Unusual Detroit 6046 6-71

[anthony urek]

Hi all, I am new here and hoping someone can shed some light on a Detroit Diesel 6-71 engine I have in my shed.
It is unusual in a couple of ways.
Firstly it has a brass tag near the rear stating 6046(see pic attached) which is GM's code for tank. However Grant tanks (M4A2) which ran the 6-71 twins did not have a tag here. They had a slightly different tag on the transfer case which also states the reduction ratio of the gearing in the transfer case.
Also the Grants and Shermans which ran the twin diesels have 2 motors that spin clockwise when looking at the flywheel from the rear of the motor. My motor spins anticlockwise from the rear and should do so according to the model number (671RA54) on another GM tag on the motor.
So am I right in guessing that this motor could be from a late Valentine? Which would explain the rotation and the need for a different tag on the motor as there is no transfer case to put one on.
The motor has the same exhaust manifold, front cover, water manifold and 3 air filters as found on the Grant tank but a different model number and rotation.
Hope this makes sense.

[rob love]

I was always under the belief that the twin detroits in the Shermans were counter rotating.

[tankbarrell]

Originally Posted by rob love

I was always under the belief that the twin detroits in the Shermans were counter rotating.

You're not alone, some refuse to believe they don't even when you show how they couple together!

[anthony urek]

Nope....both spin left in Grants.
Can anyone verify this once and for all.

[roy206]

the gm 6046 fitted in sherman and also m10 tank destroyer turns seen from front counterclockwise and the outcoming propshaft from the gearbox turns clockwise. your twinset is a runner right now?
see our complet restored twinset running

http://www.youtube.com/watch?v=adEy5j4XiJk

[Perry Kitson]

twin diesel set up was clockwise from flywheel end(manual states rotational directions should be veiwed from fan end, hence counterclockwise rotation in manual), camshafts were counter rotating, left hand engine counterclockwise from flywheel end, right hand engine clockwise from flywheel end.
Hope this is not too confusing.

Perry