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trickster5000



Member Since: 12 Dec 2015
Location: East Yorkshire
Posts: 502
United Kingdom 1989 Defender 90 300 Tdi CSW Arles Blue
300tdi Black smoke - possible causes?
I replaced the head gasket on my 300tdi and now there is a lot of black smoke from the exhaust particularly at high revs under load. So far I have used a compressor to pressurize the pipes from the turbo through the intercooler and back to the inlet manifold - no leaks/hissing.

I understand that black smoke is caused either by excess fuel or a lack of oxygen, therefore is the next suspect the injectors? I removed and replaced them multiple times during the gasket replacement as I had sealing issues (now fixed) however they were not dropped or knocked at all so I don't think they are damaged.

Unfortunately I didn't specifically watch the exhaust prior to the head gasket replacement and so I don't know if the issue was caused by something that changed then or if it had been smoking for a while.

Any help/suggestions are very much appreciated. Thumbs Up Matt.

'89 90 CSW with a 3.5 V8 conversion (WIP) - http://www.defender2.net/forum/topic46809.html
Post #546345 5th Jul 2016 8:03pm
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VeeTee



Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512
Netherlands 
Wear or misalignment of the timing belt can cause smoke. I had had this experience after serious greenlaning and wading and forgot to plug the timing housing, wich caused serious wear of the timing belt. Embarassed Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

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Post #546347 5th Jul 2016 8:14pm
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Mash



Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674
Guernsey 1998 Defender 90 300 Tdi HT Nato Green
Have you checked for excessive wear in the turbo? Bearing failure can cause excessive movement in the turbine/compressor blades this at high revs then fails to supply the correct boost pressure. 90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............
Post #546356 5th Jul 2016 8:33pm
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steventheplumber



Member Since: 29 Apr 2014
Location: Lincolnshire
Posts: 767
England 1987 Defender 90 200 Tdi HT Keswick Green
I found my turbo was loose on its connection with the exhaust manifold. That seems to make it smoke some!
Post #546451 6th Jul 2016 6:58am
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