[W126 Coupe] RE: Camshaft Snapped

[Sam Sisic]

I've heard that a cam and or a crank shaft can snap in a back-fire
situation when a "geared" type timing set up is used in lieu of a timing
chain. I've heard this from a number of techs while in the process of
building up the motor in my Mustang. Of course, I went with a good
performance double roller chain after finding that out as chains have
some "give" in a back-fire situation preventing damage to those
components. 
I'm not suggesting that this is what happened to John's cam... Just a
thought on what appears to be a very rare occurrence in the case of the
560 motor. It could have been a rare flaw in the casting of the cam
shaft itself, I dare say... Germans are people too. HA!
Anyway, great to hear you have all that repaired and back on the road
again John! I'm sure you're enjoying those H&R springs too! That's the
right set up.
Sam
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Message: 2
Date: Sat, 29 Oct 2005 23:45:59 -0500
From: <airedale at sbcglobal.net>
Subject: Re: [W126 Coupe] Camshaft Snapped! Intermittant Rough Idle
	-Me	too-HELP!
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Message-ID: <001001c5dd0c$d2e02c60$210110ac at JCH>
Content-Type: text/plain; charset="iso-8859-1"

Well the snapped camshaft turned out pretty well, the cam cost $359. and
the labor was $600. Slight additional material charges for 2 new oiler
tubes one for each side and 2 new valve cover gaskets. The engine is
running perfect again fortunately the valves on the #8 cylinder were
closed and no further damage took place. While there I also had H&R
Sport Springs all around and front Bilstein HD Shocks installed with
great aesthetic results and no loss in ride comfort.
John

Message: 5
Date: Sun, 30 Oct 2005 06:42:47 -0800 (PST)
From: A figment of the Imagination <figstir at yahoo.com>
Subject: Re: [W126 Coupe] Camshaft Snapped! Intermitment Rough Idle
	-Me	too-HELP!
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Message-ID: <20051030144247.47357.qmail at web31504.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1


Glad things worked out.  Like I had written and
predicted, it was unlikely you suffered a lot of
damage.  It's too bad you don't know what caused the
problem.  Hope it doesn't happen again.  There's
likely a small chance it will until the root of the
problem is cured. Did your mechanic ever tell you?

Happy driving!

-Figmented