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rsms



Member Since: 12 Jan 2013
Location: Home
Posts: 38
Slovenia 
Overheating sound?
Hello,

I recently noticed that my Defender (TD5 2002) has developed a new sound. When I switch off the engine after I have finished driving, there is a sound from the engine compartment that is similar to the crackling sound when some heated thing is shrinking. The sound repeats a few times (3-5 times in a few minutes) and then stops.
This happens after normal driving (e.g. 15 minutes of normal driving). So far, the Defender has always been silent after the end of the drive...

Something seems to be overheating. The water temperature is fine, I also have an additional temperature sensor mounted on the screw of the temperature switch housing, and it shows normal values.

Has anyone had a similar experience?
Post #1070039 20th Jun 2025 7:47am
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1276
France 2002 Defender 110 Td5 DCPU Chawton White
15min of Td5 action barely gets mine to operating temperature..

I would start with confirming of your engine is in any way overheating. Get a cheap infrared thermometer and start taking some readings.

It could be what you hear is the exhaust where maybe a stud has come loose (broken) which is pretty common and can be a pain to correct. If so I recommend you get the exhaust manifold skimmed (milled flat), they tend to warp/bend
Post #1070042 20th Jun 2025 9:46am
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o4dn



Member Since: 08 Jan 2010
Location: South West
Posts: 588
France 2009 Defender 90 Puma 2.4 SW Alaska White
The centrifugal oil filter on the TD5 sometimes makes a noise (spinning down) when switching the engine off.

Maybe that's what you hear? “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
--
2009 2.4 Puma Defender 90 SW
1979 Land Rover Series 3 88"
Post #1070046 20th Jun 2025 11:14am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17823
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It could be a warped exhaust manifold moving, especially if one or more stud has failed.
Post #1070061 20th Jun 2025 2:56pm
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rsms



Member Since: 12 Jan 2013
Location: Home
Posts: 38
Slovenia 
Very good tips! Will check "heat print" with IR thermometer and if all the manifold studs are there and not loose.

The centrifugal filter spinning-down sound can also be heard but the new sound is different. Today I listened to the running engine sound again (bonnet-up) and the strange new noise can also be heard now and then when engine is running - time to do some homework.

Thank you - will reply back with findings.
Post #1070109 21st Jun 2025 1:50pm
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