garmstro55
Senior Member
Took a trip this weekend and due to time constraints was running about 3000 RPM on Yanmar 4LH-STP and Hurth 63-IV-2.5 transmissions.
About 2 hours into the return leg I felt the boat pull to port while at the same time losing a few knots. I thought I hit something but it all seemed normal so I powered back up. After another 5 minutes it happened again. Engines were at normal temps.
I took a temp measurement on the trans housings, stbd was 130 and port about 150. Trans fluid level looked ok and no discoloration or burnt smell.
Is it possible the port trans is slipping due to being too hot? The manual says 176 F at 2500 RPM so I don't think so but maybe I'm missing something.
Ran at 2000 RPM the rest of the way home, about an hour. and both trans cases were at 110F when we got to the slip.
Any thoughts?
About 2 hours into the return leg I felt the boat pull to port while at the same time losing a few knots. I thought I hit something but it all seemed normal so I powered back up. After another 5 minutes it happened again. Engines were at normal temps.
I took a temp measurement on the trans housings, stbd was 130 and port about 150. Trans fluid level looked ok and no discoloration or burnt smell.
Is it possible the port trans is slipping due to being too hot? The manual says 176 F at 2500 RPM so I don't think so but maybe I'm missing something.
Ran at 2000 RPM the rest of the way home, about an hour. and both trans cases were at 110F when we got to the slip.
Any thoughts?