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need a balancing gear for 336 crankshaft


 
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Jim In NY
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Joined: 19 Feb 2010
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Location: Penn Yan, NY

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PostPosted: Sat Jan 12, 2013 7:43 am    Post subject: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

anyone know where someone can acquire a welded on type balancing gear for a 870 with a 336 engine ? Thanks
 
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Adirondack case guy
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Joined: 04 Mar 2010
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PostPosted: Sat Jan 12, 2013 3:15 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

To my knoledge the gear was never offered seperatly. Had to order a complete crank assy. The later engines had a two gear balancer in them and the gear was bolted to the crank with taper head internal hex capscrews. A real good machine shop, with a lot of "know how" may be able to reweld it to the crank. If there is worn or chipped teeth, it might be posible to reposition it like some people do with starter ringears, BUT said machine shop will have to have the gear teeth precisely timed, before rewelding, and then rebalance the crank after welding, and then there is always the lingering the issue of worn teeth, and heat stress. As you saw, when you posted about needing a rod, there is a lot more variables than one would think in a 336 Case engine.
You can eliminate the 3 gear balancer, and mount an oil pump out of a 6cyl engine on a proper sized 6cyl front main bearing cap, (big journal/little journal) but again this is a machineshop operation, and requires proper shimes to space the pump drive gear from the crank drive gear and an oil feed line from the new pump to the block where the balancer pump fed the block.
Loren
 
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Adirondack case guy
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PostPosted: Sat Jan 12, 2013 3:32 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

PS, you will also have to fab up a new oil pickup screen assy with the front pump. You might be able to match up some of these parts from Case construction 336s, but I think journal size will haunt you, as far as the front main is conserned.
Loren
 
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Thad
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PostPosted: Sat Jan 12, 2013 3:49 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

I had a source that did have them seperate from the new cranks. Im not sure if they still have them or not. It would be monday before i could check and yes its a weld on gear. Thad
 
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1370rod
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PostPosted: Sat Jan 12, 2013 4:27 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

Loren, I missed placed a question the other day regarding these engines. Do you or anyone out there know of any reason why CASE decided to Turbo the small journal 336? Rod.
 
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Case Nutty 1660
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PostPosted: Sat Jan 12, 2013 5:42 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

Rod, this is just a guess but I ran several W-14 loaders and they seem to rap faster than the big crank 870's do also they turned them higher RPM's so less rotating mass at those higher speeds may turn out more HP, less torque but with the turbo and or like in the W-14 a torque converter those industrial engines do not need extra torque and may just work better with the small journals ,,, make any sence to you? just me thinking
 
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PostPosted: Sat Jan 12, 2013 7:18 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

Rod, Reduced spinning mass, thus snappier engine.
Loren
 
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1370rod
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PostPosted: Sat Jan 12, 2013 8:53 pm    Post subject: Re: need a balancing gear for 336 crankshaft Reply to specific post Reply with quote

Thats the one angle I never thought of, it makes sense, thanks guys. Rod.
 
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