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Littlewill
Member Since: 14 Sep 2015
Location: Lincolnshire
Posts: 484
  
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| Discovery 3 Glow Plug Solution..? |
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Ok so I've been talking to a mechanic friend of mine who has just told me that he seems to remember a Discovery 3 coming in wanting new glow plugs fitting and as a precaution to prevent snapping they removed all the injectors and through the injector hole, using flexable pipe sprayed each glow plug with a de-coking agent and a lubricant... he reports that all plugs came out whole....
My question is although I know and trust this friend what is the likely hood of this actually working? after all the injector and the glow plug are very close in the cylinder
Your thoughts?
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 23rd Dec 2017 6:37 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
 
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Others have used a fuel additive to decoke them.
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| 23rd Dec 2017 7:43 pm |
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ThamesD3
Member Since: 10 Oct 2016
Location: Penamacor, Portugal
Posts: 42
 
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I am a bit doubtful. The glow plug tips do get coated with a layer of hard carbon deposits. If the de- coking agent can clear that it would reduce the chance of a tip breaking.
The other problem is soot around the main shaft of the glow plug that makes them tight to remove and then the hex section breaks off. D1 300TDI ES. just kept going, sold at 170k miles, body beginning to rust
D2 TD5 GS. sold at 140k, chassis beginning to rust
D3 TDV6 SE. 194k Still going.
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| 23rd Dec 2017 9:52 pm |
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SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
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I have had some vehicles in where all six plugs would come out without a fight, easily.
I have had other vehicles of similar age and mileage where all six were seized.
If there is no movement, then a releasing agent or decoking agent will only have effect on the parts it can reach. As such a small area is in the cylinder how would the fluid not only reach it, but penetrate up past a solid, seized tip. Yes some of it would soften a small area by wicking upward. But how would it hit the right spot in a big cylinder where you are squirting it downwards and the glow plug tip is on the top face?
Once there is movement, however small, is when fluid can help.
The whole thing is time consuming and patience is the game to play.
A company called Pichler make a very well engineered tool for removal. (It should be at £1000!) You can then machine off the top, tap a thread internally and use a puller to crack them off the seats. As soon as this gets movement, then tapping it back in, then pulling out again, repeating each time with fluid, usually means they can be removed.
But I would not even start the job if the owner isn’t committed to removing the heads if the worst case scenario was to happen.
Regards Steve
Last edited by SteveNorman on 24th Dec 2017 1:13 pm. Edited 1 time in total
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| 24th Dec 2017 9:52 am |
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Felstmiester
Member Since: 12 Dec 2016
Location: Hertfordshire
Posts: 211
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There must be a few companies out there these days that have ways to remove them. Having owned numerous vivaro, trafic, primastar vans where the injectors corrode in the head and are near impossible to remove by diy. There people out there that have ways to remove them reasonably easy. It’s a well known problem with these vans and there was obviously a niche in the market. I’m so surprised there’s not more that have came up with ways to remove the d3 glow plugs.
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| 24th Dec 2017 7:52 pm |
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ds23man
Member Since: 19 Jan 2013
Location: Ainum
Posts: 227
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Well, most TDV6 engines blow up well before the glowplugs need replacing due to broken crankshafts and oilpumps. 
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| 24th Dec 2017 7:55 pm |
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SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
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Pichler is the company that also makes the injector removal tools for the vivavro etc..... those are £3k!
There are people that just carry out the removals and nothing else.
But, as with everything there is a chance that all will not go well, so no one will offer a guarantee that no problems will arise.
And you have to expect, due to the time involved and the cost of the tools, that a reasonable price is charged.
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| 24th Dec 2017 8:47 pm |
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Littlewill
Member Since: 14 Sep 2015
Location: Lincolnshire
Posts: 484
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Any news on your extractor kit Disco_Mikey?
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| 29th Jan 2018 9:12 pm |
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