drilled hole in transmission
 

Like the title say, I managed to drill a hole in the transmisson housing.. Now im frustrating and dont know what to do. The hole is about 7 or 8 mm. I used a 13 mm but it did not go all the way thru.

What to do? Can i use som kind of sealing og press something in there. I dont think much metal got in the hole.
Is there any pressure in there?

Re: drilled hole in transmission
 

You need to give more info.What kind of transmission?Where is the Hole?Cast iron or aluminum?And most of all,everyone's going to be curious as to how you did it?

Re: drilled hole in transmission
 

Oh i forgot. Its a 350 automatic. The hole is on the top Ca 380 mm from the engine. Aluminium
I was installing the shifter and was drilling a hole for the shifter wire. Everything happend so fast, to much pressure on the drill maybe...?

Im thinking to press a bolt in with sealing on?

Re: drilled hole in transmission
 

I would say to find someone who can weld aluminum

Re: drilled hole in transmission
 

Is it in the bellhousing part? Or is it back farther than that?

Re: drilled hole in transmission
 

I would use JB weld. After its sets up run it to a tranny shop & ask them.

Re: drilled hole in transmission
 

380mm back from the engine = 15". He's probably past the bellhousing and into the main body.


Once you get the trans out and locate a welder of aluminum, a good fix would be to find aluminum round stock and open the hole to that size (8mm, 10mm...) Cut a piece maybe 50mm long and locate it so that it's just flush with the inside of the casting (no new material extending into the case). Weld the pin to the case, filling up your drilled area and cut the long part of the pin flush with the outside.

If the case is thick enough to cut at least 3 threads, I might drill and tap to M8x 1.0 or even M8x 0.75 and install a short bolt as a plug. JB weld the bolt into place. No welding needed, but not as complete of a fix either.

Re: drilled hole in transmission
 

I would dolike stepsidder said jb weld it see what happens, if it works cheap fix ,if not than theres plenty of turbo 350 out there. good luck

Re: drilled hole in transmission
 

I have used lead ball flattened to the size of the hole "tapped" it into the hole, and for a bit of insurance you could scuff up the outside around the hole and as suggested cover all with some JB Weld.
I may try to open up a larger hole in the sheet metal floor to get a better shot at sealing the opening.
As mentioned you can always find another 350, or R & R and repair!

Re: drilled hole in transmission
 

Screw in a short bolt or screw with teflon tape?

Re: drilled hole in transmission
 

Gents, he is in Norway and may not have easy access to a turbo 350 core to get a case like many of us do here.

Magnus-Stepper the best way to fix it is to replace the case. That isn't hard and if the trans was in great shape would only require a few gaskets and some time. You pull the whole inside assembly out of one case and put it in another.

There probably isn't room on the inside to be able to tap the hole with pipe threads and put a pipe plug in the hole but that would be an option along with driving in a plug like the round one suggested and sealing over it with some epoxy or JB weld.

Another option may be to pull the trans, pull the internals out and have the case welded, touch the inside up with a die grinder, clean it up and reassemble it. I think you can get by with just a front pump gasket and a valve body gasket if you don't disturb anything else. We pulled the drive assembly out of a Buick transmisson and put it in my brother's Chevy transmission one time when he was broke and I had a good Buick turbo 350 laying in the corner getting in the way.

The last time I heard the "drilled the hole in the top' story It was a customer who came in the Pontiac dealership I worked in in Waco, TX bringing a car he had sold a few days before bringing it back because the trans had sprung a leak. Yes sir, the person who had bought the car had drilled a hole through the transmission hump to mount some sort of electronic device and had drilled through the top of the trans case. A new trans case and gasket set for that one.

Re: drilled hole in transmission
 

Ya know there is already vents holes up in that area, all you did was nearly make a new vent. If it ain't puking fluid out stock vent hole...........

Re: drilled hole in transmission
 

I knew a guy who shot a hole in his transmission, but that 30.06 round did considerably more damage than a drill bit would.

Re: drilled hole in transmission
 

JB Weld

Re: drilled hole in transmission
 

Put a sheet metal screw in it with epocy sealer or RTV.

Re: drilled hole in transmission
 

There you go.^^^ easy fix.

Re: drilled hole in transmission
 

JB Weld! There is no pressure on the case.
The best way would be to weld it back up. The second best is to tap it for a pipe fitting. A lead plug would also be a great fix. But, JB weld is cheap and easy and probably be a semi-permanent fix.
What ever you do... MAKE dang sure it does NOT extend past the wall of the case. Critical internal damage will quickly ensue.

Re: drilled hole in transmission
 

If the hole "did not go all the way thru" then I would just fill the hole with JBweld. That stuff is crazy strong.

cheers
JohnG

Re: drilled hole in transmission
 

simple and easy, mixed correctly last a long time!

Re: drilled hole in transmission
 

http://i1253.photobucket.com/albums/...psc0d2a343.jpg

I put a little metale plate in the hole so the sealing wouldnt go down in the transmission. Now it will sit for a few days and dry up!

Re: drilled hole in transmission
 

Mercy, what did you use to cut the floor sheet metal?

Re: drilled hole in transmission
 

Used a pair of bad metal scissors. The metal wil bend down again, no prob

Re: drilled hole in transmission
 

geez brother invest in a good body saw or a cut off tool

Re: drilled hole in transmission
 

not like he drilled 100s of holes close to each other, then used a wire cutter to snip the tiny piece left inbetween. ;)

Re: drilled hole in transmission
 

If it is available in your area, I would recommend some of the thick JB weld epoxy putty
http://www.jbweld.com/product/j-b-steelstik/