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Charles Munn -> RE: 1979 Mercedes Engine Dies - What could be the problem? (2/12/2007 1:50:28 PM)
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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...
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