3406E low water temp - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 02-05-2011, 08:13 PM Thread Starter
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3406E low water temp

During the day sunshine is 180*, is this too low? as son as the sun goes down, it goes to 190*, I know 190 is ok, but should I worry about 180*.
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post #2 of 15 (permalink) Old 02-05-2011, 08:39 PM
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What you want to do is test the system, from cold you need an infrared temp gauge, and a cover for the radiator, start it up and run it as fast as you feel comfortable with, monitor the top rad pipe it should stay cold test the oil cooler housing for temperatures when the top rad pipe gets warm that is the thermostat opening temperature. If it leaks coolant then either the thermostat is open or the seals are worn out, and need to be changed, next you test fan in temp and fan out temp. From memory an "E" is 220 to 225, fan in, and around 210 fan out. These engines are made to run above 200 degrees and do not like running cold, it will cost you a lot of fuel, and wear.

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post #3 of 15 (permalink) Old 02-06-2011, 12:42 AM
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Don't worry about 180*.

Odd it goes to 190* in the evening.

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post #4 of 15 (permalink) Old 02-06-2011, 12:58 AM
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my 1lw runs 180 on the temp.

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post #5 of 15 (permalink) Old 02-06-2011, 01:16 AM Thread Starter
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my 1lw runs 180 on the temp.
yeah mine is 1LW too
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post #6 of 15 (permalink) Old 02-06-2011, 01:54 AM
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You can run it how you want , but an engine that is made to run at above 190, with a minimum 7 lbs rad cap, that is the thermostat opening temperature has low oil temperature and things like the piston does not grow to the proper shape until certain temperatures, are reached and a 190 thermostat is fully open at 208. Cummins the fan must be off at 194 degrees.

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post #7 of 15 (permalink) Old 02-06-2011, 07:17 AM Thread Starter
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John how come the temp reaches 190 as soon as the sun goes down or when overcast or raining, this got me puzzle since the day it started.
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post #8 of 15 (permalink) Old 02-06-2011, 02:56 PM
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Does the temp change have anything to do with turning lights or any other acc. on? in which case I would check the ground(s) on the cab and guage panel. I would also say that 180 is a little on the cool side for an ATTAC engine.

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post #9 of 15 (permalink) Old 02-06-2011, 03:01 PM
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I was going to say the same thing. My H20 temp climbs a bit when I turn my headlights on. I've been hunting down a ground issue for ever but so far I've failed
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post #10 of 15 (permalink) Old 02-06-2011, 05:20 PM
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I would recomend a good mechanical gauge. Get rid of the electric one, i really think they are not really accurate.
There is no reason for your guage to read 10* higher at night, other then a ground issue.
The mechanical is a little harder to install, but well worth it for accuracy.
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