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Front Engine Mount Bolt


TBVR4
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Galant VR-4 org Post #: 925740 posted 08/26/10 02:29 PM     Remind Me!  Send Private Message   Edit Post      
I am replacing my front engine mount with the 13-505 Prothane bushing. I noticed that the bolt that passes thru the bushing sleeve is considerably smaller than the hole in the bushing sleeve. The stock mount that was removed had the same sized hole as the prothane I am installing. Is this normal? Should there be that much play between the bolt and the prothane bushing sleeve? Should I drill out the bracket to accept a larger bolt that fits the bushing hole? Thanks

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92Galant926
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Galant VR-4 org Post #: 925757 posted 08/26/10 03:12 PM     Remind Me!  Send Private Message   Edit Post      
Mine is the same way. I noticed it a while back when I took my motor out. Cant really say if that is how it is suppose to be, but im in the same boat.

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Garfield Wright
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Galant VR-4 org Post #: 925762 posted 08/26/10 03:39 PM     Remind Me!  Send Private Message   Edit Post      
Yes that's how they are. If you notice the center sleeve has ridges on the edges to lock in the bolt. You're supposed to measure the propper height then tighten. No one ever does that though. I just replace mine last night with a new Billet mount made by Torque Solution. The center sleeve is noticably smaller than the factory unit. 1st impressions is that I hardly notice the mount was changed & I'm very picky when it comes on to ride quality .

This will help minimize engine movement. This is really crucial especially the guys running an upgraded turbo where the real estate in the front is almost non-existent. This picture is not of my car. I forgot to take a picture of the mount before I installed it. Once it was installed I couldn't see it anymore due my intercooler piping.

EDIT: I forgot to mention that I had to use a longer bolt on the front of the crossmember. The Torque Solution's mount is significantly beefier than the oem unit.



Edited by Garfield Wright (08/26/10 03:43 PM)

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TBVR4
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Galant VR-4 org Post #: 925811 posted 08/26/10 06:57 PM     Remind Me!  Send Private Message   Edit Post      
Thanks, I did a quick measurement and it looks like the center of the new bushing will fall within the spec listed in the manual, so I am going to go up in bolt size to minimize movement. I appreciate the input or I would have never figured it out! Then it is on to the back one. I am sure it will be lots of fun!

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TBVR4
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Galant VR-4 org Post #: 925955 posted 08/27/10 10:02 AM     Remind Me!  Send Private Message   Edit Post      
Anybody drill their bracket from the engine that is bolt goes thru into the new mount to accept a larger bolt? If so how hard was it to get to line back up? Thanks

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Speed_Racer
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Galant VR-4 org Post #: 926006 posted 08/27/10 01:00 PM     Remind Me!  Send Private Message   Edit Post      
If the bolt is tightened down properly there wont be movement. Why would you drill out the bracket for a larger bolt? Am I missing something?

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TBVR4
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Galant VR-4 org Post #: 926013 posted 08/27/10 01:32 PM     Remind Me!  Send Private Message   Edit Post      
The hole thru the stock mount and the new prothane mount are quite a bit larger that the factory bolt, thus allowing possible movement. So I guess my question is will it stay put using the factory torque spec of 36-47 ft-lbs.?

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Speed_Racer
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Galant VR-4 org Post #: 926247 posted 08/28/10 06:57 PM     Remind Me!  Send Private Message   Edit Post      
I dunno. I usually use my impact, set low which gives about 80ish ft/lb. I have never noticed any movement, but if it gives you piece of mind I guess why not do it. Just seems unnecessary to me.

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TBVR4
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Galant VR-4 org Post #: 927274 posted 09/02/10 05:30 AM     Remind Me!  Send Private Message   Edit Post   
I ended up installing the front mount after installing the other three. I used a slightly larger bolt after jacking up the motor to reach the 1.7" - 2.0" length spec to the center of the bolt. The engine will probably never move due to the stiffness of the the polyurethane mounts, so I didn't concern myself with trying to drill out the bracket to accept a larger bolt. I tightened the bolt to 60 ft-lbs and called it a day. Started it up, minimal viration. Should do well. I am thinking gear changes will be much improved, we will see. Thanks everyone for their input.

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