Peugeot Citroen XUD EGR & turbo information

Just a quick video explaining some important facts about the EGR valve and control solenoids and what to be aware of if buying a used turbo for the XUD turbo-diesel engine. (1.9 and 2.1 engines as fitted to Citroen Xantia, XM, Peugeot 206, 306, 405, 406 and 605). The tips and facts could also be applied to any make of diesel/turbo-diesel that uses conventional mechanical fuel injection. Exhaust gas recirculation is fitted to reduce oxides of nitrogen but more importantly to lower exhaust gas temperatures thus reducing thermal load on the turbo unit. Generally turbos on diesel engines are less heat tolerant than those fitted to petrol engines. One of the side effects of deliberately blanking off or a stuck (in closed position) EGR valve is overheating of the turbo shaft seals which eventually cook which over time allows engine oil to be drawn in and burned along with the fuel. Another symptom is intercoolers contaminated with oil. A light misting is ok but heavy contamination indicates either oil is being forced into the induction system via worn compressor seals or the crankcase is being pressurised due to blocked breathers, malfunctioning PCV unit, or worn bores or rings, worn valve seats - in short a well worn engine.
The XU diesel is generally long lived - IF regularly serviced - but it is NOT 'bomb proof.' It doesn't tolerate lack of servicing or extended oil change intervals. These engines need 6,000 mile oil & filter changes using good quality oil.

Category:

Autos & Vehicles

Tags:

• XUD
• XU diesels
• Citroen Xantia
• Citroen XM
• Citroen Xsara
• Peugeot 206
• 306
• 405
• 406
• 605
• PSA group
• Injector pump
• EGR valve
• Intercooler
• Turbo
• Turbine
• Compressor
• Solenoid EGR control valves
• Worn engine

[del635]

Disagree completely with de-egr affecting turbo life, my xud never had one to begin with it was a retrofit on these engines to pass emission laws and caused more problems than it solved. Also @ liberator I revved mine 5500-6000rpm all the time and it loved it??

[TK42138]

@del635

Hi, I think this discussion is split down the middle. I've heard many anecdotal stories with the age old 'should I/shoudn't I remove the EGR' . I guess some engines seem to work better without them but others tend to suffer. My own Citroen XM 2.1 TD performed better with the EGR blocked off but my Xantia 1.9 TD didn't like it at all.

[Liberator975]

'The XU diesel is generally long lived - IF regularly serviced - but it is NOT 'bomb proof.' It doesn't tolerate lack of servicing or extended oil change intervals. These engines need 6,000 mile oil & filter changes using good quality oil.' - Biggest load of rubbish i've ever heard in my life. I have had the EGR disabled on my pug for 3 years and has never had an oil change or any filter change. if you rev them to 4500rpm all the time they will go bang, i've ran them for years!!

[TK42138]

@Liberator975

You're telling me your XU diesel engine has never had an oil & filter change in 3 years? I'm impressed. What oil you using? The advice in my video is based on data collated from many garages, owners and manufacturers and experience of carrying out engine failure investigations for customers, warranty brokers etc. Seen many an engine reduced to a smoking, dribbling wreck because of low to no oil or oil so old it had to be spooned out because it wouldn't flow. I guess you're lucky.

[Liberator975]

@TK42138 i just use standard 10w 40 mineral oil in it. my old one used to leak oil and the time it had more oil in is when the oil pressure light came on. out of all the engines i've worked on, the xu engine has to be the most bullet proof. i've drove one 10 miles down the m6 heaters blowing cold due to a radator leak. topped it back up and its been fine. i can understand them going bang if someone decided to mix synthetic and mineral oil. but apart from that i would put my life on these engines

[TK42138]

@Liberator975

I used to own a 1992 Peugeot 309 with normally aspirated XU diesel. Bought it with 136,000 Sold that at 200,000 and as far as I know it's still on the road.

[del635]

@del635

an inlet blocked by egr gunk would also increase egt.

[del635]

@TK42138

I'm surprised the xantia didnt like it removed because unlike modern engines they wernt built around the egr, the first ones didnt have an egr at all. I always used non egr manifolds on my xuds instead of blocking the valve or disconnecting the vacuum. I just cant see the egt argument after actually having a gauge in my car, standard fuel and boost creates nowhere near turbo threatening temps, a restriction in the exhaust (read cat) would increase egts at full pedal.

[TK42138]

@Liberator975

Hopefully your turbo will last longer than my one did.

[Liberator975]

@Liberator975 btw i am at 140000 and i've had it since 117000