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Author Topic: MS390 Crank Bearings  (Read 619 times)

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Offline Jason K

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MS390 Crank Bearings
« on: March 18, 2016, 01:36:06 am »
I got drop off a clean MS290 with bearings and top end shot.. So I am going to make it MS390.. I was wonding what part number for the bearings and seals.. Is there all metal cage that I can replace the cheap plastic ones with.


If please help me out and give me part numbers


Thanks
Jason
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Offline 660magnum

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Re: MS390 Crank Bearings
« Reply #1 on: March 18, 2016, 03:10:23 am »
Stihl 290/310/390  6203 C3 SKF OPEN TYPE BEARING 17X40X12mm   Seals 17 X 30 X 4.4  I level off the bearing cap and the cylinder with some 320 wet or dry paper on a glass pane before reassembly.

Buy a sealed bearing and then carefully remove the existing rubber seals.

The sealed bearing sets are always cheaper than open, mostly due to the fact that sealed is what's produced most.

Stihl Part #9503 003 0310, Generic 6002-C3, size15x32x9

Fits 028 Flywheel side

Stihl Part #9503 003 0340, Generic 6202-C3, size 15x35x11

Fits:
034/036 Flywheel side
038 Flywheel side
O28 Clutch side
044/046 Flywheel side
048 Flywheel side
021
023
025
MS210
MS230
MS250
041
042

Stihl #9503 003 0440 and #9503 003 0443 Generic 6203-C3, size 17x40x12

Fits:
038 clutch side
064/066 Flywheel side
084/088 Flywheel side
029/MS290 both sides

Also fits the following Husky’s
240
245
281
288
385
390
394
395
2100
Also 181 but some have different bearings each side.
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Offline 660magnum

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Re: MS390 Crank Bearings
« Reply #2 on: March 18, 2016, 03:18:38 am »
FWIW the plastic cage (Polymid) bearings are more expensive than the steel cage bearings and are normally considered more desirable for high speed service.

Also if you loose a plastic cage, the engine will lock up but there are a minimum of metal shavings up in the engine. If you loose a metal cage, the metal shavings have been going up through the engine for some time and you will consider the piston/rings gone and sometimes the cylinder too.
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Offline Jason K

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Re: MS390 Crank Bearings
« Reply #3 on: March 18, 2016, 09:02:35 am »
Thanks For the Input. 660..
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