5000hrs is not major for the Lehman
. Injector service
is the only essential thing to worry about if they have not been looked at in the last 2000hrs.
Probably the cheapest 6cyl motor
to rebuild. The Lehman is a 6D series engine. Oil leaks
around gaskets is their major problem and can make them look worse than they really are. The genuine Lehman water
mainfold tends to rust out at the exhaust end. Apart from that, the only other issue is the power. They are not 120Hp. They are far from it. In those days the specs where measured very differently. In todays measurements, you are looking at about a 90-95Hp engine. If she is an old displacment vessel, then that is a non issue really.
I would imagine at a guess(based on parts
prices here in NZ) could be looking at say US$2K for a rebuild kit.
Use the Cast iron cyclinder liners. They are better because the engine runs a little cooler than in a vehicle and the rings need to bit in a little more.