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Old 08-12-2007, 09:54 AM
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Join Date: Nov 2005
Location: taylorsville, nc
Posts: 358
Question 350 SDL rattle

I'm stumped. My 350 has a rattle at the front of the engine. As near as I can tell, its near injection pump. Still there with fan belt off. It is only at idle and loudest when car is first started. I switched IP with one I pulled at junk yard. Car runs better but rattle still there. The only thing I can think is something lose in cent. timing advance. One of you old MB heads, I need your input. Thanks.

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Old 08-12-2007, 12:30 PM
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smoke gets in your eyes
 
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Location: Eastern TN
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New style or old style vacuum pump? If old style, check that there are 6 balls in the bearing and that the plastic spacer thingy is in place providing adequate spacing for the balls.

What does the crank pulley position when the cam is at #1 TDC?

Sixto
87 300D
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Old 08-12-2007, 02:43 PM
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I put a new timimg chain in about 10k ago. tdc is on mark. Don't know if the vaccum pump is old style or new, any way to tell from exterior view?
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Old 08-12-2007, 02:54 PM
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smoke gets in your eyes
 
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New style has 4 screw heads sticking out of the front cover. Old style has a smooth front cover. Folks have found old style bearing on pumps with new style cover so I'd pull the vacuum pump to give the cam and lever mechanism a proper inspection. Or maybe you'll find another cause such as a lazy chain tensioner first.

Sixto
87 300D
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Old 08-12-2007, 02:56 PM
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There are pics of the new style vacuum pump in the FastLane and Buy Parts links above.

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87 300D
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Old 08-12-2007, 08:04 PM
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Location: Southeast Ohio
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I've seen the tensioner damper fail, making the belt and tensioner jump, making noises..
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Old 08-12-2007, 09:59 PM
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Took the belt off, so it's not belt damper. I have a chain tensioner in my pile of junk yard parts. I will try that. The VP has new style cover but I will check that if the chain tensioner doesn't solve the problem. Thanks for the input, Al

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