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  1. #1

    Default White Smoke 502 GM

    Common 502 GM block, 8.2L engine

    Hello,

    i use on my commercial Jetboat a 502 GM engine. Since yesterday he make white smoke from the exhaust.

    How the Problem starts:

    - i tok the boat from lift and make a slowly warm up. it smell gasoline (not extremly, prehaps etwas more than usual.)

    - reach the boarding dock, i refuele the tank gasoline - after i start the enginge

    - take the guest und go slowly the chanel and start the trip, press the pedal to 3200 rpm, its comes a clanking/clapper/rattle noise, when i reach the rpm the noice stopped, (as soon i don't push on the gas pedal) the noise disappears.

    - then the smoke starts,


    *********

    Link Dropbox:

    https://www.dropbox.com/sh/8lh295ugr...glThQIk1a?dl=0




    Attachment 15306
    Attachment 15307

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,761

    Default Re: White Smoke 502 GM

    white smoke in the exhaust usually means coolant is entering the combustion chamber.....being as your exhaust is 'buried' below the water line, its hard to say if that's the case here....especially if its a raw water cooled setup.

    can't say I got much out of the videos....

    Any 'sheen' on the water (fuel) with the engine running??

  3. #3

    Default Re: White Smoke 502 GM

    Hi Makomark,

    i will try to get betetr videos when the exaust out of the water. yes it pall behind exaust maybe oil or gasoline. i will try to check this tooClick image for larger version. 

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    Last edited by captmorgan; 05-01-2017 at 09:40 PM.

  4. #4

    Default Re: White Smoke 502 GM

    Quote Originally Posted by makomark View Post
    white smoke in the exhaust usually means coolant is entering the combustion chamber.....being as your exhaust is 'buried' below the water line, its hard to say if that's the case here....especially if its a raw water cooled setup.

    can't say I got much out of the videos....

    Any 'sheen' on the water (fuel) with the engine running??
    Hi Makomark,

    i will try to get betetr videos when the exaust out of the water. yes it pall behind exaust maybe oil or gasoline. i will try to check this too Click image for larger version. 

Name:	2017-05-01-PHOTO-00002111.jpg 
Views:	7 
Size:	33.0 KB 
ID:	15312

  5. #5
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    2,707

    Default Re: White Smoke 502 GM

    pull plugs and take a look, What's the oil look like? Is the level ok? Is it burning off?

  6. #6

    Default Re: White Smoke 502 GM

    Jonnygir, i will check tomorrow. Before i make this day the trip oil and level was ok. the filter of carburator got black

  7. #7
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    2,707

    Default Re: White Smoke 502 GM

    A compression test is warranted next!

  8. #8

    Default Re: White Smoke 502 GM

    Quote Originally Posted by johnnygjr View Post
    A compression test is warranted next!
    hi make yesterday the compression test is between 90-115. Attached pictures. But now i put the boat in the lift in level an i find to much oil in the pan. see pic. Click image for larger version. 

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ID:	15342Click image for larger version. 

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  9. #9

    Default Re: White Smoke 502 GM

    Click image for larger version. 

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ID:	15344

  10. #10
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,761

    Default Re: White Smoke 502 GM

    what's the level of coolant in the heat exchanger? why is the hose to the overflow bottle kinked?
    the "wet" pic of the dipstick appears out of focus - any indications what has raised the oil level?
    You compression numbers are marginal but don't know how your test was done.....

    given the few pieces of data, I'd be inclined to start the diagnosis for a head gasket leak via a leakdown test or a pressure tester on the HX.....

  11. #11

    Default Re: White Smoke 502 GM

    Quote Originally Posted by makomark View Post
    what's the level of coolant in the heat exchanger? why is the hose to the overflow bottle kinked?
    the "wet" pic of the dipstick appears out of focus - any indications what has raised the oil level?
    You compression numbers are marginal but don't know how your test was done.....

    given the few pieces of data, I'd be inclined to start the diagnosis for a head gasket leak via a leakdown test or a pressure tester on the HX.....
    Hi its works the test? The hose was knigged because was not complet close.

  12. #12

    Default Re: White Smoke 502 GM

    I make the compression test again was 125-135.

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