Earlier I made a reply to a previous YP-7M post and added a question of my own. I realise it would have been more appropriate to start a new topic. Here it is.
Couple years ago I had to refurbish the forward snd reverse friction plates in my YP-7M gearbox. While at it I replaced bearings. When completing my voyage to Victoria from Port Stephens I noticed the shifter cover was getting very hot; so hot that the nearby oil dip stick fell out of the plastic cap it was attached to.
Back in Vic, I pulled engine and gearbox out for a complete overhaul.
Under the shifter cover is where the forward/reverse lever pushes a U-shaped bronze bush against a steel bobbin which in turn moves the shifter shaft.
In this case the bronze bush was badly worn. It wasn’t worn when I reassembled the gearbox prior to the trip. I concluded that it was a lubrication failure.
I studied the manual but am struggling to see any active form of lubrication to the bronze bush. The original bush showed no evidence of being a pre-oiled sintered bronze unit.
My best guess is that when I replaced the bearings with new ones, they had dust seals and that this prevented an oil mist from passing from the main gear housing and through the bearing into the shifter box and onto the bronze bush.
Can any forum member give me an authoritative explanation for how the lubrication actually works?
Couple years ago I had to refurbish the forward snd reverse friction plates in my YP-7M gearbox. While at it I replaced bearings. When completing my voyage to Victoria from Port Stephens I noticed the shifter cover was getting very hot; so hot that the nearby oil dip stick fell out of the plastic cap it was attached to.
Back in Vic, I pulled engine and gearbox out for a complete overhaul.
Under the shifter cover is where the forward/reverse lever pushes a U-shaped bronze bush against a steel bobbin which in turn moves the shifter shaft.
In this case the bronze bush was badly worn. It wasn’t worn when I reassembled the gearbox prior to the trip. I concluded that it was a lubrication failure.
I studied the manual but am struggling to see any active form of lubrication to the bronze bush. The original bush showed no evidence of being a pre-oiled sintered bronze unit.
My best guess is that when I replaced the bearings with new ones, they had dust seals and that this prevented an oil mist from passing from the main gear housing and through the bearing into the shifter box and onto the bronze bush.
Can any forum member give me an authoritative explanation for how the lubrication actually works?
