W111.012 220sb M180 engine- oil pump tightening torque - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 11-23-2011, 01:42 AM Thread Starter
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W111.012 220sb M180 engine- oil pump tightening torque

Hello, I try to find tightening torque for oil pump housing halves (4 bolts-2 long,2 short, all with self-locking nuts). I have got lots of oryginal DB workshop manuals but can not to find this amount...

Pictures of dismantled oil pump are here:

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post #2 of 4 (permalink) Old 11-25-2011, 08:45 AM
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You're going to need a gasket too. I looked at the technical manual for the W111 and there isn't a spec for the torque. As an estimate, the size of the bolt gives a clue, such as 25 - 30 ft-lbs. Bwotosh, on this forum, is a retired machinist and he would know.

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post #3 of 4 (permalink) Old 11-25-2011, 09:27 AM
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Those four bolts are delicate but hi strength. Tighten by feel rather than torque. use 1/4" drive sockets go around and around until you cannot get any more rotation.

Make sure the mating surfaces have been flattened with 150 grit wet-or-dry with WD-40 on a piece of plate (flat) glass, sand until surfaces show no distortion marks (about the bolt holes) wash grit thoroughly out..

You can also do the gear vanes with same paper until all scratches are gone.

I've never had to buy a new oil pump for these cars.
Rebuild it right.

(Warren I have the pump bracket attach bolts)

Brian O
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post #4 of 4 (permalink) Old 11-28-2011, 01:40 AM Thread Starter
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Thank You All for these informations! Oil pump is reassembled and checked for leackage and pressure delivery. Everything is OK! One more time-thank You very much for answers!
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