Recently rebuilt the motor for a ford 640 kit came with rope and neoprene rear main seals. When we disassembled it the motor used both so we put both back in from front to back you have Bearing, Rope seal then neoprene seal. However, it leaks really bad out the rear main into the transmission and down the rear plate. Reading on the forms I tried everything ordering the rubber side seals with the pins twice bigger rear main seal and silver silicon from victor rienz. then I read a post that the rope seal is not needed. I just want verification before I drop the pan for the 5th time. Oil is expensive and I don't want to do it again please all help is appreciated.
- Thread starter thunsaker
- Start date
showcrop
Well-known Member
Two grooves but only ONE seal. The seal, whichever you use, goes in the rear groove. Before going any further, if you haven't yet, and you plan to use the rope seal, view the video on installing a rope seal in a Holden V8. It is extremely comprehensive. The Neoprene seal is usually the preferred one, and I think that the side seals with the pins are terrible, and the Victor Reinze silicone is very difficult to get all the way to the bottom.
I had the same question on my Ford 800 rebuild. After a lot of searching I found exactly what ShowCrop said. The seal goes in the rear groove. If you notice, there is a hole in the bottom of the groove closest to the main bearing. This allows oil to flow across the bearing and then back to sump. If there was a seal in this groove also, the oil flow across the bearing would be dead-headed causing localized overheating of the oil and loss of oil film.
I did find the two holes had to clean them out we will see in a couple of days when I put it all back together what happens. I will be doing a Ford 850 rebuild next then a Ferguson 30 after that. My dad got me addicted to these tractors he has an 8N that we rebuilt when I was much younger. That I just recently rebuilt but can't keep oil pressure or much flow for that matter.
Hobo,NC
Well-known Member
- Location
- Sanford, NC
Sometime back about the same question came up showcrop nailed it then and nailed it again : )
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