) forum.