1967 Sportwin 9722B minor overhaul

[fxb1982]

Greetings to all,

I plan to do a minor overhaul on this motor. It appears to have seen light use and is in above average condition for a 42 year old motor. I have no idea when the motor was last run. I applied tcw3 oil to the cylinders and let it soak. The engine turns over freely and smoothly. I am going to perform a compression check later this week.

I have a carburetor rebuild kit, new ignition parts, fuel pump, impeller, and a head gasket as well as all required tools to remove the flywheel along with a copy of the original Evinrude service manual particular to this model. I have read the "Awakening a Sleeping Outboard ?FAQ? as a guide to aid in the overhaul.

I have done an overhaul like this on a 1960 Johnson 5.5 HP CD-17 which had been "asleep" for 20+ years with good results.


I have a few questions:

1. Does impeller replacement require power head removal?

2. Is the flywheel nut left loose, right tight?

3. Should I remove the cylinder head and replace the original gasket?

4. Is there an easy way of inspecting the exhaust housing seal in the lower unit?

5. Are there any additional recommendations concerning this project?


I am sure additional questions will arise as I go along. I appreciate being a member of this forum and look forward to any questions, suggestions and comments.

Thank you, I hope everyone is having a good weekend.

BJ

 

[ezeke]

Re: 1967 Sportwin 9722B minor overhaul

"1. Does impeller replacement require power head removal?"

No

"2. Is the flywheel nut left loose, right tight?"

Yes

"3. Should I remove the cylinder head and replace the original gasket?"

No, unless the compression test turns out bad. You could retorque the cylinder head bolts to 96-120 inch pounds.

4. Is there an easy way of inspecting the exhaust housing seal in the lower unit?

The "exhaust housing seal" is the large rubber seal between the inner and outer sections of the exhaust housing. To actually work on it you have to remove/disassemble the outer exhaust cover which is major work.

5. Are there any additional recommendations concerning this project?

Rebuild the carburetor with a complete kit with new float. Take care to add the clip between the float arm and the new needle. Follow Mr. Reeves' suggestions in the Engine FAQ Forum to reset the idle needle.

I think that the motor picture belongs to Iwombat.

 

[Rick.]

Re: 1967 Sportwin 9722B minor overhaul

Hi there.
1. no, removal of shift linkage bolt.
2. yes, leave it on while pulling the flywheel. Loosen it to the last couple of threads. Be prepared, sometimes they take excessive torque to remove.
3. I wouldn't unless your not getting a good compression reading. Then I would but also resurface the head before re-installing.
5. Oh Boy. How much of a perfectionist are you? There are so many things you can remove and clean and re-grease. I would suggest you remove the magneto completely (four more screw) and clean it all with paint thinner (my go to cleaner for most motor stuff). then re-grease it and put it all back together with all your new electrics. It will just throttle so much smoother you'll be happy you did it. It is in the manual. Change the leg oil, remove and clean and re-grease the prop shaft.

All the parts you got are the ones I would recommend. Depending on condition, you will probably need new coils but wait and see. Best of luck and don't be afraid to ask. 9.5's are almost identical from 65 to 73 so use the link below for parts diagrams. You can use any available year.
http://shop2.evinrude.com/ext/index.aspx?s1=bf6ad09c53cead335fcfd8a6471c0f7f

Edit; I would also replace the fuel lines and do a decarb. at the very end, then install new plugs.

 

[fxb1982]

Re: 1967 Sportwin 9722B minor overhaul

Thank you ezeke and Rick.

I will follow your recommendations and let you know how things turn out.

I hope the exhaust housing seal is in the same shape as the exhaust hose which looks to be in good shape. I understand those parts may be difficult to find if they need replacing.

BJ

 

[Rick.]

Re: 1967 Sportwin 9722B minor overhaul

As far as compression goes don't expect it to be very high. Close to sixty a side seems to be the norm. I always check compression before I sped a nickle on parts. Bad compression = decision time for me. 9.5's also have a history of bad motor mounts. Try to rock your power head front to back and see if the play is excessive. Some play is expected. My 9.5 is in very good condition but ....I was running it in a barrel on Saturday and I did notice the RPM's went up once I removed the cowling. I am not too concerned unless it does the same on the lake. With the cowling on there isn't a lot of fresh air ports for the carb. but there has to be enough or Evinrude would have made changes by 73. Have fun. Rick.

 

[iwombat]

Re: 1967 Sportwin 9722B minor overhaul

Those motors never run all that great in a barrel. They just sit too low to get good ventilation. The only true test for an exhaust problem is on the boat. I've been through three of these things now and haven't seen a bad exhaust housing seal yet. A more likely problem is the shift-shaft boot. Both of these are a major job, so be sure you've got a problem before ripping the whole thing apart.

60-80psi with the rope start seems to be pretty standard. You'll get a better test and higher numbers wrapping a rope around the flywheel.

 

[fxb1982]

Re: 1967 Sportwin 9722B minor overhaul

Hello to all!

The compression test came out to be 80 psi per cylinder. The rebuild went well. The motor mounts are fine. This little motor runs like new! Thank you all for your help. Enjoy spring!

BJ

 

[Rick.]

Re: 1967 Sportwin 9722B minor overhaul

I'm always glad to hear someone has a winner. Sounds like you do. All the best with it and thanks for letting us know. Did you do a decarb? Rick.

 

[fxb1982]

Re: 1967 Sportwin 9722B minor overhaul

I haven't done the decarb yet, but will as soon as the weather gets a bit warmer. Thanks again guys!
BJ

 

[fxb1982]

Re: 1967 Sportwin 9722B minor overhaul

I had this motor out on the lake this weekend. I use it on a 12 foot aluminum boat at the cabin. I decarbed it as described in the top secret file. This little boat really scoots as compared to the 5.5 Johnson I used before. The 9.5 starts easy, idles smooth and runs great at full throttle. I?m ready to use it a lot this summer. Thanks again to all!

BJ