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  1. #1

    Riva 158F Thermostat replacement FOUND!!

    Just got my thermostat in from

    This is for a mercruiser 4cylinder with closed cooling. Basically the same as our rigs. I like the quality of this thermostat. It also looks to be made out of copper. It is a 160F and has the same size as stock.

    I'm also going to use a solder stick to melt off the tabs on the stock thermostat housing. I have VE's Riva cutting tool and a complete housing available if I screw up. After the tabs are off and I replace the thermostat I'm going to JB Weld it back together. Also taking the housing to home depot to find a good thick worm screw clamp for each hose.

    I'll post a how-to later with all the materials. Should be about 25 dollars

    I'll have this complete and tested soon. So you might want to wait before you go out and buy it.
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    Last edited by Kinchyle; 06-29-2006 at 04:27 PM.

  2. #2
    Good find Kinch!
    Looks like good construction and materials.
    Are the spring rates the same? in the pics looks like one spring has another coil? maybe just the way it is in the pic...PR...

  3. #3

    Join Date
    May 2006
    very interested in this out come!

  4. #4
    finally found it!

    but i'm already changed to RR with 285 buck

  5. #5
    Vman's Avatar
    Join Date
    Nov 2005
    Andy: one is the 160 deg. and the other is 190; I guess that's why the diff in the springs.

  6. #6
    You are the man ....

    to bad my ski's prolly about to get a new asthetic mod .... a for sale sign.

  7. #7
    HOSS's Avatar
    Join Date
    Aug 2005
    Kenner, LA
    Copper? You`ll be calling that tractor again. Brass my boy! Better not buy this unless you change your coolant every month and use only distilled water. Kanuck,,,,copper is made to fail son. Open up a boat dealership,,,you`ll hate brass.

    Have you posted this on
    under gearheads? NO! You`ll find your answer potna. I won`t post because I run without one.

    where`s that pic again,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
    ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,, wait
    ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,ahhhhhhh,,,thats good stuff right there,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,nighty night

  8. #8
    HOSS's Avatar
    Join Date
    Aug 2005
    Kenner, LA


    Damn bro,,,it also looks like you actually polished my thermostat up? What tha hell is that?

  9. #9
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    League City, Texas
    way to go !

  10. #10
    Kinchyle, you better test to see if JB weld will even stick to that kind of plastic. Some plastics are made in such a way that Epoxy(jb weld) won't stick. Put a dab on it, let it dry and see if you can pry it off. If its really stuck you should almost break the plastic before it pops off.
    Good luck, were all counting on you! (heard that somewhere before?)

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