Mountain Off Road JM25840L User Manual
Mountain Off Road For the car
MOUNTAIN OFF ROAD ENTERPRISES, LLC.
P.O. BOX 690 DELTA, COLORADO 81416
970-625-0500
970-625-3747 FAX
E-mail:
www.mountainoffroad.com
INSTALLATION INSTRUCTIONS
for
JM25840L BombProof™ MOTOR MOUNTS
Please read and understand all instructions before beginning the installation of these motor mounts. Please read
the terms and policies on the back of these instructions.
The JM25840L motor mounts are a one inch lifted version of our standard motor mounts. They are designed to
fit the following Jeep® vehicles: 1987-1995 YJ Wranglers equipped with 6-cylinder engines (4.0L or 4.2L), 1997-
2006 Jeep® TJ & LJ Wranglers equipped with 4.0L engines. ALL Jeep® VEHICLES USING THESE MOUNTS
MUST HAVE A ONE INCH BODY LIFT INSTALLED!!! The design is such that you will notice more vibration
then the stock rubber motor mounts, mostly at idle. However, the fact that the engine will be “clamped” in
place far better then the stock mounts is worth the slight increase in vibration.
STEP 1:
With the Jeep® on flat level ground, apply the parking brake, block the tires so it cannot move.
Put the transmission in neutral. Using a jack, place a block of wood between the jack and the oil pan. Apply a
slight amount of pressure on the oil pan. Remove the bolts holding the fan shroud to the radiator. (The shroud
should have been “lowered” one inch with the body lift kit. You will re-attach it to the “stock” location after the in-
stallation of the lifted motor mounts.
STEP 2:
Remove the drivers side stock motor mount. Save the hardware that you removed because it
will be re-used. Install the BombProof™ motor mount in it’s place. On some models of Jeep® vehicles we have
found that the factory does not machine the block mounting “fork” deep enough for the BombProof™ mount to fit
into it. This means that you must grind the “fork” until it does fit! See above photo. Also, on some Wrangler vehi-
cles, we have found that when lifting the engine, the engine mounting fork can contact the frame of the Jeep®. If
this is the case on your vehicle, modifications to the frame and or fork may have to occur. Use common sense
when performing this modification. Do not tighten any of the nuts or bolts at this time. If your vehicle has a after-
market suspension lift kit that uses spacers between the skid plate and frame to lower the transfer case, this can
cause the motor mounts to be slightly out of alignment. If you have trouble lining-up the thru-bolt, it may be nec-
essary to temporarily un-bolt the transmission mount from the skid plate and raise the transmission up slightly
until the thru-bolt lines up.
STEP 3:
Remove the stock motor mount from the passenger side of the engine. Install the BombProof™
motor mount in it’s place. On some models of Jeep® vehicles we have found that the factory does not machine
the block mounting “fork” deep enough for the BombProof™ mount to fit into it. This means that you must grind
the “fork” until it does fit! See above photo. Also, on some Wrangler vehicles, we have found that when lifting the
engine, the engine mounting fork can contact the frame of the Jeep®. If this is the case on your vehicle, modifica-
tions to the frame and or fork may have to occur. Use common sense when performing this modification. Re-use
the stock hardware. Do not tighten the nuts or bolts yet. If you had un-bolted the transmission mount from the
skid plate in step 2, you can now lower it back into place and tighten the bolts that you removed.
You may need to grind clearance in this area to
allow the BombProof™ mount to fit into the
factory “fork”. More common on YJ’s.