Motor Mount Replacement - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 11-12-2009, 05:07 PM
skoehlke skoehlke is offline
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2002 Chevy TrailBlazer LT
Graphite Metallic 4.2L I6 2WD
Join Date: Feb 2009
Location: Atlanta, GA
Posts: 150
Motor Mount Replacement

I have been tinkering with the idea of changing my own Motor Mounts. However, after reading several posts and checking out a few how-to's the process seems a little more involved than what I may like to get into.

However, while I was inspecting a few posts and inspecting the engine itself, I was wondering if anyone else has ever changed the mounts without taking off the Fan clutch and jacking the enigne up as far as it could go. My question is this. Since there is a top engine mount bracket that bolts to the engine, would it be possible to simply brace the engine, unbolt the top bracket from the engine. Remove the the old MM and replace it with the new one. Put the bracket back on the engine. Put the nut back on the top of the new MM.

Just asking.
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  #2  
Old 11-12-2009, 07:12 PM
ibidu1 ibidu1 is offline
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Envoy Trailblazer GMC Envoy SLT
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I have done it, its pretty easy! Took me a few mins each side.

This is the way I did them

1: secure the car on flat surface
2: unbolt the plastic covering the oil pan
3: Completely unbolt one of the motor mounts, theres a top bolt and a lower bolt. You will need a long extension for both and maybe even a breaker bar.
4: Loosen the opposite side mount, but leave the nuts threaded a bit.
5: Grab a decent jack and a piece of 2x4 or any wood to help protect the oil pan. Slowly start jacking up the oil pan just enough to give you enough room to slide the motor mount out.
6: Slide the new motor mount, making sure to line up the top and lower key holes, and now slowly lower the engine just enough to barely get the nuts on.
7: Do the same for the opposite side motor mount.
8: Carefully lower the engine, and tighten up the motor mount bolts.
9: Bolt back on the oil pan splash gaurd
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Old 11-12-2009, 09:06 PM
skoehlke skoehlke is offline
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2002 Chevy TrailBlazer LT
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Join Date: Feb 2009
Location: Atlanta, GA
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Clarification

When I was researching this, some other posts stated that they had to remove the fan clutch to have enough room to jack up the engine to remove the old mounts and install the new ones.

Based on what you have written, you did not do any of that. Obviously you had plenty of room to install your new ones. Would that be correct?
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  #4  
Old 11-12-2009, 09:13 PM
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Joe92T Joe92T is offline
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2002 Chevy TrailBlazer LT
Light Pewter Metallic 4.2L I6 4X4
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Location: New Hampshire
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just poly it!
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  #5  
Old 11-12-2009, 09:41 PM
ibidu1 ibidu1 is offline
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Quote:
Originally Posted by skoehlke View Post
When I was researching this, some other posts stated that they had to remove the fan clutch to have enough room to jack up the engine to remove the old mounts and install the new ones.

Based on what you have written, you did not do any of that. Obviously you had plenty of room to install your new ones. Would that be correct?
I didnt have any problems the way I did it. I would replace both front mounts, theres no need really to do the rear transmission mount
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  #6  
Old 01-23-2011, 08:20 AM
CrrazyChicken CrrazyChicken is offline
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2005 GMC Envoy SLT
Graystone Metallic 4.2L I6 2WD
Join Date: Jan 2011
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Thanks for the quick instructions

This procedure worked for me no other items had to be removed, I think the important part was leaving one slightly bolted while replacing the other one so the engine rotates a bit instead of going straight up leaving a bit more clearence room for the middle of the engine (fan shroud, throttle body) which is the limiting factor on jacking the engine up.

Compared to my old 99 Jimmy this was heavenly
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  #7  
Old 01-31-2011, 08:56 AM
kap142 kap142 is offline
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2002 Chevy TrailBlazer LT
Majestic Red Metallic 4.2L I6 2WD
Join Date: Aug 2010
Location: Auburndale, FL
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I have to give a pat on the back to several folks here on the forum.

I had what I originally preceived as a "miss" or rough idle in the motor of my 02 TB. She had right at 100,000 miles so I did the usual (as suggested here) like new Delco plugs, trans fluid and filter, cleaning of the throttle body and such, "roughness" persisted then I began listening to what Roadie. ibidu1, and several other members were saying about motor mounts. Well yesterday I installed my new GM motor mounts and just daummmm. Feels like I'm driving a brand new vehicle. Smooth as silk. New mounts made a world of difference.

Thanks guys.
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  #8  
Old 02-16-2011, 03:13 PM
jwkenion jwkenion is offline
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2003 GMC Envoy SLE XL
Summit White 4.2L I6 2WD
Join Date: Sep 2010
Location: newark,De
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motor mounts

thank you all for the tips on replacing the mounts! my 03 envoy feels like a brand new truck thanks
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  #9  
Old 02-23-2011, 12:30 PM
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Trailblaze_2002 Trailblaze_2002 is offline
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2002 Chevy TrailBlazer LT
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Join Date: Oct 2009
Location: Kentucky
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Never Again! This is the worst **** i have ever done didn't unhook anything but had a helluva time gettin the new mounts in cause the old ones were so compressed! I'll tell ya if it weren't for my bench grinder i'd be majorly pissed lol. The new ones needed at least another 1/4 inch to go in. Managed to get them in by grinding a lil over a 1/4 inch off the new ones. Which was easy cause they have about a 1/2 inch of non threaded portion thank god! But finally got em on there and hope i never have to do it again seeing as i'm at 225,000 miles right now. Runs smooth as silk now! Next goes the Exhaust manifold and gasket....Sighs!


Just a reminder: It won't hurt to GRIND SOME OFF! Save yourself some trouble and if it won't fit GRIND GRIND GRIND! That's my advice for the day lol!
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  #10  
Old 02-26-2011, 04:23 PM
EnVoYNORCAL EnVoYNORCAL is offline
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2002 GMC Envoy SLT
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I just received my motor mounts from GMC part direct. Man those things are not cheap, looks like a big ball of rubber. Anyway, I'm getting ready to mount those in a few days. Idle is super rough, my headliner adhesive detached from the roof and now makes a racket! At least I get a massage during idle. Thought cleaning throttle body and installing new plugs would take care of it but no.
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