348/355 Thermostat | FerrariChat

348/355 Thermostat

Discussion in '348/355' started by m.stojanovic, Aug 8, 2015.

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  1. m.stojanovic

    m.stojanovic F1 Rookie
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    #1 m.stojanovic, Aug 8, 2015
    I found some info on the correct alternative thermostats (see pics) for 348/355. I have read that the 348 thermostat sizes are Flange 56, Height 33, Foot 32. What I got from a Ferrari parts supplier (at USD 120) is BEHR: Flange 56, Height 33, Foot 34.3 which appears to be BEHR B.296.82 (6.036.82). This thermostat is also used by Fiat 128 and X1/9 and Alfa. I couldn't find any seller on the net of the BEHR B.296 or 6.036 but I found WAHLER and GATES equivalents.
     
  2. m.stojanovic

    m.stojanovic F1 Rookie
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    #2 m.stojanovic, Aug 8, 2015
    Last edited by a moderator: Sep 7, 2017
  3. bikz

    bikz Formula 3

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    #3 bikz, Aug 8, 2015
    thanks stojanovic for the info.....
     
  4. ///Mike

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    #4 ///Mike, Aug 8, 2015
    +1. Thanks for sharing your research.

    Incidentally, the last time I bought a thermostat for one of my X1/9s I'm pretty sure it was under $12, and certainly nowhere close to $120.

    Let us know if you find a good stateside source for the Wahler.
     
  5. ernie

    ernie Two Time F1 World Champ
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    #5 ernie, Aug 8, 2015
    Last edited: Aug 8, 2015
    Nice info, and thanks for sharing.

    I ordered a "x19" thermostat a while back and it was the wrong O.D. (It measured 54mm). So just a headeds up if you order one.

    Also the Motronic 2.7 for the 348 has three different a/f mappings. Initial warm up from 0ºC - 60ºC (140ºF) the ECUs will richen up the mixture to help get the cats hot faster. Secondary enrichment is up to 80ºC (176ºF). Once the engine gets over +80ºC (176ºF) consistently the ecu's stop the enrichment process and go to the final a/f mapping.

    If you get a thermostat the allows the engine to run too cool it won't get out of the secondary fuel enrichment and will cause the cats to get over worked = possible slow down lights, potential prematurely failure of the cats, and maybe even difficulty passing emissions testing.

    So make sure you order the correct temperature thermostat. Personally I want my 348 running as close to a steady 190°F as possible.
     
  6. m.stojanovic

    m.stojanovic F1 Rookie
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    #6 m.stojanovic, Aug 9, 2015
    The Fiat thermostats p/n 4437481 or 4220309 (also Alfa) are the correct size (56 mm flange). The problem is that, as the 56 mm is less common, many suppliers just sell a thermostat of similar other sizes but with 54 mm flange (very common) for Fiat hoping that the buyers will not return it (it can fit with a thick rubber gasket). I read somewhere that Fiat/Alfa p/n 4220309 is for 87C thermostat but it is not; it is same as Fiat 4437481, i.e. 82C.

    It seems that the only source of 87C thermostat is BEHR 6.036.87 (same as BEHR 6.036.82, WAHLER 4033.82, GATES TH10881G1 etc.) but with 87C temp. However, I have been unable to find a source of it, or its equivalent, and for which car it is/was. Possibly, it was just an alternative to the Fiat/Alfa 82C thermostat (unfortunatelly, Wahler do not make/have 4033.87).
     
  7. Gialllo uno

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    #7 Gialllo uno, Sep 1, 2015
    I tripped across an old thread and it was referenced that for the 355 the Behr Numbers were as follows;

    Behr 1002000715 (two Versions 79C (174.2 F) and 87C (188.6 F)

    Autohausaz had them each for approximately $15.00 each. They also listed cross reference numbers for each.

    I am going to change out with the 87C and see where my gauge reads as I was definetly on the cold side during cruising steady.
     
  8. m.stojanovic

    m.stojanovic F1 Rookie
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    #8 m.stojanovic, Sep 2, 2015
    Behr 1002000715 is rather large I think (Mercedes). Flange 67mm, Height 26mm, Foot 43mm.
     
  9. Gialllo uno

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    #9 Gialllo uno, Sep 2, 2015
    I think you are right and I think I did not read the entire thread.

    I guess I would have found out pretty quick when I compared the two.

    Thanks
     
  10. cf355

    cf355 F1 Rookie

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    #10 cf355, Sep 5, 2015
    thermostats don't fail very often.....if the antifreeze is replaced regularly.
    before you go to the effort of replacing your thermostat....get a pot and
    put the thermostat and thermometer in and heat till the water boils.
    watch the temps and see if your thermostat opens and closes as it should.
     
