Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

considering replacing motor mounts...


  • Please log in to reply
10 replies to this topic

#1 mwatt

mwatt

    Subaru Fanatic!

  • Members
  • 380 posts
  • Rockville

Posted 19 September 2006 - 10:57 AM

I'm considering replacing the motor mounts on my wife's '98 Outback LTD (128K miles). I want to do that with the hope that it will solve the throbbing/vibrating from the engine at idle in "D" (NOT a misfire). The vibration stops if you shift to nuetral. Have any of you replaced engine mounts on one of these? Can I simply use my neighbor's engine hoist to lift the engine very slightly and unbolt the mounts or is there more to this than meets the eye? I also noticed in previous posts that the engine "dog-bone" (pitch stopper) can cause vibration if its bushings are worn. Anyone had success in correcting idle vibration by replacing the pitch stopper?

#2 Legacy777

Legacy777

    Moderator

  • Moderator
  • 12,630 posts
  • Houston, Tx

Posted 19 September 2006 - 12:49 PM

Unless the mounts are ripped or broken, I don't think replacing them will cause any difference.

Regarding the pitch stop mount. I didn't see any difference in how the car operated with or without it installed.

#3 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 19,889 posts
  • WV

Posted 19 September 2006 - 12:53 PM

i agree, doubtful those mounts will solve your issues.

#4 jamal

jamal

    1000+ Super USER!

  • Members
  • 1,015 posts
  • Los Angeles

Posted 19 September 2006 - 01:26 PM

My car vibrates a bit more than usual when the ATF is low. Have you checked that?

#5 wondercow2

wondercow2

    USMB Regular

  • Members
  • PipPipPip
  • 118 posts
  • Houghton, MI

Posted 19 September 2006 - 03:53 PM

Mounts are pretty durable, and your main culprit may be elsewhere (a bad sensor or combination of sensors resulting in a poor idle when the car is in drive?), but replacing the mounts can still be a good idea. Rubber gets very hard as it ages and dries out. The mounts are expensive enough that you probably don't want to replace them on a whim though.

#6 jamal

jamal

    1000+ Super USER!

  • Members
  • 1,015 posts
  • Los Angeles

Posted 19 September 2006 - 04:14 PM

You can get a lightly used set from someone who swapped to group N mounts on the cheap (like $40 at most). I have those liquid filled ones and they're pretty soft. I plan to replace them one of these days.

#7 Commuter

Commuter

    Subaru Master

  • Members
  • 1,857 posts
  • Niagara area, Ont Canada

Posted 20 September 2006 - 11:47 AM

Did you have a front half shaft replaced recently?

I had the same vibration issue crop up after a half shaft replacement last year. They changed it out under warrantly. It's much better, but not as good as it orginally was. The other side was changed recently and again, the vibration went up a bit. Overall, it is still (barely) acceptable to me, so I'm living with it. I don't want to take the chance of having them replace it and it gets worse. Just why this happens, and what is the cause, no one really seems to know.

When I had engine work done 4.5 years ago, I had them put in the newer liquid filled mounts. I had changed to a light weight crank pulley shortly before the engine work and the vibration had gone up some. The liquid filled mounts quelled most of it. Personally, I didn't care about engine rock, snappy take offs etc. (the reason for the harder mounts). Heck, it's a 97 auto Outback! :-\

Commuter

#8 mwatt

mwatt

    Subaru Fanatic!

  • Members
  • 380 posts
  • Rockville

Posted 21 September 2006 - 08:56 AM

Did you have a front half shaft replaced recently?

I had the same vibration issue crop up after a half shaft replacement last year. They changed it out under warrantly. It's much better, but not as good as it orginally was. The other side was changed recently and again, the vibration went up a bit. Overall, it is still (barely) acceptable to me, so I'm living with it. I don't want to take the chance of having them replace it and it gets worse. Just why this happens, and what is the cause, no one really seems to know.

