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adseybear



Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 266
Canada 
Td5 diesel knock when engine hot
Noticed now that diesel knock seems more and more pronounced when engine is fully up to temp.

Injectors?

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1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
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Post #1059222 2nd Feb 2025 12:19am
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 999
Canada 2000 Defender 110 Td5 XS CSW Epsom Green
What oil is in it? And is there enough? Injectors just click…

So knocking is bad! Could be many things. Check head gasket, timing chain, rockers… 🤷‍♂️

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Post #1059305 2nd Feb 2025 6:56pm
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Hazza



Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 244
United Kingdom 1990 Defender 110 Td5 HT Bronze Green
Does it change with clutch in/out? Could maybe be Dual Mass Flywheel? 1990 Defender 110 200TDI Camper - now converted to Td5 power
Post #1059347 3rd Feb 2025 8:30am
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adseybear



Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 266
Canada 
Nope, it’s definite combustion diesel knock, not oil or anything related. Only on idle does it get loud and when engine is up to temp. All other driving scenarios it’s fine. 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
2019 Jeep Wrangler JL Rubicon - SOLD
2006 Volvo V70 D5 - Ocean Race Edition, SOLD
2003 VW Passat Estate 1.9TDI - SOLD
2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD
Post #1059398 3rd Feb 2025 4:36pm
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DefenderCan



Member Since: 25 Nov 2023
Location: Canada
Posts: 47
 2006 Defender 110 Td5 CSW Chawton White
I would bank on the injectors.... possibly the harness is giving incorrect signals.....

Here are some other possible things Ill spill off the cuff.....

big end or small end bearings but that's crazy work to find out

timing chain and tensioner can make a knock.
Your crank pulley could be delaminating this will also make a knock.

If you have a nanocom you can check your cylinder balances.....

In an extreme situation but unlikely, one of your injectors are leaking, pooled the bowl and on first combustion bent a rod.... again, very very rare but possible.
Post #1075843 21st Sep 2025 10:39am
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