Author Topic: 394 crank bearings and seals, oem or aftermarket?  (Read 512 times)

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Offline alsled

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #10 on: November 10, 2013, 04:22:02 pm »
Anybody know the seal part number other then oem, like a manufacturer of the seal part number?

Offline 660magnum

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #11 on: November 10, 2013, 04:34:25 pm »
I googled all around and didn't come up with a CR #
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Offline alsled

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #12 on: November 10, 2013, 04:35:49 pm »
Me neither.

Offline KilliansRedLeo

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #13 on: November 10, 2013, 04:47:56 pm »
OEM seals 503 26 02-05
OEM bearings 503 25 00-02 BALL BEARING 6203C3QE6 replaced by 738 22 03-25

Seals from HLSProParts
Product Code: H29288
Bearings from HLS
Product Code: H32288

The 394 288 and 281 all use the same bearings and seals.
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Offline mdavlee .

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #14 on: November 10, 2013, 08:26:29 pm »
Here you go if you're going aftermarket. http://www.weedeaterman.com/product_p/o503473701.htm

Offline sharkey

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #15 on: November 10, 2013, 11:30:07 pm »
What's wrong with the plastic cage? That's what most OEM bearings are using now. The stihl 460 bearings I just installed had plastic cages.
I realize in some applications your stuck with the oem bearing.  The problem with the nylon caged bearing is it isnt as strong as the metal caged bearing.

Offline 660magnum

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #16 on: November 11, 2013, 01:38:18 am »
The polyamide caged bearing is considered superior for high speed use.

Some people's theory was that the plastic cage would cause no harm to the piston/cylinder.

My experience is that when the cage goes, the rod hits in the bottom of the case when the balls all get on one side and metal gets up on top of the piston anyway.
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Offline KilliansRedLeo

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #17 on: November 11, 2013, 08:39:54 am »
The polyamide caged bearing is considered superior for high speed use.

Some people's theory was that the plastic cage would cause no harm to the piston/cylinder.

My experience is that when the cage goes, the rod hits in the bottom of the case when the balls all get on one side and metal gets up on top of the piston anyway.

+1 660 couldn't have said it better or been more correct!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline KilliansRedLeo

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Re: 394 crank bearings and seals, oem or aftermarket?
« Reply #18 on: November 11, 2013, 09:19:48 am »
When replacing crank bearings, you DO NOT put the bearings on the crank and pull it into the case! Bearing fitment to the case is an interference fit, to do it without using heat will gall the bearing cups and ruin the case! You heat the case in the oven or with a heat gun and tap the case on a block of wood, the old bearings will drop out. You then reheat the case and drop a new bearing that has been in the freezer overnight into the case.

You then use the crankshaft assembly tool to pull the crank into the clutch side of the case, then install the gasket and pull the crank and clutch side of the case into the flywheel side using the opposite side of the assembly tool. There are two large threaded counter bored bolts each tapped for the clutch and flywheel side of the crank.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

 

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