faulty transmission temp. reading

[pattypape]

Hi Bob,

On our 88FC, we have the ZF transmission. The ZF Trans.temp gage is
very different from the engine oil temp gage and the rear axle temp
gage. I do not know if these part numbers will solve the problem you
are having with your 1993 Transmission gage.

I went through this same discussion with the BB parts people.I even
purchased a Napa temp sensor for the rear axle, based on the
supplier part number, that BB used in 1988.
Again we had the very high temp readings of 250 to 300 degrees.

So, I contacted Teleflex, They have a great web site at
http://www.tflx.com.
The gages and sensors are listed. They have a tech trouble-shooting
guide that makes it easy to isolate the problem. It is a simple
circiut to trace. There is also an issue with the tread size of the
sensors, therefore Teleflex lists four different sensors 1/8, 1/4,
3/8, or 1/2 inch diameter.

These part numbers are for the Cat, the Onan and rear axle oil temp.
BB oil temp gage # 3865334 crosses over to Teleflex # 9153278

The gage supplied by BB is different than the original gage, but
carries the same part number.
The latest gage has a different scale on the face that requires a
sensor change to match the impedance.
Teleflex recommended that, I purchase a Stewart-Warner sensor to
match the gage.
The Stewart-Warner part # is 280EE-F. It comes with three threaded
inserts to fit all thread sizes. After installing the Stewart
Warner sensor, The BB/Teleflex gages reads normal.

It was difficult to find a Teleflex dealer, I purchase gages from
BB, the price is reasonable.
The Stewart-Warner sensor was purchased from a truck parts store.
(e-mail if you need this phone number, they will ship UPS)
West Marine and Boaters World carry some Teleflex items.

Now, our rear axle temp, oil temps, and oil pressures on both the
Cat and the Onan read correctly.

We like the scaling of the original old gage to better read the much
lower axle temp

Hope this helps,

Bill 88 FC, Love the upgrade to an FC,
7.4 mpg last 3500 miles with little Onan time.



--- In WanderlodgeForum@yahoogroups.com, "Bob & Carol Howald`"
wrote:
> Bill: That's what I've been thinking. I've called parts and asked
> questions about matching the gage with the sending unit. They have
> assured me that I have the matched pair. The old gage said
transmission
> temp. on it but this new one say's engine oil temp and is
calibrated
> differently on the face. BB say's this is the only temp gage
avilable
> for the tranny. Iam going to do more looking into it the first of
next
> week. Send your part # please.. Thanks for the info.. Bob 93pt
Ill.