912UL rubber engine mount replacement

[kl2657]

Has anyone out there replaced the rubber engine mounts on their 912ul installation? I'm in the process and was looking for guidance on how remove/replace the bottom two mounts. Can this be done without removing the engine?

Also, does anyone have any advice on separating the exhaust manifolds from the muffler? Mine is pretty well seized together...

Thanks!

[jrevens]

Mouse Oil is good at freeing seized exhaust pipes. I think it may be available from Aircraft Spruce.

[foxkit3]

Hello. Would like to replace the rubber engine mounts on my 3 with a 912 set up. Were is the best place to but them??

[kl2657]

I purchased mine from Kitfox. I will tell you that it was not a fun job replacing them. I was able to do it without removing the engine. It took removing the rails mounted to the engine one at a time to get enough clearance to slide in the new rubber. Be very careful and patient trying to get the engine mount bolts aligned as you reinstall the mount rails as it is easy to cross thread them.

[airdawg]

Just replaced the isolators in a Speedster with a 912UL. You do not need to remove the engine but it is a painful process. The key is to support the engine and completely remove the engine mount brackets that connect the motor to truss. Work from the isolators towards the front of the motor. Get the isolators in by tipping the brackets up at a 45 degree angle. Then get your bolts in. Then get your next bolt in(this one sucks)and don't forget the washer that goes between the engine block and the bracket. You will definitely need a engine hoist and a second person. Good luck! I would also check the dimension of your spacers to make sure they comply with the Kitfox service bulletin.

[Jesse]

I just resurrected my grandfathers model 5 kitfox as it has sat in his hangar unused for 15 years and have been doing a lot of little work as i keep noticing new items that are needing to be fix/replaced. The most recent being the rubber engine mounts. The 2 upper mounts look fine to me and don't feel hard or appear cracked but he 2 lower ones look to be sagging. This is a picture of one of them. Engine runs normal idols fine at 1800 rpm but wondering if this is cause for replacement. Seams like i fly for an hr then spend a 2 weeks fixing little things and then repeat the process. Anxious to hear what people have to say on this topic. Thanks all!!

[Spook712]

Just changed the engine mounts (Series 5 912ULS).

Not a joyful task but anyhow.
I put the engine on a hoist and lifted it up just enough to free the mounts ( they were sagging a lot ) and changed one at a time.

The mount I got here in Europe (Ulm Technology Silent Block) have a shorter bushing than the ones from 1994 Kitfox. I think I read something about shortening the original ones, but can't find it anymore.

The engine sits now nice and firmly in the mounts, no sagging.

Greets from Germany,
Tuna
IMG_1072.jpgIMG_1073.jpgIMG_1077.jpg

[4Hummer]

I put some pics in this thread: post #37 This is for a model 4
https://teamkitfox.com/Forums/thread...fox-IV-rebuild

Pretty easy if you go about it the right way. Bottom bolts, Remove the 2 bolts (17mm) that connect the engine cradle to the bottom of the engine block, and you can easily slide the bottom bolt right out still in the cradle


Cant seem to be able to cross post images.