RE: 1979 Mercedes Engine Dies - What could be the problem?
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 9:20:55 AM
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sfk
Posts: 58
Joined: 2/7/2007
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Thanks, I did put brand new bosh injectors in and still the same thing... I also tried both fuel filters. Hmmm. I just ordered the compression check (to measure the compression on the cylinders). That is the only other thing I can figure it could be.
Only other thing is if it is the actual injector pump on the side of the engine. Does this ever go bad? What is the sypmtoms when the pump goes bad. I know they contain little pistons that pressurize the fuel to like 4,000 psi. Is there any way to test the pump?
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 10:11:23 AM
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Charles Munn
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As I understand it, the injector pump rarely conks out, but it's mechanical so of course it does occasionally belly up. You might try loosening the fuel injector lines at the top of the fuel injectors and have someone crank the engine while you check for a healthy fuel flow. But I don't know how to check for the needed pressure... For all I know, even though you're getting what seems to be enough fuel from your tank and through your fuel filter, it may not be enough to feed the engine. There still may not be enough fuel pressure there to the IP to keep the engine running and, even though it gravity flows, it could still be partially blocked. The only true way to test that is by switching those incoming and outgoing fuel lines as I discribed in the first post. If you haven't done that, then, IMHO, you haven't yet eliminated that problem...
Theres a couple of very smart mechanics on this forum, such as forcedinduction, who might know how to test the IP. If not, there's a dozen or more of really smart MB diesel mechanics at http://www.schumanautomotive.com That's where I go when I really need help. Henry Schuman, who has been a MB diesel mechanic for decades, will even get you the best prices on new and used MB parts. Or others there may be willing to trade parts, etc.... In my book, some of those guys are genuis'es at tinkering....
< Message edited by Charles Munn -- 2/13/2007 10:24:00 AM >
_____________________________
1982 300D T, 322,000miles
1991 Lexus LS400 212,000 miles
1986 GMC, HD, "J", 429,000 Km
All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.
Arthur Schopenha
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 10:20:26 AM
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sfk
Posts: 58
Joined: 2/7/2007
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Charles,
Thanks for the tips. I will try that again. I had replaced the fuel filters but will try that again. What is still is wierd is this
Why would you get diesel spray/mist coming out of the exaust pipe, when I KNOW the glow plugs are working.
ALSO, the engine isn't cranking as easy as it use to. I had put a new battery in it and same thing. It is like something is restricting the engine down. Hopefully the compression check shows everything ok. I am afraid of a blown head gasket. I don't know what else it could be.
Do you know if air enters the Injector pump. If so, is there a flap or something that would stop the air from mixing with the fuel. I think the fuel just gets sprayed into the injector with no air. Just not sure what the vacuum hoses are going to on top of the injector. Do you know.
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 10:27:27 AM
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Charles Munn
Posts: 244
Joined: 8/19/2006
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Maybe a broken or burnt piston? But probably not. It seems to me that it's usually something simple... Believe me, if those guys at schumanautomotive can't come up with some answers, no one can....
_____________________________
1982 300D T, 322,000miles
1991 Lexus LS400 212,000 miles
1986 GMC, HD, "J", 429,000 Km
All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.
Arthur Schopenha
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 10:40:13 AM
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Charles Munn
Posts: 244
Joined: 8/19/2006
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BTW, did you also replace the heat shields when you replaced the injectors? And were they put in with the right side up? Is it leaking fuel at the base of the injectors? Also, since you smelled raw diesel at the tail pipe it sounds like it's not firing... so I can see why you ordered the compression set....I don't remember if you tested the glow plugs....But since the engine is hard to crank... it's probably not a broken piston top....Maybe it still could be a burn't piston.... dieselgiant.com has a picture of a burnt piston in an old MB engine here: http://www.dieselgiant.com/mercedes617engineinternals.htm
< Message edited by Charles Munn -- 2/13/2007 10:55:29 AM >
_____________________________
1982 300D T, 322,000miles
1991 Lexus LS400 212,000 miles
1986 GMC, HD, "J", 429,000 Km
All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.
Arthur Schopenha
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 10:47:56 AM
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AMGMercedes
Posts: 1515
Joined: 1/31/2006
From: Maryland
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quote:
diesel fumes coming out of the exhaust pipe
Unburnt fuel may be the effect of a burnt piston. Still leaning towards bad glow plugs as well. When was the last time those have been changed?
_____________________________
1984 Mercedes 190D-SOLD!
1999 Honda Civic DX- Current DD
1986 Mercedes 190E-16v-On the way
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/13/2007 11:20:17 AM
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Charles Munn
Posts: 244
Joined: 8/19/2006
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quote:
ORIGINAL: sfk
ALSO, the engine isn't cranking as easy as it use to. I had put a new battery in it and same thing. It is like something is restricting the engine down.
A common problem is a corroded ground connection on the starter... In fact you need to go through all of the ground connections, from the battery to the relays, to the starter....
quote:
Do you know if air enters the Injector pump. If so, is there a flap or something that would stop the air from mixing with the fuel. I think the fuel just gets sprayed into the injector with no air. Just not sure what the vacuum hoses are going to on top of the injector. Do you know.
I can't see how those lines have anything to do with your problem/problems...That's for the vacuum engine cutoff. dieselgiant.com has a pictorial about that.... it's great... shows how to remove all vacuum lines, and brake line around the ALDA and then remove the ALDA so you can look into the pump in order to see how to connect the vacuum engine cutoff switch...
< Message edited by Charles Munn -- 2/13/2007 11:24:06 AM >
_____________________________
1982 300D T, 322,000miles
1991 Lexus LS400 212,000 miles
1986 GMC, HD, "J", 429,000 Km
All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.
Arthur Schopenha
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