Thread: 1971 300SEL 3.5: what is the check valve next to the cold start injector?
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Old 04-12-2011, 12:00 AM
werminghausen werminghausen is offline
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Quote:
Originally Posted by bwostosh View Post
the auxiliary air valve,

It flows air when cold and shuts when hot, take it off test in boiling water, Hold with tongs, dip the bulb in the hot water, blow thru the top to test These go bad and operate similar to the radiater water thermostat.
Hi Brian, no, it is the other check valve connected to the valve housing.
The valve seat is not closing properly
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