Author Topic: YJ Motor Mounts - Brown Dog #techtip  (Read 2202 times)

Online Gorilla_Skater

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YJ Motor Mounts - Brown Dog #techtip
« on: February 11, 2015, 10:50:53 AM »
I probably should have done these a long time ago. A broken radiator shroud, trashed transmission mount and cracked exhaust manifold are all probably caused by bad motor mounts.

I went with Brown Dog standard (no MML) poly. I was going to do a MML, but I'll wait to see if I ever do the belly up. We'll see how the Poly works out. I figure the purpose is to keep the motor from flopping around, so the poly will do the best job of that. We'll see how bad it vibes, but I'm pretty sure it'll be fine.

I ordered them Thursday and would have had them Monday except I couldn't get the snow away from the mailbox in time and the mailman wouldn't deliver. They came priority mail, so shipping was fast.

They come with a nice set of color printed instructions and a nice decal. The only issue so far is that there were no washers in the hardware pack. They are very stout and the yellow part (not the bushings) are guaranteed for life.

I hope to get to install tonight or tomorrow night.







1993 YJ  6" lift on 35" Goodyear MTR's, 8.8 rear w/ Spartan, Dana 30 w/ Lockrite & 4.10's
1999 Dodge Ram 2500 8.0L V10 Tow Rig

1N73LL1G3NC3 15 7H3 4B1L17Y 70 4D4P7 70 CH4NG3 ~573PH3N H4WK1NG

Offline MasterDrazhar

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Re: YJ Motor Mounts - Brown Dog
« Reply #1 on: February 11, 2015, 11:45:48 AM »

 Let me know if you'd like a 2nd set of hands for the install if you do it tonight.
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Online Gorilla_Skater

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Re: YJ Motor Mounts - Brown Dog
« Reply #2 on: February 11, 2015, 05:22:22 PM »

 Let me know if you'd like a 2nd set of hands for the install if you do it tonight.

Thanks Draz. I've already started so we'll see how it goes.

First step according to Brown Dog, and they STRESS this, is to remove the transmission bolts.





2. Instead of a block of wood, I'm using my Fister Fab Oil Pan skid.



3. Frank was right, I should have changed this when I had the manifolds out LOL. Look at all that crap in the way.



4. I did the bolt from the top first, then the nut off the long bolt, and then the stud on the mount. I had to play with the jack to get it lined up, but once I did, it the bolt came out relatively easily.

So do you think I needed motor mounts?



5. Drivers side - not bad. Brown dog said that it may be easier to remove the engine bracket and mount together. I didn't go that route. It just took several attempts moving the jack up and down to get it to line up. As Brown Dog said, they fit tight in the bracket, so some grease on the sides made it easier.



6. Passenger side - The Brown Dog instructions said that you shouldn't remove your alternator. You can see it in the bottom left corner of the pic. When the long bolt is pulled out, it hits the alternator. It's close but it's just enough to not let the mount come out... at first. Brown Dog was right, you just have to pull the bolt out as far as it will go, then wiggle the mount and it'll come out. Same with the installation. You just pull the bolt as far as you can, then the Brown Dog mount went in with a wiggle.



7. Make sure to reinstall the transmission bolts. I didn't have to mess with it at all. Once I tightened the Brown Dog mounts, the transmission mount was perfectly aligned. I'm running a Poly Transmission mount.



8. Last was to button up the air box. When I started it ran at high idle, also the brakes were weak, but had a hard pedal. I really thought I messed something up, but I just knocked off the vacuum line off the brake booster. Duh.



So in conclusion, they are a very well made American Product. The fit was perfect. Now, the choice of poly. There is no change in drive live vibes because the angles didn't change. There is a little more vibration at idle in gear. Not bad, and I have no intention to switch to rubber. Like I said, this is one of the FIRST things I should have done to Gorillacon.
1993 YJ  6" lift on 35" Goodyear MTR's, 8.8 rear w/ Spartan, Dana 30 w/ Lockrite & 4.10's
1999 Dodge Ram 2500 8.0L V10 Tow Rig

1N73LL1G3NC3 15 7H3 4B1L17Y 70 4D4P7 70 CH4NG3 ~573PH3N H4WK1NG

Offline Mr. Broken Fister

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Re: YJ Motor Mounts - Brown Dog
« Reply #3 on: February 11, 2015, 08:43:53 PM »
Oh man what was wrong with the originals at least another 10 feet of driving left on them. 

