In order to remove the starter pinion drive the starting engine has to be raised up out of the way as the drive gear on the pony keeps it from coming out.The governors are different on the 5J than the 4U & 5U D2s so you may or may have to remove the cover on the governor. I don,t have a parts book to look it up but try first without disturbing the gov. then if it needs to come apart then do it. Been too many years since I worked on one so not sure about the gov.cover needing to be removed.

OK, SJ, that makes sense. I just couldn't remember the procedure.

Jack

You need to remove the Governor before removing the starter pinion and clutch assembly from the flywheel housing. This gives you plenty of room to pull it out. Believe me, I know from doing it numerous times.

Charley-
There is a very good thread on how the starting engine recieves coolant. Hit the old site and you should be able to find it. It discusses the thermal syphon very well.

bernie

Bernie the D6 starting engines has a small belt driven water pump on them to circulate the coolant & is about the only engines with one that I recall.The only ones I dealt with were the D4600 & the D318 engines used in the the D6s & the industrial version of them.

SJ-
I did not know that. The thread I was refering to was for the D4 initially but the D2 came into the discussion too I think. I just tried to access the thread on the old board and could not get it to hit on anything. I may be mistaken and it might have appeared on the ACME board. I will check that too and try and provide Charley a link.

It spoke of the thermal syphon that Jack mentioned. The explanation given made a lot of sense. I just was not sure that it was conclusive that it was correct.

What horsepower would the D4600 or the D318 starting engine crank over to the main? Were they two cylinder also? Why did the D4600 and D318 utilize a water pump? Did the horsepower cause them to overheat faster or did they need to idle without the main turning for an extended period???

www.antiquecaterpillar.net/ACF_v2/showth...ghlight=pony+cooling




bernie

Great help, Thanks! Other farm chores ( fencing) and my day job have kept me from diving in too deep yet, but hopefully I can explore more of it this week. Although there is wood to cut and my wife wants....
Charley

Bernie the D4600 & D318 starting engines were basically the same style as the D2 & D4 but was bigger with the mag. put on a little different. The D4s are a 2.750" bore & the D6s are 3.125"so why the water pump on the D318 I have no idea unless it being bigger & builds up more heat than the smaller one but I really don,t have the answer why.

Thanks SJ-
bernie

Bernie,
The smaller pony is 10hp and the larger D6 is 15. Not sure about the waterpump. I've never looked at any of the vertical cylinder ponies for the D7/D8 or I believe the D9 had a horizontally opposed twin, but bigger than the D6 again.....don't know if any of them had waterpumps. Maybe being vertical designs the thermosiphon or convection cooling worked better than in the wide flat horizontal ponies.