Old Evinrude 3.3 HP river motor

[CaptJB]

I have an old Evinrude 3.3 HP river motor. These motors are distinguished by the fact that the prop shaft is not at a 90 degree angle, very interesting looking motor. The model is 4423 and sn is 87525, I am unsure of the year, I have been told both 1936 and 1947 ? My question concerns a unique part of the motor. There is a chamber next to the exhaust port of the engine. This chamber is about 3/4 inch forward of the exhaust ports. The chamber is vented to the outside via a slide valve and tube that opens as the motor excelerates. What is the purpose of this chamber ? This is the only motor where I have seen such a chamber. Anybody know where I can get an owners or shop manual for this motor?<br /><br />I have not run this motor for over 20 years, but it ran great 20 years ago before I put it away in the garage. I hope to restart it soon!

 

[JB]

Re: Old Evinrude 3.3 HP river motor

The model 4423 was made from 1947 to 1951, Capt.<br /><br />I have no idea what that chamber is, so I will be very interested in the answer.<br /><br />Good luck.

 

[BoatBuoy]

Re: Old Evinrude 3.3 HP river motor

From another post concerning a 1930 4 hp Johnson exhaust outlet. Similar question. "The lever on the back is an exhaust relief cut-out. It reduces exhaust back preasure for starting or high speed running. Other than that, it just makes the motor LOUD." <br /><br />You should be able to get a manual here http://ww3.kencook.com/evinrudejohnsonmanuals/index.cfm?fuseaction=search.main

 

[CaptJB]

Re: Old Evinrude 3.3 HP river motor

Thank you JB and BoatBuoy for your information about my old 3.3 Evinrude river motor. I believe BoatBouy may be right about the unusal part being an exhaust pressure relief, it sure has made a dirty mess under the cowling. JB, if you have any interest in this item I can post a digital picture of the set up, it is rather unusal.<br /><br />Thank you<br />Capt JB