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luckovertime

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15 hp 82 johnson model number

15 hp 82 johnson model number j15rcnc
i got this motor for free which meant it sat for a long time and was used in saltwater. i disassembled lower unit. new waterpump kit installed. disassembled block removed t-stat and left out. sand blasted all parts cleared all water passages and new gasket set installed. now i can get water to flow from pick up tube with lower unit off out tell tale. put muffs on lower unit and spun shaft with drill motor and can get water out the outlet grommet on water pump housing. i am sure pick up tube and and grommet on water pump are aligned i have taken it on and off atleast 10 times and even put some grease on outside lip of pick up tube. just cant get water flow when in barrel. can get water flow out tell tale when using muffs but have to apply pressure to muffs. any ideas out there???
 
"make sure water level is abov

"make sure water level is above the wtr pump...approx 4" above where the lower unit attaches......ck eng compression...how r u applying pressure,when on muffs?...run in tank or barrel....muffs may be causing u probs."
 
thanks for the fast reply. wat

thanks for the fast reply. water level in barrel is just barely over cavitation plate if more is needed i will have to get crafty with raising the barrel. i could use my trash can but it is full and dont feel like emptying it tonight.

i dont have compression tester here at the house. but it seems ok with the old finger check.

i have to push on both sides of muffs to attempt no water leakage. but im not turning hose on full either. i do get water leaking out lower unit where it meets the mid section.
 
get the water level waaaay hig

get the water level waaaay higher...and i bet it'll pump....if...the imp is stiill good.
 
does the water lever need to b

does the water lever need to be that much higher for more pressure? i thought that if its covering the water intake screen holes i would be good. i have just always used the cavatation plate as a rule of where to fill to. hmmmm.....
 
"it needs to cover...the water

"it needs to cover...the water pump.....u want the pump,submerged,fully.and,i would re-ck that imp,or inst another one,after all the dry running...really....."
 
"thanks i will try tommorow it

"thanks i will try tommorow its too late to run it now.
i have another prob... the motor idles fine, but when i give it gas it will sputter and die. i have rebuilt the carb and think i have it adjusted OK. vent is open on tank, pump ball stays hard. does it need to run leaner then? i have adjusted the lean/ rich screw 1 full turn in either direction 1/8 turn at a time and still dies. any ideas on that...and thanks again for your help."
 
"well,...on the eng prob's

"well,...on the eng prob's,we need to determine,that all is well inside...so,ck the compression....75-80 prob...next,u will need a spark tester...should a good solid 1/4 gap nice blue...r u using fresh gas...have u checked it for water if older fuel,very common..next,the carb orifices,all need to be spotless..clean/clear....adj ls needle 1.5 turns out and fine tune...."
 
Have you checked the sync?

Have you checked the sync?

Make sure full throttle is opening the butterfly to about 99% horizontal...

Then there should be marks on the cam follower... Adjustment may vary by engine type but I'm GUESSING that engine has two marks about a 1/4" apart on the cam. Hook a wire to the carb shaft (that goes through butterfly) with an alligator clip... Turn the throttle until the carb shaft JUST starts to move (the long wire will amplify the movement and make it easier to see)...

When the shaft starts to move the cam follower should be RIGHT between those two marks... Again on that engine I THINK the adjustment is on the carb linkage itself... Small screw you can move back and forth a little to adjust...

As for the carb start about 2 turns out from just seated... Then adjust from there...

If that doesn't work I'd think about pulling the carb and tearing it down and giving it a good cleaning...

Only other thing I can think of is that keep in mind with the thermostat out completely it will take a lot longer to warm up... Make sure it's warmed up before trying to advance the throttle much...
 
"i tried the 1.5 turns out, an

"i tried the 1.5 turns out, and it would idle and rev fine with choke out and it would die when i pushed in choke. so i figured it wasnt getting enough gas. i turned out another 1.5 and with choke open idles fine but dies with gas. gas is new...have decent spark not great but there is spark. i have cleaned the carb a few times and did the rebuild kit.
i will check compression monday when i can bring home tester. but when i had block apart pistons had very small scratchs less than .010" on worst scratch and cylinder walls were very smooth, clean and nice for motor of this age and use."
 
"u r correct...it is not getti

"u r correct...it is not getting fuel or it is getting to much air...(bad carb gasket?)bad seal,suck air between cyl's...etc......r u sure the jet,in the center of the carb in bottom is clear?,float level ok,and is dropping ok,freely?"
 
I'd check the sync if you

I'd check the sync if you haven't already... Sounds like the butterfly is opening up way too soon... ???
 
"double checked butterfly with

"double checked butterfly with what RU said. the butterfly is not going past wide open seemed like it would start to sputter once butterfly was open 1/3 of the way. re-counted where i was at with the lean/rich adjustment which was exactly 2 full turns...sorry thought i was farther out than that.

im not finding marks on cam follower??? the small roller seems to be in the right spot...butterfly is closed at start on twist grip. i have new seals on carb, new float and all that. even changed freeze plug like pieces on carb and double check that they are not leaking."
 
"what about that jet,in center

"what about that jet,in center of carb...clean/clear,for sure?..if not,u need to ck it....number 23
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"the center jet is clear...i d

"the center jet is clear...i dont have the neutral safety as seen but that shouldnt do anything right? the roller(#32) was broken but i repaired it and it seems right. i even checked reed valves all were good and installed new gaskets. i did have small hard white plastic...umm....i will call it a seal that came with kit that i could not find a spot for it. it was 1/8" long, 1/8" round, 1/16" hole through center. i couldnt find it on diagram. and not an old one on my carb but i know the carb is similar to 9.9 motor so i figured it was for that model. ???"
 
re checked carb there was some

re checked carb there was some gunk but passage was clear on #23....curious about the hole just to the left of #22 ....oh and water pumps fine now that i raised the water level...damn do i feel dumb and i work on million dollar aircraft everyday.
 
that is the bowl vent...needs

that is the bowl vent...needs to be open/clear........and thats ok on the water level....i cant wk on aircraft!
 
"ummm....is it possible that t

"ummm....is it possible that the carb linkage #1 could fall down shift rod hole....and would it cause damage to leave and if so can i make another out of hook, small screw driver, umm, clothes hanger???"
 
"I hate it when that happens,.

"I hate it when that happens,...i'd try to retrieve it....getting the right bends,the right stout wire may be a pain...but,can be done."
 
hehehe...so if it falls down t

hehehe...so if it falls down the shaft hole wouldnt it be at the bottom before going into lower unit. cant find the thing anywhere.
 
"if it made it that far,may be

"if it made it that far,may be on top of lower unit....or fall out when u pull it....i sure would triple ck under that carb...it would have to be one tricky rod to do all that...u should put some blue locktite,on thse coupler screws..."
 
i have removed carb and thrust

i have removed carb and thrust mounts and shook and tilted every which way cept upside down and no sign of it...where in the hell could have that lil bugger gone??
 
"YYYEEEESSSSSS!!!!!!!!!!!
Wat

"YYYEEEESSSSSS!!!!!!!!!!!
Water passes out tell tale....engine revs fine, must have been that center jet. fabbed new throttle linkage. cuts out when put in reverse but not in fwd. prob just have to play with lean/rich. thanks JBW your my hero!!!"
 
thanks again...i dont do jets

thanks again...i dont do jets anymore i do war bird restoration...and im more fabricator than mechanic...so when you find that P-51 Mustang at the bottom of a lake give me a call and i could have you flying it again.
 
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