O.S. LA 40 Help .....

WV. FLYGUY Mon Jan 01, 2018 6:10 pm

Well its about 3 degrees here and snow and and was getting a little bored so I started putting my O.S. LA 40 back together after a lenghty cleaning and lubrication that I started several weeks ago. Now for the dumb question here. And I should be smarter than this but..... I did not remember how I took the piston sleeve out and am trying to figure out where the ports are supposed to be positioned as I put in back into the cylinder. I took several pictures for the experts here. I always work on the little Cox engines and pretty well know them but this one is a little new to me. Thanks for your help forum. You guys are great here.

Jason_WI Mon Jan 01, 2018 6:32 pm

I thought the sleeve lined up with the alignment pin on the top center rear of the crankcase. Also the con rod beveled edge goes towards the crank web. Not sure but on some OS engines the piston has a direction too. I always mark the piston exhaust side before tearing apart.

NEW222 Mon Jan 01, 2018 6:35 pm

Is there not a little 'pin' sticking up on the case and or a notch in the piston liner to line them up? Its been a while since I rebuilt an LA 40 that I used to have.

WV. FLYGUY Mon Jan 01, 2018 7:22 pm

Jason_WI wrote:I thought the sleeve lined up with the alignment pin on the top center rear of the crankcase. Also the con rod beveled edge goes towards the crank web. Not sure but on some OS engines the piston has a direction too. I always mark the piston exhaust side before tearing apart.

Well you are correct. There is a dot in the rear of the sleeve that lines up with a dot on the cylinder. Got it. Works perfect. Thanks a bunch .

WV. FLYGUY Mon Jan 01, 2018 7:22 pm

NEW222 wrote:Is there not a little 'pin' sticking up on the case and or a notch in the piston liner to line them up? Its been a while since I rebuilt an LA 40 that I used to have.

Well you are correct. There is a dot in the rear of the sleeve that lines up with a dot on the cylinder. Got it. Works perfect. Thanks a bunch .

NEW222 Tue Jan 02, 2018 5:10 pm

Jason_WI wrote:I thought the sleeve lined up with the alignment pin on the top center rear of the crankcase. Also the con rod beveled edge goes towards the crank web. Not sure but on some OS engines the piston has a direction too. I always mark the piston exhaust side before tearing apart.

Thanks Jason. I am a slow thinker and typer, and must have been typing while you replied. But, it is good knowing I at least remembered something from rebuilding an engine.... Very Happy

Jason_WI Tue Jan 02, 2018 5:42 pm

I have that happen to me sometimes while I'm typing up a reply and hit send and then see a response beat me by a minute or two.

Beers

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O.S. LA 40 Help .....

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