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72 100 horse just quit.

P

phawk

New member
my 72 100 horse has set up for several years. I changed the plugs crained the gas tank but forgot the fuel line so it fouled the plugs. I drained the line cleaned the plugs hooked up the muffs to the spicket and cranked the motor. it cranked and i ran it on the high idle to burn off the excess fuel. it ran for maybe a minute or two and shut down like i had turned of the key. I checked the fuel pump and its working fine. I checked fire and it looks great. After trying to crank it several times i checked the plugs and they are dry, like I'm getting no fuel. I know the fuel pump is working, so I'm thinking crank seals or reed. I'm leaning to crank seal but would like a more experienced opinion. is there a way to check without pulling the engine down?
thanks
Pat
 
Reeds do not fail all of a sudden.----------Crank seals do not fail al of a sudden, there is more than one seal.--Motor would still fire and run with one bad seal.---------------Remove flywheel and clean and inspect distributor cap and rotor.-----Inspect anti reversing spring.-----------Check all electrical connections.
 
faztbullet said:
Check carbs to see if they have fuel....or squirt so in throats and see if it will hit.
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you were right, squirted some fuel in carb and it not only fired but ran. it did sputter a little but after 30 or 40 seconds cought up and ran great. I used carb cleaner on the carbs and squirted it into the jets, I guess some was in the carb bowls and priming it pulled it through the system After running it a little I I tested out the gear case by running it a little. it went into forward fine dropped into neutral but when I put it in reverse the motor died. it blew the 20 amp main fuse. So I checked around a bit and found that when in reverse both the green and blue wires were hot. is this correct or do I have a problem. just So you know after sitting up for about 8 years I just took the foot off and took it to a marine mechanic to reseal and after re-installing it encountered these problems. the Johnson manuel I have shows a series of tests but I not sure the guy that wrote it speaks english. You guys make sense with what you say and your directions work.
 
For reverse both solenoids are energized.-------Sounds like the blue wire was pinched when you installed the lower unit.------------------Bench test on it is to connect the gearcase to ground.-------------Then energize the green wire with 12 volts positive.---------Turn driveshaft quickly with a vicegrip on the spline ( protected with cardbard ) and it should be in neutral after about one turn.-----------Connect both green and blue and you should have reverse in about 2 turns.
 
racerone said:
For reverse both solenoids are energized.-------Sounds like the blue wire was pinched when you installed the lower unit.------------------Bench test on it is to connect the gearcase to ground.-------------Then energize the green wire with 12 volts positive.---------Turn driveshaft quickly with a vicegrip on the spline ( protected with cardbard ) and it should be in neutral after about one turn.-----------Connect both green and blue and you should have reverse in about 2 turns.
Click to expand...
Thanks for the QUICK reply! I have not taken the lower unit of as off yet but it does shift into neutral but not reverse. the green wire shows about 5 ohms to ground, the blue wire shows about 1 ohm to ground which I suppose goes right in line with the blue wire being pinched. I'll pull it off and check the wire to see if I can see a pinched spot.
thanks,
Pat
 
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