I will have them check and service the entire engine, adj valves, fuel mix ect. I made an appt with Colton Truck Terminal. I left the motorhome at my home in Havasu. We both had 94 5.9's on a Vectra (Spartan chassis).Good Luck.RKL Cost was around $900 as they had to drop the Allison to get at the seal.Oil came out the same place. We both had the seal replaced with new improved seals (part of them is leather I am told). Same thing happened to mine at 65,000 and to my buddy's at 72,000. What did you find out on your leak issue?ĩ4 Bounder 36'P Diesel Pusher, Cummins 5.9, Osh Kosh Chassis 89'vette, 98'suburban, 04'aveo so if I were you check the back of the engine for leaks.other the rear main bearing seal. The new cummins engines are now design to run a million miles.

Years ago it was common for rear main bearing seals to leak Ford was a great one for rear main bearing seal leaking. You didn't say how many miles you got on the engine ! If you got least than 200,000 miles on it I doubt if your problem is rear main bearing seal. Then I am going boating and I am going to leave it at the Havasu house and drive the toad back to Big Bear. I am going to open a beer and try to put it out of my mind. Cummins engines have some great warranties so check it out. Check your warranty and then get the oil leak fixed before something else takes place. You never said anything about the mileage on your Cummins. Any thoughts? What type is seal is used between the engine and Allison Trans, rope, one piece, rubber?ġ995 63,000 miles not under warranty, engine oil came out of bottom hole on what I would call tne bell housing on the Allison, I can put my finger in the hole and it gets oil soaked.Ģ004 Alfa See Ya Gold 40' 400 ISL, Hummer H3 Toad,Ram 1500 4X4 Quad Cab Toad, 24' Hallmark Cargo Trailer, 20' Carson Toy Hauler when we need the extra room. I am hoping my oil is dirty and needs to be changed. I went from high elevation cold to 100 plus in Havasu. I lost 2 quarts of oil out the rear main on my Cummins 5.9 B on a 300-mile drive. RV.Net Open Roads Forum: Rear main leak on Cummins 5.9 B Open Roads Forum

07 5.9 cummins rear main seal