Flying Scott question

[FillupD]

I hope I can ask this in this forum, if not please direct me.

I am working on a 1962 75.2hp Scott McCulloch motor and have a question about fuel mixture. It states on the cover to use 100:1. Is that info still good with todays oil?
Also I don't see where the water outlet is, at least I don't see anything anywhere, maybe thats why its getting hot.
I have had this motor for around 3 years and supposedly it was rebuilt before I got it. I just started working on it. I am trying to figure out the switch, so far I have 3 of the wires hooked together and it runs. The white wire activates the starter and there is a purple one I'm not sure where it goes.
I'm going to try to find a motor specifc manual. Any advice about getting to the water impeller would be appreciated.

I am fixing up a 59 Crestliner Voyage 15. Pretty fun with alot learned and a lot to go.

 

[1946Zephyr]

Re: Flying Scott question

Ahhhhhhhhh an old Flying Scott. Interesting old motors. I think you would be better off running the mixture around 24:1 or 32:1. It's a lot safer on the moving parts and it helps it run cooler. There's a possibility that your pump may be in need of replacement. I'm not sure about these, but the smaller Scotts have the pump above the water line and just under the powerhead, which I think was a bad idea. Simply because they pump air before the water reaches it and it only takes a few seconds to burn out a dry waterpump. If you're looking for a manual for one of these, then you may want to post a want ad at www.aomci.org and someone there may help you out. There is certain members there who are in the Scott interest groups and can also help supply you with parts. This particular motor was not uncommon in the Scott line and there are still some around.

Good Luck, I hope this helps.

 

[F_R]

Re: Flying Scott question

I hope I can ask this in this forum, if not please direct me.

I am working on a 1962 75.2hp Scott McCulloch motor and have a question about fuel mixture. It states on the cover to use 100:1. Is that info still good with todays oil?
Also I don't see where the water outlet is, at least I don't see anything anywhere, maybe thats why its getting hot.
I have had this motor for around 3 years and supposedly it was rebuilt before I got it. I just started working on it. I am trying to figure out the switch, so far I have 3 of the wires hooked together and it runs. The white wire activates the starter and there is a purple one I'm not sure where it goes.
I'm going to try to find a motor specifc manual. Any advice about getting to the water impeller would be appreciated.

I am fixing up a 59 Crestliner Voyage 15. Pretty fun with alot learned and a lot to go.

I think you will find that the 100:1 was only with McCulloch oil. That stuff probably is kind of hard to find nowadays.

That is what started the whole oil ratio war. OMC was forced by the competition to change theirs to 50:1 in 1964. Merc said their motors were too precision to run that way, but later they too had to change.

The water pump is sort of conventional. Just drop the lower unit off. As I remember it there is a little cover plate on the side of the midsection to get to the shift rod for disconnecting.

Purple wire goes between the choke switch and the choke solenoid on the motor.
A jumper wire goes between the Bat terminal on ign sw to the choke switch.
Red wire goes to Bat terminal on ign switch
White wire goes to start terminal
Black wire goes to ign terminal. Leads to the ballast resistor
Green wire goes to other end of the ballast resistor..Leads to coil + terminal

This really belongs on the "other outboards" forum.

 

[JB]

Re: Flying Scott question

I think I would use a 50:1 mix with that engine. The special Mac oil isn't available any more and I am sure that 24 or 32:1 would be richer than needed.

 

[FillupD]

Re: Flying Scott question

Thanks for the switch wiring, works good, now if it would only cool down. The dealers around here do not want to even hear about old motors, Yikes!

I'm on the lookout for water pump/impeller advice, so if you have any, I would be tickled to hear it.

Thanks, Phil

I think I may have found a source for impellers. There is a picture of one for a 40/45/75HP motor. I really hate to try to drop the lower unit down without some kind of idea what is going to fall out or not come apart.
I don't see a inspection plate on the side.

 

[F_R]

Re: Flying Scott question

Thanks for the switch wiring, works good, now if it would only cool down. The dealers around here do not want to even hear about old motors, Yikes!

I'm on the lookout for water pump/impeller advice, so if you have any, I would be tickled to hear it.

Thanks, Phil

I think I may have found a source for impellers. There is a picture of one for a 40/45/75HP motor. I really hate to try to drop the lower unit down without some kind of idea what is going to fall out or not come apart.
I don't see a inspection plate on the side.

This guy knows all about them:
http://www.scottatwaterinfo.com/

 

[F_R]

Re: Flying Scott question

I really hate to try to drop the lower unit down without some kind of idea what is going to fall out or not come apart.
I don't see a inspection plate on the side.

Is this not it????????

 

[FillupD]

Re: Flying Scott question

Thanks for the Link.

F_R, The motor I have does not have that plate on it. I don't see anything that can be taken off to see a connection to the rod except maybe taking the shifter apart where it goes into the lower cowling.
I'll get a picture of it and post it tomorrow. Thanks for your help with this. I hope I didn't steer you in the wrong direction. I assumed I have a 1962 because the serial number is 62307530 with a ID # 1696.
I'll take pictures of both sides of the motor, maybe I am missing something.

 

[FillupD]

Re: Flying Scott question

I found some older pictures that I had. Thanks for looking.

 

[F_R]

Re: Flying Scott question

I agree that it is a 1962. The book that I have says it has the inspection cover, but since it doesn't, I don't know what to tell you. It might have a disconnect that you can see if you unbolt the lower unit and drop it down a bit. That is only a guess.

 

[FillupD]

Re: Flying Scott question

OK, I'll get it unbolted a take a look. I have a question about the carbs also that you may be able to help with. There is gas (at times) that shoots out a hole on the top side of the carbs. Is this a stuck needle or something? It is running rough now but I should probably worry about the impeller first.
I'm just confused about fuel shooting out the hole in the carburetor.

 

[corm]

Re: Flying Scott question

Hi,

McCulloch had a service bulletin that said to run them at 50-1 oil mix.
Drop the LU and you will see the brass shift coupler. It has a upper and lower screw, I like to remove the upper one. Either will work.
Put the black tape under the water pump base when you reassemble it.
You may have a bad needle and or seat in the carb. Maybe it just has something stuck in it. If you have the nylon needles you may have to try and find the steel neoprene rubber tipped ones to get it to seal well. They may be hard to find. Watch out for the little spring with the pin in it. They seem to like the floor.
I love to see the old Scott's out there running. Good luck!

 

[FillupD]

Re: Flying Scott question

Thanks for the advice. I'm really getting excited about getting this motor humming especially with the great help from people like you guys on this forum.
I know about things that disappear when they hit the floor, sometimes I look at my Husky and swear he just ate it!

 

[FillupD]

Re: Flying Scott question

Just wanted to say Thanks for the links to the Scott Guy.

You guys are correct, that is a very good source for these motors. Looks like he will be able to set me up with some needed parts and at a reasonable cost too boot!
I got my carbs rebuilt and I was very careful with the little parts. I got my bench cleaned off real well after I thought I had lost a needle and spring. After looking/cleaning, I was putting my other parts away and there it was, stuck to the little magnetic screw on the bottom of the float. Yahoo!
I found my parts and got a clean work bench at the same time.
Carbs look good, I took a little Mothers polish to the bowls, Cool.

Sorry about rambling on, I just wanted to say Thanks; and let the members realize how much I appreciated to be able to come here and get opinions, parts, great advice, and support.
I truly believe with out these forums and iboats services, I would not be as involved or enthusiastic about boating.