1968 20 hp jhonson impeller

[nightprowler]

I just picked up a 1968 20 hp jhonson,looks clean i put it in the barrel one pull she started up. trans works fine but no watter was coming out of the hole. so figured it was the impeller, i ordered an impeller than started taking apart the lower unit, there was allot of water there by the way, but the impeller looks fine. this is my first impeller job i have seen shot impellers and this is not a bad one. any advise? please help i am tired of putting around with my9.9 i get there but slow
thanks.

 

[tashasdaddy]

Re: 1968 20 hp jhonson impeller

back wash lower make sure pick up is clean, also flush water up the water tube. that motor has to be in a barrel, with water 1/2 way up the leg, it is not self priming.

 

[nightprowler]

Re: 1968 20 hp jhonson impeller

ok so I cleaned everything i put the impeller back on does it matter witch direction it goes i should of but did not pay attention when i put it back together!!! and i cant seem to get the trans bar two screws they separate the two bars
thanks again
tony!!!!

 

[samo_ott]

Re: 1968 20 hp jhonson impeller

It doesn't matter which way the impeller goes on.

 

[nightprowler]

Re: 1968 20 hp jhonson impeller

thank you steve i didnt think so, but what am i doing wrong with the shifter i cant seem to get it back together right everything els went smooth. Is there a trick?
Thanks

 

[samo_ott]

Re: 1968 20 hp jhonson impeller

No trick. It should move easily from F-N-R. If the engine is not running and the throttle is as low as it will go, does it shift ok?

 

[F_R]

Re: 1968 20 hp jhonson impeller

No trick, just do it. But the "trick", if there is one, is to use a flashlight to peer in there and make sure the notched rod aligns perfectly with the screw hole before attempting to insert the screw. If the screw rubs on the edge of the notch, it will wipe the threads off every time. Then the screw will fall out, but never at dockside. Always 5 miles out to sea.

 

[eavega]

Re: 1968 20 hp jhonson impeller

I trans works fine but no watter was coming out of the hole.

Hope you got the shift linkage figured out, but back to the original question; the 1968 20 HP Johnson does not have a telltale. The cooling water exits through the exhaust, which is underwater when you are running the motor. If you are running the motor in a barrel (as you should be) your best bet is to check the temperature of the cylinder head. If it is getting too hot you will know in a very short amount of time.

-Eric

 

[nightprowler]

Re: 1968 20 hp jhonson impeller

well the screws do look a bit rounded, so ill have to get new ones. but the motor seems to be running great otherwise, im gona go putt around the fox river cast for some smallies maybe ill get lucky and hit another muskie. thanks for all the help, and practice catch and release guy's
Thanks again for the help

GO HAWKS!!!!!!