Rear Motor Mount Setup
#1
Thread Starter
Registered

Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Boat is a 38 Fountain with SSM #4 drives. Bought boat without power. The boat had rear engine plates, as the aluminum L brackets are still there.
My original plan was to use the ears that mount to the tranny, and get thru bolted to the inner transom plate. However, the ears i had wont work. I have located a set, but now thinking about going to the rear plates.
I am guessing the rear plates are pretty much a standard like the front ones? My bellhousings are the dual cooler type. Im guessing i just need to remove them, and have them machined so the plates can sandwich in there?
Just trying to figure the best route to go on this.
My original plan was to use the ears that mount to the tranny, and get thru bolted to the inner transom plate. However, the ears i had wont work. I have located a set, but now thinking about going to the rear plates.
I am guessing the rear plates are pretty much a standard like the front ones? My bellhousings are the dual cooler type. Im guessing i just need to remove them, and have them machined so the plates can sandwich in there?
Just trying to figure the best route to go on this.
#6
Registered

Joined: Oct 2007
Posts: 8,439
Likes: 93
From: yorkville,il
Boat is a 38 Fountain with SSM #4 drives. Bought boat without power. The boat had rear engine plates, as the aluminum L brackets are still there.
My original plan was to use the ears that mount to the tranny, and get thru bolted to the inner transom plate. However, the ears i had wont work. I have located a set, but now thinking about going to the rear plates.
I am guessing the rear plates are pretty much a standard like the front ones? My bellhousings are the dual cooler type. Im guessing i just need to remove them, and have them machined so the plates can sandwich in there?
Just trying to figure the best route to go on this.
My original plan was to use the ears that mount to the tranny, and get thru bolted to the inner transom plate. However, the ears i had wont work. I have located a set, but now thinking about going to the rear plates.
I am guessing the rear plates are pretty much a standard like the front ones? My bellhousings are the dual cooler type. Im guessing i just need to remove them, and have them machined so the plates can sandwich in there?
Just trying to figure the best route to go on this.
#7
Thread Starter
Registered

Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
#8
Platinum Member
Joined: Dec 2002
Posts: 2,195
Likes: 2
From: Dallas, TX
If your starter is a rear mount (bell housing mount), there were two part #'s for the bell housing...with and without engine mount plate. The without bell housing could be milled/modified if necessary. You could also look at where starter gears are wearing to see if the starter can handle a 1/4" less engagement if the rear mount plates are added.
At then end of the day, the Gil type tranny support mount is likely going to be less re-rigging and easier to align the engines. To do this right, it is really a pretty big project. This is likely why the rear mount plate was removed.
When we added the rear plates, we used a short block, alignment tools, new angle mounts and marked all in place. Then made all and drilled to fit.
In many boats, it will be difficult to work with a fully rigged engine...no room.
At then end of the day, the Gil type tranny support mount is likely going to be less re-rigging and easier to align the engines. To do this right, it is really a pretty big project. This is likely why the rear mount plate was removed.
When we added the rear plates, we used a short block, alignment tools, new angle mounts and marked all in place. Then made all and drilled to fit.
In many boats, it will be difficult to work with a fully rigged engine...no room.
#9
I went through the exact same issue. Project boat with no motors and #3 drives. There were rear plate mounts so I bought front and rear plates. We assembled and installed the motors with front and rear mounts. Went through 2 sets of starters before we realized the bell housing had to be machined 1/4". Anxious to get on the water we took out the plates and bought the transmission to transom plate mounts. Ran this way for 5 years. This year we pulled motors and went back to rear plates (after machining the bellhousings I already have).
That is why I am selling the transmission mounts you inquired about.
You either have to buy "cut" bellhousings or machine what you have. That lesson cost me a few thousand dollars.
As much as I would like to sell my transmission mounts, if you have the rear plates I would machined the bell housings and use the rear mounting plates. In my opinion it ends up with a very solid installation.
Good luck,
Doug
That is why I am selling the transmission mounts you inquired about.

You either have to buy "cut" bellhousings or machine what you have. That lesson cost me a few thousand dollars.
As much as I would like to sell my transmission mounts, if you have the rear plates I would machined the bell housings and use the rear mounting plates. In my opinion it ends up with a very solid installation.
Good luck,
Doug
#10
Registered
Joined: Aug 2005
Posts: 6,306
Likes: 1
From: Between A Womans Leggs in IL
Boat is a 38 Fountain with SSM #4 drives. Bought boat without power. The boat had rear engine plates, as the aluminum L brackets are still there.
My original plan was to use the ears that mount to the tranny, and get thru bolted to the inner transom plate. However, the ears i had wont work. I have located a set, but now thinking about going to the rear plates.
I am guessing the rear plates are pretty much a standard like the front ones? My bellhousings are the dual cooler type. Im guessing i just need to remove them, and have them machined so the plates can sandwich in there?
Just trying to figure the best route to go on this.
My original plan was to use the ears that mount to the tranny, and get thru bolted to the inner transom plate. However, the ears i had wont work. I have located a set, but now thinking about going to the rear plates.
I am guessing the rear plates are pretty much a standard like the front ones? My bellhousings are the dual cooler type. Im guessing i just need to remove them, and have them machined so the plates can sandwich in there?
Just trying to figure the best route to go on this.
i got you covered on the starters too!


