Saving Old Seagulls

Sorry, just a quick one, couldn't find the answer in the archives: I took off a rubber washer, a metal washer and a brass collar from the prop end of the shaft, but can't remember the order they should go back - rubber, collar, metal washer between it and the prop?

It should be Prop, spring, washer then splitpin in that order.

No rubber bits, is the prop loose on the propshaft?

H-A

Horsley-Anarak wrote:It should be Prop, spring, washer then splitpin in that order.

No rubber bits, is the prop loose on the propshaft?

H-A

No, I'm going the other way - split pin, washer, spring, prop, washer(?), brass collar, rubber washer, gearbox.

NeilF wrote:Sorry, just a quick one, couldn't find the answer in the archives: I took off a rubber washer, a metal washer and a brass collar from the prop end of the shaft, but can't remember the order they should go back - rubber, collar, metal washer between it and the prop?

All illustrated in the parts book

Thanks! No washer behind the prop. Though without the washer, the back of the prop rubs on the gear box. With, and I can't quite get the prop spring washer on. Need a thinner washer, though that was the one I took off...............

Neil - think this is probably getting all a bit confusing!

Therre shoudl be a rubber washer against the gearbox face, which si supposed to act as a bit of a grit/mud excluder - sometimes called a seal in error.
After that is the brass collar, which has a pin to go through it and the prophaft and should act as a backstop for the prop.
Then the prop goes on, the spring, and the washer that follows is heavy gauge but with a narrow 'wall' thickness. This washer is often distorted - I assume people whack them to get them to fit the spring, and they can be a bit of a trial to wriggle down enough to get the split pin in.

I don't know why the propellor should rub against the gearbox casting - this suggests a problem inside the gearbox, where maybe the spacer and/or shims behing the crownwheel is missing and allowing the propshaft to move forwards.

RickUK wrote: I don't know why the propellor should rub against the gearbox casting - this suggests a problem inside the gearbox, where maybe the spacer and/or shims behing the crownwheel is missing and allowing the propshaft to move forwards.

Behind the crown wheel there is a thrust washer and a thin shim - this gives a perfect aspect for the crown gear to mesh correctly with the pinion. I have the rubber grit seal in place then the collar with the brass pin. With everything in place, there is a small amount of float on the prop shaft, and pulling it slightly forward makes the gears noisy when turning. So far so good. I took off a washer when dismantling. Without it, the back of the prop boss does touch the gearbox. The addition of a washer brings the prop clear of the gearbox. However, now there isn't quite enough room on the shaft to get the spring washer and pin onto the shaft. A thinner washer would do it, but I'm sure this was the one that I took off..............

Double check that the brass collar is on the right way round. I have one or two where the hole for the pin is slightly offset front-to-back.

All this could be caused by a distressed spring, circa .005 is about the minimum for the gear meshing, any less & they wear on both sides of the teeth, remember this is a 30 year old gearbox, so it's never going to be Rolls Royce standard.