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Tecumseh 2 stroke

#1

S

Sam69

Hi guys. I am new to the forum and have a question regarding Tecumseh TC300 2 cycle engine. Normally on 2 stroke engines there are pins in the ring grooves on the piston to properly locate the ring gaps, but there are none on the TC300. I wondered if the gaps had to be located anywhere in particular in the bore or would it not matter seeing as they are free to rotate. Many thanks for any replies.


#2

M

mechanic mark

http://www.tecumsehpower.com/CustomerService/BSI.pdf


#3

S

Sam69

mechanic mark said:
http://www.tecumsehpower.com/CustomerService/BSI.pdf
Click to expand...

Thanks for the link Mark, although I couldn't find any info regarding ring position it did mention Technical manuals, so I did a search and found one for the TC300.
All this said was to ensure the ring gaps are staggered, I find it quite unusual for a 2 stroke not to have locator pins in the ring groove of the piston.


#4

M

mechanic mark

Sam69 said:
Thanks for the link Mark, although I couldn't find any info regarding ring position it did mention Technical manuals, so I did a search and found one for the TC300.
All this said was to ensure the ring gaps are staggered, I find it quite unusual for a 2 stroke not to have locator pins in the ring groove of the piston.
Click to expand...

Staggered is correct, I've never heard of pins being in ring grooves, by staggering piston rings you will ensure bore to be sealed, not letting oil by.


#5

M

motoman

Sam, What do the pins do?


#6

S

Sam69

motoman said:
Sam, What do the pins do?
Click to expand...

Generally unlike a 4 stroke which doesn't have its exhaust/inlet ports on the cylinder wall, 2 strokes engines tend to have pistons with small pins in the ring groove to locate the piston ring gap in such a way that the open ends cannot rotate and foul on a port in the cylinder, resulting in broken rings. I have attached a link to a photograph of a 2 stroke piston with locating pins.
Scooter Help - Small Frame Piston Install

ring locator pin2.jpg


#7

M

motoman

Sam, Thanks, never heard that before.


#8

J

jp1961

My Intertec manual just has info on the TC200 not the TC300. Just says to stagger the end gaps on the rings. I'd make sure the end gaps aren't in line with any ports, if possible, as stated above. The recommended fuel-oil mix is 24:1 btw.

Jeff


#9

S

Sam69

jp1961 said:
My Intertec manual just has info on the TC200 not the TC300. Just says to stagger the end gaps on the rings. I'd make sure the end gaps aren't in line with any ports, if possible, as stated above. The recommended fuel-oil mix is 24:1 btw.

Jeff
Click to expand...

That's great. Thanks Jeff


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