75 Mark III refurb/mod project

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Re: 75 Mark III refurb/mod project

Postby grandpaul » Wed Dec 16, 2009 9:18 pm

It's half a dozen of one and six of the other. These are the double lipped outer races, so only the inner race stays on the crank. They have a "loose lip" on the opposite side of the inner race that functions as the bearing shoulder. Same technical spec, just a bit different arrangement of bits.

No need to change yours.
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Re: 75 Mark III refurb/mod project

Postby L.A.B. » Thu Dec 17, 2009 2:16 am

byrdman76 wrote:Paul - the superblends in the cases look like one is facing one direction and one is facing the other. Is this correct? The reason I ask is that I have never installed these and I installed mine both with the smooth side up with the inner race facing the crank. This is the way that the races came out of the bearings so I installed them into the cases accordingly.


As I understand it, it is generally considered good practice to fit the races the same way around as they come out of their packaging? Which would normally be with the bearing inner and outer race markings on the same side of the bearing, so if that's the way you have fitted them, then I would say it was correct.
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Re: 75 Mark III refurb/mod project

Postby byrdman76 » Thu Dec 17, 2009 6:51 am

Really good info guys. I had just gotten done shimming the crank, so I'm glad that I do not need to change anything.

Thanks again,

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Re: 75 Mark III refurb/mod project

Postby grandpaul » Thu Dec 17, 2009 6:10 pm

New chamchain and cleaned up oil pump-

Image

New timing cover seals (including a new rubber on the oil pump nipple); the cam seal is a bugger to remove, I tore the old one up-

Image

Timing side all nipped up-

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Re: 75 Mark III refurb/mod project

Postby grandpaul » Thu Dec 17, 2009 6:13 pm

byrdman76 wrote:Paul - the superblends in the cases look like one is facing one direction and one is facing the other. Is this correct? The reason I ask is that I have never installed these and I installed mine both with the smooth side up with the inner race facing the crank. This is the way that the races came out of the bearings so I installed them into the cases accordingly. Do I need to change mine to look exactly like yours?


Remember that what you want on installation is for the loose inner race lips to fit up to the crank, so the crank can be removed without struggling. Simply use a bearing splitter to remove them from the crank in the future.

I have pulled apart cases where one or both bearings were installed backwards and it was a major pain to free the crank from the cases after splitting them (also with much effort)
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Re: 75 Mark III refurb/mod project

Postby L.A.B. » Fri Dec 18, 2009 2:45 am

grandpaul wrote:Remember that what you want on installation is for the loose inner race lips to fit up to the crank, so the crank can be removed without struggling. Simply use a bearing splitter to remove them from the crank in the future.

I have pulled apart cases where one or both bearings were installed backwards and it was a major pain to free the crank from the cases after splitting them (also with much effort)


I think you may have misunderstood byrdman76's question?

As I believe what byrdman76 wanted to know was why your photo apparently shows the OUTER races fitted in the cases the oppsite way around to each other?
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Re: 75 Mark III refurb/mod project

Postby grandpaul » Fri Dec 18, 2009 7:11 am

I wasn't paying attention, but these have markings on both sides of the inner and outer, and I lost track. Still mounted them up with the lipped inner races mated to the crank cheeks, and the loose lips to the outside. I don't believe it will be an issue in operation at all.
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Re: 75 Mark III refurb/mod project

Postby sns » Fri Dec 18, 2009 2:25 pm

grandpaul wrote:I wasn't paying attention, but these have markings on both sides of the inner and outer, and I lost track. Still mounted them up with the lipped inner races mated to the crank cheeks, and the loose lips to the outside. I don't believe it will be an issue in operation at all.


yikes. believing or knowing, which would you trust at 100+mph?
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Re: 75 Mark III refurb/mod project

Postby grandpaul » Fri Jan 08, 2010 10:42 pm

Polished yokes arrived today, now I'm anxiously awaiting the second swingarm to finally build the monoshock arm system.

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Re: 75 Mark III refurb/mod project

Postby grandpaul » Fri Jan 08, 2010 10:43 pm

sns wrote:yikes. believing or knowing, which would you trust at 100+mph?


