Scott-Atwater 3.6 compression

[todd281]

I just had a '48-49' Scott Atwater 3.6 horse outboard donated to me. It seems to have low compression 65lbs. I thought at lease 100lbs is what would run and considered "good". I have been looking around the web and seeing powerheads being sold with 60lbs and advertised as "good compression" So did these run on lower pressure than standard?

 

[F_R]

Without having any official facts and figures, I think you are expecting too much. <>65 probably is ok. Just my opinion.

 

[todd281]

Thanks for the input. I do not want to tear this apart if the compression is acceptable . It will not start at the moment, its got spark and gas, but perhaps the valve reeds need to be looked at.

 

[F_R]

It should at least start @ 65psi, even if that is low (which has not been established).

 

[todd281]

well I took it apart found a broken upper piston ring. I`ve been searching the web but it looks like they are not available . if anyone know where I could get them that would be great. if not I will just part it out.

 

[F_R]

His website says N/A, but give him a try anyway. http://www.laingsoutboards.com/scottmccullochparts.html

 

[todd281]

yea I did no rings I ended up e-baying a power head. now I'm in search of a impeller. they seem to be like hens teeth. I was thinking I may have to fab one somehow maybe cut one out of rubber. it is not one with vanes, just the round with a tab type. any ideas?

 

[F_R]

That's easy. These guys make them.

Brian Wilcox. Call 810-794-7685 before 8 pm est please.Or email Baron0418@att.net. please note the b must be a capital.

OR---

Bob Long: http://home.earthlink.net/~flyingscott

 

[todd281]

ha- I just found him on the net and sent a e-mail to him so I am waiting for a reply . Thanks for the address and all the help so far

 

[todd281]

Here is the next question. The impeller in this motor is the" round with a tang type" some refer to them as wobblers . All of the ones I have ever had dealings with were made of rubber, this one is more akin to plastic. Is that the way it is suppose to be ? Or is this thing just so old that it dried out. This may seem silly to ask but this is the first lower I have worked on that has stiff grease in it , so maybe the impeller is manufactured that way. Any insight on this would really help out . Thanks