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Thread: 99 Seville: No Oil Pressure after Cylinder Head repair

  1. #1
    LittleNo is offline Cadillac Owners Fanatic
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    99 Seville: No Oil Pressure after Cylinder Head repair

    I've done the cylinder head bolt thread job on my Miss's 99 Seville and just got everything completed. The Engine runs as it should but has no oil pressure, absolutely no oil at the filter and at the camshafts, and from the noise I guess the timing chain has no oil too.

    Anybody an idea? I've already put in 10 quarts extra oil with no change on the problem.


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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 Seville: No Oil Pressure after Cylinder Head repair

    Did you follow the GM service Manual exactly concerning locking the crankshaft and setting the harmonic balancer bolt torque ? That balancer hub and its torque setting is what drives the oil pump. Not done correctly and you WILL NOT have oil pressure - guaranteed.

    Good thing this is a roller cam follower engine - you probably haven't fried the cams - yet.

  4. #3
    Jim 99 eldo's Avatar
    Jim 99 eldo is offline Cadillac Owners Fanatic
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    Re: 99 Seville: No Oil Pressure after Cylinder Head repair

    That bolt needs to be as tight as you can get it and then 1/4 turn more. will be a real bit*h to get it tight now that it is in the car.

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    LittleNo is offline Cadillac Owners Fanatic
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    Re: 99 Seville: No Oil Pressure after Cylinder Head repair

    thank you guys, finally I made it

    this is not my first N* and yes, I put the 50 Nm and additional 150 on the bolt.

    For anyone who interests: The problem was the new front crankshaft seal I've put in. A piece of rubber was loose and when I installed the balancer it got between the balancer and the oil pump which forced too much pressure on it. A new seal, installed with a lot of silicone lube (to make sure it survives the install of the balancer) and everything runs fine now.

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Re: 99 Seville: No Oil Pressure after Cylinder Head repair

    You put 17.5 quarts of oil in the engine?!?!?!

  7. #6
    johnny kannapo's Avatar
    johnny kannapo is offline Cadillac Owners Connoisseur
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    Re: 99 Seville: No Oil Pressure after Cylinder Head repair

    That should be enough to immerse the pump/crank & all the lower galleys.

    Do few no-spark cranks & get some up to the pins & watch through the fill port for oil on the cam bucket flow before you drain the excess out.

  8. #7
    LittleNo is offline Cadillac Owners Fanatic
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    Re: 99 Seville: No Oil Pressure after Cylinder Head repair

    You put 17.5 quarts of oil in the engine?!?!?!
    yep, that can help when you have a stuck pressure release valve at the pump, of course it's only a try and must be drained before you go on with the engine running


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