Just took these (new to me) motors in for "tune-up" in anticipation of 50 + mile offshore fish trips. History - Bought boat in Dec (sold Cape Horn CC for this FAMILY cuddy)from a dealer after a mechanic looked it over and checked compressions, reported all good. --I water tested the boat twice (3 hrs all fine) <br /><br />AFTER the $400.00 TUNE-UP, everything came back good, motors had 339/350 hrs, all under 3500 RPMS, skematic said never been over 5M RPM. No reported problems on this pair from Johnson, and factory updates had been completed<br /><br />...BUT!!!!! mechanic said BOTH motors oil injectors in manifold were BAD and NEEDED REPLACEMENT IMMEDIATELY, he refused to water test after tune up because they would BLOW that soon (I never had warning light ?) The replacement for both is going to be $1,800.00 <br /><br />I let him know both had just been tested by mechanic and checked out fine. He indicated he found the problem with the oil injector and manifold assymbly when he pressure checked oil line and found air. Said both motors were draining back to oil pump when off because the check valves werent holding the oil to the motor. So...The amount of time it takes the motors to pump oil to the injectors durring start up will BLOW them up.<br /><br />I talked to the boat dealer I bought it from who is checking with the mechanic to see if this was possible to miss. The dealer thinks these guys are trying to take me for a ride, and plans to call them tomorow. <br /><br />I dont know what to do ?? I dont have $1,800.00 laying around for new injectors... HELP, SUGGESTIONS, ?? PLEASE....
<br />1 thing I see that would bother me is the fact neither has been over 3500RPM in 350hrs. May be an issue to some, maybe not to others. If the engines are set up with the correct props to allow near 6000RPM, then 3500 may not be a total problem.<br />I'm not going to attempt a guess at your oil check-valve issue....that's a good one for Seahorse or Dhadley....They'll be along soon.