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DN
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PostPosted: Sun Nov 04, 2007 3:55 pm    Post subject: Newbie Ignortant Question Reply with quote

I feel like a complete moron but I need someone to help me Embarassed Laughing. I am building my first engine and am assembling the rotating assembly first so I can send it out to be balanced. My question is this:

What do you use to hold the crank while torquing the rod bolts?????

I'm assuming this is just so bloody simple its crazy 'cuz everyone has to do this. I have no one around me so you guys are my only hope!(John Muir's manual says to have a friend hold the crank)

Thanks!!!!!!
DN
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Eaallred
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PostPosted: Sun Nov 04, 2007 4:14 pm    Post subject: Reply with quote

You can weld a gland nut to a piece of angle iron so that you have something you can hold in the vice while you work on the crank.

I always just set the crank in the flywheel on the bench and it holds it just fine.
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bugninva
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PostPosted: Sun Nov 04, 2007 4:16 pm    Post subject: Reply with quote

Eaallred wrote:

I always just set the crank in the flywheel on the bench and it holds it just fine.

i do the same...
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Eric_S
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PostPosted: Sun Nov 04, 2007 4:18 pm    Post subject: Reply with quote

If you don't have an engine stand, loosely bolt the flywheel onto the crank ant stand it on end on the flywheel. I welded an old gland nut onto a piece of pipe that goes into my engine stand.

BTW: Don't assemble anything but the crank, gear, spacer and slinger when sending it out. Balancing is done component by component - individually pistons (I don't send the rings), rods (no bearings), crank assembly (crank, gear, spacer and slinger), flywheel and gland nut), pressure plate (and bolts) and pulley (with bolt). They will bolt whatever together if they need to.

This is a lot of on and off with the gear so you can get the #3 bearing on and off. I just leave the #3 bearing off during preliminary mock-ups until the final mock=up to be sure all spins freely. Then I use a fresh set of bearings for the build. Be sure to mark (scratch or dimple, ink wipes off) the gear and spacer so you get them back on the same way.
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DN
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PostPosted: Sun Nov 04, 2007 5:40 pm    Post subject: Reply with quote

Eaallred wrote:
I always just set the crank in the flywheel on the bench and it holds it just fine.


That figures! I'm trying to figure it out in my head before I do anything and the answer is so simple!! Nothing beats experience Wink


Eric_S wrote:
BTW: Don't assemble anything but the crank, gear, spacer and slinger when sending it out. Balancing is done component by component - individually pistons (I don't send the rings), rods (no bearings), crank assembly (crank, gear, spacer and slinger), flywheel and gland nut), pressure plate (and bolts) and pulley (with bolt). They will bolt whatever together if they need to.

Thats great!! So whats the difference between "static" and "dynamic" balancing? I had in my head that "static" was just individual weights, whereas "dynamic" was the combined weights put into motion.(there by seeing which components weights balanced out others)

Thanks so much guys!!!!
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Eric_S
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PostPosted: Sun Nov 04, 2007 6:20 pm    Post subject: Reply with quote

You are correct about the balance. Static means not changing (not moving), dynamic means changing (moving).

Generally, the rotating (crank assembly) parts are dynamically balanced while reciprocating parts (rods, pistons) are statically balanced.

BTW: The only ignorant question is the one that doesn't get asked. Wink
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DN
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PostPosted: Sun Nov 04, 2007 6:52 pm    Post subject: Reply with quote

that makes sense, thanks for explaining it!!
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Nater
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PostPosted: Sun Nov 04, 2007 7:23 pm    Post subject: Reply with quote

Eric_S wrote:
If you don't have an engine stand, loosely bolt the flywheel onto the crank ant stand it on end on the flywheel. I welded an old gland nut onto a piece of pipe that goes into my engine stand.

BTW: Don't assemble anything but the crank, gear, spacer and slinger when sending it out. Balancing is done component by component - individually pistons (I don't send the rings), rods (no bearings), crank assembly (crank, gear, spacer and slinger), flywheel and gland nut), pressure plate (and bolts) and pulley (with bolt). They will bolt whatever together if they need to.

This is a lot of on and off with the gear so you can get the #3 bearing on and off. I just leave the #3 bearing off during preliminary mock-ups until the final mock=up to be sure all spins freely. Then I use a fresh set of bearings for the build. Be sure to mark (scratch or dimple, ink wipes off) the gear and spacer so you get them back on the same way.



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Kman07
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PostPosted: Sun Nov 04, 2007 7:25 pm    Post subject: Reply with quote

I don't..Im too lazy Rolling Eyes Very Happy
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jeff denham
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PostPosted: Sun Nov 04, 2007 9:03 pm    Post subject: Reply with quote

always remember cap and long end bearing tangs DOWN. JD.
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