Rich84
Member Since: 25 Jun 2013
Location: South Australia
Posts: 238
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I suggest that first you ascertain basic mechanical integrity, ie, timing correct, timing correct on both cams for the LH bank, HPFP belt intact, good compression, then you can start looking at why the fuel system is not working properly. If the injectors are firing then the only thing I can think is that there is some obstruction in the air supply system or the injector timing is wrong as has been suggested before. The timing is controlled electronically so the first place I'd be checking is the output of the cam/crankshaft position sensors for accuracy.
I'd also use a mechanical compression gauge to rule out any issues there. The oscilliscope probably is a good indicative test but since diesels only need air, diesel, compression (and the timing to be correct!) you're going to have to start looking at each more closely. 2008 RRS TDV6 - Chawton White/Black/Lined Oak - 20's, h/k, sunroof - 350K KM.
2010 Audi A6 3.0T S-Line - Phamtom Black/exclusive 2-tone valcona 184K
2000 Audi A4 avant 1.8t Q Sport - Phantom Black/black 385K KM
1990 Nissan Pintara TRX - red - lots of mods - 439K KM
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 29th Jan 2017 9:46 pm |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
  
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Got sick of waiting for the mechanic to do anything with the D3 and towed it out of the garage monday night, had a look at it yesterday, pulled the P/S rocker cover and immediately found the issue, snapped cam chain!
it looks like there isnt any sign of the valves having hit the pistons and the cam position would indicate none of the valves are at a position that would cause interferance, so theres a slim possibility that theres no damage to the head, weighing up the options of just sticking a chain on it and seeing what happens or replacing the whole head with a second hand one i know is good, what do ye reckon??
Cheers,
Comhghan
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| 8th Feb 2017 8:59 am |
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hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
 
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Garage near me had one brought in, owner wanted rid so they had it cheap. They fitted new chain and it rocks on to this day 
They know they were very lucky.
Andi.
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| 8th Feb 2017 9:10 am |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
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Hmmmm,
It is tempting to try a chain and just see what happens, if i do that, i could have the disco going by the weekend quite easily! but the downside is, if i chance it, and still have to replace the head, ive  away 170€ 
the facts are, the lobes look to be in the right position to cause no interferance, and theres no sign of valves having touched the cylinder.... hmmmm to chance it or not...
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| 8th Feb 2017 9:21 am |
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Landy_andy
Member Since: 05 May 2013
Location: Hertfordshire
Posts: 676
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Couldn't you shove a chain on it then do a compression test?
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| 8th Feb 2017 9:21 am |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
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Yeah, to be honest, thats probably the right move i think
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| 8th Feb 2017 9:29 am |
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Erea
Member Since: 19 Mar 2012
Location: Munster
Posts: 1509
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Well it's good news that you have found the problem. I'm guessing that when the chain snapped the pistons just pushed the valves out of the way As there was no resistance. You will be very lucky if there is no damage. The only way you'll find out if there is damage is to replace the chain. Good luck
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| 8th Feb 2017 11:13 am |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
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Relieved to finally know what the issue is all right, and all things considered, it could be a much worse situation! Chain is now ordered and will be here friday all going well. so in the meantime ill pull off the cams and get the old chain out in prep for the weekend refit 
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| 8th Feb 2017 11:51 am |
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hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
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Hi Lockey,
Check the sprocket has not turned on the end of the cam, and one or more lobes have not rotated around the cam shaft
Presumably, you would have found broken followers by now??
Andi.
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| 8th Feb 2017 3:32 pm |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
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Got as far as discovering the root cause last night then gave up, so will know more once i start dismantling this eve
Is there a goo way of measuring if the lobes or sprocket have spun?
Cheers,
C
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| 8th Feb 2017 3:34 pm |
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hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
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Haven't a clue 
Compare with a known good one ? ( which you haven't got) 
Compare with cams on other bank ??
Andi.
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| 8th Feb 2017 3:48 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
 
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which cam ? which bank ?
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| 8th Feb 2017 6:03 pm |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
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Passenger side bank, inlet camshaft
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| 8th Feb 2017 6:07 pm |
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Lockey
Member Since: 13 Dec 2016
Location: Limerick
Posts: 111
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UPDATE:
Pulled the cam off and found two broken followers! so made a start at getting the head off and have a second hand one on the way to get skimmed and fitted next week.
anyone have a DIY thread on head removal with the body on??
Cheers,
C
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| 9th Feb 2017 9:28 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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When removing the left head, body on, you will find you need to cut away some of the rear belt cover, to allow access to the 2 rear bolts holding the cam down.
You can use a soldering iron to melt the area, and then once the cover is off, tidy it up.
The cover has 2 bolts which need removing. One is an awful long thread with poor access.
The cam and plastic cover can then be removed as one. 
Order some new glowplugs. Hammer them out from the reverse.
The head has 2 dowels. So lift it up first, and then move it towards the center of the engine.
A scaffold tube is handy to undo the head bolts
Last edited by Pete K on 9th Feb 2017 12:28 pm. Edited 2 times in total
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| 9th Feb 2017 12:19 pm |
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