Digger87xj
NAXJA Forum User
- Location
- Buffalo Creek/Lakewood CO
This is for the "wingless" type RMS found in later model 4.0l
In the last few weeks I have been getting a new design RMS from FelPro that has small "thumbs" of rubber molded at the split that created problems seating correctly. Before today, I had simply returned the part thinking it was boxed wrong and went with OEM.
After the fourth try to get the right seal, I decided to call FelPro's tech line. I found out that # BS-40183 has a new design, and install procedure.
What I was told by their service rep was to install the seal offset from the cap mating surface as such:
You can see the extra "thumb" of rubber there at the split....
apply a thin film of sealant to the cap mating surface as such: (green stuff on the bearing is assembly grease; I use ultra gray silicone on the mating surface)
Bolt it up and go.
What was explained to me was this was to offset the split of the seal from the split of the rear cap so as to provide a better seal. The extra "thumb" of rubber at the ends of the seal halves provides clamping force to force the seal ends together to prevent seepage. This also prevents the seal ends from protruding in between the block and cap mating surface (this I see a lot) as it's being torqued resulting in a minute gap.
Guess we will see the results...
In the last few weeks I have been getting a new design RMS from FelPro that has small "thumbs" of rubber molded at the split that created problems seating correctly. Before today, I had simply returned the part thinking it was boxed wrong and went with OEM.
After the fourth try to get the right seal, I decided to call FelPro's tech line. I found out that # BS-40183 has a new design, and install procedure.
What I was told by their service rep was to install the seal offset from the cap mating surface as such:
You can see the extra "thumb" of rubber there at the split....
apply a thin film of sealant to the cap mating surface as such: (green stuff on the bearing is assembly grease; I use ultra gray silicone on the mating surface)
Bolt it up and go.
What was explained to me was this was to offset the split of the seal from the split of the rear cap so as to provide a better seal. The extra "thumb" of rubber at the ends of the seal halves provides clamping force to force the seal ends together to prevent seepage. This also prevents the seal ends from protruding in between the block and cap mating surface (this I see a lot) as it's being torqued resulting in a minute gap.
Guess we will see the results...
