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Thread: 345 oil pump issues.

  1. #1
    Join Date
    Oct 2009
    Location
    Australia
    Posts
    18

    Default 345 oil pump issues.

    i'm having some oil pressure issue's, like once the engine's heated up the oil pressure drops to very low on the guage. is it a difficult job to replace the oil pump in the 345? i'm not sure if the pump is the problem but if it's easy enough to get to i'll swap it over for another one.

    which brings me to another question, does anyone know a good place to buy an oil pump? i'm in Australia but i don't mind paying postage .

    thanks

  2. #2
    Join Date
    Jun 2009
    Location
    Hurlburt Field, FL
    Posts
    495

    Default

    What kind of driving are you doing most with your Scout? It's quite common for the oil pump to empty the entire oil pan if you do a lot of high rpm driving (like highway driving). Also, there's more than one thread on here that explains about how the IH v-8's always run low oil pressure once they warm up. It's nothing out of the ordinary.

    If you are still intent on replacing your oil pump or anything else on your scout, look up some of the light line dealers like Super Scout Specialists, IHonly, Scout Parts, or any of the others out there.

  3. #3
    Join Date
    Oct 2009
    Location
    Australia
    Posts
    18

    Default

    i've read that it's normal for the oil pressure to drop but my main concern is the amount of engine noise i've got. the rockers are rattling once the RPM picks up, plus it sounds like the cam gear is knocking a bit too. when i can i'll fit a mechanical oil pressure guage to get the actual pressure reading. any idea what it should be?

  4. #4
    Join Date
    Feb 2009
    Location
    Aiken, SC
    Posts
    2,423

    Default

    Low oil pressure in an SV series engine is supposed to be 10-20 psi hot idle 30wt oil. If you are getting lifter rattle your cam bearings have probably failed. You can not fix the problem with a new oil pump.

    The rear cam bearing is tough to line up properly, but if you don't get the holes in the right spot you will have the same problem immeciately. The holes in the rear bearing are for the oil to go through the end of the cam, out the back, and around into the lifter gallery. The most common problem with a new installation is that the holes are not lined up, so there is a lack of oil. The problem you have is that the cam bearings are needed for adequate oil pressure. I prefer to remove the engine so I can pull that plate off the back. I change the freeze plugs at the same time, including the ones in the back of the heads. When you put the rocker stands back on, 15 foot lbs is enough, and be careful to do them in order. These engines are made to be serviced in this manner and freshened up without doing the bottom end. The cam bearings tend to delaminate after about 30 years, regardless of use.


    All along the main oil feed are ports to which you can affix a gauge, just like the factory sending unit.

    Scout oil pump rebuild kits are avaialble, but not the new pumps. You could modify a loadstar pump if you pay attention to the pickup tube/screen geometry. The difference between the pumps in SV engines is the pickup tube, which is oil pan specific. The oil pans vary in order to compensate for clearances on the various vehicles. Scouts are unique. The pickups and travelalls use the same pump as the loadstar and other medium duty trucks.
    Allan E.
    Curmudgeon Extraordinaire
    Charter Member, Old Hippie IH Club
    Old fashioned binder freak

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