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  #1  
Old 12-29-2011, 08:55 AM
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Valve Adjustment 300SD - Has This Ever Happened?

In my effort to give my '85 SD some assistance with winter starting and better idling when cold (and to prevent another air cleaner mount bracket from cracking), in addition to new motor mounts and rack damper bolt, I recently did a valve adjustment. Rather than help my cold starting, it actually became much worse. I unbuttoned the valve cover and checked the specifications a second time, making a few adjustments. This did nothing to help.

With the weather getting much colder, I tore into the car a third time last night. This time, rather than measuring the gap between the valve lifter and camshaft lobe with the feeler(s) from the passenger side, I measured it approaching from the driver's side. Moreoever, I also jiggled the collar nut on each valve a few times back and forth to break up any carbon and made sure each lobe was pointed in the 1 o'clock position, or opposite each lifter. From this position, most of the valves seemed tight and had to be slightly adjusted. This seems to have made car start better, as I did not have difficulty starting it in 25F weather this morning. Didn't know if anyone else had experienced this same issue or had any helpful suggestions.

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'94 E420 - 99K
'12 C300 4 Matic

Previously owned:
'06 CLK 500K Cabriolet
'85 300SD (Old Smokey)
2002 Boxster
2002 C320 (The five-pointed star Mercedes)
1993 300E 3.2 (Dealership's cash cow)
1979 300SD (Chrome beauty)
1983 300D (Old faithful)
1983 240D (Right lane cruiser)
1977 240D (Miracle of bondo)
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  #2  
Old 12-29-2011, 09:08 AM
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Adjusting valves can be tricky - as a general rule for the OM617 you are apparently better off leaving the gap on the looser / larger side because over time they have a tendency to tighten (so I'm told).

Ideally you should have the cam lobe pointing directly upwards. Lots of people seem to be very strict about this - I'm not so strict about it because I've measured the cam profile and I know that so long as you are well away from any of the lobe "structure" you're good. But even so - lobe pointing up is best.

Push down on the rocker / cam follower to make sure it is sitting on top of the valve stem as you slide in your feeler gauges.

If you have the light - look through the gap between cam and cam follower to see what it looks like. Sometimes there might be uneven wear... then you have another problem. When I bought my car (from a Mercedes expert) the rocker arm groups were incorrectly installed: On the OM617 there is a group of two rocker arms / cam followers over cylinders 1 and 2. The group of three should be fitted to the back three cylinder positions. If you get these positions reversed I found that the arm that holds the rocker arms in place will bend. This means that the cam followers will be at an angle to the surface of the cam. The cam lobe will then only make contact with a side corner of the follower...

Use the whole set of three spanners when tightening the nuts.

Edit:- I assume your 85 has an OM617...
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Last edited by Stretch; 12-29-2011 at 09:11 AM. Reason: 1985 - what a pain!
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  #3  
Old 12-29-2011, 01:03 PM
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yup. you have to measure the gap from the valve cap to the lifter... driver's side. otherwise you get a fulcrum error.

I did the same thing once... ONCE! also, be sure which valves you are adjusting. I find it best to print out a chart, and mark off the ones I've adjusted. E, I, I, E, E, I, I, E, E, I...
looks like a blood curdling scream...
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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
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  #4  
Old 12-29-2011, 01:17 PM
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Quote:
Originally Posted by vstech View Post
yup. you have to measure the gap from the valve cap to the lifter....
...........you have to measure the gap between the rocker arm and the camshaft lobe...........
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  #5  
Old 12-29-2011, 01:31 PM
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Quote:
Originally Posted by Brian Carlton View Post
...........you have to measure the gap between the rocker arm and the camshaft lobe...........
Correct!
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  #6  
Old 12-29-2011, 01:35 PM
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AAAAAAACK! did I transpose them again? criminey!

I know that when you do it wrong, the motor runs like crap! I always follow the FSM pictorial now. very simple with their method.
Dieselgiant's pictorial is decent as well. Mercedes Diesel Valve Adjustment Procedure
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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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  #7  
Old 12-29-2011, 01:39 PM
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Quote:
Originally Posted by vstech View Post
AAAAAAACK! did I transpose them again? criminey!

I know that when you do it wrong, the motor runs like crap! I always follow the FSM pictorial now. very simple with their method.
Dieselgiant's pictorial is decent as well. Mercedes Diesel Valve Adjustment Procedure
............I do believe the ongoing stupidity on here is slowly enveloping..........YOU...........

You're lucky that TF wasn't on the board.
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  #8  
Old 12-29-2011, 01:56 PM
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It must have started off by my stupidity of having to do the same job 3 times to (hopefully) get it right .
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Brian
'94 E420 - 99K
'12 C300 4 Matic

Previously owned:
'06 CLK 500K Cabriolet
'85 300SD (Old Smokey)
2002 Boxster
2002 C320 (The five-pointed star Mercedes)
1993 300E 3.2 (Dealership's cash cow)
1979 300SD (Chrome beauty)
1983 300D (Old faithful)
1983 240D (Right lane cruiser)
1977 240D (Miracle of bondo)
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  #9  
Old 12-29-2011, 02:35 PM
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ya know, that's the SECOND time I've posted the wrong information on this procedure...

I always admit when I'm wrong though... and I'm HAPPY when the correct info is posted!
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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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  #10  
Old 12-29-2011, 02:36 PM
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Quote:
Originally Posted by Brian Carlton View Post
............I do believe the ongoing stupidity on here is slowly enveloping..........YOU...........

You're lucky that TF wasn't on the board.
... I blame lack of sleep, and overworked body from the stinking city forcing my cleanup...
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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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  #11  
Old 12-29-2011, 02:51 PM
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Originally Posted by vstech View Post
... I blame lack of sleep, and overworked body from the stinking city forcing my cleanup...
Yeah.........that'll kick the stuffing out of anybody.

I feel a bit overworked myself today after living in the basement yesterday doing long delayed furnace plumbing projects including plumbing a new kitchen radiator.
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  #12  
Old 12-29-2011, 02:55 PM
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Kitchen Radiator?

steam or hot water?
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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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  #13  
Old 12-29-2011, 03:13 PM
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Quote:
Originally Posted by vstech View Post
Kitchen Radiator?

steam or hot water?
Kitchen. For reasons unknown, the kitchen never had a radiator.

It's a HW system with ten zones............zone valve for each radiator in the house. You've never seen a HW system with cast iron radiators perform so fantastic..........never an overshoot.........unless I screw up the water temperature.
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  #14  
Old 12-29-2011, 03:42 PM
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Quote:
Originally Posted by Brian Carlton View Post
Kitchen. For reasons unknown, the kitchen never had a radiator.

It's a HW system with ten zones............zone valve for each radiator in the house. You've never seen a HW system with cast iron radiators perform so fantastic..........never an overshoot.........unless I screw up the water temperature.

I was thinking about getting those zone valves for my house. My upstairs always is 10-15 degrees hotter than downstairs. All of my original valves are seized.
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  #15  
Old 12-29-2011, 03:45 PM
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Originally Posted by lorainfurniture View Post
I was thinking about getting those zone valves for my house. My upstairs always is 10-15 degrees hotter than downstairs. All of my original valves are seized.
Shoot me an e-mail.

I have a lot of experience with that exact scenario in this house.

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