Question about 1996 Dodge Ram 1500 Club Cab

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96 dodge ram 1500 5.9l i replaced the plenum and now i have no oil pressure unless i rev engine. thought the oil pump weht out so replaced the pump same thing, i replaced the intake gacket and still no oil pressure. what is the torque for the intake bolts, could that the gasket on the intake not have sealed. please help.

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  • fweido Jul 14, 2010

    i have tsted the oil pressure manual gauge and still the same no pressure at idle but some at reving. i have replaced oil pump, intake manifold along with plenum gacket. aldo when reving up it smokes now, never did it prior to replacing gaskets.



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No the intake manifold or plenum has nothing to do with the oil pressure of the lubrication system.

It may pay just to check the oil pressure sender unit it maybe faulty.
Also remove the oil filter and check that there is nothing blocking the relief valve in the oil filter head if it has a relief some models did and some didn't.

remove the relief valve clean and then recheck pressures.

Your torque settings for the inlet manifold are 12

Oil pressure settings should be the following:
- At idle 6 psi
- At 3000rpm 30-80psi

Let me know if you need further information



Posted on Jul 14, 2010

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If you have no oil pressure, then revving the engine is not a good thing.
I suspect that the oil pressure sending unit needs to be replaced so you don't get a false no oil pressure light or reading on your gauge.

Good luck to you.

Posted on Jul 14, 2010

  • 2 more comments 
  • Duane Wong
    Duane Wong Jul 14, 2010

    I think that if you run an engine with no or low oil pressure then the engine will wear out or is already worn out.

    You see, if the passages are too wide in the engine, then the oil that is pumped through it will just dribble around the engine and not cause much backpressure which oil pressure is.

    I think you have a worn out engine, maybe, or the oil is leaking internally with too much ease.

    A little bit of flow of oil in a tight new engine creates back pressure and thus higher oil pressure on the gauge than what you are experiencing.

    Hope this helps.

  • Duane Wong
    Duane Wong Jul 14, 2010

    Oh, you mean the intake bolts for the oil pump area? I believe you may be on to something if the oil pump's gasket did not seal. Let me check for the intake bolt torques.

  • Duane Wong
    Duane Wong Jul 14, 2010

    3.9L, 5.2L and 5.9L Engines

    1. Disconnect the negative battery cable.
    2. Raise the vehicle and support safely. Drain the oil and remove the oil pan.
    3. Remove the screen.

      Fig. 3: Remove the screen, then unbolt the oil pump and remove it from the engine

    4. Unbolt the oil pump from the rear main bearing cap and remove it from the vehicle.
      To install:

    5. Prime the pump by pouring fresh oil into the pump intake and turning the driveshaft until oil comes out the pressure port. Repeat a few times until no air bubbles are present. Install the oil pump with a rotating motion to ensure proper pump driveshaft engagement.
    6. Hold the pump flush against the main cap and finger-tighten the attaching bolts. Tighten the bolts to 30 ft. lbs. (40 Nm). Install the screen, and oil pan with a new gasket.
    7. Connect the negative battery cable and check the oil pressure.

    8.0L Engine

    1. Remove the timing chain cover.
    2. Remove the relief valve plug, gasket, spring and the valve. Discard the gasket.
    3. Remove the oil pump cover.
    4. Remove the pump rotors.
      To install:

    5. Install the oil pump and lubricate the pump rotors with petroleum jelly or Lubriplate® .
    6. Install the timing chain cover.
    7. Position the oil pump cover onto the timing chain cover and tighten the cover bolts to 125 inch lbs. (14 Nm).

      Fig. 4: Lubricate the rotors as a means of priming the oil pump so it is not dry on start-up — V10 engine

    8. After the cover is installed, make sure that the inner ring can still move freely and does not bind in any way.
    9. Install the timing chain cover. Squirt oil into the relief valve hole until oil runs out.
    10. Using a new pressure relief valve gasket, install the relief valve plug, tightening it to 15 ft. lbs. (20 Nm).
    11. Fill the oil filter with oil and install it on the engine.

    Diesel Engine

    1. Disconnect the negative battery cable.
    2. Remove the drive belt, radiator and fan assembly.
    3. Remove the oil fill tube and adaptor.
    4. Remove the crankshaft pulley and front cover.
    5. Remove the four pump mounting bolts and the pump from the block.
      To install:

    6. Prime the pump by pouring fresh oil into the pump intake and turning the driveshaft until oil comes out the pressure port. Repeat a few times until no air bubbles are present.
    7. Align the idler gear pin with the locating bore in the block and install the pump.
    8. Tighten the mounting bolts in the proper sequence to 44 inch lbs. (5 Nm), then repeat the torquing sequence to 18 ft. lbs. (24 Nm).
      NOTE: When the pump is correctly installed, the flange on the pump should not touch the block; the back plate on the pump seats against the bottom of the bore.

    9. Measure the backlash of the idler to pump drive gears. The specification is 0.003-0.013 in. (0.08-0.33mm).
    10. Measure the backlash of the idler to crankshaft gears. The specification is 0.003-0.013 in. (0.08-0.33mm).
    11. The remainder of installation is the reverse of removal. Tighten each component to specifications.

  • Duane Wong
    Duane Wong Jul 14, 2010

    I think it says 30 ft. lbs. but I think your engine might be worn out by now with the low oil pressure and all that revving.

    Good luck to you on it.


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  • Contributor
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The intake will have nothing to do with the oil pressure.
intake manifold tork specs are as listed
start in the midle of the intake and go across from each bolt
first tork to 15 ft lbs then to 20 ft lbs.
go back and forth start in the center and go out.

Now for the oil pressure,,,,,,,,,,,,,
I would get a mechanical guage and put that on the motor to check the oil pressure, Sounds like there is a bad oil cending unit or guage on the dash.Im thinking the oil cending unit is bad,
If this checks out ok and the guage and iol cender is ok then we need to look at main and rod bearings.
This is a long step and great deatale is needed to do
I would sugest a motor service manual you can get at the parts store for this step.
Let me know if i can help more!

Posted on Jul 13, 2010

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