Great write up! I know where I will be sending customers for motor mount info!

 

Are you sure it's ok to jack up the engine by the oil pan?

 

Yep! just do it as bill suggests....!

 

.... just excercise caution and common sense; both will take you a long way.

 

I have one question on these mounts. The factory ones take up the vibration to help provide a smoother running car / chasis. With these installed, that vibration is now transmitted through the body via the more solid mounts. Question I have is over time, could this lack of dampening lead to stress cracks in the aluminum mounting plates and / or the frame where the mounts bolt to? If the car moves with the torque of the engine, I would think the frame / chasis is taking alot more stresses. Great for helping with throttle response, but any side affects long term?

 

I can see additional load/stress being applied to the frame and mounting components, but as to what long term effects it may have, I don't know.
However, if running a monster motor on slicks, the applied stress may be significantly greater.

 

I think it would be safe as you have the block of wood. It distributes the force more evenly with a little bit of give. My Monte Carlo's oil pan even had something stamped on the bottom of the oil pan saying something to the effect of "Lift engine here using wooden block" I can't remember the exact wording. Of course, the Monte had a very thick oil pan with ribbing for reinforcement. I would be a little cautious and check whatever car your working on to see if its safe. I know a lot of old cars had very thin oil pans, but at the same time they were easy to lift with chains.

 

They ad more feel but reduce stress on the brackets by not letting the motor wind up
and yank on the bracket.

Jay

 

Has anyone done their Prothanes AFTER already having longtubes installed??

 

Matt,
I installed my LT's last Dec. & the Prothenes early summer.
Should have done it all at once. The prothenes took me an extra afternoon.

 

Did you have clearance issues? What problems did you run into?

 

This is a very old "Taco Bill Post". But I finally put the CalStang back up on the jackstands, to get this Prothane Brand "Urethane" Motor Mount Kit install completed at last. Had purchased a set of the shortened black mounts from a fellow TMS member last Fall. Got the shorter ones because we just wanted the engine to sit a little bit lower for a future strut tower brace so it would then to clear with great ease.

As usual "TB"s install instuctions and pictures were very helpful, but he did not explain every single detail of that install process! But that was just fine. Because us old wrenches just figure out the rest and then we get it all done! Years of moding and tinkering really helps with the how-to-do aspect of solving part of this install process! First. A lot easier install for room if you remove both front wheels before starting.

One thing is that clearances to disconnect those engine mount brackets are hell-ishly tight!! You will need a good shop light, several of long socket extentions, a swivel and also the deep wall sockets before you even dream of doing this swap project! It was all very tight up under there and a just little frustrating to get your handes up in there too. The passenger side was a bit of a Mo! But just relax and take your time and you will be fine with getting it all done!

Lastly. We used the 17MM hex head bolts and washers to attach the engine mounts to the engine brackets after putting some "Black Moly" on threads. Now Love It! Money well spent!! Mounts really tightened everything up down there compared to the "Jelly Filled" stock units! And it now power shifts a lot better in the 2-3 gear change. Another added plus is that they look very sharp there in the engine bay. For when you are on display at the car show events too! See the Pix!! Our take on this great writeup! Thanks Taco Bill!! "RC"

 

Excellent guide Bill - I did this install a couple nights ago taking my time and it worked out well. It took some contorting to get those brackets torqued down but the swivel sockets did a great job in those tight quarters.

Glad to get those Jell-O Jiggler mounts out of there!