Camshaft bush removal

Hi Peter. never had to replace the bush myself but I would consider this method.

With a Dremmel mini drill I would grind 2x slots in the inside of the bush on opposite sides so you could get a large "penny washer" or suitable shaped piece of metaltocatch into the grooves. You might also need to slightly bend the washer so it clicks into the gooves...bent side entered first. You will also need a slide hammer.

Fit the washer to the end of the slide hammer depending on the slide hammer you might need a nut and bolt to pass through the washer.

Heat the crankcase up in an oven to around 150-200 degrees C, then fit the washer into the slots in the bush and then operate the slide hammer to pull out the bush.

As far as the timing disc goes. I have a feeling that there was a later version breather disc that was supposed to givebetter crankcase breathing, with adifferent blow-off timingso if your one is new, I would guess that is the improved version. You would have to check that your one is the newer version though...I do not have one for comparison.

Regards

Les H

Peter: IHAVE JUST THOUGHT OF ANOTHER METHOD:

I am not sure whether the bush is open at the bottom or not. If it is it will be more simple...IF NOT, you will have to drill through the "Blind" end with a small drill and then just stop as you get to the alloy casing . This would not be difficult.

Heat the crancase again and lie it firmly down on its side and get some one to hold it (wearing gloves) very firmly.

Half fill the bush with engine oil, then enter the camshaft, it should stop when it meets the oil.

Then tap firmly the top end of the camshaft with a mallet and if you are lucky the bush will move upwards, pushed by the Hydraulic pressure that you are creating by driving the camshaft downwards.. further filling with oil should allow you to pump the bush out most of the way and use mole grips for the final removal.

Worth a try methinks.

Les H

VERSION 2 ADDENDUM: there is a chance that the camshaft lubrication grooves might vent off the oil pressure. I

If this happens it would be quite easy to find an old camshaft and fill the grooves with body filler or similar. Otherwise you will have to find a rod that that is the same size as the camshaft ends (orget one made up) and use this.

Les

MESSAGE TO MODERATOR. COULD YOU DO ME A FAVOUR PLEASE AND RE-ENTER THEM IN THE ORDER I SENT THEM?

NOTHING IS MORE ANNOYING THAN SEEING THESE MESSAGES APPEAR IN A REVERSED ORDER. WHY IS THIS STILL ALLOWED TO GO PLEASE????????

I AM NOT THE ONLY ONE WHO HAS ASKED FOR THIS CRAZY SYSTEM TO BE RECTIFIED, WHY ON EARTH DO YOU DO NOTHING?

I THINK THIS REALLY SHOWS UP THE NOC WORLDWIDE AS A POOR SHOW, surely you must find this embarrasing?

I URGE YOU TO GET THIS PROBLEM SORTED!

Les H

VERSION 2 ADDENDUM2.

As the bush is also the breather blow off hole IT IS OF COURSE open already!!!! My mental picture failed me here...sorry.

SO the hydraulic method in this case would be impossible UNLESS you ALSO sealed of the exit to the breather, which is not impossible.

The Hydraulic methodwas worth mentioning though as there are plenty of blind bushes in many engines and the method could be a useful one to try.

So Peter, It seems that my first suggestion (Slide hammer) would be the one I would try and the second (hydraulic) one, cannot be implemented in a practical way (but not impossible) with the driveside camshaft bush due to the breather hole. Oh well!

Regards

Les

Previously wrote:

Hi Norton enthusiasts.

Can anyone give me any tips on the removal of the drive side camshaft bush on my 1960 Dominator 99?

It's a bit difficult being a semi blind hole with the breather disc at the end of it. Suppose the easy solution would be to send it off to a specialist bike workshop but what fun would that be!

A second relatedproblem is the position of the static breather disk.The axis, going through the centre of the two holes, is about 45 degrees to the horizontal, pointing to the top corner of the crankcasecasting. This corresponds to the rotary disk on the camshaft end when the pistons are midway down the barrel on the downward stroke; which seems right. The new rotary disk I've just purchased,would require the static disk axis to be on the horizontal! Were there two different types?

Any help/advice would be much appreciated.

Peter.

hello peter, Right the breather in the 45% position that's in the crankcase , well if you think about it the camshaft as 4 holes in the middelto let pressor out and as the camshaft rotates it does not matter where the out let holes line up as long as the engine can breathe ,the only time you need to change the camshaft bushes is when there worn ,and to get then out you will need a press drill and the right size reamers , you have to heat up the crankcases first , then carefully Reame out the bush ,but you mayfind that bush get jamed to the reamer and spins round , then you have stop and see if it will come out on the reamer ,hope this help you yours anna j dixon

Hi Peter. congratulations I'm glad you got the bush out. Necessity is the mother of invention they say and your extractor bolt method seems a good idea, pity your bolt was tooshort.

You could have saved some effort if you had used and electric jig saw with a fine tooth metal cutting blade rather than a hacksaw.

Yes all good methods and ones to store in the memory bank for all future (not necessarily the same) type of job.

Best regards.

Les H