1951 W187 6cyl M180 Valve Clearance - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 05-05-2016, 10:30 AM Thread Starter
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1951 W187 6cyl M180 Valve Clearance

Hi,

I'm new to the forum and I can't seem to find any info on valve clearance for earlier models. Does anyone having a service manual could tell me what the gap should be for a 1951 220 6cyl sedan? If not, can anyone point me in the right direction? Thank you very much and sorry for the inconvenience.

Maximo.
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post #2 of 10 (permalink) Old 05-05-2016, 11:15 AM
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There is no doubt that I do not know the answer to your question. However, I do know that the m180 family of engines goes right up to the m130, and the numbers for the m130 look pretty common. If we don't find more specific information for you, perhaps these numbers will work.

1951 W187 6cyl M180 Valve Clearance-imageuploadedbyautoguide1462468507.429118.jpg

This one at least includes ~1962 m180 engines.
1951 W187 6cyl M180 Valve Clearance-imageuploadedbyautoguide1462468956.312901.jpg
1951 W187 6cyl M180 Valve Clearance-imageuploadedbyautoguide1462468967.227882.jpg

0.10mm = 0.00394"
0.20mm = 0.00787"

Getting closer... It looks like maybe ponton numbers were a little lower on the intake valve clearance, 0.08mm. ??? But wait. All 6's other than the 220 had greater intake clearance, 0.012mm
1951 W187 6cyl M180 Valve Clearance-imageuploadedbyautoguide1462469439.984589.jpg
http://www.mbzponton.org/valueadded/...lve/adjust.htm

It's interesting to see that the w187 220 became the ponton 220a.
1951 W187 6cyl M180 Valve Clearance-imageuploadedbyautoguide1462470227.078103.jpg
https://www.mbca.org/star-article/no...-ponton-sedans

.

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Last edited by Fonzi; 05-05-2016 at 11:48 AM.
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post #3 of 10 (permalink) Old 05-05-2016, 07:11 PM Thread Starter
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Thank you so much for taking the time to write back, I really REALLY appreciate it.

I stumbled upon what I believe is the same info on the internet, but my guess is that it refers to post 1956 Ponton engines, named M180.924 and with mechanical fuel injection, delivering 120+HP.

The version I'm after is the engine M180.920, powering all 1951-1955, with 80HP. I'm not 100% sure, but I believe it also powered the Unimog.

Nevertheless, I'll recheck all the attachments you sent me and compare them with what I have to see if I can figure something new out.

Again, than you so much for taking the time to answer, I really appreciate it.
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Quote:
Originally Posted by Máximo Juárez Beltrán View Post
Thank you so much for taking the time to write back, I really REALLY appreciate it.



I stumbled upon what I believe is the same info on the internet, but my guess is that it refers to post 1956 Ponton engines, named M180.924 and with mechanical fuel injection, delivering 120+HP.



The version I'm after is the engine M180.920, powering all 1951-1955, with 80HP. I'm not 100% sure, but I believe it also powered the Unimog.



Nevertheless, I'll recheck all the attachments you sent me and compare them with what I have to see if I can figure something new out.



Again, than you so much for taking the time to answer, I really appreciate it.

I figure that it seems most of the overhead cam solid lifter engines have that similar 0.10 and 0.20 number for the intake and exhaust. I imagine that the adjustments themselves will have margins of error making it tough to be exact.

I tried!

There are probably service manuals out there. But where?!

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post #5 of 10 (permalink) Old 05-06-2016, 08:38 PM Thread Starter
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Thanks again Fonzi. This weekend I'll be trying 0.10 and 0.20 for the intake and exhaust, it can't be that off, and if it is, I'll notice

Couldn't find a single manual on the internet, and I take pride in my "finding-things-on-the-internet" skills.

I'll let you know by next weekend it the issue has been solved. Cheers
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post #6 of 10 (permalink) Old 05-07-2016, 01:11 PM Thread Starter
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Here are some pcitures of the car:
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Very very cool! Thanks for the pics!

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post #8 of 10 (permalink) Old 05-07-2016, 02:05 PM
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Originally Posted by Máximo Juárez Beltrán View Post
Thanks again Fonzi. This weekend I'll be trying 0.10 and 0.20 for the intake and exhaust, it can't be that off, and if it is, I'll notice ...
I'm German and checked the values in a German Unimog forum. The values are correct for the 80hp.

The guys there noticed there exist a former adjustment value for the exhaust (0.15mm) that had to be revised because of burnt valves.

Can't help you further on - only this special question.

Link: Ventilspiel einstellen am M180 - Unimogforum - Militärfahrzeugforum

Regards
Norbert
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post #9 of 10 (permalink) Old 05-07-2016, 02:12 PM
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Bunt valves. That brigs up a good question for neophytes like myself with respect to valve adjustment. I remember hearing "better a little loose than a little tight". I hadn't taken the time to understand this but was thinking it through. If the gap is tight, then the lobe will be pushing the valve down (open) for a longer period, making it more likely to be open when it shouldn't, like during combustion. Closed valves don't burn. Open valves (or just barely closed valves) do. Pretty simple. Right? Is my understanding correct?

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post #10 of 10 (permalink) Old 05-07-2016, 06:46 PM
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I believe you are correct Fonzi. I think nordfish pointed out that they increase the exhaust from .15 to .20. This would allow the valve to close completely when the engine is hot.

"As we know, metal expands and contracts as it heats and cools. Because of this there needs to be some clearance for the metal to expand into. Sometimes it's a little and sometimes it's a lot.

So what happens if there is too little clearance? Well, for one thing the valve loses most of it's heat through the valve seat. If the valve doesn't seat fully it will start to get hotter and hotter. Sooner or later the valve starts to melt or burn. Not good. Now if the clearance is too much the valve train components will be hammered every time the valve opens. Again, not good but better then too hot."

and this good read:
Engine Valve Failure
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