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  1. #1
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    cummins isx '06 oil leak and weak jake brake

    hi, i own cummins 475 isx ;06 ,that's volvo got 1005000 miles ,runs still strong keepin fuel milage around 6,2 -7,2 dependable of condition and loads but a have 2 major problems running in my head : 1 oil leak on back of engine (driver side , head level) and front (between block and wheels cover) , not much loose on dipstick ,oil preassure is around 36psi high rpm so....whats the deal -->do it head gasket or no at that milage???? is it worth or wait with it to overhaul???????????? 2:whistling noise when on jake brake going downhill ,then pedal to the metal and after 2-4 seconds is gone?????????????? this noise is coming from the right side of engine and can't see there anything wrong or loose or missing???????
    love this truck and engine so any guessing and/or solutions will be aprriciate


  2. #2
    Road Train Member Heavyd's Avatar
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    Personally, I think it is a complete waste of money to spend hundreds or thousands of dollars to fix cosmetic oil leaks. All engines leak oil, they just do. If your not loosing much off the stick I would just power wash it and run it until it is time for overhaul or trade in. Drip, drip, drip type of leaks need to be fixed. Something that takes a few days or a week to form is nothing I would be concerned with.

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  4. #3
    Road Train Member
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    I had a gasket go bad that sits between the turbo and the block. It made the worst noise at higher altitudes, thought the turbo was going to blow!

  5. #4
    Light Load Member mrdevildog's Avatar
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    wouldnt worry about the leak since the head gasket will get replaced at overhaul time, the noise sounds like a exhaust leak, i would check around the turbo area and the exhaust for leaks.

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  7. #5
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    thank you very very much, i love to keep my engine clean, fix any single or even little problem right away also in restt of the truck that's why i can't get it out of my head if we talking about overhaul how you guys know when is the time to do this??????? what is better overhaul or buy other low millage engine from salvage truck???? what is the cost and warranty of overhaul (and risk) and salvage engine???? i giving all these questions cuz with over 1 mil miles this time is slowly coming.........and again lot of thanks for all of you

  8. #6
    Road Train Member Heavyd's Avatar
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    I would never get a salvage engine, period. Engines last a lot longer than they used to. There really is no set interval for an overhaul. As long as your engine has good power, doesn't burn too much oil and is still decent on fuel I would keep going. I would recommend getting oil samples done and when metal counts in the oil same start to get high, then you can think about overhauling.

  9. #7
    Road Train Member VisionLogistics's Avatar
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    You're looking at $6800 for a gasket overhaul on that motor, providing the head and everything else is in good shape. Sunk liner? Cracked Head? Might as well just rebuild it at that point since 75% of the cost is in labor due to that stupid ISX design. Rebuild or replace.

    I'm in the same boat: I have an 04 ISX 475 with 950k ecm miles. It has had work done to it I think because it dyno's at 98%, and with less than normal blowby. The oil analysis report even suggested that I could run extended oil changes because it was so clean. BUT! It's leaking on the head gasket especially in the back drivers side corner. About a gallon every 20k miles. Burns no oil, but leaks like a harley. Cummins denies any problem, while all of the shops I've talked to say it's a known problem. Since there isn't coolant in the oil, I will just run it and add oil. Probably take it in for an overhead at which time they should check the head torque for me and inspect the rack.

    Either way, once you get into it just for labor on the gasket overhaul, you're 3/4th of the way there for a rebuild.

  10. #8
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    wooow! .........my jaw dropped down....that is exaclley same boat, has power, no blow by, no smoke oil ,good mpg and this #^%$^^$& oil leak!!!!! but almost 7 grand just for gasket that's around half of overhaul i guess, i change oil every 12.000 miles ,since i won't put gallon or more between changes i leave it do you know where is dyno in chicago area i can go and check my engine????????
    thanks a lot, be save

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