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#1
09-03-2010, 01:33 PM
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Problem ? May be maybe not ?
Hi all, Here we go. 85 300SD have been tinkering with it and trying to add some miles and wring things out some. I know that a valve adj/check is in order as well as installing new glow plugs but a new issue has come up. I took the car for a drive on the highway and ran at 65-70 as all the traffic was doing. I kicked it down and it ran upto 80-85 and I slowly allowed it to decelerate again. No problems it actually ran smoothly in chassis and engine. I came home and parked it overnight and drove it again and noticed at speeds between 30-45
there is a fine vibration coming through the accelerator pedal. It disappears almost completely over 45-50. It is an extremely fine vibration and goes up and down with the engine acceleration so it is not drive line. I replaced the belts 2 months ago and they seem fine I may check the adjustment again. It is almost like a humming vibration similar to an electric motor. I am going to check and see if the exhaust might be rubbing or have a loose point somewhere but I do not feel that is it. The tranny seems to shift fine and firm. I just got back from a short highway drive and I believe the power level appears down almost as if the turbo is not spooling up or kicking in at lower speeds the way it did before. Any thoughts ? I know this is vague but I will not be able to take a closer look for a couple of days. Thanks Alan
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92 500E Silver 66k 82 Porsche 911SC 84K 68 Cadillac ( Gone Now ) 03 Suburban Z71 200K 85 300SD 217k From Original Owner ( Dad ) 
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#2
09-03-2010, 01:44 PM
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Check all the throttle linkages to make sure none of it is binding and also that it is fully engaging the throttle 100%. Also a good time to lube all that stuff. I think it would help if you were able to get under the hood with a mechanics stethoscope to see if you can hear anything similar.
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#3
09-03-2010, 02:53 PM
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^ Agreed and inspect your ALDA pressure line and banjo bolts. Start at the manifold, maybe it's beginning to clog up, have a look.
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83 SD 84 CD
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#4
09-03-2010, 03:24 PM
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Check your crank pulley and harmonic balancer.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#5
09-12-2010, 06:44 PM
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Found it!, In correct center and rear muffler hangers broke ( someone used zip ties) 2 broke and let the mufflers hang at odd angle that made very fine vibrations through the foot pedal. I got the parts and am fixing now.
Thanks All
__________________
92 500E Silver 66k 82 Porsche 911SC 84K 68 Cadillac ( Gone Now ) 03 Suburban Z71 200K 85 300SD 217k From Original Owner ( Dad )
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