MERCURY 70 HORSE TROUBLES

[JCBREIER]

CAN SOMEONE HELP ME. I HAVE A MERCURY 70 HP THUNDERBOLT IGNITION #5693068. THE MOTOR RAN OK UNTIL THIS WEEKEND. IT STARTED OK , RAN ALL MORNING THEN WHEN I WENT TO TAKE IT OUT THE NEXT MORNING, IT WOULDN'T EVEN CRANK. I TRIED JUMPING IT WITH THE CAR, NOTHING. I TOOK OFF THE COVER AND I CAN SEE THE STARTER RAISE UP AND ENGAGE THE FLYWHEEL BUT IT WON'T TURN. I TRIED TO PUT THE STARTER ROPE ON IT AND PULL IT BUT IT WILL NOT SPIN. I CAN SPIN THE FLYWHEEL BACK A LITTLE, THEN TURN THE KEY BUT IT ONLY GOES ONE OR SO SPINS. ANY SUGGESTIONS, YEAR OF MOTOR, WAYS TO USE IT AS A PLANTER, ALL WOULD BE OF HELP. THANKS. JOE

 

[12Footer]

Re: MERCURY 70 HORSE TROUBLES

Welcome to iboats, Joe. First, remove the plugs, and see if you can turn it thru by hand. Note the condition of each plug, as they could give a great indication of what went south in thier respective cylinders.<br /><br />If you still can't spin it thru by hand, you must drop the lower unit. This is because there is no qway to determmine if it froze-up in the gearcase, or if a ring broke.<br />If you can turn it thru, rebuild the gearcase (or find a good used one).<br />If not, it's time to tear-into the powerhead.

 

[JCBREIER]

Re: MERCURY 70 HORSE TROUBLES

FIRST, THANKS ALOT. I REMOVED THE PLUGS. THE FIRST ONE WAS PRETTY DRY. THE NEXT TWO WERE MOIST. AFTER REINSTALLING THE PLUGS, IT CRANKED AND TURNED OVER. IT RAN FOR A LITTLE BIT. IT SOUNDED PRETTY GOOD. THEN WHEN I TRIED TO RESTART IT, ITS LIKE IT FROZE AGAIN. IT SEEMS LIKE IT WON'T MOVE AGAIN. I PULLED THE PLUGS AND TRIED TO TURN THE FLYWHEEL WITH A SOCKET BUT NO LUCK. ANY MORE SUGGESTIONS? I JUST NOTICED THAT SINCE IT RAN THERE IS A HOLE IN THE COVER AROUND WHERE THE FIRST SPARK PLUG WAS (THE METAL CASING) THAT SURROUNDS THE MOTOT. I THINK IT WOULD BE CALLED THE HOUSING. THIS CANNOT BE GOOD. I CAN ACTUALLY SEE INSIDE.