F1 Gearbox Failure Warning Lt

Ya but what else did you have to take off? cooler lines that run right beside the sensor, C/V boot cover and do you have cats on your car? Plus remember sometime's they can be real tight.

 

True if you have a lift you don't have to take the wheel off.But most guys don't and i don't get under cars that are on jack stands.I said to take the wheel off for the guys that are doing it at home.

 

It's not a big deal. I did mine awhile back. Changed the gear box fluid while I was at it.

Jack stands and in through the wheel well. Nothing more than a wrench. Hell, I don't even remember the size. Took like 15 minutes, and that included refilling my glass of wine.

 

I honestly don't remember but I didnt have to make a special tool to do it.

 

Steve, I thought you'd already sorted out your problems?

That's the one under the gearbox. It determines the gearbox input shaft speed... probably has something to do with clutch engagement control. The relative speeds of various rotating parts affect the way the clutch engages. I recommend reading the manual... It's a little technical, but if you read it a few times, it starts to sink in

This is the one which provides speed signals to the speedo, the engine ECU, the suspension ECU and the F1 ECU. It seems that a failure of this item would be easy to diagnose (unless it was very intermittent). With the potential to affect so many systems, however, I'd want to make sure it was in good shape. Of course, you would look for obvious faults with it first... contaminated connector plug, wiring insulation wearing away, etc. The wiring sheath contacts the oil lines, so you would want to make sure this was ok. I was surprised how grubby mine looked (despite the rest of the engine bay looking fairly pristine). It's not covered with an underbody panel and close to heat sources and also might get oil contamination from leaking cam seals.

 

Air conditioning is weak, but I don't use it much up here in the NW. Heat worked fine. I checked the fuse (10A, #24 in the footwell fusebox) today and it's good.

Will be proceeding with the speed sensor replacement and see if that fixes the problem - as soon as I get a round tuit.

I really appreciate all of the guidance and information that I received on this thread.

 

Let us know the outcome.

 

I have.
However the clutch is pretty shot so I'm going to get that replaced in a month or so, and I figured while they are there for the sake of a few hundred $ it might be worth replacing these sensors too.

Then virtually everything in the system will be new and will hopefully last another 18 years without any dramas.

Thanks for the explanation of what the sensors do.

 

You can make this in about a min .
If you have a lift you don't have to remove anything.If your using jack stands remove the wheel.I like to do things the easy way.
Michael
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Nice i figured something like that. Kinda like my O2 sensor remover socket.

 

My 91 year old father just whipped up one for me... so no excuses for not making your own, guys...

Just a thought though... I had a look at a 32mm "deep" socket today and I wouldn't be surprised if the whole plug and wiring wouldn't fold up and fit inside the socket. No cutting involved. I wasn't willing to pay to find out though

 

I don't recall requiring a socket to remove the speedo sensor. I just used an adjustable wrench IIRC. Or an open or closed end....

 

It was a worst case scenario, Hugh... The poster of the tutorial did have problems

https://www.dropbox.com/sh/kufk5c92mfqd50n/AABQnT5MSW3R2UiMRKvZkoNfa/Ferrari%20DIY/F355%20Speed%20Sensor%20Replacement.pdf?dl=0

 

It took awhile, but followed Myles Kitchens' procedure and am pleased to report that all was well on my 40 mile test drive this morning. Felt good to sweat, swear, and get my hands dirty - feeling more at one with the machine, and loving my car again

And I am now the proud owner of a 32mm speedometer sensor removal socket, which we fabricated at a local shop.

Learned alot from you guys.

Thanks
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Congratulations. Glad to hear you survived.

Another FChat win

P.S. Can you confirm the part number of the new sensor?

 

From Ricambi: Table 31, Item 34, p/n 149095, Sensor/Speedo (Giallo-12V) @ $272.49

 

So what’s the conclusion?

Attack from top or bottom?

Special/modified socket or wrench? I might consider a deep 32mm socket.


Torque spec if any?

 

I believe I used a 32mm open end wrench. I was lucky to pick up a huge selection of USAG wrenches for like $1 each at a Griots Garage annual "Garage Sale" event. I wasn't sure I would ever need wrenches that large, but for $1 each...what the heck?! I must have 25 of them in various sizes. That was a loooong time ago, but I believe I reached from above...but don't recall clearly.

If you want to use them, I can mail them to you....but would want them back please.
Unless you can find something similar at Harbor Freight.
https://www.harborfreight.com/v-groove-metric-combination-wrench-set-14-piece-63063.html
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Just saw this. I appreciate the offer. Just bought a few 32mm sockets and going to modify. Should be quick.

 

Sounds good. It was the closed end wrench on the left I used. Probably the one and only time I ever used it.