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Old 03-28-2000, 12:35 AM
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Join Date: Mar 2000
Location: Southampton, NJ
Posts: 126
I am considering adjusting the valve clearance on my newly acquired '85 300D and am wondering what the best procedure is and what special tools are necessary. Also, if I send this task out to a tech, what should the price be and how long should it take a pro tech. Lastly, I read in a past post that the clearances are .10mm on the exhaust and .35 on the intake--is this correct? Thank You.
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Old 03-28-2000, 08:18 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
You have the right values but on the wrong valves. Intake = 0.010" Exhaust = 0.035". This is for a cold motor, it should not have run in 4-5 hours. They give a Hot spec that adds 0.005" to each value, but its best done cold.

The adjustment is two 14mm nuts screwed to the top of the valve. The upper nut is what the rocker arm pushes on. By turning the nuts counter-clockwise the effective length of the valve grows. Clockwise movement produces the opposite effect. The jam (bottom) nut is rather thin and accessing these two is rather difficult without the special curved thin wrenches MB# 615 589 00 10 00.

We charge an hour labor to adjust the valves and also charge for a new V/C gasket.

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

[This message has been edited by stevebfl (edited 03-28-2000).]
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Old 03-29-2000, 12:00 PM
Posts: n/a

I have managed to do the valves on these engines without the curved wrenches, but it is total murder. It also may cause you to compromise on a setting because it may so difficult to do it one more time to get it more precise.

The wrenches are a good investment if you are planning on driving this car for any length of time at all. With the curved wrenches, it will be much easier to fuss with each valve until you have precisely the correct setting.

They are about $60.00 and probably available from Buy these wrenches and do the job yourself once, and you've paid for the wrenches.

Good luck,

Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles

Last edited by whunter; 07-04-2010 at 04:30 PM. Reason: website name change
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Old 03-29-2000, 03:01 PM
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Join Date: Jan 2000
Location: PA
Posts: 5,440
Stevebl had the right numbers for intake and exhaust but the wrong system. He gave you inch dimensions when it should have been metric.

Correct values are:

Intake: 0.10mm 0.004in cold

Exhaust: 0.35mm 0.014in cold

I just did a valve adjustment yesterday. It is not hard but tedious because I don't have the special wrenches. I use a .003in and .005 gage (go nogo) for intake and .013in and .015in gage for exhaust.
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Old 03-29-2000, 05:59 PM
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Join Date: Mar 1999
Location: Johns Creek, GA, USA
Posts: 5,013
We have the valve adjusting wrenches in PartsShop.
615 589 00 01 00 (set of 2 wrenches)
615 589 00 03 00 (holder wrench)

Bill Wood - Webmaster, LLC

[This message has been edited by Webmaster (edited 03-29-2000).]
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Old 03-30-2000, 09:46 PM
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How much do the wrenches cost?
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Old 03-30-2000, 10:26 PM
Bill Wood's Avatar
Retired Webmaster
Join Date: Mar 1999
Location: Johns Creek, GA, USA
Posts: 5,013
You can get the current prices by entering the part numbers listed above into the search engine in the PartsShop Lobby.

Since we have been adjusting prices a lot lately I would rather have you look up the current price rather than me quoting one in this message. If I put the price in this message someone might read it a year from now and wonder why the price has changed.

Bill Wood - Webmaster, LLC
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