1961 sea horse 40 hp.

[footballhi]

runs good on one cylinder no fire on top plug .change coil for top plug ,now i have fire but still no difference when running. if you pull of the top plug wire. the inside of the flywhell has been through hell ,it is all scared ,but still it fires right up for the bottom cylinder.

 

[steelespike]

Re: 1961 sea horse 40 hp.

Try swapping the plugs around.
You need a good strong spark that jumps at least 1/4 of an inch.Coil armatures should line up with the machined edge on the stator plate.Points should be set at .020 at the highesty point on the cam.

 

[footballhi]

Re: 1961 sea horse 40 hp.

real hot blue spark on both plugs, point gap is @ .20 not sure how to check if the coil armatures are line up with the machined edge on the stator plate.

 

[footballhi]

Re: 1961 sea horse 40 hp.

hi all
cuold it be the timing ,due to the passed damage to flywhell, (in first post) , although it dose fire right up on the bottom cylinder,just fishing for what ever is not working . like the reed valves and all should be fine right. both cylinders are @ 120 even. PLEASE HELP!!!!

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

Hey, this is my motor! I love this motor, it goes through hell and keeps on ticking. I have done all sorts of things to it, and it still keeps going, better than an Energizer Bunny!

If you are not in too much of a hurry to use it, I would take the magneto plate right off and clean it up and replace everything. On first guess, I would just guess that either a condenser went (cause for all the black residue), but since it is still running well, then I imagine that the points are shot.

As far as timing, it is set by the gap on the points. So check that! "All engines equipped with breaker point ignitions use a point setting of 0.022 in. (new) or 0.020 in. (used).

Failing that, I would do a complete link and synch! First things first, check the point gaps on the points...

 

[footballhi]

Re: 1961 sea horse 40 hp.

POINTS ARE NEW SET @.20. GOOD FIRE @ BOTH PLUGS , BUT STLL, TOP CYLINDER IS DEAD!!!

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

That doesn't really make sense. If you have good fire at both plugs, how can you have a dead cylinder. You are not being specific enough. What all have you tried...

1) How did you check the spark. I learned the hard way that just grounding the spark plug doesn't give you a proper enough test for the spark. You basically have to run out and buy a spark plug tester (one that will allow the spark to jump 1/4 of an inch). Or remove spark plug, put an appropriate sized bolt in the spark booty, and hold it exactly 1/4 inch from ground to see if it will spark.

2) I guess there is a chance that the fuel is not getting into the top cylinder although that doesn't make much sense, unless the reed valve is shot. Have you checked the fuel pump? I imagine that it would not run even the lower cylinder if you had fuel proplems. It probably isn't fuel related.

What exactly is scarred under the flywheel? If it was the coil, then perhaps a very large amount of voltage went through to the spark plug and fired into the cylinder either damaging the cylinder, of the piston head. When did you check the compression? After you repaired the coil? Something here is not adding up....

Patrick

 

[footballhi]

Re: 1961 sea horse 40 hp.

i now ,no i do not have a plug tester. i just grounded it on the motor. test compression befor replacing the coil. how do i check the reed valve,or should i. i will recheck all again tomarrow,any thing else i should check?...really all i have done is new points and changed the coil that was not firing now i have fire ,(not tested by a plug test) to both plugs ,... gas and fire should run...but that top cylinder dose not ...

 

[F_R]

Re: 1961 sea horse 40 hp.

The 1/4" spark they keep mentioning is important. You can have a spark plug wire arcing through and still show a "good" but less than 1/4" spark. It is fairly common for the plug wires to arc through where they are clamped to the bottom of the armature plate. There will be a pin hole where it arcs through.

One of the small kill wires coming off the armature plate could be bared and shorting to ground depending on the position of the armature plate (throttle).

Not sure which cylinder the fuel pump is mounted to on that year, but a ruptured diaphragm will flood whichever cylinder it is.

Now about that scarred flywheel. The ends of the coil laminations are to be flush with the machined edge on the aluminum bosses on the armature plate, just under where the coil sits. That sets the proper clearance between the coil laminations and the magnets.

Or, could it be scarred by something getting loose in there and could that something have mechanically damaged some other part, such as a points set. However, in that case it wouldn't have fire. Strike that idea.

Yes, a broken reed would cause it, but that would be rare. Also the motor could have ingested something that got hung up in the reed, holding it open.

Can't be the carburetor because that would affect both cylinders.

These are some ideas (guesses) that might help.

 

[footballhi]

Re: 1961 sea horse 40 hp.

thanks for the help guys i will let all now tomarrow how things are going......

 

[BoatBuoy]

Re: 1961 sea horse 40 hp.

Simple, homemade (but effective) spark tester:

 

[footballhi]

Re: 1961 sea horse 40 hp.

thanks BoatBuoy

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

Hey, I like that spark tester. Very well made. Good Job,

Patrick

 

[footballhi]

Re: 1961 sea horse 40 hp.

hey guys thanks for all the help . it was the plug wire grounding out, now it run and sounds great. i made one of thoughs plug testers and @1/4 inch no fire but @1/8 inch lots of fire. anyway im good to go thanks to this site and all of you all helping folks like me .thanks......

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

Glad we could be of service to another fine customer....LOL!

Patrick

 

[footballhi]

Re: 1961 sea horse 40 hp.

hey guys dose any one now where i can get a new water pump for this motor?now its running good i'lleed one....

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

footballhi,

I ordered mine from marine manifold.com. That is the canadian site. They have a link for the American site if you need it. I imagine you can buy the impeller and any needed seals from here at iboats as well if you like...I'll find the part number and then you can order it....Good Luck!

Patrick

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

All you can get now is the impeller itself. It is from Sierra and is good from 1960-1970. So i imagine that all other parts for 40HP motors in those years are identicle. See if you can buy anything else you need from the actual Johnson parts manufacturer.

Water Impeller, Sierra Part Number 18-3083. Price $14.46 US. (marineparts.com)

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

Water Impeller, Sierra Part Number 18-3083. Price $14.37 US. (iboats.com)

Patrick

 

[Saskatoon2005]

Re: 1961 sea horse 40 hp.

Water Impeller, OEM Part Number 777213. Price $26.99 US. (crowleymarine.com)