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Old 04-27-2005, 02:09 PM
Dalcorn
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Timing M104 Cams (1996 E320)

I lost cam timing when replacing a leaking head gasket on my 1996 E320 (M104). While no CD has been released for the W210 series, M104 was also used in the 124 series and the procedure described in the 124 CD is the same for M104 as that specified in Alldata. Specifically, basic cam timing is set with cylinder 1 at TDC, the variable timing on the intake cam set at full retard, and 4mm pins stuck through the holes in the cam sprocket to align the hole with the top of the cylinder head.

I do this but I am experiencing resistance after I rotate the engine about 30 degrees. It feels like a piston is interfereing with a valve. Does anyone know of a revised or alternate procedure to time cams?

Of some interest, the engine is described as non-interference at 30 degrees BTDC. Should cams perhaps be timed at 30 degrees BTDC?

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Old 04-27-2005, 04:52 PM
Ali Al-Chalabi's Avatar
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I can't speak to the specifics of how to time the cams, but if you got to the DIY section and look at the M104 headgasket replacement article, Steve Brotherton mentions a little about it.

The intake cam has variable valve timing on that engine. It can in either one of two positions. Either with no valve overlap or advanced 30 degrees.
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Old 04-27-2005, 10:19 PM
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In doing a valve job on my 1992 300SE, I used drill bits that fit the holes in the cams. To set TDC, put a piece of rod down into #1 cylinder to get the feel for the piston at the very highest point. The variable timing gear is set at the end of it's travel clockwise. Put the chain on with the slack between the crank gear and the exhaust cam gear.

Tim
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Old 04-28-2005, 09:42 AM
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Are you sure the resistance you're feeling isn't just the effort required to compress valve springs?

I hate timing camshafts. My motorcycle requires pulling the cams to adjust the valve lash. What a pain.

- JimY

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