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  1. #1
    Bobtail Member
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    ISX Low Oil Pressure

    I have been scratching my head working on an ISX. About every 2500miles the oil pressure goes down to about 20psi. Replace the oil filter and pressure pops back up. I have seen this before, but it's usually caused by extended oil drain interval, or something mechanically wrong. I have had the oil pan off, replaced the oil pump, new o ring on pick up tube, new oil, new filter, new oil filter bypass plunger and spring. new air filters. checked base and static injection timing. checked charge air system, turbo looks good. DPF, DOC have been cleaned. I have cut the oil filters open, no debris just distorted(collapsed). No contamination in oil (fuel or coolant) sent away oil sample results good??????? Help

  2. #2
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    Quote Originally Posted by Mr. Truck Fixer View Post
    I have been scratching my head working on an ISX. About every 2500miles the oil pressure goes down to about 20psi. Replace the oil filter and pressure pops back up. I have seen this before, but it's usually caused by extended oil drain interval, or something mechanically wrong. I have had the oil pan off, replaced the oil pump, new o ring on pick up tube, new oil, new filter, new oil filter bypass plunger and spring. new air filters. checked base and static injection timing. checked charge air system, turbo looks good. DPF, DOC have been cleaned. I have cut the oil filters open, no debris just distorted(collapsed). No contamination in oil (fuel or coolant) sent away oil sample results good??????? Help
    Not to scare you but you need to find the problem ASAP, when i was a driver i had the same problem with a 475 ISX , engine went to Cummins several times and as well they changed oil pump and did several other tests . The engine run ok for 5000 miles or so then i needed to change the oil filter because low oil pressure and check engine light (LOW OIL PRESS).
    50000 miles after the engine blew up in Pensylvania , big hole in the block , went from 60mph to 0 in few seconds ,scary stuff, smoke and oil all over the windshield.

  3. #3
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    yea , oil was changed in that volvo each 15.000 miles at speedco ,betwen oil changes i usually changed 3 times the oil filter .

  4. #4
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    don't know the problem,but my friend had the same problem with two of his trucks same engines,the mechanics said no problems......,but in the next few thousand miles the two engines blew like crazy.FIND THE PROBLEM IMMEDIATELY!!!!!!!!!!

  5. #5
    Road Train Member Cowpie1's Avatar
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    Using Fleetguard filters? If so, there have been issues in the past with them. Supposed to have been cured by Fleetguard with newly designed filters, but these problems seem to still crop up once in a while. I have never had a problem, but then, I have used Donaldson filters since I bought the truck.

  6. #6
    Light Load Member mrdevildog's Avatar
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    if you replace the oil filter and the pressure comes back up then either the oil filters are the problem or something in the oil like high soot levels.

  7. #7
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    Quote Originally Posted by mrdevildog View Post
    if you replace the oil filter and the pressure comes back up then either the oil filters are the problem or something in the oil like high soot levels.
    Thats is right - it is BOTH actually. On engines with DPF (2007 and up) soot in the oil gets so high (these motors recirculate WAY more exhaust gasses than pre-DPF) it overcomes the oil filter media and eventually blows the engines. I think Cummins changed filter or filter recommendation . It was news about year ago, call Cummins they admitted wrongdoing on this f-up

  8. #8
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    i don't know if that helps with your problem but i also have isx475 and lucky me with out it riight now, but......company i drove before with around 200 isx's in their fleet they change bearing on the main engine shaft!!!! they do this when low oil pressure is seen or engine is between 800.000 - 900.000 miles .also heard that from many other mechanics and isx owners in chicagoland ,i'm not mechanic but trying to help, cost of this is with new bearing set, oil and filters around 1200-1500$$$ depense if you need oil pan gasket ,front and back seals...... also take head cover off and check if camshaft have some loose .....these are most important ISX ponits !!!! that's my advice, GOOD LUCK

  9. #9
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    depending on what year engine you have, there may also be a crankcase ventilation filter, has it been changed too?

  10. #10
    Bobtail Member
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    Low oil pressure

    Oh wow , just use a higher quality oil filter, such as K & N . Or split oil lines in parallel to lower oil pressure going to the filters.

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