Automatic tranny - torque converter bolt broke

[koksmen]

Hi All

what would be consequences of attaching torque converter with 5 instead 6 bolts? would it be of balance? or it will have no impact at all?

as i have almost impossible to remove broke bolt in one of that mounting points...

thanks !

 

[DerFuror]

Re: automatic Tranny

I would personally make an effort to drill & extract the broken bolt out of the torque converter mounting hole (especially if attached to a V8 engine flywheel), thereby eliminating any thoughts of consequence regarding rotating machinery under load.

 

[gerryvz]

Re: automatic Tranny

I would personally make an effort to drill & extract the broken bolt out of the torque converter mounting hole (especially if attached to a V8 engine flywheel), thereby eliminating any thoughts of consequence regarding rotating machinery under load.

+1. If you need to, remove the transmission (and torque converter) to extract the broken bolt.

Compromising this vital linkage between the engine and transmission isn't wise.

 

[gsxr]

Re: automatic Tranny

You should be able to extract the torque converter bolt through the window in the oil pan, where they are installed / removed. Might need to use a right-angle drill attachment, and/or remove some parts for better access, but I'd think it's doable.

That said, I don't think it's the end of the world if you have 5 bolts properly installed & torqued, but I'd avoid trips to the redline and wouldn't advice racing the car. You never mentioned if the car in question is a 500E, btw...

 

[koksmen]

i'm sorry the cars is '90 300-24v m104

Thank You for your comments Guys. I have tranny removed. the problem was that one of the bolts was broken. after welding nut to it the thing become one as you can see now i have a problem to drill it even with cobalt drill

the only way now that i can see is to remove (flywheel) bolt it to torque and use it as a guide for drill. and use tap (taper) to recreate helix. (sorry for my english)

 

[modzona]

I have often used a Dremel with hardened steel tool like Dremel partnumber 9903, 9905 or 9910. Easy to get through the hardened metal to make a good center for a drill bit to grab. Also a left handed drill bit is a smart move.

 

[gerryvz]

It's good that you have transmission removed. If I was you, I would just use the hardest drill bit I could find of a large diameter and drill as much of that bolt out as possible, then use other tools to extract what is left. I had to do this not too long ago with an aluminum block drain bolt for an inline-six M104 engine. It was not pretty, and of all the automotive jobs I've ever done, it was probably the one where I came closest to having to actually call in a professional to help. Fortunately with persistence I was able to complete the job.

As an alternative: perhaps "soak" the bolt with a penetrating solvent (we have Kroil and PB Blaster here in the US for this) for a day or at least a few hours. Then use your left-hand bit to try to turn the bolt out.

The best thing you can do is have patience, perseverance/persistence, and don't rush it. If you find your level of frustration is getting high, then stop for the day and pick up the job later on.

 

[Raffaelli]

Not to sound like a hack mechanic, but it will be fine.

A broken flex plate bolt is not really a big deal. If it really bothers you, buy a new converter. They are semi expendable anyway.

Now a broken pressure plate bolt is an absolute no-no. I had to fix another mechanics mistake on that one. Cost a customer a transmission.

 

[koksmen]

Re: automatic Tranny

Ok so i've manage to center flyweel and converter on the car.

upload png

now i need to find. bench drill...

this is engine side of tranny for 303 000 KM it's not bad but entire housing was covered with oil and sand. due to (as i think) head gasket... now engine is a bit of an back angle due to lack of tranny and i see a major oil leak.


image upload

the car itself

free photo upload

and my working post. ;/