6NZ C15 340C jake issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Stubby379, Dec 17, 2020.

  1. Stubby379

    Stubby379 Bobtail Member

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    I have a 2000 6NZ
    Pdi stage 1 flash
    78mm borg Warner.
    with 880,000 miles, ran the overhead. .037 on the Jake's.. 015 and .030. Exhaust and Intake. Still makes a very distinct pinping noise while jaking on high. Sounds like metal on metal slapping together. It only does this once the motor reaches above 150 degrees oil temperature. When the engine is only warm the Jake works fine. Good boost. Once the noise starts, I loose 3-4lbss of manifold pressure. If I run medium and low jake setting no noise. I assume it's coming for the 3 set of valves, specifically the number 6 valves. When I did the overhead, I looked for anything that was loose or worn. Made sure to seat the valves with a dead blow before doing lash measurements. Purged the oil in the master pistons for the jakes.. I am clueless on rebuilding/ inspecting the jakes.. could someone give me any advice here?

    Also a side note I do notice that once the oil warms up I can also hear and feel a decent clicking noise when using full power.
     
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  3. spsauerland

    spsauerland Road Train Member

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    Did you check exhaust manifold and turbo gasket well for exhaust leak?
     
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  4. Superhauler

    Superhauler TEACHER OF MEN

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    keep stroking.
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    Ding, ding, winner ! ^^^^^^;
     
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  5. Shawn2130

    Shawn2130 Heavy Load Member

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    Is .037 a lot of gap for a Jake lash?

    I set my 6TS at .027.
     
  6. Superhauler

    Superhauler TEACHER OF MEN

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    Depends on what jake model and arrangment #.
     
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  7. Stubby379

    Stubby379 Bobtail Member

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  8. Stubby379

    Stubby379 Bobtail Member

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    Sorry for the late reply, but when i did the overhead we installed a new turbo, all new gaskets , inserts, and, studs/ hardware. But unless a small crack in the manifold is causing the noise id be really surprised. My guess is maybe something in the jake is work or not working properly. I was hoping to find someone with the rebuild steps/ documentation.
     
  9. spsauerland

    spsauerland Road Train Member

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  10. Stubby379

    Stubby379 Bobtail Member

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    Thank you I have printed it off. Very helpful i will return with an update after Christmas. Now if I just had the same documentation for cat motors..
     
  11. spsauerland

    spsauerland Road Train Member

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    What you after...
     
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