Author Topic: Stihl MS291 (2014) Rebuild  (Read 497 times)

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Offline jmester

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Re: Stihl MS291 (2014) Rebuild
« Reply #10 on: April 23, 2018, 06:15:15 am »
Here is a thread on the mighty vac that can be used for pressure and vac testing. If you hunt around on the internet you should be able to find one pretty cheap. https://chainsawrepair.createaforum.com/stickys-of-how-to-basics/pressure-testing/

Make sure you use some dirko on the engine pan and around the seals before you do final assembly also make sure you oil the piston pin and pin bearing also the piston rings and cylinder walls. I use 2stroke engine oil.
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Offline BlackPlague

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Re: Stihl MS291 (2014) Rebuild
« Reply #11 on: April 23, 2018, 11:03:13 am »
Thanks for the suggestions.

I did oil the piston, pin, bearing, rings and cylinder walls with 2 stroke engine oil, so I got that right at least.

I did not buy Dirko, but used Permatex Motoseal (https://www.napaonline.com/en/p/BK_29132).

I also did not put the gasket maker around the oil seals, as the service manual stated not to. I'm hoping I won't regret that, as you and others have suggested to go ahead and do that.

Offline jmester

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Re: Stihl MS291 (2014) Rebuild
« Reply #12 on: April 23, 2018, 07:35:14 pm »
I think what you used will work just fine. It looks like you have the soft oil seals hopefully they will seal. Only time and a pressure and vac test will let you know. I would recommend that you do a pressure and vac test before you install the flywheel or clutch as it is easier to see the pan seal surface and the oil seals. I think you have done a good job so far.
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Offline BlackPlague

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Re: Stihl MS291 (2014) Rebuild
« Reply #13 on: April 29, 2018, 05:42:40 pm »
Just wanted to finish this thread up by saying thank you to those who took the time to respond.

I finished the rebuild today and everything seems to have gone well. Pressure and vacuum leak down tests were good, and compression was around 150psi.

Engine is idling and revving well. Chain brake working as expected and chain is getting oil.

Thanks again!
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Offline jmester

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Re: Stihl MS291 (2014) Rebuild
« Reply #14 on: April 29, 2018, 10:53:51 pm »
Glad it worked all worked and went well.
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