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Old 02-23-2005, 10:46 PM
fz500sel's Avatar
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Do the mid 80's diesels need valve adjustments?

There is a guy I work with that has a 1985 300SD. He has a little over 200K on the odometer. I was talking with him about maintenance on it and asked him if he gets the valves adjusted every 15,000 miles. I was told that this should be done on older W123 and W126 diesels. He told me that he has never had them adjusted because his independent mechanic told him that it was not needed after 150,000 miles. He cited that there is no longer any play in the valves and adjusting them wouldnt have any effect.

85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)
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Old 02-23-2005, 10:53 PM
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What his mechanic told him is BS. ADJUST THE VALVES!!!!
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Old 02-23-2005, 10:55 PM
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Egregious humbuggery.
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Old 02-23-2005, 11:17 PM
Larry Delor's Avatar
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A bunch of malarky.

Tell him you'll adjust the valves for him, and he can watch, as you open them up to their proper clearance.
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Old 02-24-2005, 12:01 AM
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85 was the last year for the OM617 which does need the adjustments.
Adam Lumsden
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Old 02-24-2005, 12:03 AM
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Yeah....Right....Somebody's a little ignorant of MB technical literature.
1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)
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Old 02-24-2005, 07:59 AM
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I think that buddy need to find a new mechanic...........I wonder what other jewels he comes up the oil never needs changed after 150,000 miles?
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Old 02-24-2005, 08:27 AM
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Originally Posted by Carleton Hughes
Egregious humbuggery.
1984 300SD Turbo Diesel 150,000 miles

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