Temperature Sensor Ranges

[RVTRKN]

Does anybody here on TDR know what the temperature ranges are, for the G56, front and rear diffs and the transfer case? Will be starting to add sensor modules and want to order the correct temperature range for the component I sensing.

 

[RVTRKN]

Guess not.

 

[ata]

I have been always told that 240 is the top temp for oil. 280 and the oil will burn and get black and really smell bad.

 

[Wayne M.]

I have been always told that 240 is the top temp for oil. 280 and the oil will burn and get black and really smell bad.

I kinda agree but the temp depends on the oil you're using. Recall the old Mobil1 commercial with the oils in the frying pan? The conventional burnt up and the Mobil didn't. That was probably over 300* anyhow. I know the allison trans temp gauges at my job go well into the 3's, don't know the shutdown setting though.

I'd say observe the characteristics and set accordingly.

 

[RVTRKN]

The question on range, is so I get the correct range on the gauge. I don't want to buy the sensor modules and then find out I'm over the range of the sensor, which will be a waist of money. I'm hoping to get the range, were the normal temp runs close to the middle of it.

 

[HBarlow]

Use a handheld temp guage like those purchased at Radio Shack to spot check temps when cold and when pulling heavy to obtain a basic operating temp range.

 

[JMetzger]

Do what Harvey said our use a Laser Thermometer, That is what I use.

 

[AH64ID]

I would get the lower range, 100-280°. The thing about diffs/trans is there is no "normal" range, like coolant, it's more like boost/egt where it swings based on load, but not as fast. Meaning on a cold winter day empty you may never see the gauges come off of 100°, but on a hot summer day towing the RV at 65 it may be at the right 1/3 of the gauge. Without something regulating the temp there is no way to keep it in the middle.



But really, do you need them? If you spend the same cash on covers/coolers you would be better off and never worry about heat anyhow.



I really like gauges, I have 5 analog and 1 digital (with 6 OBDII readings displayed), but have never been able to justify the cost of trans/diff temp gauges. I have read about the temps they run with cooler (MH front/rear, and fast coolers on the trans) and it's not an issue.

 

[Prairie Dog]

I had the 280 range gauge on my last DC and it worked fine. Never got anywhere close to the top.

 

[goodguys75]

I think diff temp is the last thing i would worry about... ... . unless you are driving over 200 mph...

 

[mwilson]

I think diff temp is the last thing i would worry about... ... . unless you are driving over 200 mph...

Or towing 50,000 lbs... ... .



But, in reality you can catch a bearing failure or other issues by having said gauges.



I just did a yard check, any Freightliners on the lot that have temp gauges use a range of 100-300 degrees. That applies to engine oil temp, transmission temp and rear axle temp.



Mike.

 

[S.Morris]

Food for thought. Years ago when I was in transmission business (Class 8 stuff). a Fuller engineer told me that the actual temp at point of gear mesh is 50% higher than the actual oil temp in sump. A good reason to get into direct gear for hard pulls.



+1 on the fact that temp guage can clue you in to possible bearing early failure symptoms, if you are in tune to what normals for given loads at given temps always were and now changing

 

[RVTRKN]

Thanks mike, that was what I was looking for, the PLX fluid temperature sensing module as shown in the pic, is what I will be purchasing. The sensor's I plan on installing, is the EGT, boost, trany cooler with the sensor, transfer case sensor, and diff's covers with sensor's, when I pull my trany to convert the DMF to the SBC DD3250. There will be no need of gauge pillars or clumsy gauge sets where they look out of place and take up room in an already crowded cockpit. goodguys75, I can install a lot more and look at them on my NAV radio if so chose to, and my drivers side dash remains the same as it is now as in the pic shows.