1973 Sears (Tecumseh)

[DocRay]

On a Sears metal nameplate:
Chassis Number:
217-5854-3 (Says to use when ordering parts)
Serial Number: 3B 104466

And just under the gas tank up top:
T-642-16A
TECUMSEH
6958125

24:1 gasil ratio from what I'm told. I'm wondering where to buy parts, particularly a coil. Also, what oil should I use? I'm told not to use the new type of 2-cycle as it burns too hot and will damage the engine. Problem is I'm not sure how to tell the difference, another guy says to use "chainsaw oil". I bought some "2-cycle oil for air cooled engines" which lists chainsaws on the back as a recommended application but I'm not really sure how to tell "old" from "new" 2-cycle oil.

Also need a new assembly that tightens onto the transom, the parts diagrams on Sears' website suck but I think it's called "stud and bracket assembly", does this sound correct?

Thanks in advance!

Jacob

 

[steelespike]

Re: 1973 Sears (Tecumseh)

motor instructions say use outboard oil. 73 use 24:1. 74 newer using TCW rated oil 32:1 You can use any good quality 2 stroke oil. TCW3 (On the label)rated outboard oil will work fine.Besides the coil and clamp you will probably need a pump for the water cooled leg.
You can find part numbers at sears.Certified parts corp or Discount Marine may have parts.The motor Is Eska built using a Tecumseh air cooled power head with a water cooled leg.Been out of production for about 25 years
Noisy,vibrate,and can be unreliable.
If the motor has been a loyal pal for years and you love it fix her up.
If its been sitting in uncle Neds shed for 20 years I feel you would be better off selling and put put the money and that you would spend on parts towards a Evinrude/Johnson 3,4,5,5.5,6,7.5 hp from the early 50s to the 80s.
These are twins,smooth,relatively quiet,reliable,easy to work on.
They have a vast supply of new and used parts from dozens of venders and BRP dealer nation wide.

 

[DocRay]

Re: 1973 Sears (Tecumseh)

This motor actually does NOT have a water pump for the water cooled leg.
Needs to be in motion and water is forced up into the leg in some matter.
I got it running very well in a garbage can full of water but the darn thing got way hotter than it should. Anything submerged was fine but the rest was too hot.

Makes perfect sense seeing as the motor isn't having water forced into it.

Hope this helps someone else!

 

[jhnwits me]

Re: 1973 Sears (Tecumseh)

where can i order parts at i hav the exach same motor

 

[DocRay]

Re: 1973 Sears (Tecumseh)

where can i order parts at i hav the exach same motor

It may not be exact, apparently some 1973s had water pumps and some didn't. Mine just happens not to have it.

Google Certified Parts Corporation, they were very helpful and pointed me to someone who could answer my question for sure. Look for Jele3 Marine Store on Ebay, contact that person if you have any questions. I just bought some parts from him he's been VERY helpful. Otherwise Certified Parts should have most anything you need.