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Hot!No oil pressure at idle

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pottsmog
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2018/11/15 23:00:41 (permalink)
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No oil pressure at idle

Just installed rebuilt Pinto into mk2 van.  Started it up and oil light stays on. Shut it down immediately. Removed oil pressure sender and screwed in a pressure gauge, no pressure on idle, but jumps up if given a quick rev. 
Any suggestions?
Hate to think of having to remove the engine and strip again.
#1


23 Replies Related Threads

    SFE
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    Re: No oil pressure at idle 2018/11/16 09:24:23 (permalink)
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    Hate to say it, but first thing that comes to mind is bearing clearances in the bottom end. Was the crank reground? Or loose oil pickup pipe maybe?
    SFE
    #2
    Chuff
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    Re: No oil pressure at idle 2018/11/16 13:04:32 (permalink)
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    What grade of oil did you use?
    #3

    pottsmog
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    Re: No oil pressure at idle 2018/11/16 18:57:09 (permalink)
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    Thanks guys     I used 15/40 oil    the crankshaft was checked by engine rebuild workshop   although I must admit that because the engine was completely original I didn't mic the shaft and installed std bearings   something to think about.   I was hoping somebody may have had an easy answer that would not mean pulling the motor out   Is it possible to drop the cross member to remove the sump?
    #4
    RS3100Markie
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    Re: No oil pressure at idle 2018/11/16 20:22:38 (permalink)
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    Do you still have the old bearings, as normally they’re marked if oversize/undersize.
    #5
    pottsmog
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    Re: No oil pressure at idle 2018/11/16 22:02:34 (permalink)
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    Yes will check (old bearings) tomorrow
     
    #6
    PeterM
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    Re: No oil pressure at idle 2018/11/17 07:25:32 (permalink)
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    In my opinion 15/40 is too thin for these older design engines.
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    pottsmog
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    Re: No oil pressure at idle 2018/11/17 22:56:42 (permalink)
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    Std bearings - took tappet cover off,   at idle almost no oil coming through onto cam.   
    Any way of taking the sump off without pulling motor,   I have a grinder and welder
    #8
    ronsmallford
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    Re: No oil pressure at idle 2018/11/18 17:40:21 (permalink)
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    PeterM
    In my opinion 15/40 is too thin for these older design engines.


    I use penrite hpr30 in my 2000 ohc. If your low pressure is because of any increased clearances this could well fix it.

    "Horsepower loves the absense of weight" (from Elfin ad)
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    #9
    Flighter
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    Re: No oil pressure at idle 2018/11/18 18:11:48 (permalink)
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    ronsmallford
    I use penrite hpr30 in my 2000 ohc. If your low pressure is because of any increased clearances this could well fix it.

    As do I. It has  the added bonus of a high amount of zinc in it to protect the cam followers.

    WTB: Recaro seat - any condition considered
     
     
    #10
    pottsmog
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    Re: No oil pressure at idle 2018/11/19 10:30:09 (permalink)
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    Really shouldn't be any excessive clearance, engine has just had full rebuild. Will try heavier oil but not optimistic.
     
    Has anyone got an oil gallery plan for pinto, I took the filter off and turned motor over and had plenty of oil come through at the filter port.  I would presume that the next gallery outlet is where the oil sender unit is and there is very little oil on idle coming out of that port. 
    Is it possible to have a blockage in the oil gallery and if yes how would I remedy with motor is car?   Any suggestions gratefully received.
    Ps forgot to say I replaced the filter in case there was an issue there but no change
    post edited by pottsmog - 2018/11/19 10:34:45
    #11
    blue74
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    Re: No oil pressure at idle 2018/11/20 19:10:54 (permalink)
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    Were the oil gallery plugs removed when the block was chemically cleaned?
    If they are missing = no oil pressure.
    There is another one at the rear of the block however would produce an external oil leak.

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    #12
    pottsmog
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    Re: No oil pressure at idle 2018/11/20 22:49:14 (permalink)
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    thanks blue474 that is an interesting point. I know all the welsh plugs were missing when the block came back.  Where are these oil gallery plugs, I cant visualise the section in the photo. Auxiliary shaft bearing?
    #13
    blue74
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    Re: No oil pressure at idle 2018/11/21 04:27:50 (permalink)
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    You are correct it is the auxiliary shaft bearing.
    #14
    gazz
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    Re: No oil pressure at idle 2018/11/22 13:42:48 (permalink)
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    dare say they would have taken all the plugs out of everywhere to clean. thats a good place to start looking.
     
    15/40 wt oil should be fine, unless you bearings have too much clearance.... 
     
    in answer to your question about dropping the sump. it can be done. i think, when i did it a really long time ago, i dropped the steering rack off and there was enough clearance. but i may have held the engine up and dropped the crossmember a little. cant remember exactly.
     
    instead of turning the engine by hand or starting to test oil pressure, get yourself a 6mm socket on a long extension, take the distributor out and spin the oil pump using the socket on the end of a drill down the distributor hole. i used to do this all the time to pump oil around the engine before starting if it had sat for a while, or after i had the engine out.
    #15
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