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-   -   How much clearance should there be between motor mount and motor mount bolt? (http://www.hotrodders.com/forum/how-much-clearance-should-there-between-motor-mount-motor-mount-91297.html)

firstgear 06-08-2006 06:06 PM

How much clearance should there be between motor mount and motor mount bolt?
 
I have what I consider quite a bit of clearance between the motor mount and the motor mount bolt, is this typical?

http://images15.fotki.com/v260/photo...54small-vi.jpg

seems to me that at most there should be a few thousandths, but it is more like 1/4" to 3/8"......thoughts, nothing to worry about? I can just see the motor reving up against those bolts and getting a good chance to run up at it....comments??????

dgcantrellsr 06-08-2006 08:19 PM

Quote:

Originally Posted by firstgear
I have what I consider quite a bit of clearance between the motor mount and the motor mount bolt, is this typical?

http://images15.fotki.com/v260/photo...54small-vi.jpg

seems to me that at most there should be a few thousandths, but it is more like 1/4" to 3/8"......thoughts, nothing to worry about? I can just see the motor reving up against those bolts and getting a good chance to run up at it....comments??????

You will never know it , if it were in the thousands , you would never get the engine lined up on both sides.

FEDDO 06-08-2006 09:35 PM

bolts
 
Use thick, large washers.

firstgear 06-09-2006 08:31 AM

Quote:

Originally Posted by dgcantrellsr
You will never know it , if it were in the thousands , you would never get the engine lined up on both sides.

that is basically what I wanted to hear....thanks!

496CHEVY3100 03-20-2013 07:04 PM

I dont think you have any thing to worr about ,it has to have some clearance .dont use washers or bigger diameter bolts ,the ones you have are much stronger than the rubber bonded to your mount ,just a note i had to change my frame mounts also ,but mine is an 88 it is not a bolt in like everyon said when i started . Good Luck

hcompton 03-21-2013 08:25 AM

Is there gap in between the mount and the tang on the engine. Can the engine wiggle back and forth or is it tight fit. I would use washers to tighten the space between the mount and the tube on the engine side of the mount. This should allow you to tighten the bolts down so it doesnt move.

If your looking for smooth ride get stock mounts. Other wise tighten it down so its locked in place. It should lift a fender when it revs not just wobble around inside the engine compartment like a stock engine.

MARTINSR 03-21-2013 10:33 AM

I have to go with the point on fitting the engine. Try putting those bolts thru the mounts when dropping a motor into a 70 Camaro or something like that with the front sheetmetal on and you are laying under the car with it on jack stands. You would be damn happy to have that little wriggle room and it would be perfectly clear why it HAD to be there. If it was a few thousands you would NEVER get that bolt in! There has to be a little room to make up for flaws in the location of the mounts on the frame and motor. There is no way there can be absolute perfection in where those mounts are mounted on every frame in every car, even from the factory. A little sagging of a frame over it's life, different brand mounts, etc, there are way too many variables to ever have a perfect hole for that bolt to go thru.

Use the larger, thicker washers and tighten it up well and there you go.:thumbup:

Brian

oldbogie 03-21-2013 12:47 PM

Quote:

Originally Posted by firstgear (Post 648322)
I have what I consider quite a bit of clearance between the motor mount and the motor mount bolt, is this typical?

http://images15.fotki.com/v260/photo...54small-vi.jpg

seems to me that at most there should be a few thousandths, but it is more like 1/4" to 3/8"......thoughts, nothing to worry about? I can just see the motor reving up against those bolts and getting a good chance to run up at it....comments??????

This makes up for the fact that chassis are really pretty sloppy when it comes to assembly so the stack-up of tolerances requires some give when it comes to the engine and transmission's attachement. They take the adjustment at the engine as that's fewer oversize holes. Once the bolt is torqued the engine isn't going anywhere, so this isn't a problem. If you use a hardened washer between the underside of the bolt head and the mount, it won't distort like a regular washer so it will insure the bolt's clamping force is well and stablely transfered into the mount.

Bogie

cdminter59 03-21-2013 09:10 PM

How much clearance should there be between motor mount and motor mount bolt?
 
Use grade 8 bolts with flat washers and locknuts. The bolts should be 4 1/4 x 7/16.


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