Do the motor mounts come with the frame side mounts as well or is it a separate kit? And for us too lazy to look up what's the cost on these?

On another note how's that oil pan skid holding up?
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Offline JeepinMaxx

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Re: YJ Motor Mounts - Brown Dog
« Reply #4 on: February 11, 2015, 09:47:17 PM »
Fun job!  I run poly mounts with no MML, and don't have engine vibes or driveline vibes...  Your old ones were definitely shot!
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Re: YJ Motor Mounts - Brown Dog
« Reply #5 on: February 11, 2015, 10:29:29 PM »
Oh man what was wrong with the originals at least another 10 feet of driving left on them. 

Do the motor mounts come with the frame side mounts as well or is it a separate kit? And for us too lazy to look up what's the cost on these?

On another note how's that oil pan skid holding up?

No frame side mounts, but they do sell engine side brackets. They are 84.95 plus shipping. Not bad when a set of Autozone Motor mounts are $40 and will shred.

The oil pan skid is working great. No major hits, but some scrapes. I have to redrill the mount holes so the bottom of the skid sits flush with the bottom of the pan. In trying to get it to tuck as high as possible, I went too high, so it's a little tilted.

1993 YJ  6" lift on 35" Goodyear MTR's, 8.8 rear w/ Spartan, Dana 30 w/ Lockrite & 4.10's
1999 Dodge Ram 2500 8.0L V10 Tow Rig

1N73LL1G3NC3 15 7H3 4B1L17Y 70 4D4P7 70 CH4NG3 ~573PH3N H4WK1NG

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Re: YJ Motor Mounts - Brown Dog
« Reply #6 on: February 12, 2015, 08:13:01 AM »
If you're running stock motor mounts, and haven't changed them recently, 5 will get you 10 that at least the drivers side is toast. Sometimes in the resting position, you cant see how bad it is. Just jack up the motor, and you will probably see the separation.
1993 YJ  6" lift on 35" Goodyear MTR's, 8.8 rear w/ Spartan, Dana 30 w/ Lockrite & 4.10's
1999 Dodge Ram 2500 8.0L V10 Tow Rig

1N73LL1G3NC3 15 7H3 4B1L17Y 70 4D4P7 70 CH4NG3 ~573PH3N H4WK1NG

Offline Johny Pornstash

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Re: YJ Motor Mounts - Brown Dog
« Reply #7 on: February 12, 2015, 08:12:40 PM »
so at 8 years old, it might be time to take a look at Syd's bits and pieces?
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Offline harryhood

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Re: YJ Motor Mounts - Brown Dog
« Reply #8 on: February 12, 2015, 08:21:43 PM »
Did you use the thru bolts from Browndog? I didn't when I put Brown Dog motor mounts, but afterwards I read that you might get less vibes with them.
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Re: YJ Motor Mounts - Brown Dog
« Reply #9 on: February 12, 2015, 08:27:56 PM »
Did you use the thru bolts from Browndog? I didn't when I put Brown Dog motor mounts, but afterwards I read that you might get less vibes with them.

I did not use the Brown dog thru bolts. Not sure how you get less vibration from using their bolts?
1993 YJ  6" lift on 35" Goodyear MTR's, 8.8 rear w/ Spartan, Dana 30 w/ Lockrite & 4.10's
1999 Dodge Ram 2500 8.0L V10 Tow Rig

1N73LL1G3NC3 15 7H3 4B1L17Y 70 4D4P7 70 CH4NG3 ~573PH3N H4WK1NG

Offline bill

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Re: YJ Motor Mounts - Brown Dog
« Reply #10 on: February 13, 2015, 04:42:39 AM »
I was going to get these but I opted for synergy mm, hopefully they are as good as these
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Offline harryhood

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Re: YJ Motor Mounts - Brown Dog
« Reply #11 on: February 13, 2015, 08:43:29 AM »

I did not use the Brown dog thru bolts. Not sure how you get less vibration from using their bolts?

I thought I read it in the instructions for the MM. It had to do with the self-locking nuts allowing you to more easily properly tighten the bolts without over-tightening.
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Offline clean4drxj

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Re: YJ Motor Mounts - Brown Dog
« Reply #12 on: February 16, 2015, 10:07:18 AM »
Browndog makes one of the best setups for jeeps, the engine plates have more bolts and are stronger than stock(obviously), that will be in the plans for down the road.
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