Norton commando 750 1972 Camshaft bush and washers

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rpatton said:
I just had a look at the MkIII parts lists and they have a pair of the 06-5428 bushings on the timing side. So I should have been saying Pre-MkIII 850 on all the issues I mentioned before. One more reason for MkIII envy. I hear there's some of them in crates somewhere going cheap :D
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That's just a different animal.
 
My bush stickes out into the timing side just as much as the thickness of the tabbed washer. It provides the support for the tabbed washer to remain in place. It seems to me right!!!
 
chiccogarz said:
My bush stickes out into the timing side just as much as the thicknWheref the tabbed washer. It provides the support for the tabbed washer to remain in place. It seems to me right!!!
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does the shoulder of the camshaft protrude past the bushing at all? This Is of course where a cam sprocket would butt up against.
 
pete.v said:
chiccogarz said:
My bush stickes out into the timing side just as much as the thicknWheref the tabbed washer. It provides the support for the tabbed washer to remain in place. It seems to me right!!!
Click to expand...
does the shoulder of the camshaft protrude past the bushing at all? This Is of course where a cam sprocket would butt up against.
Click to expand...


Norton commando 750 1972 Camshaft bush and washers
 
I did not quite understand what you mean but I think the picture should help. It was before splitting the cases. The washer is in place and you can see that the bush, the dark gray rim betwenn the camshaft and the tabbed washer, provides the support for the washer.
 
I'm at this point now with my '72 combat. I'm using 06-3020 timing side cam bush that has a built in thrust washer on the inside of the crankcase (mushroom type). I have the steel 06-1086 thrust washer on the inside of the case between the camshaft and cam bush. Now on the outside I see the cam bush protrudes beyond the aluminum case so that the cam sprocket would rub only the bush which is not much material and I would expect quick wear. Also have several thousandths end play on the camshaft. I don't believe the 06-2601 thrust washer fits over the OD of the cam bush so in my case would not work. Am I correct. So is a thrust washer supposed to be on the outside of the case or not?>between the cam sprocket and case.
 
illf8ed said:
I'm at this point now with my '72 combat. I'm using 06-3020 timing side cam bush that has a built in thrust washer on the inside of the crankcase (mushroom type). I have the steel 06-1086 thrust washer on the inside of the case between the camshaft and cam bush. Now on the outside I see the cam bush protrudes beyond the aluminum case so that the cam sprocket would rub only the bush which is not much material and I would expect quick wear. Also have several thousandths end play on the camshaft. I don't believe the 06-2601 thrust washer fits over the OD of the cam bush so in my case would not work. Am I correct. So is a thrust washer supposed to be on the outside of the case or not?>between the cam sprocket and case.
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Because you are at this stage, do you have this thrust washer to play with. If the washer would fit over the protruding cam bush, do you feel that it would eliminate much of your endplay or just keep the face of the cam sprocket from hammering against the end of the protruding bush?

In addition, if the bush did not protrude and the washer was applied over the shoulder of the cam where the cam sprocket rest, do you feel that it would eliminate much of your endplay or just keep the face of the cam sprocket from hammering against the case.
 
My late 72 only had one washer, inside the case. Heres what it looked like.
Norton commando 750 1972 Camshaft bush and washers

A disaster ready to happen.
All I did was clip the tab off and file down the rough edge and reinstall. Be sure the grooves face the cam.
 
Because you are at this stage, do you have this thrust washer to play with. If the washer would fit over the protruding cam bush, do you feel that it would eliminate much of your endplay or just keep the face of the cam sprocket from hammering against the end of the protruding bush?

In addition, if the bush did not protrude and the washer was applied over the shoulder of the cam where the cam sprocket rest, do you feel that it would eliminate much of your endplay or just keep the face of the cam sprocket from hammering against the case.[/quote]

I don't have the thrust washer 06-2601 now, but will likely buy one to do as you say. I do believe it would eliminate much of the end float of the camshaft and at least make me feel better about a bearing surface for the cam spocket to run against. Give me until the weekend and I'll report back.
 
