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Old 01-28-2007, 06:09 AM
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Join Date: Apr 2006
Location: Ohio
Posts: 94
Id'ing hardened 103 cam from older cam?

Hi all,
I've got an '87 300e with the original soft (worn to nubbs) camshaft. MB and the parts suppliers only sell the later, harder camshaft. This cam also requires different rocker arms.

I just purchased a cam and rockers from a used parts supplier and what showed up appears exactly as my old cam down to the 22 stamped on the sprocket flange. If I understand correctly the hardened cam should have the numbers 49, 50, 56 or a 57 stamped on the sprocket flange and the rockers should have a "noticible" pad welded to the face that rides on the cam.

Can anyone confirm or deny my info???


Bob Kopicki
'87 300e
'85 XJ-6
'76 GMC C-15
'67 TR-4

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Old 01-29-2007, 08:17 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Yes & yes. IF those parts have lasted 20 years already, then I'll bet they will run a lot longer.
MERCEDES Benz Master Guild Technician (6 TIMES)
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Old 02-02-2007, 12:04 PM
Registered User
Join Date: Apr 2006
Location: Ohio
Posts: 94
MB Doc,

Thanks for the reply. I put the "new" cam in with the "new" rockers and while there replaced the valve guide seals (the reason for taking the valve cover off in the first place), front cam seal, upper timing cover lower seal, valve cover seal and just about every rubber air hose on the engine. Started right up! I've still got some suspension work to do and maybe next week I'll have the car off of the jack stands. I'm still a bit concerned about a rough idle right after start, but I'll be running that by the forum if it is still present after a few hundred miles (if my cylinders are as gunked up as my plugs were it's going to need some running to clean it out).

Thanks again,

Bob Kopicki

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