Hello. I'm looking for some help with an issue I'm having with my ZD331 (D1305 diesel engine). The mower was running fine the last time I had it out in early August, but it hasn't gotten a lot of use this year due to a lack of rain. I went to try and start it last week and the starter was just clicking. Got it to turn over, but it didn't seem to be turning over well and it didn't seem to be trying to fire. I figured maybe the battery just needed a charge, so I stopped cranking it to charge the battery. While the battery was charging, I pulled and disassembled the starter so I could chuck the rotor up in the lathe to clean up the armature. Didn't turn any material off, just used some fine sanding cloth while spinning to clean the copper up. Reassembled, tested and put it back in the mower and tried to start it. Engine turned over a little bit and then just stopped turning. Tried turning the flywheel by hand the opposite direction. Flywheel will spin roughly half a revolution and then it stops and refuses to move any further. Turning it back the other direction, it spins roughly half a revolution and then stops and refuses to move any further. Moderate effort trying to turn it did not make it spin, so I stopped and didn't try to make it turn further.
Things I have tried so far that have not resolved the issue:
1. Pulled glow plugs in case it was somehow hydrolocked.
2. Disconnected drive shaft to hydraulic pump in case the hydraulic pump wasn't turning.
3. Pulled fuel injector pump assembly in case something in there was seized up.
4. Pulled valve cover to check valve train. All appeared okay, so pulled rocker arm assembly in case a valve was somehow stuck, still no go.
Is there anything else I should check before just pulling the engine and starting to tear it down to find the issue? Any place in particular to look first if I have to start tearing down the engine? I don't want to tear it down any further than necessary.
The engine has 395 hours on it.
At this point in the season, this will likely be added to my list of winter projects.
Thanks in advance for any help!
Things I have tried so far that have not resolved the issue:
1. Pulled glow plugs in case it was somehow hydrolocked.
2. Disconnected drive shaft to hydraulic pump in case the hydraulic pump wasn't turning.
3. Pulled fuel injector pump assembly in case something in there was seized up.
4. Pulled valve cover to check valve train. All appeared okay, so pulled rocker arm assembly in case a valve was somehow stuck, still no go.
Is there anything else I should check before just pulling the engine and starting to tear it down to find the issue? Any place in particular to look first if I have to start tearing down the engine? I don't want to tear it down any further than necessary.
The engine has 395 hours on it.
At this point in the season, this will likely be added to my list of winter projects.
Thanks in advance for any help!