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Are there any XUD or general diesel experts out there??
I bought a Talbot Express a week ago and immediately had to change the XUD Turbo engine due to it being fractured where the oil cooler bolts to the block.
The replacement engine came from a 1998 306 D Turbo with one of those immobilised Lucas pumps.
So, I swapped the Lucas pump for the existing Bosch pump along with the injectors and new injector seals.
Prior to the swap, the original engine would only start from cold with full throttle and had quite a bit of white smoke. Fine when warm.
The problem I have is that new engine smokes (white) really badly from cold, again it will only start on full throttle, it could even be misfiring but its hard to tell.
I've adjusted the timing such that its advanced as far as possible without knocking. When warm (after being driven), theres no smoke and it runs brilliantly. Plenty of power and as smooth as any XUD I've ever driven.
Today has been the first proper run with the new engine. I've done 75 miles with a load of new diesel and a can of Comma injector cleaner in it and given it a right good thrashing but the problem persists after the engine has cooled.
Could the injectors be past their best at approx. 81k?
Any help much appreciated.
Cheers, Ian
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Vauxhall Omega V6 Estate
Landrover Defender 300Tdi
Ford Puma (winter smoker)
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white smoke is unburnt fuel - so it either needs advancing even more, or you've got dodgy injectors. Simple test first, advance the pump until it simply doesn't start any more, to see if the smoke stops
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You're like a crazy backyard genius!
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Sounds like my 405 but 10x worse. That has poor starting because there is an air leak in the filter housing. Does the problem persist if started immediately after pumping the priming bulb until it goes hard?
James
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Advancing the timing any more leads to knocking so I can only think the injectors are dodgy.
Can anybody recommend somewhere to get injectors refurbished?
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Vauxhall Omega V6 Estate
Landrover Defender 300Tdi
Ford Puma (winter smoker)
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guessing you mean knocking at low revs? Does the knocking become less noticeable at higher revs?
If so, does your pump have an advance lever? Or is it electronically actuated? As if this isn't working, it'll be incredibly hard to start
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You're like a crazy backyard genius!
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Its got a thermostatically controlled actuator for cold starting. This is working.
When I adjust the pump position, its at idle. If I move the pump top towards the block it advances the timing and any further causes knock at idle. I've not tried to rev it from a knocking state. Should I?
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Vauxhall Omega V6 Estate
Landrover Defender 300Tdi
Ford Puma (winter smoker)
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if it's too advanced, and the timing is "stuck" it usually runs smoother at higher rpms (as this is when you'd need it advanced)
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You're like a crazy backyard genius!
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Are you certain the cold start stuff is working? It it runs fine when warm then I doubt its the injectors, mine have done almost 220,000 and still runs very smoothly and returns 40MPG around town
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It will come in handy even if you never use it
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I've had the injectors checked today and been told they're fine.
The cold start actuator is definitely working. When moved by hand the engine revs rise.
The diesel specialist I took them to also recommended checking the cold start actuator is moving far enough. I'll collect the injectors tomorrow and try adjusting this. He is convinced its timing related.
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Vauxhall Omega V6 Estate
Landrover Defender 300Tdi
Ford Puma (winter smoker)
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tdipd
Part of things
Posts: 121
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white smoke is unburnt fuel - so it either needs advancing even more, or you've got dodgy injectors. Simple test first, advance the pump until it simply doesn't start any more, to see if the smoke stops Black smoke is unburnt fuel with a Diesel Have a look at this, it may be of help gguymotors.co.nz/faqs/diesel-smoke-wof-failure/I used to play with XUD's alot in my 306 days, You are advancing and retarding the injection timing, I'm not sure this would be your issue, as it would have the same issue both hot and cold in this case. (Although a slight tweak on the timing made them a little more peppy) Firstly, are you certain your glowplugs and glowplug relay are good? If you need to test the plugs, the best way is to take them out and test each individually... attach negative lead direct from battery to body of the plug, and positive lead to the top. They should be glowing at maximum heat in 10seconds To test relay, check that voltage is reaching the glowplugs when the ignition is turned on. ps. that glowplug at cylinder 1 is a real curse word to get to behind the bosch pump! I think you should make certain your heating system is correct before changing injectors etc. If you are after injectors, id recommend throwing in some cheap second hand units to diagnose the problem before refurbing your own. check out pug306.net and go to the diesel section for more help. You can also tune that pump to make your talbot alot faster!
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white is unburnt (acrid smell, and stings the eyes) black is incomplete combustion, caused by an over-rich mixture
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You're like a crazy backyard genius!
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tdipd
Part of things
Posts: 121
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white is unburnt (acrid smell, and stings the eyes) black is incomplete combustion, caused by an over-rich mixture "I see", said the blind man ... As said, could also be leaking air into the fuel filter housing... had this problem before too, I think it was the seal on the lid of the filter housing that comes with new filter (I went through 4 xud9te engines in 1 car! I was running 26psi boost and heavily tweaked pump though... worst one was when it dropped a pre-combustion chamber into the cylinder. Still ran, but like a knackered tractor!)
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I recall the plastic fuel filter housings having issues with air leaks... so might be worth bypassing with an inline fuel filter to see if it improves?
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You're like a crazy backyard genius!
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THE_Liam
Yorkshire and The Humber
If at first you don't succeed... HAMMERS.
Posts: 1,363
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Post your question on 306oc.co.uk, lots of diesel knowledge on there and people will probably be interested in your car too.
My 2p, really does sound like air ingress to me.
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Well it all appears to be resolved now.
The injectors checked out fine so only paid a nominal test fee. Worth bearing in mind Borowash Diesel Services if you're in Derbyshire. Damn good chaps and seemingly very honest.
I rebuilt the injection system and advanced the timing a lot. Fired straight up without the need for full throttle and no smoke. Plenty of knocking though so backed it off just a touch, still no smoke but nice and 'smooth'. Just done 50 miles in it and all seems well.
Hopefully when I come to start it tomorrow it'll be just as good.
Thanks for all the advice.
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Vauxhall Omega V6 Estate
Landrover Defender 300Tdi
Ford Puma (winter smoker)
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May 15, 2015 13:59:55 GMT
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My input would be that for the effort it takes on a ve pump it's worth checking the injection timing with a dial gauge rather than by ear so then you're absolutely sure its right. Even if you do decide to tweak away from the factory setting you have a measure of what it's set to so you can repeat anytime the cam belt comes off. Sounds to me like the issue all along was not enough advance in the timing which normally cause unburned fuel white smoke. Glad you've got it fixed Rich
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