Front engine ( at trans) mounts

[Wil Ferch]

Friend is removing and re-installing the engine in his late 70's 911 ( 77 Targa). I believe the forward mounts are fairly common and unchanged for a number of model years through the late 80's.

Anyway..he's not sure if the front receivers ( "bosses" ) are buggered-up from a PO's attempt at doing the same thing. What are the consequences and suitable remedies of a buggered-up front mounting boss where the mounting bolts thread-in ???

- Wil

[Eagledriver]

I had this problem a few years ago. My solution was to buy new bolts and install them. They went in better than the "buggered" up bolts so that was the extent of my fix. I suppose you could run a tap up into the treads as well. I wouldn't want to have to try to replace that part.

-Andy

[Wil Ferch]

Thanks.

Still....I'll bump this....

...I guess the question was more along the lines of buggered-up receiver threads. If so...then what are the options ???

- Wil

[efhughes3]

I'd start with running a thread chaser/cleaner in then go with the new bolts. The chasers are not the same as taps in that they dont cut, but clean the threads.

[klaucke]

Wil,

If the threads really are buggered up, it is likely only at the very start of the threads, so I imagine if you just ran a tap through it would clean it up sufficiently, and there would still be plenty of strength left. They are large bolts w/ lots of thread area.

As an aside, when I was reinstalling my engine and tranny, I found those bolts were very difficult to get started. It was the only 'hitch' I encountered. The problem is that the rubber mounts may not line up properly as you try to put the bolts in. I found I had to use a transmission jack on the front of the tranny to push the mounts against the chassis quite firmly, allowing the rubber mounts to deflect a bit so that the holes were co-axial. Then I was able to start the bolts (probably w/ slightly buggered threads) much easier.