1982 johnson 115 rebuild question

wooleybooger1224

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May 20, 2003
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have block at machine shop now, checked ring seals and they look fine as well as bearings, going to have bored .020 on all 4 cyl.s crank journals look ok but after cleaning crank checked and found wear on #1,2 and 3.(side to side clearance if rod was bolted to journal) is there a tolerance? the manual i have says nothing about this clearance, if there is wear do in need a new crank? don't want to spend all the money on pistons and machine work then find out i need a crank, thanks for any input
 

wooleybooger1224

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Re: 1982 johnson 115 rebuild question

can anyone out there help a poor boy out that want to go fishing?
 

wooleybooger1224

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Re: 1982 johnson 115 rebuild question

please help out there guys, give some input for me, appreciate it
 

Hooty

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Re: 1982 johnson 115 rebuild question

Don't worry about side to side movement. Just be sure crank journals are round, in spec and no cracks.<br /><br />c/6<br /><br />Hooty
 

wooleybooger1224

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Re: 1982 johnson 115 rebuild question

thanks for the reply, but there is an issue of wear and metal missing, don't get me wrong, just think rods will walk causing premature failure, if not good for me, "its about time for a break" thanks for the input
 

Hooty

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Re: 1982 johnson 115 rebuild question

The rods are kinda self aligning. Look at the side to side movement of the rod on the wrist pin. It ain't wear, that's the way they're machined.<br /><br />Put 'er back together and go fishin'!<br /><br />c/6<br /><br />Hooty
 

wooleybooger1224

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Re: 1982 johnson 115 rebuild question

just checking out there in iboat land!!! just want to make sure, double sure about this topic of the clearance ("side" clearance between rod and throw on the crank) don't want to be like the carpenter that cut the board twice and its still too short, thanks again guys, this site is awesome, any other ideas or input is verrrrry appreciated!!!!!
 

P.V.

Chief Petty Officer
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Mar 14, 2002
Messages
452
Re: 1982 johnson 115 rebuild question

ANY wear on the crank and you will be able to see/feel it ! Often, I will "clean" up the journels with a strip of wet and dry/600 grit sandpaper with engine tuner as a lube. Also be on the lookout for any "blueing" which is signs of heat. Bad dog!! I can say that I've rebuilt many, many OMC's and I never "mic" any journals, just look and feel. I usually replace those caged wrist pin bearings with the loose style that all engines use today! Good luck!!
 

wooleybooger1224

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Re: 1982 johnson 115 rebuild question

i appreciate the input, but, i'm not talking about the piston end of the rod, i'm talking about the crank end. i.e. the crank end, installing rods and there is wear side to side where the rod journals bolt up, the bearing wear is ok. not where the bearings will run, but the "side clearance" if u inverted the crank outside of the block and installed the rod, you would have movement up and down where the rod bolted to the crankshaft. thanks again guys, maybe its me not understanding boat terminalogy, since my background is small diesel, gas burner engines, automatic transmissions, and a/c compressors, this is my first attempt at a 2 stroke outboard and i don't want to fail now if u know what i mean, my experience tells me either this crank needs replacement or it can be machined and thicker rods(side to side) can be installed, since there is actual wear. i'm, i guess its my checkbook thats scared about this, i've spent 650.00 on the motor, ran it once going to spend 500.00 to bore and new pistons, gasket set 135.00, carb rebuild 60.00 and if crank needs replacement 550.00, and i haven't even paided myself. maybe i'm over my head. i sure hope not! once again i thank u guys for this outlet and all the information!!!!!!
 

Hooty

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4,496
Re: 1982 johnson 115 rebuild question

I understood your question both the first and second time I answered. If my answer isn't satisfactory, then by all means, go buy a new crankshaft and a new set of rods and quit whining. <br /><br />Hooty
 

aceman

Recruit
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May 17, 2003
Messages
3
Re: 1982 johnson 115 rebuild question

wooly, if you dont have any noticible damage type of wear or missing material ,due to metal passing through the rod side clearance then there is no need to worry about this clearance.<br /> these engines have piston end guided rods and the crank runs vertical so as long as there is sufficient clearance you are in good shape <br />you are looking for more clearance than less, this spec needs alot of floating/ thrusting clearance , not a tight fit like on a crank guided rod <br />there are no over/undersized rods or cranks for these motors . and yes we do understand you are talking about the rod big end. hope i've answered your question , ed
 

wooleybooger1224

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Re: 1982 johnson 115 rebuild question

thanks aceman i appreciate your patience with me, i just want to make sure, i was being understood correctly, i am new to this and want to do it correctly the first time. i hate that i obvious upset hooty, he was imformative.
 

ob

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Aug 16, 2002
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6,992
Re: 1982 johnson 115 rebuild question

Wooly,Let me shine some light on your concern.One of the reasons for the design feature of what would appear to be excessive side to side rod to throw clearance has to do with the means in which your engines rod bearings and wrist pins recieve their lubrication.Unlike a pressured oil circuit ,they rely on atomized two cycle oil vapors to reach the critical contact points of friction.Hope that helps some.
 
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