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#1
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So I bought a 300D
I bought a 1980 300D today, Ill have to pick it up in a week or two but... Before I get it and start messing with it, it has a few issues I need help wrapping my head around. Its a N/A so it barely gets out of its way anyway, but in this car the throttle pedal goes 3/4 of the way down before the engine even starts to rev from idle, it really kinda sucks. Also it has no more of the chrome lines that travel the length of the car anyone know where I could source replacements? And the last and worst part, it has a knock from hell. Ive owned 2 diesel pickups a powerstroke and a cummins. So im familiar with the noise, but thos is a loud knock, definetley something wrong, guy said it was lifter knock? I have no idea I think in might be a valve, doesn't sound like a rod but then again ive only known catastrophic knocking from a honda I blew up for no reason other than that it was its time to go. Could anybody point me in the direction of the knocking and help me get it roadworthy.
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#2
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Where to start.... first, welcome to the old diesel mercedes hobby. The 300 na should provide liesurely acceleration up to a top speed of at least 90 if in good operating condition. The accelerator linkage sounds like it may be missing some key rubber components and not providing full travel on the injection pump, so you can check that with a helper pushing the pedal.
As for the knocking it does not have lifters so it must be another issue. I suggest you make a video with sound and put it up so we can listen to it.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#3
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What walgamuth said... post a recording of the sound.
Could be injector nailing... My 300D was nailing so loudly it sounded like a ball peen hammer hitting something. Two tanks of B99 and a set of fuel filters later, no more knock.
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1991 300D 2.5 "Rocinante" 2002 Golf TDI "Teen Spirit" -------------------- 1984 300D 1966 Mustang I6 3sp 1985 Mazda RX-7 GSLSE 1982 Toyota Supra 1977 Datsun 280z 1971 Datsun 240z |
#4
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Thank you guys, Ill post some pictures and whatnot of my new 500$ family car as soon as I pick it up and get it home.
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#5
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If by the "chrome lines running the length of the car" you mean the impact absorbing strips down the two sides of the car. I'm afraid you are in the same boat as the rest of us. I'm trying to repair/replace the right front and passenger door ones myself on my 123 but no luck. You have to search online and check out wrecking yards and such.
As for the accelerator issue. The fire wall thingy is likely perished and not transmitting full accelerator travel to the injection pump. Easy fix. Can't comment on the engine sound. Sorry. - Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
#6
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Wait, so one question I have to drive the car about 20 miles to get it home but with the throttle issue it only hits about 45. I dont have to get on the freeway however this is TX and 45 on the highway is dangerous big time. Is there a quick way I can rig it to ge full motion back.
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#7
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Have someone press the pedal to the floor and watch the throttle linkage at the injection pump. If it doesn't go to full travel (hitting the stop on the back side of the pump), shorten up the accelerator linkage until it does. It'll get you home at least, once you're there you can worry about setting the rods to the correct length and replacing the firewall pivot bearing if it's toast.
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#8
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What others have said: make sure it's the accelerator linkage and not something wrong with the engine or injection system. As the gas pedal is pushed down, the end of the wonky linkage connects to a pivoting bracket down between the engine block and the injector pump. If you examine the area you'll see the idle stop (a vertical screw with a jam nut) and the limit screw (oriented horizontally not too far from the idle stop) with corresponding tabs of the throttle bracket that make contact at idle or wide-open throttle. If the gas pedal is to the floor and there's quite a bit of travel left before that bracket hits the full-throttle stop, your throttle linkage has an issue and band-aiding it is as much your guess as mine.
Better yet, have a picture. You're looking at the injector pump from, basically, inside the engine - that black apparatus is what I'm calling the throttle bracket and the arrows point to the idle stop (right, lower) and WOT stop (left, upper).
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'82 300CD "Pearl", the very first turbo diesel 123 coupe Totaled 11/23/18, rebuild in progress. '85 300TD, "Artemis". '78 300D euro, "Ol' Red", mostly retired. '85 300D, "Gandalf". |
#9
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Definitely check throttle linkage play. The engine should start reving with a big of throttle. The NA om617 is slow, but not the worst slug in the world.
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-Typos courtesy of my mobile phone. |
#10
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Knock
I have had several of these with a knock, and none were injector nailing. Far too often they are run out of oil until it is too late-damage done. Usually the engine will miss if an injector is nailing. Smell the engine oil. If it smells at all burnt, nailing is not the problem.
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#11
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Quote:
- Peter.
__________________
2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
#12
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Upgrade to autoclub premium and have it towed home to prevent unecessary damage.
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1981 240D Four on the floor, Orient Red over Parchment, bought with 154,000 but it's a daily driver and up to 180,000 miles, mostly original paint and all original interior. |
#13
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Quote:
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#14
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Most of the trim for a sedan is available from our sponsor. Around $15 each piece. The trunk lid trim is NOT available anymore.
__________________
All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#15
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So worst case scenario, it has a rod knock. Would an OM603 or OM605 fit pretty easy if i can source one?
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