Planning ahead - fitting the primary drive unit back in place'

[McCabe-Thiele (Ted)]

Just removed the circlip to check the primary drive cushions - they are very hard so I intend to replace them when my parts arrive from DS.

When I dismantled the primary drive it came out like in the picture when I drifted out one bearing, the second  bearing  is still on the shaft.

What is the best way to re-assemble this when I eventually fasten up the crank cases?

.primary drive hub by Macabe Thiele, on Flickr

[Bryanj]

Back in same way it came out Ted, centre part with bearings, collars and gear held in place shaft with bearing and gear fed in from clutch side, more difficult to explain than do!

[McCabe-Thiele (Ted)]

The photo I posted is how it came out - atm the shaft is pretty much stuck to the central hub, photos in my manual show the left side primary drive main bearing as being placed in situ. The Starter Clutch & Primary drive hub with the chain in place lying with the starter gear meshed between 2/3 gear on the main shaft. Presumably when the casing halves are fitted together the shaft is then fitted from the clutch end of the casing.

Does this sound right?

Is there supposed to be a circlip fitted at the end of the shaft where the end gear is fitted in my photo can't remember if mine had one or not tbh ?

[Bryanj]

Neither can i Ted, look at the parts book, and yes you fitting idea is correct

[McCabe-Thiele (Ted)]

Parts book showing the primary drive does not show the gear yet alone any circlip. It must be listed somewhere else.

[Bryanj]

Clutch page?

[Bryanj]

Yup, part number 9451020000 20 mm circlip

[McCabe-Thiele (Ted)]

After soaking the hub in petrol for an hour or so I have managed at last to remove it from the shaft without causing any damage.

Currently soaking the other end in the hope it will loosen the end gear.

[davidcumbria]

Ken and I had a recent exchange on this which you might find helpful Ted 👍
http://www.sohc.co.uk/index.php/topic,29234.msg281319.html#msg281319

[Oddjob]

Not understanding your comments about the hub not coming off the shaft Ted, as it's the only way you can remove it from the crankcase it must have come off originally for you to take pics of it. Most are really really easy to remove, they almost fall off.

[Oddjob]

As for fitting it back in place Ted, I'd check both of the roller bearings for wear and play etc. Just put the shaft in a vice with the roller bearing sat on the top and after removing the circlip and the gear if it comes off you can just tap the shaft down leaving the bearing on top of the vice.

Reassemble the shaft with the bearing or a new bearing if required, tap home the bearing next to the oil pump, remove the oil pump as well. With the crankcases bolted together and it sitting on it's cylinder studs so the top case is at the bottom you fit the primary drive hub onto the primary chain with the starter gear nearest the oil pump, tap the primary shaft into the hub until it's just about coming through, there is a spacer that needs to be fitted that sits inside the starter gear now, if you fit it before the vibration of you hitting the primary shaft will dislodge it so fit it as described. Tap the shaft further in so the spacer is now on the shaft, here's the tricky bit. You need to look through the oil pimp opening and see where the end of the shaft is and which direction it needs to be moved to line up with the roller bearing, if you have a new chain and rubbers this will involve using a lever to move it to where it needs to be, protect the crankcase as you lever against it so it doesn't damage any surfaces. Small piece of wood will do. When you lever the shaft to align it with the roller bearing in the crankcase tap the shaft home, you may need to move the shaft a little to get the other roller bearing to go into place. Fit the gear (if not already fitted) and the circlip

[McCabe-Thiele (Ted)]

That makes partial sense to me as a serial overthinker & problem imaginer - has anyone done  a video on U tube a link would be great?

It might be worth a dry run without Hondabond first.

[Bryanj]

Honestly Ted its way easier than the descripion, you did the 400 so you can do this one!

[Oddjob]

Do not do a dry run Ted, potential for double the damage.

[McCabe-Thiele (Ted)]

Honestly Ted its way easier than the descripion, you did the 400 so you can do this one!

The 400 was pretty easy as the centre section did not have a spacer to fall out iirc - it seemed more like one unit somehow.