question regarding and older Johnson

[jeffrey.bean]

Hi all, been wanting to get a little duck,crabbing and fishing boat for awhile, keep putting it off. A buddy of mine gave me a Johnson model QD-19, serial 1704912. He picked it up at an auction then had it in his basement for about a year, he never ran it.
What PM should I do before I try and fire it up? I can put it in a trash can full of water to test it out.
Any idea what year it is?

Well, as long as the motor works, looks like I'm in the market for the boat now.

Thanks...Jeff

 

[F_R]

Re: question regarding and older Johnson

QD-19 is a 1958, a fine motor if in good condition. What it needs depends on what it's received. If the coils have not been replaced, they need to be---no question about it. The old ones have a 100% failure rate. Probably needs fuel system cleaning. A water pump inspection and new impeller at the least.

 

[tashasdaddy]

Re: question regarding and older Johnson

yes it is a 1958 10 hp. correct manuals here "http://www.outboardbooks.com/index.cfm?fuseaction=models.main&year=1958&ID=110594"
proper maintanance, coil,points, condenser,plug wire, carb kit, water pump rebuild, and it should be and excellant motor for another 50 years. check you compression, prior to spending any money, insert screw in guage, and pull rope until the guage doesn't go up any more. 5 -6 times. post those numbers, to see if you have a viable base to work with.

 

[jeffrey.bean]

Re: question regarding and older Johnson

Thanks for the replys, I'll try and get a gauge tomorrow and check the compression, and post the results.

Do you know what the fuel ratio is?

Thanks...Jeff

 

[jbjennings]

Re: question regarding and older Johnson

fuel ratio is 24:1. Awesome power head, annoying lower unit. You'll find it very easy to work on. Probably needs lower unit seals besides the aforementioned parts. By the way, I hope you have a tank for it because it uses a special 2-line pressure tank. They can be found easily on ebay but are kind of expensive. 40 bucks and up seems to be the going rate.
Good luck, I think that is an especially pretty motor!
JBJ

 

[jeffrey.bean]

Re: question regarding and older Johnson

Thanks for the input JB, so I cant use a modern fuel tank with the bulb?

 

[samo_ott]

Re: question regarding and older Johnson

Unless the engine has had a fuel pump added to it you will need the old style dual line pressure tank. I have a few of those engines. You can add a fuel pump if you want, search this forum for how to do it.

Do the compression first. If it's not good then don't sink any loot into the engine.

There's also a thread on this forum entitled 'waking an outboard motor' or something like that. Basically it is the steps to use on an engine that has not run in awhile.

I had to buy all my QD-19's...Nice to get one for free!

 

[tashasdaddy]

Re: question regarding and older Johnson

tank like this ebay # 330202609763 and 330202366860 the are pressure tanks, gas line and air line.

read these: http://forums.iboats.com/showthread.php?t=158086

http://forums.iboats.com/showthread.php?t=158071

 

[jeffrey.bean]

Re: question regarding and older Johnson

I put a compression guage on and pulled the cord 7 times, pressure reads 64 and holding.

As long as thats a good number, I guess my next step is to replace the impeller?

I want to thank every one that has responded, I know very little about motors, but with your help, I'm learning...Jeff

 

[samo_ott]

Re: question regarding and older Johnson

64psi in both cylinders? Make sure both plugs are out when you test and the throttle open and ground the plug wires.

64psi is low. Borderline not usable. Others will have comments on this also. I'd be leery about putting anything into it. Especially since you got it for free and have no $$$ and minimal time invested in it.

You can find the old 10's at AOMCI.org swap meets for $50 or so each usually with good compression.

If you do want to work on it and learn, it's not hard. Pull it apart, hone the cylinders, install a new head gasket and usually that'll do it.

 

[wbeaton]

Re: question regarding and older Johnson

64 psi is low, but as long as you get the same reading in both cylinders I wouldn't worry too much about it, yet. Put it in a can of water and try to run it. You may have to shoot a little gas in the carb to get it to fire. If it runs at all then begin the tune-up process. Otherwise consider if you are willing to put $150-200 into it just to get it to the point of deciding whether it needs a rebuild. It will probably need new coils and impeller at the least.

If it does run then a decarb might bring up the numbers.

 

[Lodgepole]

Re: question regarding and older Johnson

Since the compression is on the low side, it may be that it has not been run and has been sitting a long time. Compression will probably come up some if you spray a little light oil around in the cylinders and try compression check again.