PelagicOne
Recruit
- Joined
- May 13, 2004
- Messages
- 1
87 Force 125 / No Compression on 4th Cylinder:<br /><br />- Newly acquired from wife's uncle<br />- Only 220 hours<br />- Just had lower unit replaced with rebuilt lower unit<br /><br />So I take the boat out for a day of high speed fun on the San Francisco Bay, on mirror-like conditions (5/1/04) and went through about 15 gallons of gas/oil mix. As we're returning to the ramp after a long day, the engine suddenly stops running from a full throttle run. I confirm there's still a half tank of fuel, restart the engine and run for another two minutes, continuing home. Engine stops once again. I wait five minutes and restart the engine. This cycle continues a few more times before I decide to limp home at around 5 knots. The engine gets all the way back to the ramp (an hour later) but sounds like one or more cylinders is either misfiring or not firing at all. It seems to be idling quite high for only 5 kts, and a high-pitched metallic knocking is heard.<br /><br />The next weekend my buddies and I start up the engine in the yard (running the water flush, of course) and discover the plugs are firing, but the fourth cylinder has no compression.<br /><br />I'm guessing either bad piston rings, broken piston, or I'm totally screwed.<br /><br />What do I check next? Any advice is most welcome.