Author Topic: Ms 290/310/390 crank seals  (Read 627 times)

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Offline 660magnum

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Re: Ms 290/310/390 crank seals
« Reply #10 on: July 15, 2014, 12:27:28 am »
I don't know much about a MS290/MS390 except that it is a clamshell design.

But I have some of the 025/MS250 clamshells and the seal cavity has a slight outer lip. There is no way to successfully remove and install the seals without removing the engine from the frame and pulling the pan from the bottom of the engine.
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Offline bustedknuckles

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Re: Ms 290/310/390 crank seals
« Reply #11 on: July 16, 2014, 08:03:38 pm »
The MS250, although in a different family is very similar in construction to the 1127 series. I just assembled an MS250 a few days ago. Haven't run it in wood yet. I agree that it would be difficult to change a seal without having the pan off and the pan can't come off without removing the engine and the engine can't come out without taking just about every other nut, bolt and screw on the saw apart. These clamshell saws are challenging to disassemble and assemble but the engines are robust and they'll last a long time if cared for. About the time one gets off the bench there are others in line.

 

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