250 Inline 6 Front Mount modification

[Will Fish]

So I picked up the new rebuilt block over the weekend. First thing I noticed was the tab on the front of the motor on the starboard side was missing. I've heard of a few people making a bracket to fit in between the timing case cover and the oil filter. Anyone have any experience in this? Pictures? Materials?

I'm thinking of using two 1/4" piece of diamond plate. I'm nbot too sure how to bolt it to the block. There are 3 usable bolts I can use on the timing case, but they are only 1/4" bolts.

 

[ShowMeGuy]

Re: 250 Inline 6 Front Mount modification

I ran into the same issue, only the marine blocks have that foot cast into them. I ended up holding out until I found a marine casting as I couldn't come up with a clean solution to what you are talking about.
I'd love to see how you go about it......

 

[Bondo]

Re: 250 Inline 6 Front Mount modification

Ayuh,.... I believe Fishermark has done that fab. 'n took pictures to boot....

 

[Will Fish]

Re: 250 Inline 6 Front Mount modification

I also do not think welding a piece of steel will be a viable option. I am not knowledgable when it comes to welding, but I believe cast is nearly impossible to weld.

@showmeguy - I've had automotive engines before and converted them to marine with no issues. To be honest, I thought all 250 blocks had this tab cast into the block. Who knew? It would be a shame to have to rebuild another block, especially the shape of this one. It was in industrial equipment, I think a forklift. Had hardly any use on her and the guy who did the rebuild for me was amazed at the shape of the internal block.

 

[Bt Doctur]

Re: 250 Inline 6 Front Mount modification

friend used some 1/4 aluminum angle and bolted it using existing holes/threaded holes.another option is using inboard mounts.you would have to glass in the mounts/stringers

 

[Will Fish]

Re: 250 Inline 6 Front Mount modification

friend used some 1/4 aluminum angle and bolted it using existing holes/threaded holes.another option is using inboard mounts.you would have to glass in the mounts/stringers

I would think the aluminum would be too soft since it holds the front of the motor up. Although the other side (port) takes the majority of the torque.

I thought about changing the mounts, but that would be a much more involved job, and I just did a ton of glass work reinforcing the transom and the stringers last year.

 

[ShowMeGuy]

Re: 250 Inline 6 Front Mount modification

Ayuh,.... I believe Fishermark has done that fab. 'n took pictures to boot....

here is the thread...

http://forums.iboats.com/mercruiser...s/mercruiser-165-no-mounting-tabs-314908.html

 

[Will Fish]

Re: 250 Inline 6 Front Mount modification

here is the thread...

http://forums.iboats.com/mercruiser...s/mercruiser-165-no-mounting-tabs-314908.html

Thanks. I was looking for the thread. I found the same pics via google. I'm going ot do something similar, using JB Weld and 5/16" bolts. The difference, I'm thinking of using three of the existing holes that hold the timing case cover on, to minimize the number of holes in the cast of the block. I will just need to drill them out from 1/4" to 5/16", and with 3 bolts, it should be more than adequate to handle the torque, especially this side does not take much of the strain except in reverse.

 

[Will Fish]

Re: 250 Inline 6 Front Mount modification

I ended up using (3) 5/16" bolts w/ nuts and flat and lock washers. I drilled in between timing cover bolts, to not disturb the seal already made when installing the cover. Using 1/4" diamond plate, I made a template and used an angle grinder to cust to shape and form to the block. I didn't use JB Weld because it was setting up too fast, and there was too large os a surface area to cover, but the bolts should work out fine. I will just keep my eye on them to ensure they do not loosen up. What I thought was going to be a major issue and initially was going to have to find a new block, I was able to make it work and the new motors running good so far.

 

[ShowMeGuy]

Re: 250 Inline 6 Front Mount modification

Awesome man!!