Engine Mount Direction?

[bobscott]

During my tear down I didn’t notice that the engine mounts are not symmetrical. One side has a longer flange than the other. The holes for the bolts to bolt the mount to the block are not quite the same distance from the center stud either. I searched high and low and haven’t been able to find which way these go back on. I have a bare frame now so I can’t take any measurements from the tranny or anything to figure this out. Can someone please help.

I have attached a picture from WH's site. The mount on the left shows what I am talking about, the back side flange is longer than the front side.

Thanks

 

[red hot71]

There's only one motor mount. I think when Ford cast the blocks they took this in to consideration.

 

[70_Steve]

I searched high and low and haven’t been able to find which way these go back on. I have a bare frame now so I can’t take any measurements from the tranny or anything to figure this out. Can someone please help.

There's only one motor mount.

The two motor mounts in the pic from WH shows they are both identical. There is no left and right motor mount. Pick one, bolt it up to the motor and drop the motor in.

 

[AZ73]

They seem different, but they are not. the motor mount location on the block is what's different. The mount on the PS is slightly ahead of the mount on the DS.

 

[bobscott]

Yup they are the same. I wasn’t clear, please see this picture. What I am calling the flange is the top part that bolts to the engine block. One hole is maybe ½” farther from the stud (the bolt that gets bolted to the frame) than the other. My concern is if I put it one way vs. the other I will get half inch difference where my engine is located.

 

[AZ73]

Yup they are the same. I wasn’t clear, please see this picture. What I am calling the flange is the top part that bolts to the engine block. One hole is maybe ½” farther from the stud (the bolt that gets bolted to the frame) than the other. My concern is if I put it one way vs. the other I will get half inch difference where my engine is located.

Short answer:

Just pick either one and mount it to the DS, then take the other one and mount it to the PS. You'll be fine.


Long answer:

See my comment above. The Motor mounts need to be offset on the DS and PS because the mounts "wrap" around a cylinder. The difference in flange lengths makes this happen. Your cylinders are offset so the opposing side connecting rods can attach to the crank next to each other. The difference in your "flange" length is so the bolts to the frame will line up. The PS is slightly forward mounting on the block to clear cylinder #2 so the longer flange pushes the frame mounting bolt back. The DS is slightly backwards mounting on the block to clear cylinder #6. and the longer flange pushing the frame mounting bolt forward. The offset flange is used to make the frame mounting bolts in the same even position on the frame. The mounts are exactly the same and will offset both sides exactly the same, one side forward, the other side backwards. It doesn't matter which mount you put on which side. They will offset the frame mounting bolt correctly.

 

[TwoDalesDad]

Point the engine toward the radiator......That should help...

 

[Kyle.malone]

Just slap them on.. Doesnt matter which side.. Drop the motor in and be done with it. When you go to the parts store, you dont need to tell them which side it is on becasue they are the same. The mounting location on the motor is different but takes the same mount.

 

[bobscott]

Got it, thanks a bunch for the help.

 

[66Coupe]

Any suggestions on where to get my engine/tranny mounts? Parts store prices vary a good bit from some of the Bronco websites. Ive seen prices from $17 each - $100. Am I missing something?

 

[DirtDonk]

You should not be paying 100 bucks for stock mounts. At those prices you're talking about the custom "Extreme" type mounts.
We sell the stockers for about 40 the pair, so that puts them right in line with your lower pricing, and our custom mounts are normally 140.

Not sure what you're getting for 100 on a stock type, but it would be worth a call maybe to see if there's something grand-wazoo about them.

About the only thing I'd say to look for with stock mounts is to make sure they have the big retaining studs through and through. Most of the original EB mounts had some sort of safety device I'm sure, but it wasn't visible (or effective) on the ones I've seen. In later years the full-size truck versions got a more robust mount with what looked like a big rivet head sticking out. Those are the ones I'd look for if I was buying a set now.

I used to recommend asking for a mid-nineties F-250 with 351W engine to get those.
But nowadays some manufacturers at least are making them all alike.
The ones we stock usually have that feature. Worth looking for specifically though.

