Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
  1. #1
    beachbum0286's Avatar
    Join Date
    Sep 2007
    Location
    Brigantine NJ
    Posts
    944
    +1
    1

    Possible Bad Riva Thermostat?

    I had an overheating problem on an RXPX. I thought it was a bad head gasket. I came to this conclusion when I saw the large coolant line that comes off the top of the head and goes to the top of the thermostat balloning very badly just giving it very little throttle. I figured boost was getting into the cooling system. I pulled the head and the gasket was fine it only had 30mins of use. I then thought that the thermostat was not opening causing the coolant line to ballon when I gave it throttle. I then checked the thermostat by submerging it in 175 degree water and it did not move. This is a Riva thermostat so I should have seen some movement. Has anyone else had this problem? Any opinions/suggestions?

    Thanks,
    Zach


  2. #2

    Join Date
    May 2008
    Location
    metairie,la
    Posts
    709
    Quote Originally Posted by beachbum0286 View Post
    I had an overheating problem on an RXPX. I thought it was a bad head gasket. I came to this conclusion when I saw the large coolant line that comes off the top of the head and goes to the top of the thermostat balloning very badly just giving it very little throttle. I figured boost was getting into the cooling system. I pulled the head and the gasket was fine it only had 30mins of use. I then thought that the thermostat was not opening causing the coolant line to ballon when I gave it throttle. I then checked the thermostat by submerging it in 175 degree water and it did not move. This is a Riva thermostat so I should have seen some movement. Has anyone else had this problem? Any opinions/suggestions?

    Thanks,
    Zach
    i'd say change the t stat if it didnt open in 175 degree water

  3. #3
    My riva thermostat packed it in also.i bought the rotax racing one and have had zero issues.i think it is a much better unit.

  4. #4
    BLACK MAGIC HEADERS hydrojunkie's Avatar
    Join Date
    Jun 2007
    Location
    new york
    Posts
    3,529
    +1
    3
    Bleed the air out of the system. Call me I will explain

  5. #5
    beachbum0286's Avatar
    Join Date
    Sep 2007
    Location
    Brigantine NJ
    Posts
    944
    +1
    1
    Quote Originally Posted by hydrojunkie View Post
    Bleed the air out of the system. Call me I will explain
    I'll call you tonight Jay.

  6. #6

    Join Date
    Jan 2006
    Location
    Florida
    Posts
    526
    had same problem went back to stock.

  7. #7
    beachbum0286's Avatar
    Join Date
    Sep 2007
    Location
    Brigantine NJ
    Posts
    944
    +1
    1
    So it has happened to people in the past. I guess I'll change out the thermostat. Any idea how to get the flange that you press over the billet nipple off?

  8. #8
    lextoy's Avatar
    Join Date
    Jan 2007
    Location
    Brigantine, NJ
    Posts
    1,883
    +1
    14
    zach i got a spare stock tstat housing, already split open, and 160 degree tsat(new) ready to put in, i wont be at the shore this weekend, but the weekend after, if you are not in a rush. i'll give it to ya for what i paid for it all, i dont really need a spare, you could sell your riva(after you fix it) and save some money...

  9. #9
    Fast & Loud meeper's Avatar
    Join Date
    Jul 2005
    Location
    West Grove, PA
    Posts
    5,019
    +1
    54
    my boy was having same issues with Riva T-stat, changed to rotax racing and walla bingo bango fandango!! Riva tried to say bad installation but that is such a load of u know what

  10. #10
    lextoy's Avatar
    Join Date
    Jan 2007
    Location
    Brigantine, NJ
    Posts
    1,883
    +1
    14
    is the rotax racing designed different??
    or just a stock housing with a lower temp tstat inside.
    if its stock housing, how does it get the oil temps up high enough for proper lube...
    when the stat opens at 131 isnt the oil gonna get cooled too much?

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 19
    Last Post: 09-11-2006, 08:00 PM
  2. Riva Thermostat instructions are WRONG
    By sr71bb in forum 4-Tec Performance
    Replies: 16
    Last Post: 09-10-2006, 10:20 AM
  3. Riva Thermostat
    By sc6365779 in forum 4-Tec Performance
    Replies: 3
    Last Post: 08-23-2006, 08:30 AM
  4. RIVA thermostat, Has anyone tested?
    By Therock in forum 4-Tec Performance
    Replies: 13
    Last Post: 05-14-2006, 08:32 AM
  5. Riva thermostat
    By Kinchyle in forum 4-Tec Performance
    Replies: 5
    Last Post: 03-13-2006, 07:23 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •