Hey Bern!

Dieseltech · Jan 26, 2020

Have a 6000 piston question, do you recall where your Commander diesel pistons were in relation to the deck at TDC? Thanks!

Bern · Jan 26, 2020

You know, I didn't write it down, and there is no spec that I'm aware of, but I did look at it, and as I recall they were all pretty darn close to zero at TDC.

Dieseltech · Jan 26, 2020

Thanks! I checked the Commander engine before I took it apart, pistons ranged from flush to .005 above deck on the standard pistons. I'm using the .040 pistons from another block that I had bored and decked .005, pistons checked in that block now range from .012 to .015 above. The three used head gaskets all checked at .036 when removed so I know the pistons should be cut some. Also had all twelve valve seats installed in the head and had all valves set to .015 to .020 above the head as I'm going after more compression heat for better cold starting/clean exhaust. The closest piston/head clearance I've seen on some air cooled diesels run .020-.025, but I'd feel better with .030 clearance. Pistons have .070 valve pockets and with the head gasket added clearance will be good there. The intakes were sunk .070-.080 below head before, it should start much better now.

Bern · Jan 26, 2020

I would say that .015" above would invite some piston-to-valve kissing going on inside if your valves were any closer to the head surface. I had all of my valves reground and some seats were replaced, and as I recall they all came in at around .005 to .010" recessed when I got it back, which is about the spec for the 172" diesel, which is the spec we used. 6000 specs are almost non-existent, so we figured the 172" engine specs should be fine, since it's pretty much the 4-cylinder version of the 6000 engine.

Dieseltech · Jan 27, 2020

I'm putting this 6000 engine and 6000 SOS on an early 4000 row crop rear end, to be used for antique tractor drives. Probably won't ever used tenth gear again as it will be scary fast. Gears 5 through 8 will be the most used, even 9th is faster than most tractors, 1500 engine speed pencils out to about 30 MPH. The injection pump will be changed to engine oil lube, 8MM retard start notch plungers, and automatic excess/retard start cylinder taken from a Simms AC combine pump. Also using the flyweight set from the AC pump to replace the skate wheel weight set.

WayneIA · Jan 27, 2020

When you get this 6000 running with the 100 series rear assembly, could you physically verify 30ph at 1500 rpm? I am wandering if you can even get 30mph in 10th gear at the governed 2400 rpm! I am not aware of any gear ratio changes in the transmissions, of course I could be wrong, as I have been wrong "only once before" since getting married 62 years ago.

Dieseltech · Jan 27, 2020

The early 4000 SOS has a 3.66 planetary gear reduction same as the 6,7,8, and 900 series SOS did. The 6000 SOS does not use that gear set as it used axle planetary gears for speed reduction. So, using a 6000 SOS automatically increases ALL speeds on the early 4000 rear end by 3.66 times the 4000 speeds. While the two transmissions both bolt up to the diff case the same, some special coupler/disconnect work is needed as the 6000 output is larger. Gears 5,6,7,and 8 will work well for what I want to do. This tractor will mainly be used for antique tractor drives, and I like to shift up, and throttle back to help keep engine noise down, and I suffer from a disease I call tinkeritus...

David G · Jan 27, 2020

Sounds like it will do 60

WayneIA · Jan 27, 2020

I did not remember that. I guess the only thing I really remember of the S-O-S in a 6000 was the fact that it was a long way into the transmission compared to a 901

Hey Bern!

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