722 - Cooler Line Bolt Torque Spec

[Richard Howard]

I'm finishing installing a rebuilt 722.315 into my '84 300SD, replacing the original tired 722.303, and would like to learn the factory specified torque value for the trans. fluid cooler line bolts to the case. Searches of threads here didn't produce any answer.

I prefer to carefully torque the bolts into this aluminum case and not use guesswork, even with care. If these threads in the case weaken from even a little too much tightening, the transmission's future usefulness becomes obvious.

Thanks for your time and for information.

[cho]

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Hi Rich,

does .315 fits 84 300sd directly or you had to do some adjustments?
(mine is also .303...)

sorry for the alu bolts,only what I can find is:

lbs/nm

Drive Plate Bolt ................................. 31 (42)
Front Crossmember Bolt (1) ....................... 33 (45)
Drive Shaft Clamping Nut ................... 22-30 (30-40)
Transmission Mounting Bolt (2)
10-mm .......................................... 41 (55)
12-mm .......................................... 48 (65)
Transmission Oil Pan Drain Plug .................. 10 (14)
Torque Converter Drain Bolt ...................... 12 (16)

cheers,

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[Richard Howard]

I learned from a reputable transmission builder in the U.S. state of Oklahoma that specializes in Mercedes transmissions that the 722.315 is an easy replacement for the 722.303. No changes are needed for the installation in the 300SD.

The 722.315 is the unit that includes the upgrades that Mercedes learned as needed over the years of use of the 722.303. The case is the same, but changes in springs and maybe valves in the valve body, and probably some changes in clutch packs along with possibly fixing whatever caused reverse to fail unexpectedly were included. I'm only certain about the valve body upgrades, the other areas I just suspect were dealt with.

Thanks for the torque specs - I have those already, just haven't found anything for the cooler line bolts.

[cho]

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Tx,Rich.

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[Stretch]

I've not found that specified in the original German FSM either. I think it was missed out - the Germans are not always as efficient as you might think!

[cho]

Originally Posted by Richard Howard

.... 722.315 is an easy replacement for the 722.303. No changes are needed for the installation in the 300SD.

Rich,


I assume that he had swapped tail housing to make e.speedo work?


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[Richard Howard]

Yes, correct. I had thought that since the .315 version came after the .303 (that included a pulse pickup for the electric speedometer, at least in my '84 300SD), that the .315 would include a pulse pickup housing as standard at the rear end. That was one thing I made sure to ask the rebuilder about.