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Old 09-08-2019, 03:35 AM   #1
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Join Date: Sep 2015
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Year: 2002
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Chassis: Freightliner FS65
Engine: Caterpillar 3126E Diesel
Rated Cap: 71 Passenger- 30,000 lbs.
Is this CAT running too hot?

Since we have been in the high 90's and even into the 100's, I have noticed that our CAT 3126 runs quite warm. I know the engine is set up to run around 190 degrees to about 215 degrees. The water temperature regulators are dual 190 degree thremostats, per the factory stndard. The wastegate opens at 21.5 PSI plus or minus 05 PSI, thus the boost pressure maximum is about 21 PSI. The vehicle is 17000 pounds. There are two alternators powering a 13.5 kBTU Coleman Roughneck air conditioner through a 3000W inverter. When the air conditioner is turned on it increases the engine load by 2%. while at idle or a touch more than 1% at fast idle (1200 RPM).


I have a BlueFire J1939 adapter from which I pulled the following data (well, my wife pulled the data while I was driving):


Code:
Date: 09-07-2019
Ambient air temperature: 97 degrees

Time  Mileage  Speed  RPM  Coolant  Load  Torque  Boost  Intake  Tranny
17:51     0.0      0  747       97    12      21      0      99      95 Idle in driveway
18:00     0.0      0 1200      147     6      20      1     104     108 Fast idle w/ air on
18:06     0.0      0 1200      167     5      17      1     108     121
18:12     0.5      0  748      189    26      40      3     108     141
18:21     3.3     53 1892      199    15      53      8     109     155
18:27     7.0     63 2215      207    70     100     21     129     191
18:29     8.2     62 2174      223    59      93      8     122     195
18:30     9.0     37 1753      221    31      42      2     111     204
18:35    12.2     35 1274      221    47      68      4     108     215
18:39    14.0     43 1325      219    54      57      4     109     215
18:44    14.6      0  750      214     3       8      0     118     216 In driveway w/o air
18:57    14.6      0  748      192     2       8      0     117     201 Prior to shutdown
Any thoughts?
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Old 09-08-2019, 06:31 AM   #2
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How easy was it to install your BlueFire adapter? I'm thinking of getting one for my bus because I have the common problem where my dashboard occasionally freezes for a few minutes at a time, but I don't know if the BlueFire would fix this or if my BlueFire would then freeze up occasionally.
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Old 09-08-2019, 08:03 AM   #3
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the bluefire is as easy as plug it into the diagnostic port on the dash, load the app and go.. you can customize your own dash screens if you wantto use it as a tablet dash like i do in my bus..



as for this data.. yeah its running warm.. id have expected the fan to be blazing at temps of 220.. this is an FS65 you should really hear the fan... if its not running hard then you needto check some things..


1. is it as viscous clutch? if so is your coolant level correct and full? is your rasdiator free of debris?
viscous clutches use the AIR TEMP from the radiator to slowly ramp up and down.

it could also be going bad..


also if the temp spikes really quickly it can be a thermostat issue.. if it is a slow ramp up then I suspect the fan clutch or coolant level or radiaot debris..



-Christopher
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Old 09-08-2019, 08:20 AM   #4
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Quote:
Originally Posted by cadillackid View Post
the bluefire is as easy as plug it into the diagnostic port on the dash, load the app and go.. you can customize your own dash screens if you wantto use it as a tablet dash like i do in my bus..
Hmm, it sounds like this would not fix my intermittent freezing problem, then.
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Old 09-08-2019, 09:23 AM   #5
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Mine runs 180-190 under light load and 210-220 at full load.
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Old 09-08-2019, 09:55 AM   #6
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the OP is hitting in the 220s and not even 100% load factor
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Old 09-08-2019, 03:31 PM   #7
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Join Date: Sep 2015
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Engine: Caterpillar 3126E Diesel
Rated Cap: 71 Passenger- 30,000 lbs.
The data is AFTER replacing the thermostats, the overflow pressure cap, the fan clutch, blowing and washing the radiator and intercooler.


I have paced a piece of paper on the outside of the intercooler and the fan does draw the paper against the intercooler and holds it well ... at all locations aroud the intercooler.. Also, I have never heard the fan ROAR as others have noted.


I have heard the turbine spinning up from time to time.


The coolant level is proper and it does not puke coolant. The coolant is clean. I have also performed a water pump test by disconnecting the shunt line that feeds back into the overflow. This line does move coolant, but I can stop it with my thumb and minor pressure.


Notice in the data that as soon as I get rolling above 55 MPH the temperature starts to climb and stays elevated until a long duration at 45 MPH or slower.
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Old 09-10-2019, 03:52 AM   #8
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Join Date: Sep 2015
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Year: 2002
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Chassis: Freightliner FS65
Engine: Caterpillar 3126E Diesel
Rated Cap: 71 Passenger- 30,000 lbs.
Additional detail ... the heaters have been deleted and all of the hoses removed right into the engine compartment. This has the effect of reducing the amount of coolant in the system and thus the amount of cooling capacity.
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Old 09-10-2019, 06:46 AM   #9
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the heaters shouldnt affect it.. most busses run the summer months wit hthe heater valves closed all the time
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Old 09-10-2019, 07:56 AM   #10
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Year: 2001
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Engine: 3126b 210hp
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My transmission was low on fluid causing engine to run hot. 3126b/md3060
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