1966 Evinrude Fastwin - Exhaust Cover water leak

[rickycobble]

Just got this motor to run (roughly) and water is seeping through the top of the the exhaust cover gasket. Wondering what possibilities are causing water to be inside the exhaust housing. Also, when motor is running it has a bad miss every few seconds. Thought maybe this is related to the exhaust cover water leak.

 

[interalian]

Well for a start, the exhaust cover is water cooled, so that's why there's water.

 

[boobie]

What's the compression on it ??

 

[F_R]

About that bad miss every few seconds: Is it a violent bang, like you hit something? Is it happening under power? That is not a miss, it is a worn out clutch dog. It is coming out of gear, rotating 1/2 turn and slamming back into gear--till next time. You can probably feel it jump if you put your hand on the shifter lever.

On the other hand, is it happening at idle speed, like a cough or sneeze? That is called a lean sneeze. Give the idle mixture needle a tweak toward "rich" (counter-clockwise).

 

[rickycobble]

Thanks for the replies. It does the cough/sneeze in neutral at idle and kicks or knocks pretty hard when it does it. I'll try messing with idle mixture and see what that does. I'll check compression tomorrow and get back with that.

 

[rickycobble]

See post #7

 

[rickycobble]

The compression is 90# in both cylinders. Rebuilt carb and new fuel pump. Gas mix is probably around 36:1. I made a short youtube video that shows how the motor in running. Really appreciate any advice.

 

[RCO]

Sputtering/dying is fuel starvation. 1.5 turns out is just a starting point, you will need to fine tune it. You should also run your fuel at the recommended 50:1, the more oil you add you are actually leaning out your fuel/air mixture, and don't get any benefit from more oil. The exhaust cover leak may cause an issue running with the hood on, but isn't related to your low speed sneeze.

 

[boobie]

Get that exhaust cover leak fixed asap. It may be part of your problem.

 

[interalian]

^^Yes - if it's leaking out, it may also be letting water into the motor through the exhaust ports.

 

[oldboat1]

Ratcheting sound would likely be from the starter assembly. Gently pull the cord out a slightly when you hear it -- see it it goes away. It may be fine when the hood is in place, although it does sound like it is hanging at the end of your video. Think I would pull off the starter and check the assembly -- check the pawl.

Change to 50:1 and clean the plugs before more fine tuning. As it is, sounds to me like that first 1/8 turn leaner might be close (actually just before you hit that stall -- point where rpms increase). But first switch to the leaner oil ratio and repair the exhaust leak.

 

[rickycobble]

No Title

I removed the exhaust plate cover and did find what appears to be a water breach into the exhaust area. Referencing the pics below, it looks like someone had used silicone as a sealant and had the screws torqued very high. Had to use an impact driver to loosen them. In the first pic, the breach is to the top right. You can see a brown dirt or rust area leading from water port to exhaust and to the outside of the cover as well. The second pic is a close-up of that area.
Would water get sucked into the combustion chamber with this leak?

In the third pic, there is a nasty gouge in the exhaust surface of the engine block that is about an inch from the bottom on the right. It looks like it could be problematic. Is there an easy way to address this with JB weld or something?

 

[oldboat1]

I would run the screws in and out a few time while opened up, just to be sure the threads aren't buggered up. IMO, the gouges wouldn't pose a problem, but a dab of JBWeld wouldn't hurt. Would expect to see two gaskets sandwiching a metal inner plate -- that what you have? (maybe I have it wrong).

 

[rickycobble]

Thank you. Yes, there were two gaskets sandwiching the plate. Thanks for the suggestion on the threads. What sealant am I suppose to use for the gaskets and threads on screws?

 

[oldboat1]

I use omc gasket sealer -- have some Permatex that works well too. If it's a salt water motor, might put a dab of grease on the bolts and run them in and out. For assembly, a dab of the gasket sealer doesn't hurt. I really don't think it makes a huge difference, although it's a good idea to torque them down again after running as the cover will heat up.