Engine Mounts Failing

[Jaredjeandron]

I have a 2010 Silverado 1500 LS with the 4.8L V8 Flex and in August 2016 the driver side motor mount busted. I replaced it with a Duralast replacement which has the same design as the stock mount (basically rubber glued to metal) and it busted again under low temperature conditions. I have been told to replace it with a "solid mount" and can't seem to find a brand that makes one. Help would be really appreciated if anyone has had these issues before. Thanks!

 

 

Jared Jeandron

[dkjbama]

I can't say I've heard of this being common problem on these trucks. Rubber motor mounts have been around a long time and are pretty much perfected, at least for use on a stock motor.

 

If you want metal mounts, the guy in this thread is trying to get some made up for a group buy. He is running forced induction on a 6.2 though so I could see the need in his application. http://www.gm-trucks.com/forums/topic/194582-solid-motor-mounts-gmt900-2007-2013-interest/

[dkjbama]

Thinking about it. Something else has got to be wrong; perhaps a misalignment of the drivetrain. Is the transmission attached securely to the crossmember? My 5.3 truck is tuned and I am known to romp on it pretty regularly. In 8 years, I've had no problems, and neither have a lot of people.

 

You shouldn't be breaking motor mounts on a stock 4.8. It's not like its THAT cold in Texas.

[Nanotech Environmental]

I have a 2010 Silverado 1500 LS with the 4.8L V8 Flex and in August 2016 the driver side motor mount busted. I replaced it with a Duralast replacement which has the same design as the stock mount (basically rubber glued to metal) and it busted again under low temperature conditions. I have been told to replace it with a "solid mount" and can't seem to find a brand that makes one. Help would be really appreciated if anyone has had these issues before. Thanks!

 

 

Jared Jeandron

These trucks are definitely not known for those types of failures. If you've had 2 in a row break, I'd suggest there may be something else going on that's putting extra stress on the drivers side mount.......

[Jaredjeandron]

Thinking about it. Something else has got to be wrong; perhaps a misalignment of the drivetrain. Is the transmission attached securely to the crossmember? My 5.3 truck is tuned and I am known to romp on it pretty regularly. In 8 years, I've had no problems, and neither have a lot of people.

 

You shouldn't be breaking motor mounts on a stock 4.8. It's not like its THAT cold in Texas.

[Jaredjeandron]

I can see where that might be an issue however I thoroughly inspected the tranny mount when I replaced the motor mount. Also when the new mount was put in, the average high temp was 101 in northeast Texas add engine heat and it probably was no higher than 220 but the lowest temp last Friday night dropped below 10 degrees and I hadn't warmed up the engine before driving it several times, plus it's a Duralast brand mount. I literally got the cheapest one I could find, rubber glued to metal.

[dkjbama]

Well, the GM mount lasted at least six, if not seven years. The duralast mount lasted 5 months. Maybe try another GM mount.

 

Yes, 10 degrees is cold for us, but it's downright balmy for those unfortunate souls up in the great white north and they drive these trucks too. If cold weather was a problem for them, I'd think we would have heard of this by now.

 

I just think solid mounts are overkill for a stock daily driver. If you don't have the rubber mounts to flex, then the stress and vibration has to go somewhere, in this case, the welds on the perches on the frame will be taking the abuse. That not even counting the increased NVH (Noise, Vibration, Harshness) that would come with solid mounts.

 

Do what you want. Just adding my two cents.

[Jaredjeandron]

Well, the GM mount lasted at least six, if not seven years. The duralast mount lasted 5 months. Maybe try another GM mount.

 

Yes, 10 degrees is cold for us, but it's downright balmy for those unfortunate souls up in the great white north and they drive these trucks too. If cold weather was a problem for them, I'd think we would have heard of this by now.

 

I just think solid mounts are overkill for a stock daily driver. If you don't have the rubber mounts to flex, then the stress and vibration has to go somewhere, in this case, the welds on the perches on the frame will be taking the abuse. That not even counting the increased NVH (Noise, Vibration, Harshness) that would come with solid mounts.

 

Do what you want. Just adding my two cents.

[Jaredjeandron]

I totally get it, and I do definitely appreciate your input. I may try getting an AC Delco mount for now. And do you happen to know anything about energy suspension polyurethane motor mounts? I have tried to navigate their website on my phone and it is just as difficult as trying to find a perfect motor mount.

[dkjbama]

Sorry I don't know anything about the poly mounts. My days of anything more than simple mods were over more than a decade ago. My guess is they would fall in between stock rubber and solid metal in both strength and NVH.

[dkjbama]

Any chance the transmission crossmember is bent from a misadventure off-road?

[muddkatt]

Duralast is junk, put a Delco mount back on it.

[redvett]

You might want to put a cable from exhaust manifold to frame and tighten it until there is a slight slack in the cable. This will allow engine only to move slightly as needed and you still have the isolation of the rubber mount.

[Silverado4x4]

You might want to put a cable from exhaust manifold to frame and tighten it until there is a slight slack in the cable. This will allow engine only to move slightly as needed and you still have the isolation of the rubber mount.

 

And snap the exhaust manifold bolts off.

[redvett]

I used that method when I was racing Corvettes on road courses and never broke any manifold bolts. Of course you could always attach to the accessory holes at front of head,