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#1
11-27-2006, 10:25 AM
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Help: No compression in valve 6
Hi,
I own a 95 C280 with 180,000 miles. This weekend, on local highway drive I was testing the brakes and alignment, then accelerating back up to speed. After braking hard, the engine started to bog down. A mechanic did a compression test, and found that there was only 15psi in cylinder 6. In Top Dead Center, he tried to pressurized the cylinder, and said he could hear the air going into the intake valve. He thinks that something is keeping the intake valve open. Has anyone ever heard of this? What could it be? Help: Thanks
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David Weis Old Rides================ 70 250 73 450SL 78 300D 88 Grand Am Current Rides============= 95 280C * 98 SL500 * 
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#2
11-27-2006, 10:36 AM
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Not too common, but could be broken intake valve spring.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#3
11-27-2006, 01:54 PM
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Yep, it is rare but, I've seen broken valve springs before on 6 zylinder models. They get weak and break.
I would remove the valve cover next, and see what broke.
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#5
11-27-2006, 05:55 PM
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Quote:
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2007 C 230 Sport. 
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#6
11-27-2006, 08:12 PM
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Right, shouldn't take much effort or time. I think that motor is a M104 and the valve cover should come off quite easily. The suspect valve will have valve spring retainer that is lower than the others, indicating issues.
With the proper air hold device(the same one used to pressurize the cylinder), the broken spring can be replaced without removing the cylinder head.
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