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Old 06-18-2017, 07:29 PM   #15
Ed H.
Senior Member
 
Join Date: Jun 2013
Location: Milton NH
Posts: 148
Default Re: Knock, knock, knock sound

Take a long screw driver to see if you can isolate the noise. If it is the timing gear you will hear it through the screw driver shaft. Or if you have a mechanic's stethoscope that will do the same.
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