Hi I have 01 freightliner DD series 60 recently was in the shop twice last week got the ECM replaced had bad wiring and not enough ground... I had noticed before the truck shut down months before that the oil pressure started jumping around and not reading correctly. Ijust thought it was a sensor or electrical issue and on idle would be below 20 psi and runing near 30 psi..... After the shop read the same but now when I'm hauling near gross on incline after a few min of being on a low gear pressure start to drop and eventually I get oil signal with engine shutdown.... Truck runs fine afterwards .... Changed the oil pressure sensor thinking that was the problem but same thing happen with new sensor and it wasn't cheap. Oil is above full and I have a small coolant leak on head gasket ...... But coolant is @ full .... Not sure where to look? Can't afford any more shop fees I'm a Owner Operator. I'm not losing oil... I thinking it might be air but don't know where to look ....plz Help!........thanks
Help! Oil pressure problems
Discussion in 'Freightliner Forum' started by Tony01FRTLNR, Mar 9, 2012.
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The first thing to address would be the overfull oil level. Was the engine overfilled with oil? Or is another fluid entering the crankcase causing the oil level to be high? When the oil level is over full the rotating assembly will be slapping in the oil causing aeration of the oil especially at high rpms and on grades. Try draining the oil to proper level and don't run it overfull. Check the oil for fuel or coolant content when draining down to proper level.
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That was recently I put 1 gallon the first couple days after the it came out of the shop cuz I had fixed a leaking oil hose weeks before it had gone into the shop thiking it was low on oil .... Freightliner said no fluids in the oil its a bit over the full line Like 1/8 over or less .... But can drain some no problem
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Do you have the correct oil dipstick in the tube? I've seen a similar problem from a dealer that switched the dipstick. The new dipstick showed the oil level to be correct but it was way too high.
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As for the oil cooler being bad, check your coolant for signs of oil contamination. The oil pressure is higher than the coolant pressure when the engine is running, so you should see oil floating on your coolant if it's bad. I've also seen coolant turn to 'chocolate milk' as a result of a bad oil cooler. -
thanks windsmith can i see the o rings with the pan off ?
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hey windsmith ,
I put the coolant in and goes into system pretty fast if that makes a diff when I noticed the resevior was empty I filled it with two gals and 30 mi the resevior was empty again,
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