Helping a friend out here so I hope someone can help me Do doesel engines have EGR valves? It seems from reading up that it's not a good idea to reuse exhaust gases in diesels as you get a reduction in power, but that doesn't seem to answer whether they do or not. Thoughts please!

Yes they do have egr valves

Mainly used to reduce Nox(nitrates of oxide) gases so dont disconnect.

Ta

T14086 said:

Mainly used to reduce Nox(nitrates of oxide) gases so dont disconnect.

Click to expand...

Correct

http://www.emissioncontrols.co.uk/page.php?domain_name=emissioncontrols.co.uk&viewpage=EGR Valves

Aren't they also used to control cylinder temperatures?
Anyway, i can vouch that they are a bastard to remove on JTDs, get a garage to do it

H2DaE said:

Aren't they also used to control cylinder temperatures?

Click to expand...

yes.

The egr valve controls nox by reducing cylinder temperature, no other reason. If the cylinder temperature is high then the nox is produced, so by reducing temperature the emissions can be cleaner, it is nothing to do with protecting turbo bearings or anything else, its just a way of reducing emissions.