  11. m.stojanovic

    m.stojanovic F1 Rookie
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    #11 m.stojanovic, Sep 27, 2015
    Last edited by a moderator: Sep 7, 2017
    I finally got my Wahler thermostat. It took Amazon more than a month to get it but it is a correct one.

    Behr (Italy) from Ferrari parts 82C (GBP 75):

    Flange: 56 mm
    Height: 33.5 mm
    Foot: 34.3 mm (flat)

    Wahler (Germany) from Amazon 82C (GBP 31):

    Flange: 55.6 mm
    Height: 32.5 mm
    Foot: 35 mm (dished, about 32 mm effective)

    As for the quality of workmanship, see the pics (Wahler is on the left).
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  12. ///Mike

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    #12 ///Mike, Sep 27, 2015
    Miroljub, this is Wahler part number 4033.82? What are the listed applications?
     
  13. m.stojanovic

    m.stojanovic F1 Rookie
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    #13 m.stojanovic, Sep 27, 2015
    Yes, it is Wahler 4033.82. Applications are Fiats X1/9, 128 and 130. Also see my first post here.
     
  14. lotusk

    lotusk Formula 3

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    #14 lotusk, Sep 27, 2015
    ....but this is the 82 degree C type.

    Isn't the correct rating 87 degs?

    Or too close to really matter?
     
  15. ///Mike

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    #15 ///Mike, Sep 27, 2015
    Thank you.
     
  16. m.stojanovic

    m.stojanovic F1 Rookie
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    #16 m.stojanovic, Sep 27, 2015
    The correct rating is 82C. Some people are looking for an 87C version, Behr 6.036.87, but I have not been able to find any source of it. Behr 6.036.82 is not available either (except from the Ferrari parts suppliers) but the equivalent Wahler 4033.82 and some other brands are (see my top posts).
     
  17. lotusk

    lotusk Formula 3

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    #17 lotusk, Sep 27, 2015
    Ok

    Thanks

    Good find
     
  18. Triple Black

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    #18 Triple Black, Oct 14, 2015
    Miroljub,
    My 348 temperature gauge was going between just left and just right of the vertical mark for the first year we owned it, of course we also drove it more. Recently I noticed it read much lower at highway speeds, the weather was cooler too. FYI I have had a few issues before, fuse blowing resulted in the replacement of the left fan. And I had a slight overheat issue. Maybe I put too much mix in the overflow tank which caused a purge. I bought a new Ricambi cap for around $30 give or take. Back to this post, it seemed like a lot of work trying to find a replacement thermostat, really don't most cars thermostats open about the same 185 F give or take, so I decided to just get one from Ricambi and now I know why. Are u ______#%^+€¥£ kidding $284.89. PN 165473 item 21 on the exploded view.
    There should be no reason for this price for such a simple, mass produced item.
    Ferrari and Ricambi (US Ferrari parts supplier) should be ashamed of themselves. I will of course read this and other posts for an alternative that makes $$$ sense. Thanks for starting this post.
    David
     
  19. 308 GTB

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    #19 308 GTB, Oct 14, 2015
    Last edited by a moderator: Sep 7, 2017
    Right. And it's a good idea to test the new thermostat before installing it.

    .
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  20. Qavion

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    #20 Qavion, Oct 14, 2015
  21. m.stojanovic

    m.stojanovic F1 Rookie
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    #21 m.stojanovic, Oct 14, 2015
    The problem is that the Ferrari 348/355 thermostat seems to be no more mass produced. It is used only by 348/355 and a few old Fiats up to 1989 and probably produced only in small numbers or by special orders. It took Amazon more than a month to get and ship the Wahler I ordered from them. The thermostat came in a brand new Wahler box so it was not a new old stock, possibly a small production run that Amazon had to wait for.
     
  22. ///Mike

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    #22 ///Mike, Oct 14, 2015
    Have you tested the replacement thermostat in real world conditions yet?
     
  23. m.stojanovic

    m.stojanovic F1 Rookie
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    #23 m.stojanovic, Oct 14, 2015
    No, at present keeping it just as spare which it may always remain. I have no issues with the original thermostat.
     
  24. Skippr1999

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    #24 Skippr1999, Oct 28, 2015
    Subscribe
     
  25. 8500rpm

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    #25 8500rpm, Feb 2, 2016
    Just got this from GT Car Parts in AZ.

    There is no obvious P/N on the unit. I have no idea when it was made or whether the supply chain is still alive.

    It says "Behr Thermot-tronik Italia," and has a crude "4M" and "82" stamping to hint at the opening temperature. Looking to get this into my F355 soon.

    [​IMG]


    Sent from my iPhone using Tapatalk
     
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