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Junkyard engine identification


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#1 justwalt OFFLINE  

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Posted October 26, 2010 - 09:26 PM

Here's an engine that I picked up yesterday at my favorite junkyard.

It was stripped, no carb, no mag, no head and sheet metal, but I did
find a starter generator with it.

I think it's a 16 HP I/C briggs... bore is 3.5" with a 3.25" stroke... 3l.2 CU.IN.

I've seen these with a single external counter weight before, but this engine
has two... one on each side.

It turns very smooth, cylinder looks great and no cracks... just some excess
end play in the crank.
Of course, no numbers anywhere, not even under the flywheel.

I'm wanting to gather parts to eventually restore it to running condition.

100_0948.jpg on the crank.


Any ideas....anybody??

thanks


walt

Attached Thumbnails

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  • 100_0937.jpg
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#2 olcowhand ONLINE  

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Posted October 26, 2010 - 09:42 PM

Might be a 320424, but I can't find my spec sheet for bore/stroke to verify. If it is a 320424, then it's 14hp. Looks just like my engine on my Bush Hog JBI I recently bought.

#3 ducky OFFLINE  

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Posted October 26, 2010 - 10:09 PM

Whoo, What's all that gearing about just to drive a cam. Balance Shaft? Is there another drive shaft I am missing?

#4 justwalt OFFLINE  

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Posted October 26, 2010 - 10:20 PM

So far, all I've found is, the cast iron L-heads of the 320000 models had a 3.5615- 3.5825 bore.
The 230000's have a bore of 2.999-3.000, and the 240000's are 3.0615-3.0625

That's all I've seen for bore sizes.

These two gear covers have a tiny bolt which is removed, and a pin inserted to lock the balancer gear
in place when reassembling... but I don't know where the crank is set to... maybe TDC.

thanks... so far
the answers will come

walt

#5 justwalt OFFLINE  

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Posted October 26, 2010 - 10:28 PM

Ducky... the gears are identical on both sides, which looks like maybe two cams, or
they share the same shaft. The flywheel side had a standard shaft end, stubby. The
drive side had a 4-gang pulley, 3 different sizes.

I thought I read that even way back then briggs had the I/C class engines.

I'll take the pan off tomorrow and see what the cam shaft looks like.

#6 justwalt OFFLINE  

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Posted October 27, 2010 - 09:08 AM

The junkyard engine is a synchro balanced model... here's an exploded view of one...
model 300421

http://www.partsands...s/300421.01.gif

Takes a standard head and external coil, looks easy, and, I found the steps to
time the counterweights with the crank.

check out the site where I found it

And now I see it was offered in the B-12 models..


A completely new engine designed for use with the B-12 tractor. Manufacturer's ratings - 12-hp at 3300 rpm; 3-7/16" bore; 3-1/4" stroke; 30.16 cubic inch displacement.

The same quality features are utilized in the new 300421 engine plus an exclusive breakthrough in single cylinder engine design.

A Synchro-Balanced Crankshaft: Synchro-Balance is the tradename Briggs & Stratton uses for dynamic balancing. This is accomplished by gear driven counterweights on the outer sides of both the engine main bearings. These counterweights rotate opposite the direction of the crankshaft static weights. The result is smooth engine performance with 60% less vertical vibration and 85% less horizontal vibration.

An excellent demonstration of this new smoothness is to place a coin on the hood of the Bi12 tractor. Run the engine at full rpm. The coin will dance on units not using the Synchro-Balance engines while only sliding slightly on the new 12-hp engine.


[Source: Allis-Chalmers Outdoor Power Equipment, Dealer Product Information, OPE-2008, Jan 67, courtesy of Del Allen]

Attached Thumbnails

  • 300400.jpg

Edited by justwalt, October 27, 2010 - 11:04 AM.


#7 NUTNDUN OFFLINE  

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Posted October 27, 2010 - 05:54 PM

It would be really great to get her running again. Sounds like you have a good base to work with.

#8 justwalt OFFLINE  

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Posted October 27, 2010 - 09:56 PM

Got her cleaned and oiled for temporary storage. Insides looks good.
Parts, gaskets and seals are available. Gotta check the bore for wear
before ordering parts. I'll probably have it bored and get a piston set anyway.

A lucky find indeed, especially at 30 cents a pound.

100_0958.jpg




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