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Old 03-26-2013, 11:46 PM
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Join Date: Jul 2011
Posts: 526
m117 valve adjustment

I should be getting the heads back from the machine shop on Thursday.
Is there anything special I should know about adjusting valve clearances on a 'mechanical' (not hydraulic) m117?
When I took the heads apart I tried to unscrew one of the large adjustment nuts and it seemed to really not want to come loose. I did not force it for fear that there is something I should know about...

'72 280SEL 4.5
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Old 03-27-2013, 03:30 PM
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Join Date: Oct 2005
Location: Bandon, Oregon
Posts: 1,051
If you have the means to install the rockers after you install the cams (a simple home made tool can compress the valve spring down far enough to slip in the rocker) then you don't have to back off the adjustment when you install the cams. You don't want the valve spring pressure pushing on the cams as you install them. The small adjusting nut below the ball is where the adjustment is made. You will need a crow's foot wrench or the proper tool. The adjustment is very stiff so if you use some Harbor Freight crow's foot wrenches they will strip the adjusting nut:-(
Tony H
111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux-Dad bought new
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Old 03-27-2013, 10:51 PM
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Posts: 526
OK, thanks.

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Old 03-29-2013, 10:34 PM
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Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,178
Sunex 9710M 3/8-Inch Drive Metric Crowfoot Flare Nut Wrench Set, 10-Piece -
This is the set I got (except I got it $10 cheaper & free shipping when I got it). No need to spend a fortune - you can get just the one you need (17mm if memory serves) but having the set came in handy for me for other stuff (mainly PS pump replacement on 2 other cars).
2018 Chrysler Pacifica Limited
1999 Chrysler 300M - 214,141+ miles

1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
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Old 03-30-2013, 01:00 AM
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Join Date: Jul 2011
Posts: 526
OK, now I realize why I need those. The exhaust side camtower bolts are also headbolts, so the lash cannot be adjusted with the heads off the engine. Sigh...

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Old 03-30-2013, 01:31 AM
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Join Date: Jul 2011
Posts: 526
Timing mark question

Does the timing mark on the washer that goes behind the cam sprocket line up with the sprocket's key? It can be installed like this, or 180 degrees out.

This is from the junkyard cam and I had to take the sprocket off to take the timing chain off.

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m117 valve adjustment-dscn0728cam.jpg  
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