Oil temperature Sensor 104628 Replacement | FerrariChat

Oil temperature Sensor 104628 Replacement

Discussion in '360/430' started by Kevin Rev'n, May 2, 2016.

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  1. Kevin Rev'n

    Kevin Rev'n Two Time F1 World Champ
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    #1 Kevin Rev'n, May 2, 2016
    Last edited by a moderator: Sep 7, 2017
    I was very disappointed in what I could find for threads dedicated to replacing this so I am making one. Last time I drove my car I noticed that my oil temperature gauge was acting strange so I am going to replace the sensor and hope that was the problem.

    I read enough to find out that the under tray needs to be removed to access it so I took mine off only to find that it looks like it goes right into the oil sump! Maybe this should have been obvious but now I am in a holding pattern until I stock up on oil to drain it and replace the sensor! New filter too? Yeah.... Here are some reference pics.

    I am reminded of my awesome decision to buy a garage queen every time I remove some car parts to find a nice clean area to work.

    I will update this as the work progresses. Does anyone know if it is sealed by use of an O-Ring or special washer? I do not have so I want to make sure before the oil gets here.
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  2. Kevin Rev'n

    Kevin Rev'n Two Time F1 World Champ
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    Does anyone know the torque spec for this puppy? I found a spec for the water temp sensor and I think it is the same part. It is showing 16 nm in the WSM. Does this sound right?
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

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    We change those all the time without changing the oil. Done properly you wont lose a cup of oil.
     
  4. Kevin Rev'n

    Kevin Rev'n Two Time F1 World Champ
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    Thats good to know. Whats the torque setting my good man? Gudentite?
    Does 16 nm sound right? It's a brass part into an aluminum sump so I was a bit curious about the setting. I am going to check the torque on removal and see if that is in the ballpark.

    That reminds me of the first time I saw an old school plumber swap my gas stove in a condo. No need to go and find the wrench and shut off the main! I watched as he two handed a swap with a touch and skill somewhere in between F-1 pit stop crew member and war time trauma surgeon. I still remember the whoosh of the gas into the room through the 1 1/2 stub out. I knew instantly that I wanted no part of that.

    I don't mind the oil change. It's due for one and I have been meaning to start doing these myself and get more involved with the car.
     
  5. hessank

    hessank Formula 3
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    #5 hessank, May 10, 2016
    Last edited: May 10, 2016
    So what, next you're gonna say you always open the breaker when you change a light switch or wall outlet, lol?
     
  6. Rifledriver

    Rifledriver Three Time F1 World Champ

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    Well its a hollowed out brass fitting with rather thin walls and a pipe thread. I have no idea if there is a torque spec but it would be very low.
     
  7. metaldriver

    metaldriver Formula Junior

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    What was your oil temperature gauge doing ... bouncing around, staying near zero too long (relative to water temperature being at its normal reading), pegging the gauge to cause the red light to come on (relative to water temperature being at its normal reading), all of the above?

    I'm told the most common culprit is the oil pan sending unit; however, sometimes the problem could be behind the gauge in the instrument cluster.
     
  8. Kevin Rev'n

    Kevin Rev'n Two Time F1 World Champ
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    Great timing Andy! I just returned from my first drive since I started this thread. My gauge was doing weird stuff like dropping to the far left after 1/2 hour of driving and then reading normal for a few minutes and wavering around between normal and a cooler reading. The new sensor is great. Rock steady! Just went for a nice long 1/4 tank of gas drive and had a blast. What a car!

    Take a month off from driving if you think that you are outgrowing your car. Sweet, sweet machine. I will scour my camera chips for any pictures that will help the next guy but doing this with an oil change and getting a chance to detail my car's underside, and check the clutch disc thickness was good therapy. One thing that is strange is that I noticed to get a replacement from Ricambi it says to call them. This is odd to me since the part is rather cheap and I believe common to a few cars. I wonder what the deal is?

    I never found the torque spec so I put a torque wrench on it during removal and it was about 25 nm to get it started so I torqued the new one up to about that value. Like RD said it's a pipe fitting so snug and a flat was about right there. Also I never located this part in the WSM so I didn't see what should be used to seal the threads. I used some high temp honda bond on the threads but there is probably a Ferrari specific product that I would like to know about maybe for next time.
     
  9. Kevin Rev'n

    Kevin Rev'n Two Time F1 World Champ
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    #9 Kevin Rev'n, May 16, 2016
    Last edited by a moderator: Sep 7, 2017
  10. Kevin Rev'n

    Kevin Rev'n Two Time F1 World Champ
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    #10 Kevin Rev'n, May 16, 2016
    Last edited by a moderator: Sep 7, 2017
    Some comparison shots of the old and new.
    They had some different markings. Hopefully they are the same tolerance and quality. As it stands my long drive yesterday had the temp displaying the same as it always had prior to the strange readings. I am calling it good.

    That is to say, takes a good long while to get that oil up to temp! Since I always wait until I get up past 150 degrees or so with my oil before I start shifting at higher RPM's I take notice of this! We do benefit from the Ferrari racing heritage here with a serious oil cooling system.
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  11. metaldriver

    metaldriver Formula Junior

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    The pictures depict that the temperature sending unit threads into the transmission* as well as this diagram.

    PUMPS AND OIL SUMP - Ricambi America, Inc.

    How does the sending unit know to sense engine oil instead of transmission gear lube?

    *The location of the axle implies that is the transmission housing, correct? The description for part number 104628 reads "Gearbox Thermister". Is this unique to how Ferrari labels things?
     
  12. Mr. Uy

    Mr. Uy Formula Junior
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    Hi, I saw the @Rifledriver post above in regard to removing this without draining the oil 'if done correctly'. Anything specific on doing this correctly? I plan on doing mine soon. Thanks!
     
  13. Rifledriver

    Rifledriver Three Time F1 World Champ

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    Work quickly? Do it on a cold engine. We replace damaged plugs and bad sensors all the time without draining perfectly good fluids.
     
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  14. Mr. Uy

    Mr. Uy Formula Junior
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    Ha, ok great! I can give that a try. Thank you sir!
     

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