So I've lost all oil pressure on this truck, a 2021 Freightliner with a DD15, the clock is showing ~429,300 miles and 20,059 hours. I've got oil all over the inner side of the driver's side steer tire, on the frame, the shock, spring, drag link, cross shaft, and all over the engine from the fuel filter housing back, and up to the injectors down to the pan, with injectors 2 through 6 weeping oil out of the ports for the feed tubes. What could have let go? Rear main? Rear structure gasket? Front main? Air compressor and/or fuel pump seals? All of the above? I'll see if I can figure out how to post pictures in the replies to this post
2021 Detroit DD15 loss of oil pressure
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Gaius Romulus Rex, Jan 26, 2025.
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Any work done recently?
I’d look at the oil filter housing and where it mounts.
@QUALITYTRUCK -
No oil pressure because of the failure or no oil pressure because it no longer has oil in it?
If its got oil in the pan and no pressure the first place I'd be looking at would be the filter housings and any external oil lines.little cat 500 and DUNE-T Thank this. -
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Last edited: Jan 27, 2025
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If there is C.E.L. on dash, check if oil psi sensor/wiring is in working order with code reader. Then drop oil pan and check suction manifold and tube orings. Oil pump would be last check before it gets real serious.....
062 Thanks this. -
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Gaius Romulus Rex Thanks this.
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