Troubleshooting and finally fixing a Yanmar 2gm20 marine diesel engine. Removal of Cylinder head, valve lapping, re-assembly and some oil pipe improvisation. I looked for videos of people disassembling the gm’s before I attempted this but could not find any. Perhaps this will better inform you what to expect if you are thinking about doing the same. Things learnt – Check mixer elbow every season. Check the oil pipe that runs hidden, behind the engine and before it spews all your oil into the bilge on passage one day!
I’d add, I’m an DIY guy, not a professional mechanic. I didn’t find this too hard and managed to expand my tool-kit, probably for less than it’d have costed to get the local mechanic to step on-board. If you have the confidence to do the same, I’m sure you’d find it as rewarding as I did, though obviously at your own risk! 🙂