This DIY describes the process of filling the XD's motor mounts with urethane. The XD has
a lot of “wiggle room” in the stock motor mounts. This causes serious wheel hop issues on “power launches”,
usually not a problem with the stock XD However this could be a serious problem for those that have
gone FI. Wheel hop is not my major concern. For lack of a better way to explain it, I am looking for a way to better connect
the gas pedal to the pavement for autocross. Bear this in mind before you proceed. The XD's “mushy” motor mounts
are made for a quiet and comfortable ride. Should you use this procedure you will have increased NVH in the passenger compartment.
avoid too much NVH, I have chosen to fill only the front and rear motor mounts. Besides filling the side mounts offers little
I looked for urethane motor mount inserts. I have only found one for the XD and it is bloody expensive. The
urethane used here can be had for $20-$40 depending on where you get it.
* 14mm socket wrench
* 14mm combination wrench
* Exacto knife
* oil drain pan, dishpan, etc...
* kitty litter, oil dry, sand etc...
* liquid urethane
(I used 80A liquid
urethane: P/N: 8644K11 from McMaster Carr)
* MEK (methyl ethyl ketone)
* (4) jack stands
* hydraulic jack
* 1-2 hours to complete
* 2 days for urethane to cure
1) Jack car
up and support with jack stands. Car must be high enough for you to easily get to the rear engine mount.
rear engine mount (part number 21930R in attached image)
* Remove bolt number 21920 and nut 1339GB
* Remove the three
bolts holding the mount to the sub-frame
3) Remove front engine mount (part number 21840) using same procedure described
for rear mount.
NOTE: it is not required to support the engine when removing these mounts. The engine's weight is supported
entirely by the upper side mounts (P/N: 21670 & 21930R).
4) The motor mounts have flashing between the voids. To get good fill with the urethane, use a sharp Exacto knife
to cut this flashing out.
Cut out the flashing:
5) Clean the rubber in the mounts using MEK (methyl ethyl ketone).
MEK is available at most hardware stores.
6) Using duct tape, or similar, tape one side of the motor mount. Try to seal as good as you can to prevent the urethane
from leaking once you have poured it.
7) Put kitty litter in a pan, and set motor mounts in it, tape side down. The kitty litter allows you to level the
motor mounts in the pan and will absorb any urethane that may leak past the duct tape.
Here kitty kitty:
8) Mix urethane per manufacturer's instructions and pour into the motor mounts.
1lb 80A liquid urethane kit:
9) After a few hours you can remove the motor mounts from the “litter box” and remove the duct tape. However,
you need to wait for at least 2 days for the urethane to cure to 80%-90% of its full strength. I would not put the mounts
back into the car until 2 days have passed. By the way, the urethane reaches full strength after 7 days.
Thank you for reading. I hope that you find this DIY useful. Happy motoring! - toecutter
Discuss this DIY in more detail here.