T20 broken mounting bolts

[PlumCrazy]

T20 broken mounting bolts

T20 question!
I have two broken bolts in the T20, previous owner appears to have 'worked' on them but left them un-repaired.

The question is; are these blind 3/8" holes or are they thru bolts from the inside.

[BobW]

I have found them to be 'blind' - they have a bottom to the hole.

[racerone3]

they are blind. a left hand drill and an "easy out" will probablyget you where you need to be, or you can try welding a nut to the remaining section of bolt. this gives you something to turn it by, and the heat from welding causes the steel to expand a bit. when it cools it can brake loose any corrosion. If the threads are hurt, use a helicoil to replace them

[Tomo]

hi
The mounting bolts are broken i assume from vibration .
If not already installed a brace running from the top mounting bolt down to the chassis on a 45 degree angle will help stabalise transmission when under load .

U may need to fill holes with an epoxy filler [eg locktight devcon ] and redrill then helicoil . Helicoils and recoils do come std fitment on some industrial alluminium items .

tomo

[PlumCrazy]

Thanks everyone, got the 1st one out.
.
Used a transfer punch to find the center of the stud, drilled it with a 1/4" bit (the holes are drilled 1-1/8" deep at the factory), filled it with Kroll oil, gave it a little heat from the torch to get the oil boiling, let it sit for an hour, then gave it abit more heat to expand the aluminum, tapped the easy-out in and with the help of a long handle tap 'T' wrench for even pressure, twisted it out. Chased the threads with a tap for good measure.
.
Hope the 2nd one comes out just as easy tomorrow.
.
The unit has the support brackets on each side of the case down to the frame.
Looks like someone broke the bolt, tried to weld a nut on it, failed and gave up
.
ed

[amphibious drew]

Thanks everyone, got the 1st one out.

The unit has the support brackets on each side of the case down to the frame.
Looks like someone broke the bolt, tried to weld a nut on it, failed and gave up
.
ed

I was just out in my garage and had the same problem with the 1st t-20 I put in my Max IV. I snapped 2 of the bolts off in the left side of the tranny. I decided to give the old welding a bolt on trick a try. I used a bolt not a nut, but with a few tack welds both bolts spun out really easily. Mind you my bolts were put in the day before they snapped, but they usually snap when they have loosened up a bit. If the loosening is the cause for the breakage, they should come out easy. At least in theory.