1979 Mercedes Engine Dies - What could be the problem?
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1979 Mercedes Engine Dies - What could be the problem? - 2/8/2007 8:57:56 AM
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sfk
Posts: 58
Joined: 2/7/2007
Status: offline
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>1979 Mercedes 300 SD. The engine would idle rough and a little smokey (but good) and
>would run fine. During about a 1 hour period, while driving on the highway the car hesitated a few
>times (semi dying) but then would go right back to running fine. It
>then really started to "bog" down untill it finally stalled.
>
>I tried starting a couple of times, semi turns over but then dies as
>quickly as it starts. It also FEELS like the engine is having difficulty turn over. (new battery but turns slower as if there is a load on the engine).
>
>Any ideas?
>
>I just tried replacing the fuel injectors with no luck.
>
>I do notice when I try starting it, I get that diesel fume coming from the muffler (there is a hole in the muffler by the muffler header). I have verified all glow plugs are working (I took them all out, hooked them up ALL up and grounded them and watch them all glow at the same time).
Does anyone have any ideas?
Is it possible that the Valves break?
(I ask cause almost as if oil is coming out from the lid on the oil filter like maybe the engine is getting unercompression.... just not sure).
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/8/2007 9:04:49 AM
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AMGMercedes
Posts: 1550
Joined: 1/31/2006
From: Maryland
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quote:
would idle rough and a little smokey
You need a diesel purge if you're idling rough. Check the motor mounts as well
quote:
hesitated a few times
It could be the fuel filters and not enough fuel getting to the engine.
_____________________________
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? - 2/8/2007 9:23:59 AM
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sfk
Posts: 58
Joined: 2/7/2007
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Hi,
What does a diesel purge mean?
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/11/2007 10:40:01 PM
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Its_Puddin!
Posts: 77
Joined: 1/8/2007
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odd that it runs an hour. Does it heat up at all? Any of the gauges show anything? lights? do you have to wait a period of time for it to kick over?
good luck -
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/12/2007 7:44:49 AM
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sfk
Posts: 58
Joined: 2/7/2007
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It is odd that after it was hesitating (as if lack of fuel), it went back to normal, and later on just died. In other words, doesn't sound like a major failure at first. Now it barely acts like it wants to start and I get the diesel fumes coming up.
I never got any bad signals on the dash. I think I had good oil pressure.....
I did order the device to check for engine compression.
The only other thing I can think of is if the actual whole Fuel injector is bad. I took out the back plug and the oil at the bottom of the injector looks fine (someone had told me that when fuel injectors go bad sometimes they drop diesel in the lower oil (pan) of the injector unit.
Is there an easy way to check to see if the fuel injector is sending out adequate pressure on all 5 pistons. Can I take the glow plugs out, and look in the hole to see if I am getting a fuel spray?
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/12/2007 1:38:52 PM
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Charles Munn
Posts: 244
Joined: 8/19/2006
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It could be a bad fuel filter....
_____________________________
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? - 2/12/2007 1:50:28 PM
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Charles Munn
Posts: 244
Joined: 8/19/2006
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quote:
ORIGINAL: sfk
It is odd that after it was hesitating (as if lack of fuel), it went back to normal, and later on just died. In other words, doesn't sound like a major failure at first. Now it barely acts like it wants to start and I get the diesel fumes coming up.
I never got any bad signals on the dash. I think I had good oil pressure.....
I did order the device to check for engine compression.
The only other thing I can think of is if the actual whole Fuel injector is bad. I took out the back plug and the oil at the bottom of the injector looks fine (someone had told me that when fuel injectors go bad sometimes they drop diesel in the lower oil (pan) of the injector unit.
Is there an easy way to check to see if the fuel injector is sending out adequate pressure on all 5 pistons. Can I take the glow plugs out, and look in the hole to see if I am getting a fuel spray?
If your fuel filter isn't clogged find a shop that repairs big rigs. They can pop test your injectors... On the other hand you can buy new nozzles for less than $100. . It's very easy to open and clean the injectors with brake cleaner, then replace the nozzles. A pictorial at http://www.dieselgiant.com is a big help.... But when clamping the injectors, turn the injectors opposite than the pics.... so you won't crack the chambers... After you've replaced the nozzles, have them pop tested, or make your own pop tester and do it yourself..... You can find plans for making your own pop tester at schumanautomotive.com
If you remove the injectors you must always replace the heat shields!
Still, the fuel strainer, which is located in the fuel tank, may be clogged. Check it by switching the fuel lines, i. e., remove the incoming line from the I.P and place it on the fuel return line coming from the top of the fuel filter... Then put the fuel return line that was connected to the top of the fuel filter, onto the incoming line on the IP... It only takes a minute or so and it by passes the fuel tank strainer.
If the engine runs well, then most probably the strainer is clogged. The other way to check is by doing the diesel purge system ( litre plastic bottle full of diesel with connecting incoming and return fuel lines ) , only instead of a diesel purge, use regular diesel. Again, if the engine performs well, then it's probably your fuel strainer... In which case you'll need to drain the fuel tank and replace the strainer.... I think diesel purge also has a pictorial for that.....
When I drained my tank I used a pella.... which is a hand vacuum pump that sucked out most of the fuel so I had to drain less than a litre of fuel... Which is a big help... Those vacuum pumps are also sold at harborfreight.com for half the price of the pella.. The harborfieight vacuum pump is metal and the pella is plastic...I suspect harborfreight has the best pump.
When you remove the fuel strainer, look into the tank. If it's full of algae, you need to remove it and have cleaned at a radiator shop. If it looks okay, but the strainer is clogged, then after you clean and replace the strainer and fill the tank, you should use a good anti algae additive... It seems the best brand is startron ( that may be mis-spelled) which is sold at marine supply stores...
< Message edited by Charles Munn -- 2/12/2007 2:34:33 PM >
_____________________________
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? - 2/12/2007 6:23:19 PM
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sfk
Posts: 58
Joined: 2/7/2007
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Thanks for the REply!!!! But fuel is not the problem. When I disconnect the primary fuel filter from the fuel pump, diesel flows out (I put car on rear stands and fill tank complely full).
When I push the hand pump I can watch and hear the fuel get pumped back the return line.
Does anyone have any Experience with the Diesel fuel injector iteself going bad? Is there any way to test to see if the fuel injectors are actually pumping out the required pressure?
Just still no idea of why I would get diesel fumes coming out of the exhaust pipe, the glow plugs are hot, and it wouldn't start. This one really has me stumped. Any other ideas out there?
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RE: 1979 Mercedes Engine Dies - What could be the problem? - 2/12/2007 7:19:14 PM
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Charles Munn
Posts: 244
Joined: 8/19/2006
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As I said, in order to test the injectors, they need to be pop tested. That particular test measures the pressure in each injector. You can have them pop tested, or build a simple pop tester and check them yourself. It could be that the injectors are dirty, etc... It's all in my last post.
Since fuel filters are relatively cheap, I'd still, regardlless of flow, first change the fuel filter.
When changing the nozzles in my fuel injectors, I noticeed one injector that didn't seem to have a load on it. I took it to a shop, had it pop tested and it had next to zero pressure. A shim was added, it was again pop tested and up to specs....
< Message edited by Charles Munn -- 2/12/2007 7:23:05 PM >
_____________________________
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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