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Transmission Sump Drain bolt Thread for 1993 940

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zimbodel
Posts: 23
Joined: Sun Jul 26, 2020 5:41 pm
Year and Model: 1993 940
Location: USA

Transmission Sump Drain bolt Thread for 1993 940

Post by zimbodel »

I noticed the drain bolt on my transmission sump is stripped.

The pan thread looks good.
I tried some taps in the sump to figure what the thread is but it is seemingly not metric!
Being a volvo I expected metric.
I dont have SAE taps here as all my cars are metric.

The thread seems to be a 3/8 by something.

Anyone know what the thread is for a 1993 940 with AW70/71 xmission?
I want the official thread for the transmission sump so I can get the correct tap and clean it up then install a new bolt.


thanks
jimmy57
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Re: Transmission Sump Drain bolt Thread for 1993 940

Post by jimmy57 »

I'm pretty sure it is metric but it is Japanese metric. Most tap sets will have 10mm 1.5 taps and 10mm 1.0 but not the 10mm 1.25 that JIS engineering standards in use on asian makes. You may not have enough metal to repair it by cleaning it with a tap. You could go to a 7/16 fine thread tap and get a 1/2 long bolt with that thread. Copper or aluminum seal washer will seal it. You need to take the pan off to do this as the metal shavings shouldn't be left to be collected by the magnet as they may go other places before the magnet attracts them.
zimbodel
Posts: 23
Joined: Sun Jul 26, 2020 5:41 pm
Year and Model: 1993 940
Location: USA

Re: Transmission Sump Drain bolt Thread for 1993 940

Post by zimbodel »

I really appreciate this. Would be great just use the old thread if the pan is not stripped. I already have it off. Just have to clean it.
My Metric Tap and Die set has M10 x 1.25, but as you can guess, that tap is missing as I used it a lot for non-car jobs. and must be somewhere misplaced where I left it. BAAAD Habit.
Best is I rethread it to 12mm x 1.25 which I have a tap for as the threads are a bit damaged.

So many mess-ups I find since I service my own cars now. Its a wonder they still go.
This volvo was leaking transmission fluid. Now I know why. Dangerous if it came out.
zimbodel
Posts: 23
Joined: Sun Jul 26, 2020 5:41 pm
Year and Model: 1993 940
Location: USA

Re: Transmission Sump Drain bolt Thread for 1993 940

Post by zimbodel »

jimmy57, right on the money thanks.
It turned out to be exactly an M10 x 1.25

Went to Autozone and Advance Auto, They have any sump bolt available except .. you guessed it .. M10 x 1.25
So I ent to home depot, go two M10x1.25 bolts.
The bolt had casted spines on the inside surface which would not work and will leak, so I put it in my lathe and machined the flange smooth and cut the threaded part length down to size with a parting tool.

I now have to order an aluminum bolt with magnetic tip as the stupid auto shops do not stock any parts I need I learned.
The Steel bolt works great until I get the aluminum bolt.

Aluminum bolt is just a great idea as you dont ever want to strip the threads in the pan and rather snap the bolt.

Thanks you solved it for me before I had to rethread it.
As Murphy's law dictates my 1.25 tap is somewhere mislaid from the box set just when I need it the most, so I had to buy another. With your info, at least I could go buy the tap and clean the threads knowing what the thread is.

Thanks a lot.
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