I've seen on Aliexpress that a complete engine for the Stihl MS180 sells for about $27, which bring it back to my first question - if any member of the forum ever tried it? you've mentioned that you have several saw of this model in your barn, so I guess that you use them more intensively, as I wrote - I only use it every once in a while, so maybe it's worth to fix.
Replacement engine for Stihl MS180
- Thread starter Koper
- Start date
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I didn't took it apart yet, so I couldn't try to turn the flywheel, but even without the spark plug - it doesn't move by pulling the cord starter.
Michael E
ArboristSite Member
Which could still be simply a broken starter assembly.
LarJea
ArboristSite Lurker
I noticed a seller on ebay also had a complete 180 engine with crank and free shipping from the USA with 2 year warranty for $32.
I've seen (if I'm not mistaking) that there are two versions of the MS180 engine, one with 8 mm pin and the newer version with 10 mm pin. are the two versions interchangeable? I guess that mine chainsaw is the older version, so if I'll have to purchase a new engine and it will be of the new version - will it still fit? and if you can enlighten my eyes on which pin we are talking about?
Each takes their on crankshaft.
Sorry, could you elaborate?
The 8mm bearing will only fit the end of the crankshaft for that size and the same for the 10mm bearing. This is where the piston attaches on to the crankshaft. Check pistons for those and it will say either 8 mm or 10 mm rod for the piston. This is a 10mm and will only use a 10mm piston. On the very tip end is the 10mm where the piston goes. You can swap the crankshafts and use either.
https://www.ebay.com/itm/322378703046?_skw=10mm+180+crankshaft&itmmeta=01JHZGBG43W5PVY4N7PBJ7WFA8&hash=item4b0f44a0c6:g
H0AAOSwsA5a1WOf&itmprp=enc:AQAJAAAA0HoV3kP08IDx+KZ9MfhVJKkiwnkxopxuNaFRJ--5m0TTpbpE7yp8sZyew5rhurF+RX06O937anehyq/Y9nI5RKko9+FirMZx/c58Tv87CqsEudpHaAXYHELfqMbnv/O66MRHT96Jr/fLKdzL1peU3P06m94hbqzFIrsBeMnVqwb2Mh6214eR1YDha6P/rVvXeMHW117cn8tVAlz7ropUsKxiIk2mx/c54H9yNNshsn4DJet9W0nX0YmUBFSvbwE+Yt4lf/N1JWQ03d20eYD7lSo=|tkp:Bk9SR6aCrvCPZQ
Michael E
ArboristSite Member
The "pin" goes through the piston, there are holes on both sides to slide it through. In the middle, the pin goes through the needle bearing of the connecting rod (on the left side of the photo). The connecting rod is fixed to the crankshaft (it's not individually replaceable). The diameter of the pin determines the kind of piston and the matching connecting rod, and thereby the connected crankshaft.
Concerning your question: If you only want to replace the piston, you have to make sure you buy one for the correct pin size. If you want to replace the complete engine, it doesn't matter. The ends of the crankshafts are identical, everything will bolt right on.
Concerning your question: If you only want to replace the piston, you have to make sure you buy one for the correct pin size. If you want to replace the complete engine, it doesn't matter. The ends of the crankshafts are identical, everything will bolt right on.
Thank you and thanks to jitrent for the comprehensive reply. if I get it right, it is what is called "gudgeon pin" a term that I know from vehicle engines.
Michael E
ArboristSite Member
Had to google it - yes.
