Can someone explain this engine blueprint to me?

drafted72(Chicago)April 20, 2012

I am interest in the shaft. I do not understand what is the measures on the top (next to the motor) 0.1.26 [032]. Is it a staight 1" shaft or is the top wider ??

http://www.smallenginesuppliers.com/html/engine-specs/line_drawings/386777.pdf

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baymee(LehighValleyPA)

Looks like .986 (1 inch) for the pulley and 1.25 for the crankshaft end.

    Bookmark   April 20, 2012 at 2:02PM
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drafted72(Chicago)

Thanks but I do not understand what you mean. So the shaft is not 1" top to bottom??

    Bookmark   April 20, 2012 at 2:08PM
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larso1(So. CO Zone 5)

The bottom of the keyway is 0.986-in. max/0.976-in. min. to O.D. of the shaft; the O.D of the shaft is 1.125-in. max./1.124-in. min.; the part of the shaft that enters the block is shown as a nominal 1.26-in. O.D. with a small undefined radius between the two O.D.s next to the face of the block (no tolerance due possibly to the manufacturer's proprietary concerns, or maybe because it isn't important to the regular consumer).

    Bookmark   April 20, 2012 at 5:29PM
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rustyj14(W/PA)

Does this person think that the crankshaft goes straight thru the block and comes out the other side-ala a straight shaft with no way to make the piston go up and down?

    Bookmark   April 20, 2012 at 8:29PM
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drafted72(Chicago)

"Does this person think that the crankshaft goes straight thru the block and comes out the other side-ala a straight shaft with no way to make the piston go up and down?"

Rustyj14
No smart ass, I was referring the part of the crankshaft which is outside of the main body of the engine. I should of made it really simple for a smart ass like you.

    Bookmark   April 20, 2012 at 9:41PM
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drafted72(Chicago)

Thank you larso1 for your explanations

    Bookmark   April 20, 2012 at 10:03PM
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ggoyeneche

Rusty is real cute. He's such a comedian. But tweak him, and you'll find out what a thin skin he has. Best to just ignore him.

Anyway, the 0024 Crank Extension is 1-1/8" x 3-5/32 (from the mounting datum).

The 0036 Crank Extension is 1" x 3-5/32.

In both cases there is a larger 1-1/4 diameter shoulder on the crankshaft approximately 3/4" before stepping down to the 1-1/8 or 1" dimension. If you order from Small Engine Suppliers be sure to tell them which crank extension you want, so you can match up properly with your existing pulleys and/or electric clutch.

    Bookmark   April 20, 2012 at 10:16PM
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baymee(LehighValleyPA)

It's reduced to approx. 1" for a pulley, but it's thicker where it goes through the bearing for crankshaft strength. It probably stays 1.25 all the way to the crank's flywheels.

    Bookmark   April 20, 2012 at 10:47PM
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larso1(So. CO Zone 5)

No, it's a 1 1/8-in. dia. shaft from the outer (tapped) end to the block face, where it increases to a nominal 1 1/4' dia. at the outboard bearing of the block. It's quite clear the 1-in. dimension is the bottom of the keyway to the outside diameter of the shaft. At least it's clear to me...

    Bookmark   April 21, 2012 at 12:07AM
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baymee(LehighValleyPA)

I stand corrected. I'm glad I didn't order the pulley yet. :)

    Bookmark   April 21, 2012 at 5:16AM
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