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#1
10-18-2010, 10:49 AM
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My Wife's 300SD Has The Shakes and Drinks More!
We own two 300SDs, 1981 and 1982. The 1981 has developed a noticeable shake when first cranked in the day. The air cleaner does the St Vitus' Dance. In time it will smooth out. Acceleration is normal. I have recently adjusted the valves and even went back a second time to insure that I had them all adjusted properly. The shock mounts on the air filter housing are all new. The only other recent variable is that I have used about three tanks of fuel from a different source (BP). For the last 10 years, I have exclusively used QT Diesel from one of their high volume truckstops. I have used the same number of tanks of BP fuel in my 1982 and it shows no effect.
One final thing. It appears that the MPG for the 1981 has gone down slightly (from 23 to 20). Slightly clogged injector? Any other ideas?
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!) 
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#2
10-18-2010, 11:04 AM
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Check your glow plugs, a failing one or two will produce the symptoms you describe.
Depending on your location, you be using a winter blend of fuel, it may have less energy per gallon, which equals lower mpg.
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83 SD 84 CD
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#3
10-18-2010, 12:16 PM
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I thought the shakes came after you quit drinking... ? oh we're talking about cars, never mind.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#4
10-18-2010, 02:32 PM
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I know what a bad glow plug will do. This shaking lasts longer than a bad glow plug can produce.
I live in Georgia. It's still in the 70s in the afternoons. I don't even know if we go to a winter fuel here. Also, my other 300SD isn't experiencing the same mileage drop - yet!
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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#5
10-18-2010, 02:59 PM
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Let me rephrase my terminology. My "shake" really is a resonant point that has suddenly shown up. Rev the engine and it goes away. Let is idle back down and it returns. I've also tried adjusting the idle up and down to try to get around this resonance.
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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#6
10-18-2010, 03:33 PM
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Adjusting the governor idle pin might be a viable strategy.
Quote:
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#7
10-18-2010, 03:50 PM
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tangofox007, I had forgotten about the idle complensator. I know him well.
Hey, Atlanta (really Stone Mountain) is in the northerm half of the state!
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!)
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#8
10-18-2010, 06:35 PM
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My 300SD is doing the same thing. And if you let it warm up a little, during the transition of temp, it will intermittently miss. I am going to check glow plugs soon. It seems to behave worse when it has less than 1/4 tank - perhaps tank strainer is clogged.
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Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi
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#9
10-18-2010, 09:08 PM
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how are your engine shocks, and motor mounts?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!! 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#10
10-18-2010, 10:50 PM
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Go back to your other source of fuel quick. A diesel purge is in your future.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#11
10-19-2010, 09:38 AM
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Hope you are right on the diesel purge suggestion. My '82 300D is doing the same thing Tom's 300SD is doing. Scary as hell.
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1980 300SD (Mr. Sparkles), 1976 450SEL, 1982 300D turbo, 1989 VW Cabriolet morphing into a td cabriolet  , 1997 TDI Passat, 1996 piece of Jeep,1993 F150, 1990 F250 7.3L...i think that's it, for now.
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#12
10-19-2010, 10:22 AM
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My engine mounts are brand new. I used Uro mounts. The right engine shock absorber is new the left on appears OK. The resonance gets better upon reaching operating temperature so I didn't think the mounts/shock were the problem. This is my first installation of Uro Engine Mounts. I always have a can of Diesel Purge on hand. I also plan to go back to the trusted source of fuel.
Let's revisit the lowered fuel mileage. About 2 months ago I replaced one of the gears in the odometer. It had one tooth missing. Could I have something binding the odometer which is causing the indicated mileage to be lower than it actually is? Could this binding have been the cause of the broken tooth?
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!) Last edited by Tom Evans; 10-19-2010 at 12:19 PM.
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#13
10-20-2010, 09:57 AM
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I would investigate the drop in MPG's as a separate issue. If you have known distances between points, you should start there.
I also have fresh engine mounts & shocks, a fresh valve adjustment but I have a symptom you do not mentions, an occasional miss. Thus the reason I am leaning towards a partially clogged injector. I hope to be able to do a purge this weekend. My hands may be full doing service on mine and my brothers' jeeps. I will keep you posted if you do the same! 
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1980 300SD (Mr. Sparkles), 1976 450SEL, 1982 300D turbo, 1989 VW Cabriolet morphing into a td cabriolet , 1997 TDI Passat, 1996 piece of Jeep,1993 F150, 1990 F250 7.3L...i think that's it, for now.
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#14
10-20-2010, 12:11 PM
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Here are today's updates.
I adjusted the idle compensation pin last night for minimum air filter shake. Got some pretty good results. Drove it today and I still feel some "roughness," but it is better. I may try a pair of Lemfoerder motor mounts. If that doesn't cure the idle resonances, I can keep the Uro motor mounts for the next time I need mounts on my other car. Since my other car is a 1982 300SD, I'm going to swap the speedometer heads between cars for a tank of fuel and see if the fuel mileage problem switches cars. That way, I'll know if it is an odometer problem or not.
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!) Last edited by Tom Evans; 10-20-2010 at 12:28 PM.
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