Long story but need some guidance...
Took a leisurely fathers day cruise. Motoring around 3200 rpm all very well and then a loud bang, and a god awful racket from the engine. Shut down immediately and took tow back to dock.
On inspection found spark plug separated in half. Part still finger loose in block, threads appear undamaged. Other half hanging from wire.
Checked compression on all cylinders all compression good (96 to 118) on all but #6, the one with the blow out. This tested at 50 but would not hold pressure.
Put plugs in and started it up. Motor ran and sounded great.
Getting advise from do not start it and pull head immediately. To don't worry about it now. Do valves in the winter.
People with good mechanical exp believe a piece my be stuck in a exhaust valve and it may either clear or should do no further damage
Boat has less than 300 hours. professional tune up was completed as part of a spring commissioning about 7 hours of running time. No evidence of water in cylinder. The metal fitting around plug appears defective it is not crimped fully.
Any suggestions
Took a leisurely fathers day cruise. Motoring around 3200 rpm all very well and then a loud bang, and a god awful racket from the engine. Shut down immediately and took tow back to dock.
On inspection found spark plug separated in half. Part still finger loose in block, threads appear undamaged. Other half hanging from wire.
Checked compression on all cylinders all compression good (96 to 118) on all but #6, the one with the blow out. This tested at 50 but would not hold pressure.
Put plugs in and started it up. Motor ran and sounded great.
Getting advise from do not start it and pull head immediately. To don't worry about it now. Do valves in the winter.
People with good mechanical exp believe a piece my be stuck in a exhaust valve and it may either clear or should do no further damage
Boat has less than 300 hours. professional tune up was completed as part of a spring commissioning about 7 hours of running time. No evidence of water in cylinder. The metal fitting around plug appears defective it is not crimped fully.
Any suggestions
Comment