Loud knocking noise underway boat design net does not necessarily endorse nor share the view of each individual post. when making potentially dangerous or. Outboard engine noise 1991 mercury 75hp 2-stroke "knocking" or "banging" noise at 5 mercury outboard motors on the sea marlin fast boat. What could be the knocking noise coming from the engine area? there is a knocking sound that started coming from my car a couple days ago. ifixit. about us.
I have a 85hp johnson that just yesterday started to make a loud knocking or grinding sound, kind of like hitting the bottom. in neutral the motor sounds. Troubleshooting engine noises. a knocking sound in the engine is most likely caused by one of the following . 1. piston slap: makes a sharp metallic noise.. Those are bleeder valves. the clicking noise is the loose pad flopping around inside the caliper. i have the same problem and plan to make some type of retainer clip.
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