Hey everyone, earlier this evening I went to change my engine mounts to the RSS mounts from the factory ones. My car is a 997.2 2009 carrera S. I followed instructions from other threads and put the Jack under the oil pan and lifted the jack till it was snug against the oil pan, then I opened the bottom bottom nut from under the car on the driver side while the passenger side mount was completely in place and bolted tight( I read it's better to do one at a time so engine doesnt fall out of alignment with mounting points), once I took the bottom torx nut out I heard a decently loud thump or bang, and I noticed the engine carrier where it attaches to the bottom of the motor mount has dropped down about 1", so I immediately jacked up and took of the top two motor mount bolts and took the motor mount out and replaced it with the RSS mount, wiggled it a bit and everything lined up and jacked up the oil pan more and tighten and torqued the top bolts and the bottom nut. Then I moved to the other side, this time I jacked up the oil pan alot more not like the first time just lifting the jack snug against the oil pan, I took off the bottom nut and top bolts swapped the mount and torqued everything and lowered the jack. Took the car for a drive and everything was lovely. I'm just concerned about that bang that I heard and and the fact that the engie carrier was dropped about an inch on the driver side when I took the mount off. Is that something to be concerned about? I think the noise was from the carrier slipping over the motor mounts bottom portion long bolt. Am I right?
Now the next question is that if you were to take out both motor mounts without supporting the engine from underneath would that damage anything? Would it bend and brackets or anything in the PDK transmission area that's behind the engine? Because my understanding is that even if both motor mounts our out the engine is still attached to the body via trans mount and other points. Any how just concerned if I could have damaged anything when it dropped on the passenger side by about an 1". Thank you so much in advance.

 

It's possible that the noise was from where you suspect. You should be lifting the engine high enough where it's not hanging on the mount bolt when you get ready to finish removing it from the mount, essentially removing all the load, like it sounds like yiu did on the other side. Make sure the noise you heard wasn't the oil pan getting a hairline crack when it fell that inch.

No, I don't believe you can take both motor mount bolts out at the same time without supporting the engine and that you'll damage the transmission mounts or bend the reinforcement bars that go to the lower cross member.

 

You should be fine. I heard the same noise when I did mine. It was from not having the engine high enough. If you removed the mount bolts with supporting the engine, it would fall. Maybe not completely as the motor is connected to the transmission, but it would not be pretty... Especially if you were under the car.

 

Thank you very much. The oil pan is fine, I checked it, the jack was under the oil pan amd was touching it snug so It wouldnt have been possible for the engine to drop an inch because the jack was holding the oil pan before opening any bolts or anything. So I think the engine carrier may have had some load and that's what dropped a bit. Because if the engine dropped an inch the oil pan would have had a big hole in it or the jack would have been lowered by the force but neither happened. Thank you again.

I think that's exactly the issue, I didn't have the engine lifted, I was just supporting it and I belive there was load on the carrier. Because the other side once the engine was supported I lifted it an inch from the support point and no noise or anything. Thank you.