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Old 08-19-2003, 04:18 AM
otto huber's Avatar
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Join Date: Aug 2003
Location: Alameda California
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Inspecting Diesel injectors

Hi,

When I start my '79 240D first thing in the morning, she knocks real hard and smokes heavily. After several minutes of warming up, the smoke goes away, and the engine sounds like a sewing machine. Runs like a champ. My guess is that the springs are bad on some of the injectors, and their dumping too much fuel into the combustion chamber.
I tried cracking the lines to see if the knock would go away, and it did'nt. Any advice on what to look for when I take the injectors out? Should I even worry about it? I figured I might be wasting fuel or causing harm to the piston. Any advice appreciated. Thanks,

Otto
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Old 08-19-2003, 09:35 AM
LarryBible
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If it clears out and runs smooth with good fuel economy once it is warmed up I wouldn't worry about it. I've run injectors well over 300,000 miles without service of any kind with no ill effects.

You can check them by using an old injector line on one cylinder and bend it up so that an injector can be attached to it so it can be sprayed into a jar or something. Remove all injectors and connect them one at a time to this line and observe the spray pattern. It should be an even rose bud pattern. If not, you can disassemble the injectors one by one and soak the parts overnight in old fashioned, caustic, "boil 'em out" type carburetor cleaner then reassemble. Do them one by one so that there is no chance of interchanging parts among injectors. Cleaning them alone will almost always get the job done without having them checked for correct pressure. The pressure in a clean injector will usually be the same as new.

Good luck,
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