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  #1  
Old 07-15-2008, 10:45 AM
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Unhappy God awful ticking sound!

I purchased an '83 300D a few weeks ago (that didn't run) and have been trying to restore to its former glory. With a lot of effort, the car would crank but sounded like total a$$ and blew smoke like a mosquito bomb. Further investigation revealed a bad turbo, leaky intake/exhaust manifold gasket, and a busted down pipe. All that has been replaced and it at least cranks now. Unfortunately, there is still a frightenly loud ticking sound coming from the engine. It cranks easily and runs rough, if you can stand the loud ticking noise.

After extensive research on this site, here's what I've done so far.

1. Loosened each of the injector lines individually, about 1/8 of a turn.

Engine seems to die and fuel leaks from the line at each injector. Looks like I'm getting fuel to each injector. Noise doesn't stop when I crack each one.

The noise sounds like metal on metal, like there's something metal on top of one of the pistons and it's getting smacked around? Bad rod or bearing? Busted prechamber or nailing injector?

2. Removed the injectors, #3 looks wet. The others are dry and very nasty. Engine was injesting tons of oil from bad turbo seals.

Could this be the nailing injector?

3. Turned over the engine with no injectors installed. No loud ticking sound at all. Engine turned over freely. I guess that rules out foreign metal material between the piston and the head getting smacked around. Maybe the prechambers are good afterall? With no injectors installed, therefore no compression or load, can I rule out a bad rod or bearing????

"Master Yoda" has a machine to pop the injectors, so he took them home to check if one is stuck and look at the spray patterns. He admits he's never heard a leaky injector sound so bad. Could this loud noise be an injector problem??????? Thanks in advance!

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  #2  
Old 07-15-2008, 11:42 AM
rrgrassi's Avatar
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Could also be the alternator, vacuum pump, timing chain, etc.

While you have the car down, do a valve adjustment and check chain stretch, but if it ticked while cranking and the injectors in place, and does not with the injectors removed, it sounds like you are on the right path.
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  #3  
Old 07-15-2008, 12:55 PM
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It doesn't sound like it is in the front of the engine. It sounds like it's coming from the middle, number 3 cylinder maybe. Incidently, we did a valve adjustment while we had the manifolds off and they were extremely tight.

I'm just worried that it could be a rod or bearing, which would really hurt my feelings. I just wanted to see what the "enlightened ones" had to say. Thanks for your help!
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Old 07-15-2008, 01:27 PM
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The other test you could have perfromed was to move inj #3 to a different cyl and see if the tick moved with it.
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  #5  
Old 07-15-2008, 02:26 PM
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Was there a pintle in the prechamber? You could be describing early ignition on one cylinder.
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  #6  
Old 07-15-2008, 02:54 PM
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What is a pintle and how would I identify it? I'm learning as I go along. My buddy has the injectors so that he can pop them and check the spray pattern. I will move the #3 to #1 and check to see if the noise moves when I get the injectors back.
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Old 07-15-2008, 03:10 PM
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Under the injector you should see the glowplug sticking out and further underneath that you should see a light bulb shaped protrusion. The fuel hits the pintle and further atomizes. This metal on metal sound, is it really fast? Like much faster than the RPM?
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  #8  
Old 07-15-2008, 03:17 PM
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No, it is the same as the RPM and changes with RPM.
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Old 07-15-2008, 03:31 PM
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Ya take a look down that hole (and all the others). Pray you don't have these problems :
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  #10  
Old 07-15-2008, 03:32 PM
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While you have the injectors out you should run a compression test. Rough running could mean a weak cylinder....and that could lead to the smoking etc.

Tom W
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  #11  
Old 07-15-2008, 04:13 PM
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Winmutt, at risk of sounding like a complete dumbass, what are those?

Walgamuth, I forgot to mention that when the injectors were in and the car was running, dark smoke was coming out of the exhaust at idle. The white smoke that was coming out before was definitely a bad (understatement) turbo.

I don't have a compression tester that can handle the high compression values of a diesel engine. I'll see if I can borrow one though. It'll probably tell me a good bit about my engine. Thanks again for your ideas!
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Old 07-15-2008, 04:30 PM
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I would take the valve cover off again and check the chain stretch and then do a compression test. A stethoscope (long screw driver) could help locate the noise.

The noise could passably be a bad vacuum pump, which is potentially a serious problem. I'm guessing its not a "rod" knocking
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  #13  
Old 07-15-2008, 04:32 PM
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those are blown out pre-chambers. I'll bet the top of the piston looks equally ugly.
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  #14  
Old 07-15-2008, 04:38 PM
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Ahhh, so that's what they look like removed from the head!! I think that's the next thing to look at if the injectors are ok. Anyone know where I can borrow/rent the tools to remove the prechambers? I'll also look into the vacuum pump, although the noise definitely wasn't coming from the front of the motor. Good point about the chain stretch too!
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  #15  
Old 07-15-2008, 04:38 PM
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Quote:
Originally Posted by Rocketrider View Post
My buddy has the injectors so that he can pop them and check the spray pattern. I will move the #3 to #1 and check to see if the noise moves when I get the injectors back.
No point now. Is helpful in determining if the issue is a bad inj or something else. Now, ALL your injectors ought to be good as they are rebuilt.

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