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The reason I'm asking about fan hitting shroud is that the noise only happens on engine shut-down and occasionally on acceleration, which could mean it's a bad motor mount that's allowing the engine to move beyond it's allowable limits and thereby causing the engine-driven fan to impact the shroud.
The other proposed causes (smog pump, pulley bearings, etc.) would cause a constant noise, not just on shut-down and acceleration.
Just a theory.
Best Regards,
Rob
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Robert Fini
'12 ML350 BlueTec, 87k
'06 E320CDI, 270k
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 69k
'97 C36AMG, 313k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)
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