Engine/Transmission (1998.5 - 2002) NV-5600 lube temps...

[Gary - K7GLD]

I'd be interested in hearing what owners with manual transmission temp gauges see as to measured 5600 lube temps, especially under loads such as RV towing. I installed a temp sensor to the outer case of my own 5600 just prior to our recent 1500 mile RV tow down to California and back - the sensor was mounted below the lube line, and immediately behind the PTO cover:



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On our trip, typical temps were about 65* above ambient, which was about 85 degrees. Even the stiffest climbs never took case temps above 170 degrees with my setup - but I have no idea what the actual internal lube temps were...

 

[BPINE]

Hey Gary I have a friend that runs a temp gauge on his 5600, I welded a 1/8 bung in his PTO cover just like the one I had in my 4500. I will send him this thread so I don't botch up the #'s. I know his 5600 runs much cooler than my 4500 and he tows about 800 #'s more than me. We tow pretty heavy with 500 hp so this should give a good idea on the extreme side.



The coolers I posted about a few weeks ago I am convinced work well, Running empty last week it ran at least 30 degrees cooler and once the outside temp dropped so did the trany fast.



Blair

 

[Cliffman]

I'd be interested in hearing what owners with manual transmission temp gauges see as to measured 5600 lube temps, especially under loads such as RV towing. I installed a temp sensor to the outer case of my own 5600 just prior to our recent 1500 mile RV tow down to California and back - the sensor was mounted below the lube line, and immediately behind the PTO cover:



On our trip, typical temps were about 65* above ambient, which was about 85 degrees. Even the stiffest climbs never took case temps above 170 degrees with my setup - but I have no idea what the actual internal lube temps were...

My 6 speed (5600) has always run cool without any added cooling devices. I've been very pleased with it's performance. When hooked up to my 5er I'm pullen about 23. 7k GC and with the execption of one time (long story) my transmission temps never got over 185 at the highest. Pulling flat land it runs about 140-150.

 

[Mad Bomber]

17K truck, trailer going last summer Seattle Wa to Yrika Ca 12 hours truck running all day A/C doing the same. I got up to 200* but the day was 100+ I was also not the slow one in the right lane I kept it at around 70MPH

 

[jkidd]

150-160 empty no cooling device

 

[DWeiler]

150-160 empty no cooling device

Same here,tracks the rear diff-10. Loaded with the 11K fiver i hit 180-200 at 65MPH,all around towing,nothing to major in the way of hills---some average grades. This is taken from from the port in the Fast Cooler with one extra quart of fluid over spec as per Quad 4x4 recommendation---plus i have one of there manual filter kits on too. Outside air temp really comes into play as well,if it get close to 90"s it will run a bit hotter-----works both ways too cause when i go see the folks in northern Alberta/NWT in the dead of winter at -40/45C it takes about 45 minutes to even start to register on my 100-360 degree range gauge at highway speeds. DW

 

[Vaughn MacKenzie]

My NV4500 with probe in trans oil runs about 200-210 towing light travel trailer or car on a flatbed. But bucking some wind once and tackling a few grades in Montana on a 85F day with 17' travel trailer brought the temps up to 235F. No cooler on the trans.

 

[Bob Cochran]

I wonder what it would it will read here in Arizona and other places when the temp in the shade hits 115+.

 

[Mad Bomber]

I wonder what it would it will read here in Arizona and other places when the temp in the shade hits 115+.

That's just too hot



I'd bet that with extra capactiy of coolers it would be a little better

 

[steved]

Ummm, at 115*F it would read 235*F without coolers, around 200*F with coolers...

Mine runs really close to a linear 100*F over ambient unloaded at normal road speeds, until you are towing, speeding, or running really hot temps.

There are a LOT of variables... ambient temps, load, and speed all make the temps react differently. 235*F is the hottest I have ever seen at the PTO cover (actual oil temp, not case temp). I have not seen over 200*F since I installed the coolers.

Overfilling by a quart also causes them to run hotter...

I'll tell you after this weekend what towing 5k at 90*F+ temps results in...

 

[BPINE]

Just got a call from Cliffman the OAT is about 95 (Cliffman thinks it is 100 OAT but I know he is a few degrees shy in more than one way) and after 70 miles the trany temp is 177 and climbing slowly. This is towing the 15k fifth wheel. Rear dif temp is 166 with 354 gears.

 

[Gary - K7GLD]

WELL, with my setup, towing the RV, and OAT at 80* or so, the 5600 lube stays at about 135 in the flats, and increases to about 150 in the steeper grades. I have yet to see more than 170* at the extreme of grades/OAT.



Dunno if it's the added coolers, brand of lube, or what - I'm using the OEM 9224 spec lube - and of course, that's the transmission case temps, rather than direct lube temps...

 

[steved]

I just got back from camping... it mimicks being unloaded in the flats, but shoots up about 10-20*F when pulling a grade... still didn't break 200*F. That's only about 5000#s though...



Mine is actual oil temps, not case temps...

 

[DWeiler]

UPDATE---just came back from run up to our place at the lake---round trip is about 250 miles,hauling a 8x12 flatdeck loaded with supplies(around 4500 LBS total). transmission hovered around 180,rear diff was 170. On the way back trailer empty they both were at 160ish mark,tracking each other pretty close---OH YES, engine oil way at 190ish,i have a gauge for that too(taken from the port just on the left hand side of the ECM,usually does not move much except loaded HEAVY. DW