Broken Motor Mounts

[NGAneer]

Mine was two 2x4s (should have been three) under the sump

 

[iamdub]

The cast LS pans are actually a structural part of the bottom end of the engine, so it's pretty strong. I doubt they engineered it intentionally to support the engine with a jack on the bottom, but it's obviously fine as long as the load is spread out.

 

[Meccanoble]

I also used a standard harbor freight 2 ton jack with wood on top on the rear of oil pan. On the 4X4, there isnt much room elsewhere on the oil pan to jack the engine up. The wood is more to brace the impact as contact with jack could bend, dent, or puncture hole.

 

[iamdub]

There are some solid and flat points on the bottom of the block on each side that can be used for lifting the motor. They're kinda small, but if you're doing one side at a time this shouldn't be a problem. Either way, you should only be lifting it just what's necessary.

 

[techbiker]

There are some solid and flat points on the bottom of the block on each side that can be used for lifting the motor. They're kinda small, but if you're doing one side at a time this shouldn't be a problem. Either way, you should only be lifting it just what's necessary.

Great info! I am always cautious around oil pans. My 300zx oil pan is made of thin stamped metal and can be dented by road debris. If you look at a 300zx OEM oil pan the wrong way, it will probably cave in lol.

 

[swat2380]

I'm going to tackle this soon and plan on doing both at the same time. Been thinking that if one is bad the good mount has been flexing more than it should. That will probably shorten the life of the other which likely already has more "play" than it should supporting a bad mount. In turn this will make the new one work harder from the start and so on. This is all in theory but it makes sense in my head. May as well do the trans mount while I'm at it too

 

[Rocket Man]

I'm going to tackle this soon and plan on doing both at the same time. Been thinking that if one is bad the good mount has been flexing more than it should. That will probably shorten the life of the other which likely already has more "play" than it should supporting a bad mount. In turn this will make the new one work harder from the start and so on. This is all in theory but it makes sense in my head. May as well do the trans mount while I'm at it too

You might rethink that after doing one from what I've heard about how much fun they are. You know what they say, if it ain't broke...

 

[swat2380]

You might rethink that after doing one from what I've heard about how much fun they are. You know what they say, if it ain't broke...

Haha yes true but once and hopefully done for a while also sounds good

 

[08HoeCD]

The driver side mount suffers from being stretched during the engine’s power stroke whereas the passenger side mount experiences compression; thus, the driver side mount seems to fail earlier and more frequently than does the passenger side mount.

 

[Rocket Man]

The driver side mount suffers from being stretched during the engine’s power stroke whereas the passenger side mount experiences compression; thus, the driver side mount seems to fail earlier and more frequently than does the passenger side mount.

Yeah I've literally never heard of the passenger side going bad. I suppose it's possible but unlikely.