2.5 N/A Diesel Running Hot - Defender Source
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Old February 8th, 2016, 11:45 AM
1985 110
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defender 110
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2.5 N/A Diesel Running Hot

I have a new to me 1985 Defender 110 with a transplanted 2.5 NA Diesel.
It ran with the temp gauge locked in the middle for several weeks.

Then the Temp Gauge started to go into the red - then would return to the middle for a while.

I replaced the thermostat (with one from rovers north) and - again the temp stayed in the middle of the gauge - for several weeks.

Now the temp is starting to go into the red again.

There is no sign of anti-freeze in the oil and it seems to run well.

Any thoughts? Bad thermostats? Something else?

Also how tolerant is this engine to heat?


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Old February 8th, 2016, 11:54 AM
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John B.
1991 Defender 90, 200TDI
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Location: Calgary
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Maybe the gauge is broken... Any signs it is really getting hot?

First thing I would check is the cooling fan viscous unit. They have a high failure rate. When you have gotten too hot, it should be locked up. Carefully try and slow it down with a rolled up newspaper. If it is working, you won't be able to slow it down.
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Old February 8th, 2016, 12:02 PM
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Robert Davis
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Location: USA
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Get yourself a infrared temp gun and verify the gauge is accurate.

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