Cam follower and tunnel dimensions

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splatt

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Does any one have dimensions for cam followers and tunnels,I noticed they were loose so measured them and discovered they have about 0.005'' clearance. I have a set of used followers that measure up better at about 0.0025'' clearance.
My tunnels measure at 1.187'', followers 0.591'' and the used ones 0.59225. Do my measurements correspond with what they are ment to be ?
 
The cam follower tunnels should measure 1.1865" to 1.1875".
This figure has been taken from a photocopy of the original drawings sent to me by Nick Hopkins (Andover Norton) when I asked for information regarding boring the tunnels oversize. (For oversize add 0.020" to those figures).

Unfortunatelty the cam followers are not shown on the drawings so I cannot advise, or at least, I can't see them.
 
I noticed that when mine was apart there was a letter (I think) stamped near each of the tunnels, I assumed they must have had a few different tolerance grades in the factory to match to sets of followers to give the correct clearance much like ford did with the kent engine bores?
 
Reggie said:
The cam follower tunnels should measure 1.1865" to 1.1875".

So the tunnels are ok, but for some reason the lifter bodies have worn badly, which is a bummer because the faces are still good.
Click to expand...
 
splatt said:
Reggie said:
The cam follower tunnels should measure 1.1865" to 1.1875".

So the tunnels are ok, but for some reason the lifter bodies have worn badly, which is a bummer because the faces are still good.
Click to expand...
Click to expand...

I belive you can get oversize followers, but don't quote me, I'm not a Norton spares expert.
 
Bernhard wrote;
I belive you can get oversize followers, but don't quote me, I'm not a Norton spares expert.
Click to expand...

Yes you can, they are 0.020" oversize, but you need your cam tunnel boring 0.020" over size to accomodate them.
 
Cam tunnel size on an oooohhhh! 50 year old 500 Domi barrel is 1.182 -1.184 inch.
Cam follows on later satellite tipped cam followers is;
At bottom….1.175 inch
At top…... 1.177 inch
 
Bernhard said:
Cam tunnel size on an oooohhhh! 50 year old 500 Domi barrel is 1.182 -1.184 inch.
Cam follows on later satellite tipped cam followers is;
At bottom….1.175 inch
At top…... 1.177 inch
Click to expand...

1.175'' -1.177 thats nearly 0.010'' clearance, you dont mean 1.185'' by any chance?
 
splatt said:
Bernhard said:
Cam tunnel size on an oooohhhh! 50 year old 500 Domi barrel is 1.182 -1.184 inch.
Cam follows on later satellite tipped cam followers is;
At bottom….1.175 inch
At top…... 1.177 inch
Click to expand...

1.175'' -1.177 thats nearly 0.010'' clearance, you dont mean 1.185'' by any chance?
Click to expand...

No, I'm afraid not, the barrel & cam followers were brought separately, and were made at least 40years ago, so there will be some wear.
Both were measured with an electronic digital vernier gauge.
 
splatt said:
Reggie said:
The cam follower tunnels should measure 1.1865" to 1.1875".

So the tunnels are ok, but for some reason the lifter bodies have worn badly, which is a bummer because the faces are still good.
Click to expand...
Click to expand...
Reason is the followers are "canted " forced back and forward , due to the cam contact angle, Norvil as a set on Ebay..just the same, scored side's and re- faceing required . and wants a £100 for them :roll:
 
Reason is the followers are "canted " forced back and forward , due to the cam contact angle, Norvil as a set on Ebay..just the same, scored side's and re- faceing required . and wants a £100 for them :roll:[/quote]

Are they still 75 pound per cyl new, 100 for a rooted set sounds like a bargin
 
Given the push rod tunnel bore is in good shape why not have the followers plated then ground to match the bore? Chrome and Electroless nickle are both inexpensive and would increase the lubricity as well as improve wear characteristics..
 
domiracer66 said:
Given the push rod tunnel bore is in good shape why not have the followers plated then ground to match the bore? Chrome and Electroless nickle are both inexpensive and would increase the lubricity as well as improve wear characteristics..
Click to expand...
If they require new "shoes" is that expensive?
 
john robert bould said:
domiracer66 said:
Given the push rod tunnel bore is in good shape why not have the followers plated then ground to match the bore? Chrome and Electroless nickle are both inexpensive and would increase the lubricity as well as improve wear characteristics..
Click to expand...
If they require new "shoes" is that expensive?
Click to expand...

If you are referring to the Stelite pads these can simply be dusted off with a surface grinder. I clamped mine in a V-block after squaring them up on the magnetic chuck and took a couple thou off until the cleaned up.. Any competent machine shop with a surface or tool grinder would be more than capable of doing this for less than $50. If the Stelite pad has separated I would say they are scrap..
 
Any idea how you would hold them in pairs to regrind them?, not rubbishing your idea , just wondering how you could go about it, I have used hard chrome on round followers and ground them back down and it worked very well.
 
domiracer66 said:
john robert bould said:
domiracer66 said:
Given the push rod tunnel bore is in good shape why not have the followers plated then ground to match the bore? Chrome and Electroless nickle are both inexpensive and would increase the lubricity as well as improve wear characteristics..
Click to expand...
If they require new "shoes" is that expensive?
Click to expand...

If you are referring to the Stelite pads these can simply be dusted off with a surface grinder. I clamped mine in a V-block after squaring them up on the magnetic chuck and took a couple thou off until the cleaned up.. Any competent machine shop with a surface or tool grinder would be more than capable of doing this for less than $50. If the Stelite pad has separated I would say they are scrap..
Click to expand...

Do NOT dry grind these, use plenty of coolant!!! And crack test the Stelite pads afterwards with one of the powder type kits-anybody would hate to find once an engine reassambled that you have part of a Stelite pad come off :!:
 
Clever, Ludwig. I like that.

I do mine with an old valve grinder (wet) that has tooling to resurface automotive lifters. Also works well for Nortons.

Ken
 
I was wondering if anyone knows the tolerance between cam follower and follower bore in cylinder. I am measuring with a feeler gauge at front and back (where most wear is) with follower fitted and I have 3 thou, actually I have 3 thou all the way around. The followers were a bit scored up, so I polished them.

Cheers-Jerry
 
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