Turns out the manufacturer states it's not an issue beyond ease of removal; they are not direction specific / sensitive.
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Re: 75 Mark III refurb/mod project

Postby grandpaul » Sat Jan 16, 2010 3:40 pm

FINALLY received the second Mark III swingarm to build the monoshock swingarm with-

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The rubber boots on these isolastics are almost new, which is good because the ones on the bike are hard and torn-

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Sent off the hubs to Buchanan's for lacing up to the new Excel amuinum rims-

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Everything else is here to get busy and assemble the engine. Just need to complete the swingarm installation, then tranny, then engine in frame.
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Re: 75 Mark III refurb/mod project

Postby swooshdave » Sun Jan 17, 2010 8:23 pm

sns wrote:Are there any other proprietors /dealers/manufactures/mechanics in this forum posting their projects non-stop? The bike contest that has little to do with this forum at best, the link to this bike contest and more importantly the link to one's business, does that not constitute advertising?

Specifically, is this form of indirect advertising approved by site owner Jerry Doe?


Please bear in mind that if an individual without ulterior business motives and links in his or her signature were posting these projects, I would not be compelled to express my distaste here. Quite the contrary.

If this site is paid for by certain members that run their indirect business adverts via "project" threads, then that is another story.


If Jerry had a problem with these posts they would have been gone a long time ago.
You probably want to go into town, and find a up to date Jap Bike store,
With a full spares department, a clean workshop, and kean young mechanics.
And ask them if theres a Grumpy Old Bloke out in the Hills, who knows how to fix Real Motorcycles.

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Re: 75 Mark III refurb/mod project

Postby swooshdave » Sun Jan 17, 2010 8:45 pm

I recommend that if you have an issue you can PM both Jerry and LAB.
You probably want to go into town, and find a up to date Jap Bike store,
With a full spares department, a clean workshop, and kean young mechanics.
And ask them if theres a Grumpy Old Bloke out in the Hills, who knows how to fix Real Motorcycles.

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Re: 75 Mark III refurb/mod project

Postby RennieK » Sun Jan 17, 2010 9:00 pm

sns wrote:Perhaps Jerry has not seen this type of behavior from another point of view. Things do change. Sometimes for the worse. Sometimes for the better. Just because this behavior has gone on a long time don't make it right.


Perhaps Jerry will perceive this behavior in another light. And perhaps this thread will too go the way of the other suspect thread, which did take all of 3 pages to be justly sent to oblivion.

More importantly, does Jerry stand by this proprietor and his business, whether as paying forum sponsor or indirect advertiser? I have not see this proprietor in Jerry's Links section nor have I seen express advertising here in any manner. I personally know several professional mechanics who frequent and contribute to this site and they have never displayed this type of behavior.

I don't know Jerry's stance on this but there are always links to businesses web sites freely posted here. Born Again Bikes (BAB) threads were one of THE things that drew me into to this site when I came across it a year ago. BAB's has always encouraged others to do likewise so I know the proprietor, Paul would enjoy it if some of us also helped carry the torch. It seems to me there were some stats done on different threads and BAB's were among the highest read. We want more of this type of content so please tell your mechanic friends to post their projects asap! Share their trials and tribulations for all to see, we'll eat it up!
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Re: 75 Mark III refurb/mod project

Postby Cookie » Sun Jan 17, 2010 9:43 pm

I think a lot of us enjoy a well done build thread since we have a great mix of folks here, from beginners to old timers, with all levels of skill sets. I have learned and relearned a lot from threads like this. I have also not rebuilt a Norton since the 70s and I have not only forgotten most of what I knew, I've also mixed in other bikes and equipment I've worked on in the past. I seem to recall somebody asking about removing a swing arm and I told them how to do a BMW in error, until corrected of course by forum members.
Stuff I've learned here just helped us put right Fanco's Norton in short order. Which by the way I wish he'd post since it is now a pretty bike.
Last edited by Cookie on Mon Jan 18, 2010 11:46 am, edited 1 time in total.
Regards,
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