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#1
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Odd low speed vibration
OK, I'm no idiot, but I cannot figure out where this vibration is coming from.
at speed it's nearly imperceptible. but from not much above idle, to about 35mph, it increases in feel. I'm beginning to suspect an engine misfire... but the motor sounds so smooth, and pulls soo strongly. it feels like a shudder in the driveline, but it does not increase much with speed... almost like an imbalanced flywheel would feel... I have gone over the suspension. there is a bad tie rod end near the drivers wheel, the lower ball joints are in need of repair, but not bad yet, the cv joints are heavily cracked, and the driver's side is leaking (makes a neat spray pattern of oil on the floorboard... the flex joint in the rear is showing some cord, and cracking slightly, so that is #1 on my list to fix asap before it comes apart! the tie rod is #2, followed by the ball joints. the vibration is not felt in the wheel, but when braking I can feel it in the pedal. and during driving, I feel it in the seat of my pants... any patterns to follow to trace this? I suppose it could be the tires, but I don't know. I'm gonna swap rear to front and see if it moves. I know I need an alignment, so that's on the list too.
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#2
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Quit eating beans and turn the subwoofer down?
I second the tires spec if you know you need an alignment.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#3
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May be that flex disc. You can only feel something in brake pedal or seat, that tells me the rear end is where you need to focus.
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83 SD 84 CD |
#4
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Great.
lemme know if you have any suggestions to help me isolate the source.
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#5
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A close visual inspect of other items, the center bearing in particular. Jack the car up and try to rotate the drive (propeller) shaft, feel for looseness.
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83 SD 84 CD |
#6
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I'll throw it back up on the lift today and check that out.
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#7
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Best to pull the driveshaft and check the 'stiffness' of the joint. They usually get very stiff with age as the grease dries up. Unfortunately, there's no grease fitting and the joint is staked in the yoke. There's a driveshaft shop near here that I want to stop by someday and see what they will charge to repair one.
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#8
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well, I didn't get time to put it on the lift today, brother's work truck broke down, and had to go change fuel filter/pump/oil/filter.... fun. I smell like gasoline!!!! ugh!
I'll get it on there tomorrow... wish me luck!
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#9
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I had a similar vibration in my 82 240D project car last week. I had looked at the drive train and didn't see anything, upon crawling under again I discovered a rip in the center bearing support rubber. All fixed now. It wasn't easy to see. Have another look at the upper part of that rubber bearing support.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#10
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Check the rear trans mount. I once had a small rock jam in it. It made the car shake like you describe. Until I found it I thought the drive shaft was about to fall off.
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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 |
#11
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LUCK!
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83 SD 84 CD |
#12
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Get someone to drive beside and behind you...
and look at your wheels and tires... and do it at the worst speed.... Then go to the other tests...if needed...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#13
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I've been thinking of that same thing... if only I had someone not busy I could do this with...
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#14
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tires...
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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