Tapping/ticking noise
#51
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Of course none of this makes sense based on where the tapping noise is coming from--directly underneath the distributor!
Last edited by Powerquest_Baby!!; 05-24-2011 at 09:41 PM.
#52
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Pull the distributor, possibly the roll pin has worked out of the distributor gear, also visually inspect the gear for cracked teeth. Manually spin the distributor and feel for a click. Use a priming tool and spin the oil pump while you listen for the noise. Finally rotate the engine and visually inspect the camshaft drive gear, maybe a tooth is cracked. Those are the only possibilities for noise in that area. Good luck.
--We did pull the cap and the rotor--the rotor was broken and the cap appeared to have been scored/worn away by the rotor. If the gear has cracked teeth I wonder if it could cause the rotor and cap damage we witnessed.
Last edited by Powerquest_Baby!!; 05-24-2011 at 09:45 PM.
#54
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It will probably rule out more things then solving his problems.
#55
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The damage in the distributor is something you need to figure out. I would look very carefully at all components, pull the shaft from the distributor, inspect the lower and upper bushings in the distributor, shaft, everything. Also check the teeth of the drive gear on the cam. Something caused the damage to the rotor, that is very uncommon.
#57
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Ok, well my shop brought in their engine builder and after more testing including taking the oil filter apart (no issues, the oil filter didnt have any metal shavings in it) its been determined that the tapping noise is definitely coming from inside the bell housing and is most likely loose flywheel bolts. Im pulling the engine on Monday and will have a look....Its amazing to me how many things make the same sound inside an engine bay and how many hours and tests it can take to determine what is really going on.
#58
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Metal can be a great conductor of sound. Buddy of mine heard what he thought was a lifter tapping/ticking. When he got into it, it turned out to be a con rod bearing that was hammered flat by detonation and had mashed out like a penny on the railroad tracks. The tick was the bearing hitting the main journal.
#59
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Well, we pulled the motor, unbolted the bellhousing and....all the bolts were tight! We did notice that the motor mounts were loose and that one of the spring washers was sitting in the bilge...
Upon reinstalling the motor (and properly aligning the drive) the tapping noise seems to have disappeared. I havent taken the boat out and run it yet (thats happens tomorrow) so we will see how she does after a full shakedown run.
Upon reinstalling the motor (and properly aligning the drive) the tapping noise seems to have disappeared. I havent taken the boat out and run it yet (thats happens tomorrow) so we will see how she does after a full shakedown run.