Adjusting Valves on 74 450SL - Mercedes-Benz Forum
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post #1 of 16 (permalink) Old 06-17-2019, 01:33 PM Thread Starter
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Adjusting Valves on 74 450SL

So decided it was high time to adjust valves on my 107 and went looking for Hazet 17mm valve adjusting tool only to find they're like hens teeth! What do all of you use to do this (those that donít have Hazet tool)...is there a modern version of this tool? Have read the horror stories using other types of wrenches so want to use right tool for this. Any help here appreciated!!!
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post #2 of 16 (permalink) Old 06-17-2019, 03:53 PM
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I did my 1973 with a common 17 mm crows foot.


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1972 350SL - 107.044.12.000422
117.982.12.000366
Georgia - USA
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post #3 of 16 (permalink) Old 06-17-2019, 07:35 PM Thread Starter
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Originally Posted by masand68 View Post
I did my 1973 with a common 17 mm crows foot.


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Did it go smoothly? How was the fit on the adjusting nuts and did you have any that were difficult to move?
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post #4 of 16 (permalink) Old 06-18-2019, 11:48 AM
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Same substitute tool used here. Those 17mm adjusters are very tight to move (especially when it hasn't been done for awhile). Do not be afraid to crank on them. Toughest part of this job is keeping track of where you are and what type of valve (intake or exhaust) you are adjusting. I used 2 feeler gauges, one with each setting ready.

I printed a diagram and made "complete" marks on it as I rotated the crank to proceed to the next lobe up valve in the train. You will see what I mean when you get into it. I noticed an improvement in performance and definite decrease in noise both times I did this job. I'm due to do it again soon.

Brad Cushman
73 450 SL
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post #5 of 16 (permalink) Old 06-18-2019, 01:12 PM
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Back when I had my w123, there were guys buying wrenches, putting them into vices, blow torching, and then bending them to that nice "bendy" shape needed to get it onto the valve just right.



Worth a shot.
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post #6 of 16 (permalink) Old 06-18-2019, 01:21 PM
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I had no issues with the crows foot. Followed basically the same process Brad described.


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post #7 of 16 (permalink) Old 06-18-2019, 01:28 PM
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And does your car run faster and jump higher? I'm totally guilty of the Keds phenomenon when I work on my car.

Brad Cushman
73 450 SL
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post #8 of 16 (permalink) Old 06-18-2019, 01:59 PM
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The Hazet tool makes it easier. It has a foot to keep in correctly aligned. Crows foot doesn't always hold the correct angle. If you do use crows foot go for quality. I broke the Harbor Freight brand (their good one)
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post #9 of 16 (permalink) Old 06-18-2019, 02:08 PM
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You could also check the tool loan program . Look in EGv107...I have not done this and my car does not have the adjustable valves. But looking at the hazet tool,I wonder if a 17mm box end wrench with a drop down and the one side ground off for an opening would work??Cancel that,just saw the pic of hazet tool.Would take some heavy bending of wrench with a torch...
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post #10 of 16 (permalink) Old 06-18-2019, 02:55 PM Thread Starter
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Originally Posted by rowdie View Post
The Hazet tool makes it easier. It has a foot to keep in correctly aligned. Crows foot doesn't always hold the correct angle. If you do use crows foot go for quality. I broke the Harbor Freight brand (their good one)
This is what Iíve been searching for...unfortunately nowhere to be found..
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