crazy question time...

[whitehorse]

So a good day of work and my truck will be back on the road...but I've got a problem. Is the bolts on the motor mount different from a 6.9 to a 7.3? I can't get the bolts started...wondering if i messed the threads up putting the engine in? I'm talking about the bolts that go through the cross member if i didn't make myself clear...

 

[ToughOldFord]

They are the same.

 

[whitehorse]

That's what I was afraid of... They look good but it must be the first couple of threads messed up...

 

[icanfixall]

Loosen the mounts and lift the engine so the mounts can move around a bit. The mount might be slightly out of alignment.

 

[whitehorse]

Ok ... can you change the motor mounts without pulling the engine. Guess I need to take the mounts off the 7.3 and use them. Messed up a stud trying to rethread it...

 

[stuborn nut]

not sure the years but my 6.9 takes a nut with 3/4" socket 1/2" stud? I got a 7.3 out of a '89 and they take a 18mm Metric stud maybe.

 

[whitehorse]

Yep..my 7.3 took a 18mm wrench to get the nut off. So I bet there is a difference in the nut size between the two.

 

[ToughOldFord]

Shouldn't be, when I put my 7.3 into my '85 I used the nuts from the 6.9 on the 7.3 mounts since the nuts were missing on it.

Of course you could be dealing with aftermarket (Chinese) motor mounts there.

 

[whitehorse]

OK...swapped the motor mounts today. Put the 7.3 mounts on and the nuts went right on but wouldn't with the 6.9 mounts. It sounds crazy but I think the threads are different...

 

[IDIoit]

i just went from a 87 6.9 to a 94 7.3
everything was the same.
minus the turbo!
i had to use the 6.9 flywheel on the 7.3 due to lack of bell housing room.
i coulda swore those nuts under the frame, were 19MM, guess im wrong.
im hoping the intakes swap over too..

 

[tbirdfiend281]

You know I have run into this before with 1/2 x 13 nuts and some bolts. I have gotten some that have been 18mm sized, but I have also used others that are 19mm. It may be a difference of the outside size of the nut. I am sure someone will chime in with a reasoning to this.