Logo

Help with starting a rebuilt johnson

J

josh hildreth

Guest
" i recently replaced the roll

" i recently replaced the roller bearings in this 1979 johnson 25 hp motor and got it all put back together and find out it wont start i thought that it may have been ignition timming but that can only go on one way i am getting spark and the compresion test show 95psi. on bot cylindersis this good enuogh to start the engine?i am getting fuelthe carb and every thing worked fine before the bearings went out but the thing is i had to make some gaskets for the reed plate assembly i made two gaskets for both sides of the plateand when i turn the fly wheel with the carb off i dont hear the humming noises of the reed vlaves moving well i hear a little bit but not as much as my 10 hp evinrude also i can spray starting fluid in the carb and pluggs holes wich i never ever should do that it was just to see but when i pull the starter rope all it does is kick over once or back fire.also what should i seal the crank case with i used prmatex oh yeah one more thing when i had the motor apart i soaked the crankshaft to connecting rod bearings in disel and ididnt wash them off before reinstaling then could the disel be getting in to the combustion chamber and not leting the fuel ingnite i hope i gave you enouhg info thanks in advance,josh hildreth "
 
"Josh..... It is possible to c

"Josh..... It is possible to cross the s/plug wiring so as the top coil fires when the bottom coil should. The Orange Wire with the Blue Stripe from the powerpack goes to the top coil.

The intake manifold gaskets are OMC part numbers #321479 (inner) and #321573 --->#326260 (outer). If you have any doubts about the gaskets you made, I have one each of these gaskets left in stock.

Sealing the crankcase halves with permatex will not do. You must use a "red" substance called "Gel Seal" which seals in the absence of air. Loctite also makes this substance which should be available at any good automotive type store under the Loctite name of "Gasket Eliminator 518". Clean the crankcase halves with acetone, then apply a 1/8" bead to one half of the crankcase, making sure to circle around the bolt holes, then bolt the crankcase together.

Permatex will not seal properly and will allow the engine to lose crankcase pressure.

I doubt very seriously if that small amount of diesel fuel you mention could interfere with anything. Keep us informed.

Joe
"
 
Back
Top