Paul

 

[Ourobos]

Got it, thanks a bunch for the help.

If I'm understanding you, the mounting bolt on the mount is offset and not centered on the holes that match the block? If so, put them so that the bolt on the motor mount is further towards the back, which would make the engine slightly more forward. Putting them with the bolt more towards the front would move the engine back, and is intended for custom applications where the engine needs to be moved back from stock.

 

[AZ73]

If I'm understanding you, the mounting bolt on the mount is offset and not centered on the holes that match the block? If so, put them so that the bolt on the motor mount is further towards the back, which would make the engine slightly more forward. Putting them with the bolt more towards the front would move the engine back, and is intended for custom applications where the engine needs to be moved back from stock.

You can't "put them so the bolt on the motor mount is further back". The bolt for the frame IS offset compared to the mounting holes on the block, but only by the amount the holes on the engine block are. They're offset on the block EXACTLY the same amount as the frame bolt is on the motor mount, and they're offset the same amount on both sides of the block, just in different directions. SO the block holes on the PS are forward slightly compared to the block holes on the DS. The motor mount has the bolt for the frame shifted slightly so that of you mount it on the PS, the bolt sits to the rear slightly and if you take that SAME motor mount, flip it to the DS, it now is offset slightly forward. In reality, the frame bolt never moves. It's the mounting holes to the block which do. No matter which mount you put on which side, the frame bolt will ALWAYS be in the same spot on the frame, holding the engine in the same spot. See diagram below.

 

[bobscott]

Yup AZ is right. I was cleaning mine up to paint and had a ohh crap moment. My motor was at the machine shop or I would have held them up to the block and quickly figured out it did not matter. Can not put them on wrong. They are identical so no offset is possible.

 

[Ourobos]

You TOTALLY missed what I said.. I'm not talking about the block or the k-member.. I'm talking about the actual MOUNT. I have seen some that the bolt that protrudes FROM the mount is not in the center of the mount. It will be forward or backwards some from center, and if you can explain to me how THAT would be the same on either side, all my physics classes were moot.

If the bolt is centered, then it doesn't matter.

 

[AZ73]

You TOTALLY missed what I said.. I'm not talking about the block or the k-member.. I'm talking about the actual MOUNT. I have seen some that the bolt that protrudes FROM the mount is not in the center of the mount. It will be forward or backwards some from center, and if you can explain to me how THAT would be the same on either side, all my physics classes were moot.

If the bolt is centered, then it doesn't matter.

If you can't open up the PDF I attached above, then borrow a computer that will open it. You'll see that the bolt ISN'T supposed to be centered. It's SUPPOSED to be off-set. The explanation is as clear as the picture I drew and physics has nothing to do with it.

 

[savage]

I have those mounts on my 74 302,and you cant put them on wrong,they will work on either side!!!!!Theirs nothing to explain if you order the right mounts,even the extreme engine mount from HW are offset,but just by looking at them they look like the center bolt is centered, but the mounting hole are are not equal.

 

[Ourobos]

If you can't open up the PDF I attached above, then borrow a computer that will open it. You'll see that the bolt ISN'T supposed to be centered. It's SUPPOSED to be off-set. The explanation is as clear as the picture I drew and physics has nothing to do with it.

Think about it smart guy.. See how the mount is sitting now.. Imagine those bolted to an engine.. The bolt is towards the back of the mount. Now if you rotated that mount to the other side of the engine, the bolt would be toward the front. How could that not be different? I've installed HUNDREDS of small block Fords, not all bronco specific, but there is a difference.

Again, this is on an uncentered mounting bolt on the mount.

 

[garberz]

I'll have to side with AZ73 on this. The mount is the same, with the stud offset. It doesn't matter what side of the block you put the mounts on, the frame accepts the offset for each side. Look at the PDF.

 

[Ourobos]

Let me clarify for you, the PHYSICS and geometry of it.

Here a standard ford 302.

Here's an offset motor mount in the normal location, with the stud towards the back

Here they are swapped to opposite sides, stud to the front

Here they are in comparison if you can't see the difference, which obviously you can't. Notice the difference in offset

End of lesson.