Greetings Timon,
Welcome to the ODK Forums. We're pretty much a crew of tinkerers here, who like the challenge of fixing things, rather than discarding them.
I can't find any downloadable [free or paid] Service Manuals for this old model, so I'd say a print copy is the only option. They are available on Amazon and eBay US, but shipping is going to make them quite exy.
The online parts lists for the GV150 do show a crankshaft thrust washer, FWIW.
