4.0L HO Jeep Engine Build
OK, here's a few tips. First of all, 2001 through 2002 blocks use a different rear main seal than all other 4.0's. Oddly, my block is a 2000 and uses the newer style seal. Why did they change seals and why does my somewhat earlier block use it? I have no clue. It's a Jeep thing and no one understands, lol.
Pictured below are the two seals. The earlier one is the top one with the arms on it and the later one looks more like a standard LA or Magnum seal. The part number for the early one is BS40612 and the late one is BS40183.
When installing these types of seals I always leave an 1/8" sticking up on one end on the cap and drop the coordinating end in the block so the parting lines don't match the block. Less chance of a weep that way. I always use the little plastic tab they give you when installing too. That prevents damaging the backside of the seal. Oh yeah, the lip of the seal always faces the the inside of the engine. :)
OK, here's a few tips. First of all, 2001 through 2002 blocks use a different rear main seal than all other 4.0's. Oddly, my block is a 2000 and uses the newer style seal. Why did they change seals and why does my somewhat earlier block use it? I have no clue. It's a Jeep thing and no one understands, lol.
Pictured below are the two seals. The earlier one is the top one with the arms on it and the later one looks more like a standard LA or Magnum seal. The part number for the early one is BS40612 and the late one is BS40183.
When installing these types of seals I always leave an 1/8" sticking up on one end on the cap and drop the coordinating end in the block so the parting lines don't match the block. Less chance of a weep that way. I always use the little plastic tab they give you when installing too. That prevents damaging the backside of the seal. Oh yeah, the lip of the seal always faces the the inside of the engine. :)
