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  1. #1
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    Default 5.7 mercruiser thermostat housing

    I have a 1995 raw water cooler 350 mercruiser, took off thermostat housing p/n 16413-c1 stamped has no check balls. The thermostat sits on a lip within the housing has cork gasket then thermostat the plastic sleeve. Ok so after I pulled the housing off I notice the cork gasket was slipped out of the lip, upon further investigation I noticed that the LIP has an open where the water the water enters from the large hose, this is looking at the housing upside down, question is this normal? Why did the cork gasket slip out? The thermostat I changed last year!

  2. #2
    Moderator Bondo's Avatar
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    Default Re: 5.7 mercruiser thermostat housing

    Why did the cork gasket slip out?
    Donno,... Never seen a cork gasket on a Mercruiser...
    Any Grease is Better,..... Than No Grease at All.......

  3. #3
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    Default Re: 5.7 mercruiser thermostat housing

    The gasket is like an O ring but flat, Is there supposed to be an opening on the lip?

  4. #4
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    Default Re: 5.7 mercruiser thermostat housing

    Anybody else?

  5. #5
    Lieutenant Commander Alpheus's Avatar
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    Default Re: 5.7 mercruiser thermostat housing

    Which Gasket???



    1969 StarCraft Chieftain, 4.3 Mercruiser Alpha One Gen II

    Link To Restoration Page


    ----------------------------------------------------

    Its What I Don't Say You Should Be Worried About...

  6. #6
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    Default Re: 5.7 mercruiser thermostat housing

    That would be E the O ring!

  7. #7
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    Default Re: 5.7 mercruiser thermostat housing

    anybody ?

  8. #8
    Moderator Bondo's Avatar
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    Default Re: 5.7 mercruiser thermostat housing

    The gasket is like an O ring but flat, Is there supposed to be an opening on the lip?
    Ayuh,... In the O-ring, or the Housing,..??

    Yer so talkative, I Assume We're talkin' about the top picture Alpheus posted,..??
    Any Grease is Better,..... Than No Grease at All.......

  9. #9
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    Default Re: 5.7 mercruiser thermostat housing

    The housing has an open space around the lip, in other words the "lip" where the theromstat sits in in not completely round. Thanks for the response!

  10. #10

    Default Re: 5.7 mercruiser thermostat housing

    Quote Originally Posted by JOHNSON110 View Post
    The housing has an open space around the lip, in other words the "lip" where the theromstat sits in in not completely round. Thanks for the response!
    Maybe a few photos of both the inside/outside of your thermostat housing would help everyone out.

    What is the engine serial number?

    Is it carbed or EFI?

  11. #11
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    Default Re: 5.7 mercruiser thermostat housing

    I have no idea what JOHNSON110 is talking about, but I'm guessing wildly it looks something like this, and yes it's suppose to look like that


  12. #12
    Lieutenant Commander Alpheus's Avatar
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    Default Re: 5.7 mercruiser thermostat housing

    Nope.

    Its the one in the pic I posted...


    1969 StarCraft Chieftain, 4.3 Mercruiser Alpha One Gen II

    Link To Restoration Page


    ----------------------------------------------------

    Its What I Don't Say You Should Be Worried About...

  13. #13
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    Default Re: 5.7 mercruiser thermostat housing

    This was going to be tough to explain I knew that, The engine is a carb 4 bbl the housing looks like the one with the check balls, but this one does not have the check balls! the lip I am talking about is where the thermostat sits in, It looks like part of the lip is worn away? or should it be this way? like I said before the flat round gasket that goes into the housing before the thermost goes was hanging out whaen I pulled the assembly off! Again the thermostat sits on a lip in the housing if the lip was not there it would fall into the manifold, well part of this lip is either worn away form the salt water or it is designed that way, this what I am trying to figured out, diagrams do not show the idisde of the housing in detail .

  14. #14
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    Default Re: 5.7 mercruiser thermostat housing

    Ok I found out that the housing is designed that way, however you should use adhesive on the cork gasket so it does not slip out!

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