Engine Shock Mount Replacement

Skymaster337B · #1 03-08-09, 09:46 PM

Does anyone have any experience changing front engine rubber mounts? My question is: can I get away with not disconnecting everything (oil lines, throttle cables, etc.) by only lifting the engine high enough to remove and replace the rubber mount pads? I heard the bolts will not line-up very well unless the weight of the engine is supported, so are there any trade secrects on replacing the rubber mounts?

John Hoffman · #2 03-09-09, 06:31 PM

Quote:

Originally Posted by Skymaster337B

Does anyone have any experience changing front engine rubber mounts? My question is: can I get away with not disconnecting everything (oil lines, throttle cables, etc.) by only lifting the engine high enough to remove and replace the rubber mount pads? I heard the bolts will not line-up very well unless the weight of the engine is supported, so are there any trade secrects on replacing the rubber mounts?

I had the front mounts replaced at last years annual. It was going to be an easy annual and the A&P could have been looking for extras, not a problem as they were probably the original 1973 mounts. His labor estimate was 4 hrs. and that is what was billed. I did ask how it would go and he said something like - they raise the engine and "slip them in" so I guess you are on the right track. Im sure your a better mechanic than I am but I could have probably found a way to make a mess of the job - was happy to pay the $200 labor. Just an observation I posted on the CPA site last year thinking I would get some response - like how cheap can you be?? and that is that when he handed me the old mounts I could see that there was no damage and that only the one in compression was affected, the other 1/2 was like original -- so -- why not just buy 2 sets and only use the new ones on the compression side?? Good luck with your work.

skymstr02 · #3 03-10-09, 05:47 AM

Yes you can. The only things that I totally disconnected were the mufflers from the "Y" pipes (normal aspirated).

Skymaster337B · #4 03-10-09, 11:30 AM

Thanks for the info. I didn't think about the muffler. Also, what position should the throttles be in? Full forward or full aft? Or leave it in the middle so it can move in either direction?

skymstr02 · #5 03-11-09, 05:46 AM

I had plenty of slack in the throttle, misture and prop cables.. I raised the engine just enough to change out the lower donuts.

Skymaster337B · #6 03-17-09, 10:10 PM

So, how did you keep weight on the nose wheel? Did you put wooden supports on the tail boom?