What is the cold engine 'crackle'?

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SteveClv

Active Member
Posts
145
Location
Sherborne, Dorset
I'm not really up on the older diesel engines such as my TD5 Disco 2 - have had Merc diesels etc which are much more refined but I do like my TD5....however... in the morning, when the engine is cold, as soon as you tickle the throttle it sounds like what I can only describe as a crackle.
On a petrol engine I might have through it was timing chain or maybe piston slap - but does anyone else hear this on a cold engine and maybe know what it is?
I'll try and record it if it's not obvious.
When the engine warms up I don't really hear it - just for the first 2-3 minutes of running, when pulling out of junctions etc.
 
Diesel knock, you don't hear it in more refined cars because of the superior sound proofing.
Nowt to worry about IMHO.
 
I'm not really up on the older diesel engines such as my TD5 Disco 2 - have had Merc diesels etc which are much more refined but I do like my TD5....however... in the morning, when the engine is cold, as soon as you tickle the throttle it sounds like what I can only describe as a crackle.
On a petrol engine I might have through it was timing chain or maybe piston slap - but does anyone else hear this on a cold engine and maybe know what it is?
I'll try and record it if it's not obvious.
When the engine warms up I don't really hear it - just for the first 2-3 minutes of running, when pulling out of junctions etc.

diesel knock but with out having the injectors tested ( a dosage test .balance check ) we are just guessing.. this rattle there are many other things that come into play like air fuel ratio ....not just the injectors change tolerances from a 3 minute of running but also other vital moving parts of the engine .

if you don't have access to a diagnostic tool do some research of adding in 2 stroke oil to the fuel it might help
 
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