Knot Waiting
Senior Chief Petty Officer
- Joined
- Jun 23, 2006
- Messages
- 761
Been a while since I've posted. Can probably thank all of the knowledge I've gained from the good people here for helping to make me self-sufficient. However, I've got an issue now that begs the insight of the iboats community.
My 1991 SeaRay 260ov with 7.4 Mercruiser 454 Mag, Quadrajet (I think) carb, Corsa Captain's Call exhaust, and 800 freshwater hours; has always been hard to start cold. Pump, pump, pump, crank, crank, crank, stumble, and repeat.... Unless already have been started and run within a day or so of a restart. I attempted to correct this nagging issue by rebuilding the carburetor to no avail.
After the rebuild she slowly started to stumble upon acceleration; unless the throttle was reduced and eased back into (sometimes more than once during a single planing). Then occasionally die at low idle.
Then the carburetor got wet accidentally while cleaning the engine and she developed a through carb backfire that never seemed to clear up (despite through drying of the filter and components). With the last run (4th since wet) of the season being so poor I worried she may not make it back to dock.
Noteworthy issues that could relate are:
*An unexplained "water spray" residue on the starboard interior of the bilge; approximately 14" from the sole and adjacent the riser & bellow.
*Water in the bilge, likely from the aforementioned spray.
*Heavy steam from the starboard thru-hull exhaust during acceleration.
*The port riser becoming excessively hot which was determined to be from an impeller blade that broke free and blocked it's water passage.
Fuel is clean, water separator was replaced twice this season out of theory, and the cap/rotor are new.
Any thoughts on where to start chasing this? I don't want to fire the parts bazooka on my random guesses anymore and am trying not to jump to conclusions either. Hopefully all the info helps narrow ideas down. Thank you in advance for your advice.
My 1991 SeaRay 260ov with 7.4 Mercruiser 454 Mag, Quadrajet (I think) carb, Corsa Captain's Call exhaust, and 800 freshwater hours; has always been hard to start cold. Pump, pump, pump, crank, crank, crank, stumble, and repeat.... Unless already have been started and run within a day or so of a restart. I attempted to correct this nagging issue by rebuilding the carburetor to no avail.
After the rebuild she slowly started to stumble upon acceleration; unless the throttle was reduced and eased back into (sometimes more than once during a single planing). Then occasionally die at low idle.
Then the carburetor got wet accidentally while cleaning the engine and she developed a through carb backfire that never seemed to clear up (despite through drying of the filter and components). With the last run (4th since wet) of the season being so poor I worried she may not make it back to dock.
Noteworthy issues that could relate are:
*An unexplained "water spray" residue on the starboard interior of the bilge; approximately 14" from the sole and adjacent the riser & bellow.
*Water in the bilge, likely from the aforementioned spray.
*Heavy steam from the starboard thru-hull exhaust during acceleration.
*The port riser becoming excessively hot which was determined to be from an impeller blade that broke free and blocked it's water passage.
Fuel is clean, water separator was replaced twice this season out of theory, and the cap/rotor are new.
Any thoughts on where to start chasing this? I don't want to fire the parts bazooka on my random guesses anymore and am trying not to jump to conclusions either. Hopefully all the info helps narrow ideas down. Thank you in advance for your advice.
