Normal operating coolant/oil temps for 300tdi? - Defender Source
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  #1  
Old September 24th, 2017, 07:43 PM
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Eric Wages
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Normal operating coolant/oil temps for 300tdi?

Hi all,

Took my project for the first spin around the block in 2.5 years. This was the first time it's ever been driven with the new powerplant besides being loaded on/off the trailer for paint.

Observations:

Coolant temps seem to operate around 185F when cruising 30-40mph. Oil temperatures were ~20F higher. Is that normal?

I've searched, searched, and searched and can't find what's "normal" for the 300tdi. I'm using the top of the thermostat housing for the coolant measurement point, and an oil sandwich filter for the oil temp/pressure measurement point.

Thanks for your input!
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  #2  
Old September 24th, 2017, 08:54 PM
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I have a 200tdi, but I figure the two engines aren't that much different.

Coolant temp sounds correct. Despite having way too many gauges on my truck, I do not have an oil temp gauge.

Do you have an oil pressure gauge? It should be around 60psi cold and about 18psi hot on 15W40.
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Old September 24th, 2017, 09:13 PM
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Eric Wages
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Oil pressure looked normal. (It's part of the Madman gauge package). Was high of 45psi after warming up and maybe 20 at idle?
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Old September 26th, 2017, 06:20 PM
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Eric Wages
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Bump for more feedback. Does anyone else have a working (digital) oil temp gauge on their 300tdi setup?
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Old September 26th, 2017, 06:43 PM
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John B.
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Temperatures are normal. I hope the coolant gauge is before and not after the thermostat.
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Old September 26th, 2017, 06:48 PM
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Quote:
Originally Posted by Red90 View Post
Temperatures are normal. I hope the coolant gauge is before and not after the thermostat.
Coolant gauge is reading from a plug that replaces the fill plug on top of the housing, eg:



Oil temp being measured off of a sandwich plate mounted to the OEM oil filter location.
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Old September 26th, 2017, 07:28 PM
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That location is fine.
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Old September 26th, 2017, 09:08 PM
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Quote:
Originally Posted by Red90 View Post
That location is fine.
Any thoughts on the sandwich filter/oil temps?
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Old September 26th, 2017, 10:07 PM
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It should be fine. Just make sure it does not interfere with the oil cooler flow. It is such a pain that they removed the oil temperature sender port on the 300TDIs.
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