stripped bolt on side of motor, help!

spinner37 · 01-02-2010, 02:17 PM

so i was looking under my 77 911 s today. i have no history on the car, but it is the 2.7 with most of the updates done to it. it is leaking oil from behind this nut(see pic) so i put a wrench on it. it is stripped, barely hand tight. anybody know what this bolt/stud is, and is it ok to be stripped? i was going to take the nut off and put threadlocker on, but the stud was kind of wobbley, so i left it for now.

any insight would be awesome! thanks

fastfredracing · 01-02-2010, 02:29 PM

It is a case stud , and it is common for it to pull threads from the case just like head studs. I have not personally tried it, but I think John Walker posted a fix he will do occasionally , which is to remove the stud, and tap the case to 10mm, then just screw in a short bolt with a sealing washer, and violla done. Sounds like a great idea to me. It elimates the stud holding the cases together, but the stud is obviously not doing it's job right now.
The only othere alternative would be to split the case, and timecert.

spinner37 · 01-02-2010, 02:34 PM

ok, i do not want to pull the motor, it seems to be fairly fresh. i can do a search on john walker.....thanks! is it bad to be driven this way? it is parked for the winter, but i must have put 3000 miles on it with it loose.....

spinner37 · 01-02-2010, 07:05 PM

Ttt

Eagledriver · 01-02-2010, 10:28 PM

I believe that is the stud that holds the case together just below the intermediate shaft bearing. Idealy you would want to fix it, but that involves a rebuild. I think the plug idea is probably the way to go. As long as the case holds together it should be ok. This stud should have been timecerted when the engine was rebuilt.

-Andy

spinner37 · 01-03-2010, 06:05 AM

ok, i also read that if it is the threads on the stud to add some washers to get the nut into some good threads.i might try this first. when i loosen the nut, the stud is not solid though, it is kind of wiggley, the stud does not turn though. thanks for the input, the case is tight as far as i can tell....

chrisf · 01-03-2010, 06:35 AM

I'm a little worried!

I also notice that you seem to have some oil around the air deflectors, above your return tubes. I don't think this is very good.

spinner37 · 01-03-2010, 09:49 AM

ok, so i am pretty sure the stud is pulling out of the case. oil pressure is good, and it seems there are some good temparary fixes for this. no problem. what concerns you about the oil on the air deflectors? it is kind of grungy, but not leaking badly....

Walter_Middie · Walter_Middie's Garage

You said you have some upgrades. Was the engine rebuilt and did it include a fix for pulled head studs? Usually the intermediate shaft stud is fixed also, so I'm guessing you have not had this issue fixed. The oil around the cylinder base could be a sign of pulled head studs. When you do your valve adjustments I'd check the head stud nuts to be sure they are not working loose. Once they do start to work loose, it's time for a rebuild that includes fixing the stud pulling issue.

Gunter · Gunter's Garage

+1

spinner37 · 01-03-2010, 11:27 AM

i adjusted the valves and checked all the head studs a few months ago. everything was tight. the motor runs cool, and it was cold outside, so i was not worried about the head studs. i only assume the motor has been done because of all the aftermarket bolts. what and when it was done i have no idea. it has the backdated exhaust, carrera valve covers and chain tensioners and all the emission stuff gone. everything that "should" be done to the 2.7 motor is. it also runs strong with only minor smoke on startup. hopefully this is just the loose case stud with an easy fix.....

Walter_Middie · Walter_Middie's Garage

Mine went to 160K miles before I rebuilt - mainly to address the head studs, but also for low oil pressure. It could have gone farther before the rebuild, but I wanted it for my daily driver and everything that needed rebuilding got rebuilt. That was a couple of years ago, and it is still my daily driver, and runs great.

Keep your eyes on the head studs and keep driving it. If a little oil comes out - no problem - don't worry about it.

spinner37 · 01-03-2010, 11:43 AM

that is what i planned, check the valves and head studs a couple times a year and keep driving it. the odometer reads 52ooo but i am sure it is wrong..... if the seats are original, it might have about 100,000 on it according to seat wear.... i am sure the motor has been opened, just not sure when and what was done. i am hoping to fix the case stud with the bolt trick, and hopefully the head studs are still good

spinner37 · 01-25-2010, 08:15 AM

just and update on this thread. i pulled the loose stud out, and a heli coil came out with it! good news, motor has been rebuilt in the past, bad news is the heli coil came out on th stud. i was not sure if the motor had been opened up, so this gave me some info at least. hopefully the head studs were taken care of also. anyways, i was thinking of jb welding the helicoil on the stud, then jb welding the stud inside the case. i read that this has worked for some others. i was wondering if the hole the stud goes in is dry of oil though?