Orchard D4 with 6G engine

This past weekend while a few of us was working on the Chapter 3 D4 orchard model we discovered that it had some modifications. The engine Serial number is 6G424. This number does not exist in the tracked machines serial number book. After removing the unreadable damaged rear transmission tag we found the serial number of 4G3835 stamped into the housing which makes it an 1937 year RD4. This is the transition year to D4 but this serial number is very early in the year so it is probably an RD4. Apparently the engine had been changed at some point. Cat showed that serial number 6G to be a 6 ring engine instead of 5 rings. Any idea what this engine came out of. Power unit perhaps.

The pony is running, the one new sleeve is installed, steering clutch is freed up. We hope to hear it run at our next work day on July 9th. We just need the one set of piston rings to get delivered to finish the assembly. Sorry but I took no pictures.

What you have is a R4 engine block(G 4400) set-up with D4400 accessories.

I have a parts manual r4 serie 6g931 to 6g5383 forme 8886 and the piston have 4 rings on top side and 1 in bottom side and it is 4 cylinder gas machine and the connecting rods are the same for 4400 and 4600

The D4/RD4 and R4 share the same block and bottom end.

Thanks guys. That clears up that mystery. I did not know that the gas and diesel shared the same block. We learn something new every day.

See old-iron-habit, you can teach an old dog something new!

Rodten

[quote="Rodten"]See old-iron-habit, you can teach an old dog something new!

Rodten[/quote]

Actual taught a whole pack of us grey growlers a new trick.

I have a 6G cat can someone tell me which cylinder is number one in front or back rebuilt mag trying to get it time

Can someone tell me which carburetor it had a strongberg 2d on it but was rusted beyond repair not sure if that the original carburetor

Most motors number 1 is at the front. Exceptions are later model tractors like the Fendt 300 series with the MWM motor.

The standard carb Was a Zenith K5A, there were also several other Zenith carbs used for other fuels, post the serial number, you may get more information.