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I just ordered two new rear motor mounts from Pelican. In doing my research for replacement, I am left with three questions given the 997.2 model. (Sorry, I am out of town for the holidays and not near my car to check myself.)
1) Underside nut appears to be a torx for the 997.2. Is this true and what size is the torx bit? See the first comment at Pelican's instruction site (Here is the first I heard of the torx nut.) http://www.pelicanparts.com/techarti...eplacement.htm
2) Jacking the engine - Some use the jack directly on the pan distributing the weight with wood, others grab the engine case behind the pan (between pan and muffler pipes). Opinions on this for the 997.2? I don't like the idea of using the oil pan although many do.
3) Bolt and nut torque values. Any one have access to official spec? The values are out there for the 997.1 Lower: 63 ft/lbs, Upper: 25 ft/lbs (I am sure these will be fine) - what about Loctite?
In the projects I've done so far on the 997.2, I am finding just enough variance from the 997.1 to really **** me off during work such as odd bolt sizes and in this case, the torx nut. Any tips are appreciated.
Oh, why am I doing this? 50% entertainment (to feed my neurosis and simple enjoyment of doing this), and 50% logic: 1) I still have an odd clunk in the right rear, the most common side for motor mount wear, noticeable when going over speed bumps that "throw" the car upwards, and 2) the car has 96K miles on it.... motor mounts just don't last that long, so "they" say (enter my neurosis).
Changing the motor mounts is very easy. I used a floor jack and a two foot piece of 2x4 to take the weight off the mounts. The torque values are the same as the 997.1. I tried semi-solid mounts and didn't like them because of droning sounds. I recommend OEM mounts. I can't remember the size of the torx bit. However, it is a pretty common size. Actually it was very easy to use.
To support the engine they say to use a floor jack and the "transmission jack plate of transmission jack V.A.G 1383 A WE 1082 at the oil pan". Sounds like you just need something against the oil pan that spreads the load evenly.
I installed Function First semi-solid mounts earlier this year. The install was easy. It did introduce some NVH which I liked... made the car fell a bit more tactile/less isolated. Never mentioned it to Wifey and she has not commented about it so it passed the "driving Miss Daisy" test. Only thing I'm somewhat concerned(maybe more curious) about is the effect of NVH on the knock sensor which can rob the car of a few ponies. I've only heard that occurring with the solid mounts which have been known to reduce upwards of ~10 HP on the dyno. Just curious if any happened to dyno'd their cars before and after installing semi-solid mounts.
I have a 997.1, I used a scissor jack and a plank of wood. If you are taking out the driver side mount put what ever jack you decide to use on the drivers side of the engine, not the middle of the engine. Since my car originally came out of chicago I replaced all the rusty bolts and nuts with new ones from Porsche. My tale pipes went up about a 1/4 inch on each side after replacing the mounts. Here is a photo of the old and new mounts, the old bolts do look like the have a blue lock tight applied.
Here's are two shots of a stock 997.2 motor mount. First one shows the long recessed torx nut that holds it onto the engine carrier from below... This one is torqued to 60-63 ft/lbs (which should be re-checked 100 miles post-install) 2nd shot shows the part number...
12-25-2015, 01:37 PM
997.2 Motor Mount Questions.
