valve adjusting tool

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Scottyx
S Class
Posts: 96
Joined: Wed 26 Sep, 2018 8:57 am
Model you own: w108
Region: New South Wales
Location: Carlingford

valve adjusting tool

Post by Scottyx » Fri 02 Nov, 2018 5:04 am

Hi there

I have a 1971 280S and think sooner or later I will have a crack at adjusting the valve clearances. The manual mentions a special tool. Where can I buy this tool, I looked on ebay and saw a couple of different types.

Thanks
Scott

CraigB
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Re: valve adjusting tool

Post by CraigB » Fri 02 Nov, 2018 8:40 am

Different types being one that looks like a spanner and one that is a u shape with socket connection? Either will do the job but i have the spanner type one. Earlier cars like the 250 (M114 I think it is) I think are 14mm but yours is 17mm being a 280 M130. Some people just use a good quality spanner but when you look at the consequences you don't want to round it off. Did you realise it is just an interference fit thread that locks it in position.

Car that is new to you, I would check the tension on each. I had one go loose on a car and wind itself down and lucky the rocker didn't pop off and do damage. To do this you just need to pop the rockers off - from memory i carefully used a lever to push the valve spring down (while 'off cam') and then the arm and spring will easily come out, pushed to the side. Keep those rocker arms in the same positions when they go back. With all the ball adjusters now exposed get a decent quality socket and a tension wrench with the correct reading. If it clicks then they are tight enough and within spec. The added advantage of this is that sometimes a car that has been sitting or not adjusted for a while, they can seize up, and no better way to free it than with a decent socket right around the flats on that adjuster. Once rockers back on, go about your adjusting as per normal.

I don't know the spec off the top of my head and think i wrote it in my manual - when i get to the shed will look it up if someone doesn't see this first - JG was the one that informed me way back then..... probably 10 years ago now.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

Scottyx
S Class
Posts: 96
Joined: Wed 26 Sep, 2018 8:57 am
Model you own: w108
Region: New South Wales
Location: Carlingford

Re: valve adjusting tool

Post by Scottyx » Fri 02 Nov, 2018 1:44 pm

Thanks mate

Pete49
Adenauer
Posts: 343
Joined: Thu 09 Oct, 2014 4:42 pm
Model you own: w123
Location: Pt Augusta Sth Australia

Re: valve adjusting tool

Post by Pete49 » Fri 02 Nov, 2018 2:02 pm

When I did the '75 W116 450 I purchased the spanner that fits a socket bar as I saw some had been rounded of. When I got the spanner I miced it and found (as was said) that it was 16.5. 17mm too loose and 16mm won't fit.
Pete
1978 W123 300D Maple Yellow
1981 W123 300TD Classic White (now sold)
1983 W123 280TE Champagne
1975 W116 450SEL Silver blue

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Bartman4800
300 SLR
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Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: valve adjusting tool

Post by Bartman4800 » Fri 02 Nov, 2018 3:59 pm

Scott,

I have this tool. I can take some pics tonight if you want.

If I was you, I would buy an open spanner - heat it up and bend it to the correct shape.
If a 16mm does not fit, open it up slightly to match the nut

Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

CraigB
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Location: Hawthorndene (Adelaide)

Re: valve adjusting tool

Post by CraigB » Fri 02 Nov, 2018 6:38 pm

I will have to check my tool but i thought it had 17 written on it. That might work what Bart has suggested but I can say that my tool is quite heavily reinforced with the extra contact faces, thicker than any spanner i have seen and so i know I can use it with confidence. If you check out the price of a new adjuster, that one off purchase of the tool looks a bit better and whenever I have seen well used ones on ebay they always go for a good proportion of new price - if you decide you don't like the car anymore! If you try to use a normal spanner and it feels really tight, you can always pop the rocker and use a socket to get it moving.

And that tension to check the adjuster is OK is 15 to 22 ft/lbs (2-3 MKP)
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

Djenka018
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Re: valve adjusting tool

Post by Djenka018 » Fri 02 Nov, 2018 9:34 pm

21/32" is 16.67mm and wrenches could be found in this size

Perhaps leanish a 16mm spanner or if access is available from above, there are roller matrix socket spanners that self tightens to any size (used for worn out heads)

Just a thought...
'80 450SLC 3-continental

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