Evinrude 1975-15504C - Lightly Salted

[Scaleman]

1975 - Model 15504C Manual/Pull Start - Low Hours - Like New<br /><br />Engine unfortunatley happened to be lying in three inches of SALT water on Saturday AM, you know enough to get inside and visit the cylinders and all the electrical parts. Tide came in while on a hunt and the engines where supposed to be on high enough ground. I was not there when it happened and I asked what side the motor was laying on and neither of my two friends remembered. I seem to think it was the coil side.<br /><br />Engine was immediately sprayed inside and out and cylinders cycled numerous times. Engine store sprayed inside of engine as well. I also parked it in the garage under two 500 watt lights to dry it out.<br /><br />The stator and coils were soaked and the spark plugs were removed and water poured out of my Buddy's Johnson 15hp 2004. So I figured it did on mine too. We tried old coils off of old engines from my Buddy's out board cemetary on the Evinrude. No luck. I think the problem is in the stator. Unit will not turn over or run at all. The closest I have come is exhaust smoke after it almost stayed running this AM.<br /><br />Any suggestions? How can I test the stator? I also did order a manual (owners and service) as well as a parts manual but I did that last night on-line. Should the whole thing be taken apart? I do not have any experience with this or any outboard. All I have done is run 'em.<br /><br />I know and I read about the "directness" of this site but I had to post this as a "OH NO" This engine, boat and trailer was purchased by me on Firday night and I intended to use it the very next day but my wife was sick and I was unable to go on the hunt because I had to care for our daughter. I let two of my friends use the boat. I have never even run the engine yet. Bummer!

 

[DJ]

Re: Evinrude 1975-15504C - Lightly Salted

The situation is NOT good. Did you remove and clean out the carburetor?<br /><br />If you have a good clean-blue spark, the electronics may have survived.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

No DJ I am planning on getting the engine to a mechanic but that may not be until Tuesday with the holiday. I am pretty mechanicially inclined but not too sure of this as I have never messed with an outboard before. This engine being very important to me I need it fixed correctly. It will be used in the cold and I need reliability. We sprayed everything real good with CRC Powerlube.<br /><br />Top Cylinder #1 good spark<br />Bot Cylinder #2 very faint<br /><br />ENgine ran fine prior to this happening

 

[DJ]

Re: Evinrude 1975-15504C - Lightly Salted

Time is of the greatest importance after a dunking.<br /><br />All the mechanic can do, short of a complete teardown is to get the spark back and see if it runs.<br /><br />In the meantime, you also need to get penetrating oil down the carb. throat to lube the crank and rod bearings. Do so, by laying the engine, on its back (spark plugs down), open the choke and throttle butterflies and spray lube down the carb. throat. Turn the engine over, with the rope, a few times and repeat.<br /><br />This is probaby best done with the spark plugs out.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Roger, on my way to the garage now DJ

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

After the holiday I finally reached my mechanic. What should I tell him other then the truth or will he know what to do?

 

[surlyjoe]

Re: Evinrude 1975-15504C - Lightly Salted

dunkings are pretty common, any good O/B mechanic has done at least a few. like they said, pull the plugs and carb and oil the **** outa it until you think its lubed up good,douche out the carb and then clean the ignition up till you get good spark. it should be OK.<br /><br />its alot worse when they go under while running!

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Thanks a million. I was a little concerned after I spent the $$$ and let two of my friends use the engine for its maiden voyage and whammo a salt water bath. In speaking to the mechanic today he said he thinks the points are bad giving it the five minute evaluation. He is an old timer and said by palming the fly wheel and turning it that the compression is good. He is going to check it out though as I need it in harsh weather conditions. Water pump is also getting replaced as it is time. One of my friends also told mne that those older engines get the copper tube clogged up. Should this be a concern?

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Forgot to mention this. When we had it running in the AM we were 20 minutes in the dark looking for water to pump out the engine. We opened up the lid and did not see any water line. Is the water going out the foot without any visual indication such as the visual stream on most outboards. If this is the case, can a line be plumbed in and installed so I know I am pumping.

