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Skipper
Posts: 7
Registered: ‎08-12-2018

1997 Johnson 150 ocean pro rebuild questions

I recently lost the port bottom cylinder. Sent the block off to have it resleeved and other cylinders honed. I used the original pistons except the bad one was replaced. New rings, cleaned pistons, polished crank and checked to see if in spec everything looked good, checked ring gap also in spec. Oiled bearings and pistons/rings with 2 stroke oil, I fashioned a fixture for my cordless drill to spin engine rotating assembly. I see what looks to be striation marks where ring gaps are at but no gouge. I checked area with fine pick to see if I could feel the marks and I can’t. Spins over freely by hand and with my spinning fixture. I disassembled the rotating assembly and removed pistons from cylinders and inspected no signs of scuff or striation marks on pistons everything looks good. SHOULD I WORRY about this or continue with the build. Assembly spins freely and with noise or bind. I did check piston fit in cylinders without rings, pistons fit good and moved freely without binding. What’s yalls take on this

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Admiral
Posts: 7,488
Registered: ‎07-14-2011

Re: 1997 Johnson 150 ocean pro rebuild questions

From your description it sounds like you did everything correctly. It is possible the marks you see are the lines where the edges of the rings contact the high points on the honed cylinders as they move up and down the bore.

 

Be sure to use a double oil mix during break in, 10 hours at varying speeds, Mix 50:1 in the fuel tank if you have the VRO (OMS) connected and operational. If premixing exclusively without an oil pump, break in at a 25:1 ratio.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



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The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.