When I had engine work done 4.5 years ago, I had them put in the newer liquid filled mounts. I had changed to a light weight crank pulley shortly before the engine work and the vibration had gone up some. The liquid filled mounts quelled most of it. Personally, I didn't care about engine rock, snappy take offs etc. (the reason for the harder mounts). Heck, it's a 97 auto Outback! :-\

Commuter


Yes, I did. Back in December '05 I replaced both axle shafts with Subaru reman parts (got them from Jason at 1stSubaruparts/Auburn Subaru). And before I did the job I knew about the possibility of a replacement axle shaft being a different length from the original might cause "vibration" at idle---so I carefully measured the replacement shafts against the originals and they appeared to be exact.
You know the kind of vibration I'm referring to, right? You can feel the engine "throbbing" thru the car as if the engine was sitting right on the cross-member. As soon as you blip the idle up a bit or shift to "N", it's gone. Looking under the car, the motor mounts appear to be fine. but I know that doesn't mean much. Hell, maybe I'll just cheat a little and adjust the "minimum idle speed" stop screw on the throttle body......

#9 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,587 posts
  • Long Island NY

Posted 21 September 2006 - 09:34 AM

I'm considering replacing the motor mounts on my wife's '98 Outback LTD (128K miles). I want to do that with the hope that it will solve the throbbing/vibrating from the engine at idle in "D" (NOT a misfire). The vibration stops if you shift to nuetral. Have any of you replaced engine mounts on one of these? Can I simply use my neighbor's engine hoist to lift the engine very slightly and unbolt the mounts or is there more to this than meets the eye? I also noticed in previous posts that the engine "dog-bone" (pitch stopper) can cause vibration if its bushings are worn. Anyone had success in correcting idle vibration by replacing the pitch stopper?


inspect the tranny mount. it seems if there is a mount to go bad thats the mount. i had a vibration in drive, then the tranny mount was replaced (when i had the awd unit replaced) and the vibration went away. Also make sure all the exhaust hangers are tight and functioning.

nipper

#10 2X2KOB

2X2KOB

    Subaru Fanatic!

  • Members
  • 393 posts
  • Midstate MO

Posted 21 September 2006 - 10:44 AM

maybe I'll just cheat a little and adjust the "minimum idle speed" stop screw on the throttle body......


Your engine management system will not appreciate this. This is not how the idle speed is determined.

#11 Commuter

Commuter

    Subaru Master

  • Members
  • 1,857 posts
  • Niagara area, Ont Canada

Posted 21 September 2006 - 12:19 PM

Yes, I did. Back in December '05 I replaced both axle shafts with Subaru reman parts (got them from Jason at 1stSubaruparts/Auburn Subaru). And before I did the job I knew about the possibility of a replacement axle shaft being a different length from the original might cause "vibration" at idle---so I carefully measured the replacement shafts against the originals and they appeared to be exact.
You know the kind of vibration I'm referring to, right? You can feel the engine "throbbing" thru the car as if the engine was sitting right on the cross-member. As soon as you blip the idle up a bit or shift to "N", it's gone. Looking under the car, the motor mounts appear to be fine. but I know that doesn't mean much. Hell, maybe I'll just cheat a little and adjust the "minimum idle speed" stop screw on the throttle body......

It's not just a length issue. For some reason, this "happens". It makes no sense that the vibration would occur when sitting still and go away when moving, but that is what happens. My dealer installed the half shaft and yes, it was a Subaru remanufactured unit.

It sounds like you did the work yourself, so you can't go back on a warranty. You could try pulling the half shaft and rotating it 180 degrees on the spline. Lots of work, but I seem to recall reading a post years ago where this worked.

Other than that, I don't have much to offer you. I find the vibration is not consistent. Almost none at times, noticable at others. I do shift in N on occasion if it is bugging me. Such a wonderful Subaru quirk...:-\

Commuter




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users