what is the valve clearance on my 1965 190dc and what is the proceedure to adjust the valves. Thanks

Mason

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1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Cold:
Int .004
Exh. .016

Unlike gas engine , the feeler gauge measure is taken between the valve stem cap nut and the rocker, [not the cam base and rocker of gas engine adjustment] , with the high cam lobe facing away from rocker at 180 degrees.

why would the gap between the valve cap nut and the rocker be different than the gap between the cam base and rocker?

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1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Look at the angle of the cam in relation to the valve stem..
How could you expect the two measures to be the same .

I dont understand what you mean. When there is a gap between the cam base and rocker, I would think that moving the rocker would then creat a gap between the valve stem cap nut and the rocker. I dont understand why you would take the reading differently than on a 617 motor where you take the reading between the cam base and rocker.

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1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Someone here (might have been W Hunter, I don't remember who for sure) drew a great diagram of this a while back. I have been searching but have not found it yet. It's on here somewhere.

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Palangi

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There is a gap, but if you draw an ark from the pivot point of the rocker , the distance is longer where the cam meets the rocker than where the valve stem meets the botton of the rocker . This results in a different measurement. [ Geometry 101] This is where the Factory wants you to adjust/measure their measured specs.
You asked for the Factory specs , I got them from the Factory Service Manuals , and there is a NOTATION for YOUR chassis/engine that states "**** Gap feeler measure is taken from between the rocker and valve stem gap nut on the 190dc engine"
I also see you have a posting asking the same on the other forums checking on this answer , so wait til you get info from there , as you seem to reluctant to except the Factory info I have looked up for you.
Take the gap anywhere you want , i have given you the correct measures and procedure , as requested..........................

Mason:

Most likely reasons for the recommendation:

1: Ease of setting the clearance and making the required measurement, and/or,

2. Rocker arm ratio, i.e. clearance at one end is greater than the other because the mechanical advantage (rocker arm ratio) is not 1:1 but some other value, like 1.5:1.

Most rocker arm systems have different distances between the cam contact point and pivot point and the valve contact point and the pivot point, hence the term "rocker arm ratio" which is the quotient of pivot/valve contact distance divided by the cam contact/pivot distance. Make sense?

Regardless of the specific reason always follow the factory recommendation, and also ensure the heel (rounded part) of the cam lobe is facing and centered over the rocker arm contact point, i.e. the high point of the lobe is facing fully away from the contact point.

230/8

I had it posted in tech help, because I was trying to get a quicker response. Not checking on your answer. I just wanted to understand the concept. Sorry to irritate you. i just like to know why sometimes. Thanks for your help

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1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Quite all right..Glad you have your answer now.
The problem with double forum posting is you have many others looking into info/data when the request has , unknowingly to them, already been filled . So, it waste time and band space, as well as Archieves storage..

But , no problem, a I see your post has been correctly answered at both forums..
With your chassis , I would just address any tech questions directly to the one forum you did not use , Diesel... These guys will have any answer you could possibly need , as they are very hip on diesels..........
Tnx for the reply

sounds good. the problem is i adjusted them wrong. So I will be doing it again today. Even adjusting them wrong made the motor fire right up. They were way tight

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1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000

Very good..
Too tight on a diesel is bad . As another poster noted , the Manuall Specs. actually show another Notation recommending opening the intake lash up a bit in real cold climates on that chassis. **[ int/.006 at temp lower than 5F. ]

The valve clearance should be adjusted by measuring the distance between the rocker arm and the cap nut (all OM621) and NOT the rocker arm and the cam lobe ( "Diesel Engine Manual,om636/621)
Intake-0,15mm
Exhaust-0,35mm
Yes,there was a diagram posted that showed why that is. Just follow the recommendations.
I wonder why the rocker arms aren`t under some spring pressure,like on gas engi
nes for example???
Vengerov, om621.918