Nissan NS60A Fuel Delivery Problem??

[Sailorkj]

I have a 1988 Nissan NS60A anda few weeks ago it just died during a 3/4 throttle run. I was able to limp in by sqeezing the bulb and forcing fuel into the carbs. Fuel pump right? So I ordered a new fuel pump and replaced it today. In the meantime I drained and replaced the fuel, pulled and cleaned the carbs, and installed fresh spark plugs. Installed the fuel pump today, started and idled fine. Pulled away from dock slowly, low rpm's, everything was fine. THEN when I accelerated to mid throttle, boat planed off and in about 30 seconds engine died?? I got a tow in, cleaned fuel filter and again it started fine and again it ran fine at low rpm's but when I accelerate it died again?? I'm at a loss. Any ideas would be greatly appreciated.

 

[Sea Rider]

Re: Nissan NS60A Fuel Delivery Problem??

If not an electrical component heating up and shutting engine down or small o'rings located at hose connector ends worn out and sucking air into hose, seems 24 year old head gasket with leaking issues and letting small water particles pass to combustion chambers. Anyway change it and take advantage to clean all water paths, perform pistons and internal head decarbon. It's one of the most comon problems at 1/2 to wot throttle that shuts engine down when fuel and electrical related parts are working ok.

Happy Boating

 

[Sailorkj]

Re: Nissan NS60A Fuel Delivery Problem??

I will give that a look, it surely can't hurt as you noted it is a 24 year old engine. I have owned it for 7 years and this is the first real issue after hundreds of uses. I was just surprised that it came on so quickly with no symptoms.

 

[Sea Rider]

Re: Nissan NS60A Fuel Delivery Problem??

Sometimes begins with just mini symptoms unnoticeable at lower speeds, but very noticeable at higher revs specially near or at wot. If outboards would use glycol for cooling down as in cars, you wouldn't need to change head gasket untill a complete overhaul is mandatory. With salt water, gaskets do rust, besides nobody re torques their head gaskets from time to time that are compressed with time and heat not providing a perfect seal between crankcase and head as when engine was brand new.

Happy Boating