Anybody know if it's possible to swap a M46 into the last few years of 940? Mechanically I can't see how it would be any worse than any other auto-to-manual swap as long as one had a donor car. But I'm a little clueless about the computers. Would I need to do anything special to make it run properly? Thanks for any input.

Tim
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Tim Smith '85 745GLE M46 w/90k. Also in the family: 94 854T w/120K.

Just bought a '94 940T earlier this year as a non runner. The P.O. had the misfortune of loosing his coolant, and fried the engine. I dropped in another engine block and have been driving it without any problems.

While doing the engine swap, I looked at what it would take to convert from a slush box to a M46. Assuming you have a donor car, most of the parts I think will transfer easily. Things like the tranny, cross member, drive shaft, clutch master cylinder, etc. should be pretty straight forward. This assumes Volvo did not make any changes in the frame members between the 740 and 940 series. (BTW, chances are you will have to work with relatively early 740s since M46 trannies became rarer as the series progressed. I think after about '88, 740s with M46 were not sold in the states.) The wiring for the OD will take a little thought, but I hear it is not too bad as long and you have the proper relay and know how the wiring for the slush box OD relay was set up. As for the engine interface, I see two issues. The 940s used LH 2.4 which has a crank position sensor poking through the top of the bell housing. My '87 740T with M46 used LH 2.2 which does not have this part. I can't remember if the bell housing on my tranny has allowences for this sensor. The other issue is the fly wheel. The 940 fly wheen has what amounts to an encoder wheel attached to it for the crank position sensor. You will need to find a standard transmission fly wheel with this encoder wheel attached. Since 940s with M46 may not have been exported to this country, this could be a difficult item to find. You may have to search around Europe for this. As for the computer, I think you may be OK. I have both a '87 and '88 740Ts, one with a slush box, and the other with M46. Both cars run with LH 2.2, and both cars have the same computer part number. Maybe the different trannies would benefit from slight different control curves in the computers, but the fact that both of my cars have the same part numbers for the computers suggests the differences are not worth stocking different computers.

Hope this helps. I too would like to someday convert my 940 to a M46.

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Gary D

The required flywheel will be found an a 1990 or 1991 740T in the North America. LH 2.4 was introduced in 1990 on the North American turbo cars, and 1991 was the last year for the M46 in North America. By 1987 (mayber earlier)the M46 bell housing is made with the notch for the RPM sensor. All you have to do is knock out the thin layer of aluminum there.

You are correct, it is a bolt in conversion. I have done two.

I am not an expert on this, but posted the same question about one month ago. I plan on doing the same conversion. The transmission in the 940's is not electronic, so the engine has no idea what is going on. Everything will work OK, but we will need a new flywheel. The trim around the shifter will not fit since the 700s and 900s have a different design, but I figure that I can rig up something.

Impressive - only 90K on your '85! That M46 should have lots of life left.

-Steve
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1986 745 w/ M46 200K since new, 1995 965 104K

Thanks for the reply.

Yeah, it's a pretty solid transmission. I had problems with the OD a few years ago but I managed to fix it. Unfortunately the car took a hit last week and I'm still debating whether to dump more money into it or start over with something newer. The main problem with getting a newer car is that it's going to be next to impossible to find one with a stick.

Incidentally, what's the issue with the flywheel? Do you happen to know what we would need?

Re flywheel: I think that they changed the bolt pattern on the newer engines. Check out my earlier post of March 28 - search for "slong M46" and you will find it. There are replies from many knowledgeable people.

I am getting my 740 all fixed up and it is running better than it ever has in the last 15 years - thanks to the Brickboard. I don't know if I'll ever want to give it up. But a M46 in a 940 turbo would be great. -- someday.

-Steve

Ahh...there it is. I looked for your previous post earlier but I used the wrong search tool. (One only goex back 30 days.) Thanks for the help...it looks like I'm pretty much covered.

Tim
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Tim Smith '85 745GLE M46 w/90k. Also in the family: 94 854T w/120K.

The shifter design is the same on the 700 and 900, any cover from any manual 700 will fit perfectly.
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George Holmer, Belgium, Europe, 1987 745 GLE Turbo Diesel Intercooler (D24TIC/ZF22) 200k; 1988 745 Turbo Intercooler (B230ET/M46) 290k; 1988 745 GL (B200E/M47) 190k