Playing with this a little during the week. Conclusion is to use an oilite thrust washer between the cam sprocket and the timing case. The perfect size is standard at 1" ID, 1.5" OD and 1/16" thick. This leaves 0.012" end play on the camshaft in place and provides a nice sintered bronze surface on both sides of the camshaft to rub against. Will post some pictures this weekend.
 
illf8ed said:
Playing with this a little during the week. Conclusion is to use an oilite thrust washer between the cam sprocket and the timing case. The perfect size is standard at 1" ID, 1.5" OD and 1/16" thick. This leaves 0.012" end play on the camshaft in place and provides a nice sintered bronze surface on both sides of the camshaft to rub against. Will post some pictures this weekend.
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Where did you get this iolite thrust washer, if I may ask?
 
You need a washer between the stock cam bush and the timing gear sprocket. You could fit a better one that's for sure. But the best way is to split the cases and fit a shouldered 828 style shouldered bushing. The shoulder becomes the washer. Plus less pieces to deal with. I believe end-play worrys were not much dealt with at the factory as a tease for us 45 years later. Tea break.
 
Torontonian said:
You need a washer between the stock cam bush and the timing gear sprocket. You could fit a better one that's for sure. But the best way is to split the cases and fit a shouldered 828 style shouldered bushing. The shoulder becomes the washer. Plus less pieces to deal with. I believe end-play worrys were not much dealt with at the factory as a tease for us 45 years later. Tea break.
Click to expand...

Ok. Turn a 1 hour job into a 20+ hour job and maybe have to line bore/reem the new bushes? That sounds like a much better plan. :roll: This would also be an opportunity to spend a few thousand bucks that I don't have on rods and pistons and what not.

I think I will stick with plan A and leave my retiremant account alone this time.
 
I see this camshaft has appeared on eBay so could be a 1972 (combat) ?

Norton commando 750 1972 Camshaft bush and washers
 
pete.v said:
illf8ed said:
Playing with this a little during the week. Conclusion is to use an oilite thrust washer between the cam sprocket and the timing case. The perfect size is standard at 1" ID, 1.5" OD and 1/16" thick. This leaves 0.012" end play on the camshaft in place and provides a nice sintered bronze surface on both sides of the camshaft to rub against. Will post some pictures this weekend.
Click to expand...
Where did you get this iolite thrust washer, if I may ask?
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The oilite thrust bearing is coming from amazon.com. They are $0.99 each, so bought five. Shipping was around $8.
 
Time Warp said:
I see this camshaft has appeared on eBay so could be a 1972 (combat) ?

Norton commando 750 1972 Camshaft bush and washers
Click to expand...
Is there more to this picture? From what I see it does not look like a commando camshaft.
 
illf8ed said:
Time Warp said:
I see this camshaft has appeared on eBay so could be a 1972 (combat) ?
Click to expand...
Is there more to this picture? From what I see it does not look like a commando camshaft.
Click to expand...

Sorry about that,the picture link was taken directly off the eBay auction. (Thanks L.A.B)
Right click view image is another option.

http://www.ebay.com.au/sch/havnine/m.ht ... 1423.l2654

The seller (Australia) has a group of parts including 1972 ? engine cases,the cam and oil pump I was thinking might be ok for my 1971 750 if they are indeed low mileage.
The cam I took out of the 750 had the beveled (steel?) type trust washer behind the sprocket,it seems even though the 750 engine had been around a while,Norton elected to change a lot of things for the year 1972 version.
 
'72 was indeed the year of experimental radical changes for such an old motor. The steel bevelled washer goes to the crankside of the timing case : the purpose of the angled cutted bevel is to accomodate /clear the tachometer drive gear. It was not to be fitted on camshaft end before the timing gear sprocket. But you could do it I think as the whole arrangement here is :shock:
 
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