smoking 1992 300SD

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CarGuru > Mercedes > smoking 1992 300SD 3 May 2005 08:36:04

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smoking 1992 300SD
art henriksen via CarKB.com 1 May 2005 23:15:52
	My '92 300SD with 243,391 miles on it smokes escessively and uses LOTS of oil. After shutdown and sitting for awhile it belches alot of smoke on startup. I suspect valve guides/seals are worn enough to allow oil to enter cylinders and cause excessive smoke at startup. Woud a rebuild head solve problem or are wornrings also a probability? Would appreciate any comments.
		Add comment


Pool Man 1 May 2005 23:28:46 [ permanent link ]
	valve guides and seals the case, minus a few cans!
		Add comment


T.G. Lambach 1 May 2005 23:45:24 [ permanent link ]
	It's much worse than you think. The 3.5L diesel has a well known reputation for bending its connecting rods, more often than not those of #1 and #4 cylinders. The bent rod allows its piston to score the cylinder wall with the result being the problems that you describe. Many engines were replaced on this account. Some died young - at say 65K miles and others ran a long, long time, yours appears to be one of those so in a sense you "lucked out" since many diesels need an overhaul starting at about 250K miles. Replacement connecting rods have been modified from the too weak original ones, I suggest you have a chat with the local M-B parts man as to their availability. This won't be cheap to repair.
		Add comment


Martin Joseph 2 May 2005 00:47:24 [ permanent link ]
	On 2005-05-01 12:15:52 -0700, "art henriksen via CarKB.com" <forum@nospam.CarKB.com> said: My '92 300SD with 243,391 miles on it smokes escessively and uses LOTS of> oil. After shutdown and sitting for awhile it belches alot of smoke on> startup. I suspect valve guides/seals are worn enough to allow oil to> enter cylinders and cause excessive smoke at startup. Woud a rebuild head> solve problem or are wornrings also a probability? Would appreciate any> comments. Doing a proper compression test including a wet leak down test will tell you if the leak is the rings or the cylinder head... This should be done before you take anything apart (obviously?). If the wet leak down shows that it's the pistons, then TGs scenario is most likely. If it shows it's the head then pool man is probably right... Good luck, Marty
		Add comment


Tiger 2 May 2005 03:53:48 [ permanent link ]
	I agree.
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Chas Hurst 2 May 2005 03:56:05 [ permanent link ]
	"Martin Joseph" <mercedes@barknaturalpet.com> wrote in message news:200505011347248930%mercedes@barknaturalpetcom...> On 2005-05-01 12:15:52 -0700, "art henriksen via CarKB.com"> <forum@nospam.CarKB.com> said:> My '92 300SD with 243,391 miles on it smokes escessively and uses LOTS oil. After shutdown and sitting for awhile it belches alot of smoke on> > startup. I suspect valve guides/seals are worn enough to allow oil to> > enter cylinders and cause excessive smoke at startup. Woud a rebuild head> > solve problem or are wornrings also a probability? Would appreciate any> > comments.> Doing a proper compression test including a wet leak down test will> tell you if the leak is the rings or the cylinder head... This should> be done before you take anything apart (obviously?).> If the wet leak down shows that it's the pistons, then TGs scenario is> most likely. If it shows it's the head then pool man is probably> right...> Good luck,> Marty A compression test is normally done in cases of reduced performance. In this instance, oil consumption, it will be useless.
		Add comment


Martin Joseph 2 May 2005 09:31:28 [ permanent link ]
	On 2005-05-01 16:56:05 -0700, "Chas Hurst" <hurst1@comcast.not> said: "Martin Joseph" <mercedes@barknaturalpet.com> wrote in message> news:200505011347248930%mercedes@barknaturalpetcom...>> On 2005-05-01 12:15:52 -0700, "art henriksen via CarKB.com">> <forum@nospam.CarKB.com> said:>> My '92 300SD with 243,391 miles on it smokes escessively and uses LOTS> of>>> oil. After shutdown and sitting for awhile it belches alot of smoke on>>> startup. I suspect valve guides/seals are worn enough to allow oil to>>> enter cylinders and cause excessive smoke at startup. Woud a rebuild> head>>> solve problem or are wornrings also a probability? Would appreciate any>>> comments.>> Doing a proper compression test including a wet leak down test will>> tell you if the leak is the rings or the cylinder head... This should>> be done before you take anything apart (obviously?).>> If the wet leak down shows that it's the pistons, then TGs scenario is>> most likely. If it shows it's the head then pool man is probably>> right...>> Good luck,>> Marty> A compression test is normally done in cases of reduced performance. In this> instance, oil consumption, it will be useless. Wrong.
		Add comment


