New style Andover Norton Tappets

CanukNortonNut · Jul 28, 2023

Has anyone installed and used these new design tappets on your bike?
06.7820
Here is a link: https://andover-norton.co.uk/en/sho...-pair-in-ex-for-one-cylinder-nm22771-nm22772-

Comments.
Thanks

ILLF8ED · Jul 28, 2023

I have not looked at mine for a few years. What is different with these Andover lifters?

CanukNortonNut · Jul 28, 2023

No more stelite pads. New hardness process where cam contacts lifter.
From what I understand.

ashman · Jul 28, 2023

Expensive little f#*kers for one cylinder only.

CanukNortonNut · Jul 28, 2023

Yup and then add a new cam and whatever else needs doing and more $$$.

ashman · Jul 28, 2023

I am glad I built my hot motor back in the early 80s things were a lot cheaper, I made a jig up and gave my lifters a grind on a surface grinder when I got Ivan Tighe to build up my stock cam to 2S grind still running them today, I have also brought 2 sets of lifters cheap off E bay for $20 a full set each, one set has light wear but the other set don't have any wear on the pads at all, can be lucky sometimes.
I love to build a hot motor using Jim's bits but way out of my price range unless I win lotto, I can only dream lol.

johnm · Jul 28, 2023

ashman said:
I am glad I built my hot motor back in the early 80s things were a lot cheaper, I made a jig up and gave my lifters a grind on a surface grinder when I got Ivan Tighe to build up my stock cam to 2S grind still running them today, I have also brought 2 sets of lifters cheap off E bay for $20 a full set each, one set has light wear but the other set don't have any wear on the pads at all, can be lucky sometimes.
I love to build a hot motor using Jim's bits but way out of my price range unless I win lotto, I can only dream lol.

Check those ebay lifters very carefully for pad detachment. You are looking for any sign of oil weeping from under the stelite.

In the 80s or 90s there were a bunch of followers sold that had a habit of loosing the pads. A lot ended up in the ebay after market. This information is from a friend working in retail at the time and subsequently as a Norton engineer. He has repaired several motors which have lost the stelite pads.

Tornado · Jul 28, 2023

I believe Jim Comstock had a hand in developing the AN units. Should be good'uns, Eh!

KiwiShane · Jul 28, 2023

At almost double the price of existing stock thats out there...they would want to be good...

ashman · Jul 28, 2023

johnm said:
Check those ebay lifters very carefully for pad detachment. You are looking for any sign of oil weeping from under the stelite.

In the 80s or 90s there were a bunch of followers sold that had a habit of loosing the pads. A lot ended up in the ebay after market. This information is from a friend working in retail at the time and subsequently as a Norton engineer. He has repaired several motors which have lost the stelite pads.

All good Johnm I prob won't ever use them but the pads are all good for at the time $20 was good one set looks like it came out of a new motor as they have no wear on them at all even where they slide up the tunnels no sign of wear and as for the other set only 2 need a light grind, the pads on both sets are very solid., no longer working I no longer have access to the machinery to do the grinding, that was the best part of working in the maintenance workshop at a tec college (TAFE) for 31 years, but still kept the jig to grind 2 at a time.

Ashley

hybridracer · Jul 29, 2023

I an not sure if the heavyweight twins ever used stellite on the cam followers. In 1982 (after one broke in my 1957 Domi 88 Hybridracer) I had several, ranging from a radiused '57 through '60's flat to a new Commando one, tested in a mass spectrometer that the company I worked at had recently acquired. To my surprise they all turned out to be 20% chrome steel with not a trace of cobalt! A few years later when I was lucky enough to be employed at Norton I checked the drawing which did indeed specify stellite but, I guess no-one could ever check what was actually used.

Madnorton · Jul 31, 2023

The old pads were Delcrome C, the new one piece tappets are majority Cobalt / Chrome throughout with a few other additions. Hundreds sold and not had a set destroyed yet.

New style Andover Norton Tappets

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