Please tell me what has happened here. Car starts fine, am I missing a bolt or has the stud sheared off? What size please.
Isnt it obvious? You are either missing a bolt or you have sheared off a stud.:rofl: Im pretty sure that its a normal M8 x .125 im sure someone will correct me if im wrong> I have had this happen to me as well after over tightening the bolt and stripped the thread in the gearbox. I just drilled out to M10 size and tapped a new thread.
Common problem. SEARCH should find bolt size. Lucky you discovered it before S/M came adrift and buggered the other thread.
Hmm, I didn't think it was a M10 x 1.0 I put a thread gauge one it a while ago and was pretty sure it was M10 x 1.25. I don't know why they didn't use a coarser pitch on those bolts...
It is definately M10x 1.25. Just FYI the only M10x1.0 on the entire car is the power steer pump pivot bolt.
M10x1.25x25 seemed like plenty, casting is threaded, some monkey has over tightened it I guess. I put loads of thread locker to hold it in because I couldn't get any taps or helicoils, seems firm. Also I figured as long as the bolt doesn't fall out it's doing the job because it's mostly in shear, very little torque needed. To do it properly what size shoult it be tapped to? I don't think an M12 would fit through the slot in the S/M.
You're probably right about an M12 not fitting the slot. It should be Heli-coiled to do it properly.:zlove:
Half the problem with these bolts in the bottom hole is that they are actually too short when stock. I have helicoiled dozens of these where the last 10mm of alloy is stripped out. Many times there is more thread deeper down. If the bolt went full depth at the start it would probably survive. Just make sure the new longer bolt dosent protrude into the bell housing too far and foul the flywheel.
