CJWessing

Hey everyone,

I've only had my Porsche a few months, and have done a few simple jobs on it (brakes, 997 shifter) which have been fun and satisfying. Thought I'd take a stab at doing the motor mounts because it looked easy and everyone loved the results. Used GeorgeCo's instructions which were great.

Had a bit of trouble getting the car high enough to fit my jack stands under the rear jack points, trick was to use floor jack at point behind engine and Porsche jack at front jack point, then could slide jack stand under rear jack point.

Finally got it jacked up and started pulling items out, got the right motor mount out no problem and dropped in the new one. While torquing down the top bolts to 25 ft-lbs, one of them broke leaving half of it still in the hole. After looking under the car I realized I missed the hole on the engine flange with big bolt, cocking the mount which I think caused the break. This frustrated me, but I figured I may still be able to drive the car carefully to the dealership to have them pull the broken bolt out.

Then I moved on to the left motor mount, put in the new one, and while trying to tighten the back bolt, either my wrench or the moving the secondary air box hit a coolant line in the middle of the bay and it snapped off squirting coolant everywhere. I felt like I barely touched it, the plastic inside the tube is very brittle, I guess due to age.

Questions:
1. Should I attempt to tap and pull the broken bolt out myself? Never done anything like that and a bit worried I might make it worse. If so, happen to know the part number for a new bolt?
2. Know the part no. for the plastic coolant line connector in the photo? Looks like I just undo one bolt and may be an easy fix to pop in a new connector (if I don't have to remove any belts to get to it)
3. Is it OK to start the car to move it? It has one broken motor mount bolt and a broken coolant line. Right now its blocking my other car (poor planning)
4. Will I have to flush the coolant now that I have air in the system?

I'm debating whether I should try to fix myself or just have it towed to the dealer to have it fixed.

Thanks for your help!
Chris
2002 Porsche 911 Targa, 80k miles

Imo000

Don't feel bad hat coolant connector can snap very easily. You need to plug the end or else coolant will be pumped out when you restart the engine. I replaced mine with a brass one from Home Depot. It will last forever.

Does any of the broken bolt sticking out? You should be ok driving it to a shop bug the coolant coupler will first need to be replaced.

Imo000

Don't feel bad hat coolant connector can snap very easily. You need to plug the end or else coolant will be pumped out when you restart the engine. I replaced mine with a brass one from Home Depot. It will last forever.

Does any of the broken bolt sticking out? You should be ok driving it to a shop bug the coolant coupler will first need to be replaced.

CJWessing

Thanks, makes me feel like I'm not a total dumbass...

Happen to know the part number from Home Depot or the size of the coolant hose? Is it ok that there will be some air in the coolant system? Will it work its way out?

Thanks!
Chris

Nutty Professor

Porsche part # for bolt - 90037805509 (old #), 90037805501 (new #). It's 8x40.

I broke the same coolant fitting. Very common to break as they become brittle. Porsche dealers have these in stock. If memory serves me correctly, the part # is stamped on the plastic fitting itself. Pull off the whole fitting and check for the #.

CJWessing

Found some part numbers:
13mm bolt for motor mount - 900 378 055 09 - hexagon-head bolt (replaced by G90037805501, $9)
Coolant system connector - A 996 106 226 51, or 996 106 226 52 - joining socket ($6)

Gonzo911

Krazy K could have done that for you with a matchstick and a pair of tweezers.

Imo000

3/8 brass. Have a look at my repair page, scroll down and you'll see the picture. https://rennlist.com/forums/rennlist...-these-15.html.

pfbz

You'll have to remove the remaining bolts and motor mount to get to the broken bolt, but it looks like access is pretty decent. Very good chance it will come out easily, often with just a left-hand drill bit. If not a screw extractor (which needs the bolt drilled anyway) will usually get it out.

Also try and use a center-punch on the bolt before drilling to keep the bit centered properly on the bolt.

CJWessing

Great recommendation on the 3/8" brass coupler and drilling out the original mount. Got the coolant line fixed, tomorrow we'll see if I can get that broken bolt out.

Picked up some M8-1.25x40mm Class 10.9 hex head cap screws at the auto store, anyone know if that's an acceptable replacement for the stock bolt? I believe its stainless steel, said it's for high tension use such as engine, suspension, etc.

Stock part:
"Porsche part # for bolt - 90037805509 (old #), 90037805501 (new #). It's 8x40."

Thanks,
Chris

KrazyK

CJ,
You will see two things you need in this photo of my spare parts stash. The bolts in pic are Porsche bolts, not off the shelf. If your not in a terrible hurry, I can drop in mail monday.

CJWessing

Thanks KrazyK, but I've already got the parts on order.

CJWessing

BTW, throttle response seems much better, and engine seems to run much smoother with the new motor mounts.

CJWessing

Victory!

Felt soooo good to see that bolt coming out, this weekend has been a roller coaster of emotions...

halik

nice!