1982 johnson leaking at prop any ideas why?

[rdischar]

hello everyone, i recently bought a 70 horse johnson and it runs good as far as iknow its my first boat. the only problem is when i run it hooked up to my garden hose some really black oil leaks (not really leaks but just coats) the outside of the prop where it meets the lower unit also smoke comes out of the back end of the prop while its running. any ideas waht could be causing this any help would be greatly appreciated.<br />THANKS <br />RUSSELL DISCHAR

 

[DJ]

Re: 1982 johnson leaking at prop any ideas why?

rdischar,<br /><br />I do not know what year your engine is but, if it has through hub exhaust, what you are seeing is normal.<br /><br />If you do not know much about the boat. I would do three things.<br /><br />1. Buy a manual for the engine.<br /><br />2. Service the water pump.<br /><br />3. Decarb. the engine.

 

[rdischar]

Re: 1982 johnson leaking at prop any ideas why?

i looked up the yesr by the model # and it is a 1982 it has 2 holes about 1 1/2 ft above the prop where it feels like exhaust comes out. is the oil normal also or does it have a does it have a bad seal.

 

[rdischar]

Re: 1982 johnson leaking at prop any ideas why?

the serial # is j5680201 and the model # is j70elcnb. there is also a very small amount of vertical play in the prop shaft, are the bearings bad.

 

[grid]

Re: 1982 johnson leaking at prop any ideas why?

That's exhaust/unburned fuel. Don't worry about it unless it's clean and clear, or milky.

 

[ob]

Re: 1982 johnson leaking at prop any ideas why?

rdischar, The two holes you mentioned are exhaust relief holes.You will get some exhaust out these as well as the prop hub.While running you will get some waterflow out the reliefs as well if cooling system is up to par.The vertical play in prop shaft could be a problem depending on the severity.Enough could cause prop shaft seals to leak and is indication of worn beraing or bearings.Insure you are checking for this with prop removed to eliminate any play that may be in prop hub or spline.I would highly recommend ,as suggested above that you have the lower unit serviced and install new waterpump kit.If used regularly they should be serviced at least bi-annually.Get a professional honest opinion from a service tech on condition of prop shaft bearings.I could help if I could see motor, or you were able to obtain total vertical movement in thousanths via dial indicator and relay info.