Model # help

[gwukena]

Just picked up a 79 1/2 115, s/n 7131394 first run of ADI. Looking for parts, s/n is not recognized. Could somebody provide model # to use for parts lookup. There is no welch plug on powerhead, as block was replaced in 1982. I know unit rated at crank, what is equivalent prop shaft rating (90)?



Thanks
Gary

 

[carholme]

Re: Model # help

Gary;

115 1979 EL 5168574 - 5600966 7123763

From here:

http://www.maxrules.com/models/Merc_model_files/115-150.html

Here is the parts listing for s/ns 7131213 thru 7147987

http://www.crowleymarine.com/mercury-outboard/1136.cfm

I have never seen a specific chart for the post 1983 crank/prop relationship but in your question, you are talking a 25 hp loss from crank to prop. I have a hard time believing that as we are only dealing with one 90 degree change of direction and minimal loss through a few bearings. However opinions are all over the place. I am sure somewhere there is an engineering paper that has some kind of base formula.

Maybe one of the dealers on here will chime in.

Gerry

 

[gwukena]

Re: Model # help

Thanks Gerry