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Thread: oil pressure

  1. #21
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: oil pressure

    I have seen two, 2.5 engines, that had very low oil pressure due to excessive balance shaft clearance. Both were very low mile engines and had the short blocks replaced under warranty, only to start knocking again. The problem was diagnosed by pressurizing the oil system with the oil pan removed.

    Thanks
    Randy


    There is no logical reason to call an Engine a motor.

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  2. #22
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    Re: oil pressure

    yes definitely has a o-ring on the oil pump pick-up tube

  3. #23
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    Re: oil pressure

    What oil viscosity are you using?

  4. #24
    turbo addict
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    Re: oil pressure

    Quote Originally Posted by GLHS60 View Post
    I have seen two, 2.5 engines, that had very low oil pressure due to excessive balance shaft clearance. Both were very low mile engines and had the short blocks replaced under warranty, only to start knocking again. The problem was diagnosed by pressurizing the oil system with the oil pan removed.

    Thanks
    Randy
    Had a buddy go through 4 cranks because of this. He took the balance shafts out and the bearings were absolutely destroyed inside.
    Ian Adams Function>Form 1990 shadow scrapped, too rusty:( 1991 Spirit R/T Scrapped, parts sold:( 1989 Turbo Caravan Daily beater with built-[I]ish [/I]​engine slowly evolving into weekend turbo beater.

  5. #25
    Supporting Member II Turbo Mopar Contributor
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    Re: oil pressure

    IIRC, there's supposed to be sealant between the block and the oil pump.

    - - - Updated - - -

    IIRC, there's supposed to be sealant between the block and the oil pump.
    John Laing

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  6. #26
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    Re: oil pressure

    Quote Originally Posted by Chris W View Post
    If the BS are still in place then that's not the issue.

    Oil sending block screwed too far in?

    Chris-TU
    This ^^ was my issue when I had no oil pressure.

  7. #27
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: oil pressure

    EXACTLY!! A very often overlooked item.

    Thanks
    Randy


    Quote Originally Posted by shackwrrr View Post
    Had a buddy go through 4 cranks because of this. He took the balance shafts out and the bearings were absolutely destroyed inside.
    - - - Updated - - -

    EXACTLY!! A very often overlooked item.

    Thanks
    Randy


    Quote Originally Posted by shackwrrr View Post
    Had a buddy go through 4 cranks because of this. He took the balance shafts out and the bearings were absolutely destroyed inside.


    There is no logical reason to call an Engine a motor.

    Randy Hicks
    86 GLHS60
    86 GLHS 373 : SOLD, but never forgotten
    89 Turbo Minivan
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  8. #28
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: oil pressure

    Hey Roofer!!

    Did your engine suffer any damage or was it just no oil pressure on the gauge?? I've never had this issue and have heard about it, but the crank should get oil pressure even if the oil pressure block is bottomed out. The turbo would starve for oil but not the crank. The balance shafts are directly fed full oil pressure that is shared with the crank so a worn out balance shaft assembly would certainly reduce the supply of oil to the crankshaft.

    Thanks
    Randy
    (roofless)

    Quote Originally Posted by rooferchris View Post
    This ^^ was my issue when I had no oil pressure.
    - - - Updated - - -


    There is no logical reason to call an Engine a motor.

    Randy Hicks
    86 GLHS60
    86 GLHS 373 : SOLD, but never forgotten
    89 Turbo Minivan
    83 Turbo Rampage : SOLD
    Edmonton,Alberta,Canada

  9. #29
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    Re: oil pressure

    When I bought the car it had this problem so I thought it was worn out and had motorhead rebuild me a block. Reassembled the works reusing the old pressure block and had the exact same problem with the new motor! Called motorhead and after some trouble shooting he suggested I buy a new one on the notion the old one was faulty. Installed a new one with tape to the point of just snug. Never had a problem since. I know the gauge wasn't faulty, you could hear the motor knocking every time it would fall off. No real damage to the new motor tho, Bryce builds them strong.

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  10. #30
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    Re: oil pressure

    so what your saying is that the pressure block was bad ? how did you know it was bad ? & would mine just go bad all of a sudden? how do the balance shafts effect oil pressure? why would I have pressure at first when cold but once engine warms up I loose oil pressure and noise begins , I just don't know what I am missing here! I was good with this current setup for a year so what the heck!

  11. #31
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    Re: oil pressure

    I'd get rid of the balance shafts and go from there. Check that you have flange sealant on the pump. You will have to block the hole but you can do that with the block in the car.

  12. #32
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    Re: oil pressure

    Quote Originally Posted by turbo-tease View Post
    so what your saying is that the pressure block was bad ? how did you know it was bad ? & would mine just go bad all of a sudden? how do the balance shafts effect oil pressure? why would I have pressure at first when cold but once engine warms up I loose oil pressure and noise begins , I just don't know what I am missing here! I was good with this current setup for a year so what the heck!
    The pressure block itself was fine and so was the sender. The p.o had over tightened the sender when installing it on the pressure block. It was decent pressure until hot then would fall on it's face and start knocking. My issue was with a '86 turboI 2.2.
    Mine didn't just happen randomly though, that's the only difference. Try loosening your sender from the block a full turn or so, see if that does anything. Worth a try.

  13. #33
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    Re: oil pressure

    How are you verifying oil pressure? What did the bearings look like you replaced? I've seen it too, worn out BS assembly's will cause low oil pressure.
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  14. #34
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    Re: oil pressure

    the rod bearings were messed up! what are peoples feelings on removing the balance shafts completely?

    - - - Updated - - -

    Quote Originally Posted by bgbmxer View Post
    I'd get rid of the balance shafts and go from there. Check that you have flange sealant on the pump. You will have to block the hole but you can do that with the block in the car.
    flange sealant on the pump?

  15. #35
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    Re: oil pressure

    Quote Originally Posted by turbo-tease View Post
    the rod bearings were messed up! what are peoples feelings on removing the balance shafts completely?

    - - - Updated - - -



    flange sealant on the pump?
    When you bolt the oil pump to the block you have to use flange sealant. Loctite makes it. Balance shafts, get rid of them. An plug the oil feed hole for them. I also remove the sound deadening from every oil pan also

  16. #36
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanman²'s Avatar
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    Re: oil pressure

    I personally don't like the 2.5 with the BS's removed, too much vibration/noise.

    You can use anerobic sealer to seal the oil pump to the block.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

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  17. #37
    Supporting Member Turbo Mopar Contributor supercrackerbox's Avatar
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    Re: oil pressure

    I also used anaerobic sealer on my oil pumps without issue. In fact, I think that's what the FSM said to use?

  18. #38
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    Re: oil pressure

    where would I buy this?

    - - - Updated - - -

    why is there so much conflict with the balance shafts?

  19. #39
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    Re: oil pressure

    does there need to be sealant? I have never used sealant for this before.

  20. #40
    Supporting Member Turbo Mopar Contributor supercrackerbox's Avatar
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    Re: oil pressure

    Quote Originally Posted by turbo-tease View Post
    does there need to be sealant? I have never used sealant for this before.
    Where the pump bolts to the block? You don't want any oil pressure leaking out there and not making it into the engine's oiling system.

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