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Old 05-19-2000, 04:44 PM
Brett S
Posts: n/a
I have a 79 300 SD.The engine occasionally lopes or rocks at idle.
I have read about the rack dampner adjustment. Although I have not been able to find the adjuster.
Could my Timing pump be to old to have one?
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Old 05-19-2000, 06:33 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Yes, the first year to get the rack dampener is the 1980 300SD. There was a service bulletin telling to retrofit the new backing plate onto the old pumps.

If your interested I'm sure I've got a used pump backing plate with a dampener.

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
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