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The Mariah Owners Club » Maintenance and Repairs » Mercury MerCruiser

low oil pressure

Mercury MerCruiser

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Old 06-03-2014, 02:38 AM   #1

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Default low oil pressure
First off let me say hello to everyone. I am a new owner of a 1992 mx19. Love the boat. Took it out for the third time today. Noticed the oil pressure gauge bouncing all over the place, then dropped to zero. I shut it down. Oil level ws fine, engine ran and sounded good. Went ahead and tubed for two hours with no issues. Wanted to get you thoughts as to causes. I am thinking a bad gauge. Engine is 4.3lx. Looking forward to many years to come with this boat. I will post pics after I get her cleaned up a little more. Oh, first time boat owner. Thanks!
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    • Old 06-03-2014, 03:13 AM   #2

    mikeyt is currently offline
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    Default Re: low oil pressure
    Welcome aboard! Its not likely a bad gauge but more likely a poor ground connection. Check & clean the wiring connections at the gauge, the ground connections at the fuse box (up under the dash against the side wall) and the connections at the oil sender unit.
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    Old 06-03-2014, 03:17 AM   #3
     
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    Default Re: low oil pressure
    Welcome to MOC dusty!
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    Old 06-03-2014, 03:18 AM   #4

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    Default Re: low oil pressure
    Thanks for the quick reply. I will do that this week and post ow it goes when I take her out Saturday. I have other questions, but will spread them out so I don't bombard ya'll,
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    Old 06-03-2014, 03:22 AM   #5
     
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    Default Re: low oil pressure
    We ain't scared.........fire away!
    The guys are always ready to help out.
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    Old 06-03-2014, 02:14 PM   #6
     
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    Default Re: low oil pressure
    If cleaning the grounds @ the gage does not work for you then check the connection @ the oil pressure sender on the motor. If you see oil on/around the sender then it may need to be replaced. The internal diaphram will sometimes leak, oil gets on the resistive sensor and will cause the exact symptom you described.
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    Thank you Hudson River Steve for this useful post!
    mikeyt (06-03-2014)
    Old 06-04-2014, 02:17 AM   #7

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    Default Re: low oil pressure
    Where is the sender located?
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    Old 06-04-2014, 02:37 AM   #8

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    Default Re: low oil pressure
    Quote:
    Originally Posted by dusty72 View Post
    Where is the sender located?
    I believe it's located on the starboard side of the motor right below the last spark plug.
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    Old 06-04-2014, 02:40 AM   #9
     
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    Default Re: low oil pressure
    Mine is port side just above the oil filter.
    One for gauge , one for low oil shutoff.
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    Old 06-04-2014, 02:43 AM   #10

    mikeyt is currently offline
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    Default Re: low oil pressure
    Quote:
    Originally Posted by ColoradoDiablo View Post
    Mine is port side just above the oil filter.
    One for gauge , one for low oil shutoff.
    You're likely accurate with that. I 'think' it was moved in later incarnations of the 4.3 and i'm trying to work from memory which at my age, gets a little faulty at times.
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