Boat background: Silverton with twin 350 Chevys, not original, but unknown year 350 rebuilt blocks dressed as Crusader. Holly 4-barrel (square bore), closed cooling and Mallory YL distributors with external resisters. Single fuel tank feeds both engines.
Port engine starts and runs fine at all speeds.
Starboard (opposite rotating) starts fine and runs for about 1/2 hour at headway speed while in no-wake zone. Suddenly dies. No hesitation or misses. Just dies. Cranks, but will not restart. 15 minutes later, will restart and run for a period of time.
First time it happened at low speed, changed out Mallory ignition module #609. Headed out and again died in no-wake zone, same as before. Ran on one engine until end of no-wake (15-20 minutes), restarted engine, ran at 3000 to 3500 for 10-15 minutes, then died.
When running, water temp is 170-175 according to the flybridge gauge, oil pressure is normal, around 40 lbs and voltmeter is showing 13-14 volts.
Both water separator and internal carb filter have been checked and cleaned with nothing of any consequence found. Port engine runs from same tank and no issues, so doubt if it is fuel. Inside of distributor cap is clean, no tracks or burn marks and rotor is also clean with evidence of spark transfer. All wires tight and terminals clean.
Any thoughts, suggestions?
Gene
Port engine starts and runs fine at all speeds.
Starboard (opposite rotating) starts fine and runs for about 1/2 hour at headway speed while in no-wake zone. Suddenly dies. No hesitation or misses. Just dies. Cranks, but will not restart. 15 minutes later, will restart and run for a period of time.
First time it happened at low speed, changed out Mallory ignition module #609. Headed out and again died in no-wake zone, same as before. Ran on one engine until end of no-wake (15-20 minutes), restarted engine, ran at 3000 to 3500 for 10-15 minutes, then died.
When running, water temp is 170-175 according to the flybridge gauge, oil pressure is normal, around 40 lbs and voltmeter is showing 13-14 volts.
Both water separator and internal carb filter have been checked and cleaned with nothing of any consequence found. Port engine runs from same tank and no issues, so doubt if it is fuel. Inside of distributor cap is clean, no tracks or burn marks and rotor is also clean with evidence of spark transfer. All wires tight and terminals clean.
Any thoughts, suggestions?
Gene