I have two flywheels, both came off 9N's but they are different in that one weighs about 50 pounds, the other about 30 pounds. The 50lb unit came off a 39 that I had as a parts tractor, it had an 8N short block with 9N parts. The 30lb unit was mounted in my s/n 9N292 engine which had been sort of rebuilt. It has a new ring gear and is tapered around the outer diameter about two inches which causes it to be lighter in weight. Wondering if and when the lighter unit was used on 9 or 8N tractors or perhaps was a V8 unit and got a tractor ring gear installed. The new ring gear makes it attractive to use in my rebuild of the s/n 292 engine, but would like to know more.

HiYa Steve-
Chances are your flywheel has been serviced before and you simply have whatever aftermarket supplier was there at the time. FORD always had at least two suppliers to supply parts. I can't explain why a 20# diff between the two but suspect one is wrong. Measure the O/A thickness of the flywheel with your calipers or a mic and compare. I machined thousands of FORD 6375 Flywheels in my years as an NC Turning Specialist. I have the original blueprints for them and the ring-gears. EI data has weight of finished parts as well as material specs and more.

Tim Daley (MI)

Hi Tim,
I was planning to do what you suggest, the 20# difference was the big thing, also the lighter one is just slightly out of balance, need to clean them both up completely and measure them as you note. The heavier one is a real 9N unit, I believe. The lighter one might be easier on the rear main bearing while the rebuilt engine sits waiting until I finish with transmission and differential. Probably not an issue though.

I have some photos to send you of things I've found peculiar to this early 292 9N that changed in slightly later production units, Talk to you soon.

Around the first 500 or so 9Ns had a different block casting. The rear gasket flange was in the bellhousing area,that reduced the clearance for the flywheel. Therefore it was thinner (lighter). Thanks, Jason Grooms

Hi Jason, I just discovered the different block casting on my s/n 292 when I installed the oil pan last week and saw that it had a sealing surface that was exposed on the front edges of the bellhousing. The pan came off a 9N of s/n 3000 vintage and was notched in the front. The original 292 pan (or the one that was on it) was broken at the front so I discarded it not thinking there would be any difference. As you note there are flanges on the flywheel side of the bellhousing which I plan to check against the flywheels for clearance. I took both flywheels off their respective engines around the same time, but believe the lighter came off 292. Am finding lots of little things hat are different on this tractor than on others only a few thousand units newer. I have a governor that uses four screws to hold it together with a gasketed face that is clearly an early unit compared to the normal 9N model, no telling how long these were supplied.

Thanks for the info,
Steve

HiYa Jase-

Ah, explains it now. Thanks for sharing this valuable info. Parts Production Books only have the later 2N parts.

TPD