 

[mikeyzx2]

Re: Evinrude 1975-15504C - Lightly Salted

I think either '78 or '79 they started installing telltale "pissers". The water does go out with exhaust, I'm not sure but I think these smaller motors had ports that water spray came out of.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Thank you everyone!<br /><br />Results on above:<br /><br />New points, new coils, carb clean and re-gasket, compression OK and impeller replaced. Up and running. Mechanic said motor runs strong. I'm happy and hunting on Saturday in my new boat.<br /><br />Another question though...I figured I keep it in this thread as traffic is huge. Nice site though. I like it.<br /><br />Alright here goes, think skeg on a larger hp motor. Looking at the back of the motor listed above. If you were to draw an imaginary line down the center of the motor through the prop shaft would the vertical fin on the lower unit on top of the cavitation plate be slightly offset to port from bow to stern or is mine bent? I did not measure but it seems to be acting as a factory casted skeg I presume to ease steering. Is this true?<br /><br />Reason I ask is I measured and installed a Dol Fin on a flat fabrication table to stay true and turned the motor over and whammmo and extra 1/4" on starboard and I like to work under a 1/16". Wooops! I think it is installed properly though. I really think that portion of the lower unit is cast that way at the foundry. <br /><br />Appreciate some feedback.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Thank you everyone!<br /><br />Results on above:<br /><br />New points, new coils, carb clean and re-gasket, compression OK and impeller replaced. Up and running. Mechanic said motor runs strong. I'm happy and hunting on Saturday in my new boat.<br /><br />Another question though...I figured I keep it in this thread as traffic is huge. Nice site though. I like it.<br /><br />Alright here goes, think skeg on a larger hp motor. Looking at the back of the motor listed above. If you were to draw an imaginary line down the center of the motor through the prop shaft would the vertical fin on the lower unit on top of the cavitation plate be slightly offset to port from bow to stern or is mine bent? I did not measure but it seems to be acting as a factory casted skeg I presume to ease steering. Is this true?<br /><br />Reason I ask is I measured and installed a Dol Fin on a flat fabrication table to stay true and turned the motor over and whammmo and extra 1/4" on starboard and I like to work under a 1/16". Wooops! I think it is installed properly though. I really think that portion of the lower unit is cast that way at the foundry. <br /><br />Appreciate some feedback.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Apologize for the double whammy. My connection is slow and I did not think I hit the reply button when in fact I did.

 

[Solittle]

Re: Evinrude 1975-15504C - Lightly Salted

The skeg is there to protect the prop. Often they get bent slightly but that does not impact either operation or performance. Some folks will try to straighten it out resulting in a broken skeg - not a good idea.<br /><br />Why did you install the Dol Fin? It can help in some situations but be a drag in others.<br /><br />Where is the cavitation plate relative to the bottom of the hull? And what is your max rpms at WOT? These will tell us if your engine is set-up properly for best performance.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Apologies as I been on vacation in the Dominican Republic and returned and have been swamped at work.<br /><br />Engine running good but have determined that I may not have needed the Doel Fin. I noticed that the boat builder had built the engine mount straight and the engine is not all the way down so the boat will not fall over onto plane. She is plowing. I need to readjust the transom engine mount. The cavitation plate is below the stern about two inches.<br /><br />I know the engine is a 1975 and my Buddies is a 2004 15hp Johnson. He is twice as fast. I am told that HP was rated at the head back then and now at the prop. I also realize I am 30 years old. I can see that age could play a part but the engine seems strong.<br /><br />How do I test R's at WOT? Do I need to buy a photo tach and shoot it at the flywheel? I saw one in Harbor Freight for $49 as I would not use it often. Ideas?

 

[Solittle]

Re: Evinrude 1975-15504C - Lightly Salted

You need to raise the engine so that the cavitation plate is even with the bottom of the hull. Thennnnn - Test the max rpms at WOT. If you don't have a tach google out "tiny tach" - I have read about them here but not use one. Once you get the rpm readings you need to find out if the reading is the max called for for your engine. If not you will need to raise the engine or reprop.<br /><br />You are lucky to get it running again.

 

[Scaleman]

Re: Evinrude 1975-15504C - Lightly Salted

Darn lucky Solittle, darn lucky.<br /><br />The transon mount board is 90 to the waterline. Engine is on the last pin and I think the hull is not laying over. I think the standard transon is @ 11 degrees. Mine is 0 degrees. I was doing 14 kts and now I am 16 with an adjustment. My experience with running outboards it just seems it is not turning up.<br /><br />I have the standard issued prop. I forget the size. 9.5 - 10 I think it is, not certain. It is the size recommended in the manual though, I know that.<br /><br />I will search out a tach and pick one up. Excuse the ignorance but I guess each time the spark fires it is measured and an engine rpm figured?