R975 Radial engines

[Dennis Cardy]

Yes, exactly. Ground Hover torques the drive line to the max. In another question about the engine...In flight, it's sort-of level.

[Bob Phillips]

Related to Robs earlier post (37) I talked with Stew Robertson who was Bill Greggs mechanic about the two radial engined vehicles in the collection. While it was 30 years ago he recollected that the engine in the Sexton required a complete OH and so he tore it down and rebuilt it. This was a machine from England not one fron South Eastern Equip in Georgia. It was a long process especially trying to source parts from Toronto surplus yard, Levy Auto Parts. The Grizzly was running very roughly when it arrived from England and two cylinders, pistons, rods were replaced. Oil pressure was erratic but when repair work was completed it ran fine. This suggests damage from hydrostatic lock perhaps when attempting to start, but this is only a guess after 30 years.

[rob love]

Bob
Interesting info on the two engines. I get so much conjecture and hearsay on these two pieces I don't know what to believe.

[Jordan Baker]

Found this while doing some late night CAM reading.

[Hanno Spoelstra]

Originally Posted by Jordan Baker

Found this while doing some late night CAM reading.

Excellent, Ram tank material!

If anyone is wondering what CAM magazine is, see this thread:
http://www.mapleleafup.net/forums/sh...ad.php?t=28361

H.

[Bob Phillips]

Great poster Jordan!
I should send all interested readers, to an excellent WW2 era report on the R975 recently posted on the Sherman Site. It is the most detailed history I have ever read and I only discovered it a few weeks ago. Many interesting bits of information including;
- many failures due to overheatine, hence C4 styled cylinders
- significant issues with excess fuel during shutdown , therefore degassr shutoff valves
- over reving of engines (engine as brake) spells quick death to engine
- as C1 and C4 share 85% same parts many C1s converted to C4s during major overhauls
and much more!
BP

[Bob Phillips]

In a previous post reference was made to the Bill Gregg collection now under the TLC of Rob L. There are some good photos of some of the major items including unrestored condition pics if you search up Bill Gregg photos at the Wellington County Museum and Archives.