Pool Man 2 May 2005 15:49:42 [ permanent link ]
	very wronge!!!!!!!!! the case, minus a few cans!
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Chas Hurst 2 May 2005 23:37:11 [ permanent link ]
	"Martin Joseph" <mercedes@barknaturalpet.com> wrote in message news:2005050122312816807%mercedes@barknaturalpetcom...> On 2005-05-01 16:56:05 -0700, "Chas Hurst" <hurst1@comcast.not> said:> "Martin Joseph" <mercedes@barknaturalpet.com> wrote in message> > news:200505011347248930%mercedes@barknaturalpetcom...> >> On 2005-05-01 12:15:52 -0700, "art henriksen via CarKB.com"> >> <forum@nospam.CarKB.com> said:> >> My '92 300SD with 243,391 miles on it smokes escessively and uses LOTS> > of> >>> oil. After shutdown and sitting for awhile it belches alot of smoke startup. I suspect valve guides/seals are worn enough to allow oil to> >>> enter cylinders and cause excessive smoke at startup. Woud a rebuild> > head> >>> solve problem or are wornrings also a probability? Would appreciate comments.> >> Doing a proper compression test including a wet leak down test will> >> tell you if the leak is the rings or the cylinder head... This should> >> be done before you take anything apart (obviously?).> >> If the wet leak down shows that it's the pistons, then TGs scenario is> >> most likely. If it shows it's the head then pool man is probably> >> right...> >> Good luck,> >> Marty> > A compression test is normally done in cases of reduced performance. In this> > instance, oil consumption, it will be useless.> Wrong. Not so. How will a compression test reveal worn valve guides or bad stem seals? And oil control rings have little to do with compression. Finally, the engine's using oil, so it's already wet for your dry/wet test.
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Tiger 2 May 2005 23:52:47 [ permanent link ]
	Poor compression will indicate whether there is a leak or not... poor compression means a leak which then leads to leakdown test... and listening for air hissing via the intake manifold or via oil cap. Basic diagnostic of engine internals are compression test... and then leakdown test.
		Add comment


Martin Joseph 3 May 2005 07:22:04 [ permanent link ]
	On 2005-05-02 12:37:11 -0700, "Chas Hurst" <hurst1@comcast.not> said: "Martin Joseph" <mercedes@barknaturalpet.com> wrote in message> news:2005050122312816807%mercedes@barknaturalpetcom...>> On 2005-05-01 16:56:05 -0700, "Chas Hurst" <hurst1@comcast.not> said:>> "Martin Joseph" <mercedes@barknaturalpet.com> wrote in message>>> news:200505011347248930%mercedes@barknaturalpetcom...>>>> On 2005-05-01 12:15:52 -0700, "art henriksen via CarKB.com">>>> <forum@nospam.CarKB.com> said:>>>> My '92 300SD with 243,391 miles on it smokes escessively and uses LOTS>>> of>>>>> oil. After shutdown and sitting for awhile it belches alot of smoke> on>>>>> startup. I suspect valve guides/seals are worn enough to allow oil to>>>>> enter cylinders and cause excessive smoke at startup. Woud a rebuild>>> head>>>>> solve problem or are wornrings also a probability? Would appreciate> any>>>>> comments.>>>> Doing a proper compression test including a wet leak down test will>>>> tell you if the leak is the rings or the cylinder head... This should>>>> be done before you take anything apart (obviously?).>>>> If the wet leak down shows that it's the pistons, then TGs scenario is>>>> most likely. If it shows it's the head then pool man is probably>>>> right...>>>> Good luck,>>>> Marty>>> A compression test is normally done in cases of reduced performance. In> this>>> instance, oil consumption, it will be useless.>> Wrong.> Not so. How will a compression test reveal worn valve guides or bad stem> seals? And oil control rings have little to do with compression. Finally,> the engine's using oil, so it's already wet for your dry/wet test. It won't reveal the stem seals or valve guide issue, that's true(because the valves are closed and seal), but it might help eliminate the scored piston/bent rod scenario which TG brought up. Doing a dry compression test / leakdown followed by a wet one will show if there is significant damage in the piston bore (or broken rings) in my experience. The amount of smoke the OP seemed to describe doesn't seem to be enough to create a automatic wet test. It is true that the leak down test MIGHT not prove useful, but it is potentially useful and an inexpensive diagnostic step that can provide critical information. Certainly worth trying IMO before deciding on a new/rebuilt engine or head work. I kind of tend to Poolman's valve seal/guide theory as a guess. Marty
		Add comment


Chas Hurst 3 May 2005 08:36:04 [ permanent link ]
	"Martin Joseph" <mercedes@barknaturalpet.com> wrote in message news:2005050220220416807%mercedes@barknaturalpetcom...> I kind of tend to Poolman's valve seal/guide theory as a guess.> Marty Given the high milage on the car I would agree. Digging down to the stem seals is not a large job, once there the condition of the valve guides can also be assessed.
		Add comment

CarGuru > Mercedes > smoking 1992 300SD 3 May 2005 08:36:04

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smoking 1992 300SD

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