ForcedInduction's 1982 300D - Page 6 - Mercedes Forum - Mercedes Benz Enthusiast Forums


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Old 11-26-2016, 02:52 AM
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Got bad fuel at the Kum & Go on the 412 turnpike. Some stumbling at first and I changed the fuel filter with little difference. 100 miles later it got worse from stumbling to pinging. I switched over the fuel lines to my spare jerry can of B20 and after a minute of revving it to 2500rpm to burn out the fuel in the injection lines something mechanically failed inside the engine.

I rented a u-haul and towed back to Colorado where I will do some proper diagnosis later today.

My suspicion is bad fuel caused explosive detonation instead of combustion, damaging the precombustion chamber. Loosening the injection lines makes no change. It still starts easily cold at 30*f, it just stumbles and knocks as in the video. I've had bad results with 5-20% "Bio-mass" fuel (NOT biodiesel, "bio-mass" is cellulose based) causing smoking and rough idle so I try to avoid any stations that use it, but this was the last station for 20 miles and I was already in reserve for 15 miles.

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Old 11-26-2016, 03:47 PM
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Found the cause to be a failed injector melting the prechamber. The knocking was the prechamber tip bulging and touching the piston from the heat of the flame and pressure from the broken pieces blocking the tip orifices.
No damage to the cylinder head or piston.

I have a used prechamber but I will have to wait until Thursday to rebuild the injector.
Attached Thumbnails
ForcedInduction's 1982 300D-prechamber1.jpg   ForcedInduction's 1982 300D-prechamber2.jpg   ForcedInduction's 1982 300D-prechamber3.jpg   ForcedInduction's 1982 300D-prechamber4.jpg   ForcedInduction's 1982 300D-prechamber5.jpg  

ForcedInduction's 1982 300D-prechamber6.jpg  

Last edited by ForcedInduction; 11-26-2016 at 03:51 PM.
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  #53  
Old 12-01-2016, 09:45 PM
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Rebuilt the injectors. Found the Colorado "gold" was flaking off internally and caused the injector to stick.

The engine runs great again but still knocks. A small piece of metal must have passed through a prechamber orifice and wedged between the piston and head. Next task is to pull the head, clean the piston and check for valve damage.
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Old 12-08-2016, 07:57 PM
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Got the head off and found the metal making the noise.
Since it wasn't run under load there is minimal damage and the sharp edges were cleaned up with a dremel.
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ForcedInduction's 1982 300D-piston9.jpg   ForcedInduction's 1982 300D-piston10.jpg  
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Old 12-09-2016, 07:54 PM
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Got it running, back to normal!
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Old 01-30-2017, 11:59 PM
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Alternator was failing to keep up the battery charge and would drop below 12.6v if my electric cooling fan came on. I replaced it with a Bosch AL129X 115amp model. It was mostly bolt-in except it would not fit between the frame and engine from the bottom like the stock AL117X 65amp alternator so I had to wedge it past the heater hose from the top. I also added a 6ga wire from the alternator to the starter terminal.
Now even with the cooling fan, heater, lights and air compressor running it doesn't drop below 13.8v

At the same time, I upgraded the stock direct drive SR67X starter with a gear reduction SR97X model that is lighter and cranks the engine faster.
UPDATE: The SR97x is not strong enough to crank the 617 series. I replaced it with the spare ST67x that has been on my shelf for 8 years, it has a thicker motor cable than my other and cranks better than ever.
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ForcedInduction's 1982 300D-1compare.jpg  

Last edited by ForcedInduction; 02-10-2017 at 06:32 PM.
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  #57  
Old 02-10-2017, 06:30 PM
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Replaced the driveshaft center support with my shore-50 polyurethane filled version. Old one was totally shot and would rattle around in 1st and 2nd gear.
But, I found the u-joint has seized bearings in the shaft end. Stupid me tried to move it and now it violently shakes the whole car above 40mph.
There is an 85 300D in the local pull-n-pay and an 80 in the next one over. Hopefully one has a usable shaft....
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ForcedInduction's 1982 300D-cc.jpg   ForcedInduction's 1982 300D-cc2.jpg  
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  #58  
Old 02-22-2017, 10:57 PM
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The 85 indeed had a perfect driveshaft. It was even already removed by somebody that pulled the engine so I didn't even have to work for it!

HUGE improvement. Zero vibration, its literally like driving an entirely different car.

Last edited by ForcedInduction; 02-22-2017 at 11:03 PM.
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  #59  
Old 03-18-2017, 11:33 AM
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Found an economy gauge from an 84 280CE with no burnt traces. Reset the needle to measure boost 5-14psi and painted them with Model Master Florescent Red.
Got the spare engine on a pallet, all the holes plugged, cylinders fogged and the block filled with coolant to prevent rust. I will make a valve port cover later.
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ForcedInduction's 1982 300D-1eco.jpg   ForcedInduction's 1982 300D-2spare.jpg  
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14, 1982, 1982300d, 300d, air, filter, forced, forcedinduction, fram, fuel, induction, mercedes, mercedesbenz, mile, om617952, pump, weight

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