distributor points chain tension

pierodn · Nov 24, 2016

Hi All.
I have fitted in place the distributor points chain.
It is new from Andover.
It is not very tight, it moves up and down about 3/4 mm.
Is it normal?
Thank you.
Piero

texasSlick · Nov 24, 2016

I would think the distributor points chain would have the same specification as the magneto chain. Normal up - down movement for a magneto chain mid-run should be 4 to 5 mm.

Slick

pierodn · Nov 24, 2016

Hi Slick,
if so the chain works well.
Thank you.
Piero

andychain · Nov 25, 2016

Check the side plates if there is an E in a circle !!!!!!!!

pierodn · Nov 25, 2016

andychain said:
Check the side plates if there is an E in a circle !!!!!!!!

Hi Andy,
please, what means "side plates".
Sorry but i ont understand.
Thank you.
Piero

kommando · Nov 27, 2016

The plates are the outer pieces of steel that go over the ends of the pins. They are the ones you remove when breaking a chain to shorten it.

andychain · Nov 27, 2016

What he said.

Basically any reputable manufacturer puts a mark on the chain.

iwis, Regina, Renold etc. It doesnt mean its good but no mark at all !!!!!!!

Andy

pierodn · Nov 27, 2016

Hi.
I will see.
But i bought it new from Andover!
Thanks.
Piero

andychain · Nov 28, 2016

Just had a look at the Andover site and they sell mainly Renold but for the mag drive they also
sell iwis, logo is Jwis. Good chain.

pierodn · Feb 1, 2017

andychain said:
Just had a look at the Andover site and they sell mainly Renold but for the mag drive they also
sell iwis, logo is Jwis. Good chain.

Hi.
the chain has too much play, more than 5 mm.
It is a Reynold and comes new from AN n. 06.7705 42L (NM18257).
You know that it is impossible to tight.
The cam sprocket, intermediate gear and and cam chain, are well in place.
I can think that the priblem is the new chain that is not good, what else?
Better to change with a new other one like Jwis?.
Thanks
Piero

nortonmews · Feb 2, 2017

Hi Piero,

Are you checking the tension with a cut-down timing cover in place? This supports the intermediate pinion spindle which can move and affect the tension. If you don't have or can't make a cut-down timing cover Andover Norton stock a specific part.

https://andover-norton.co.uk/en/shop-details/17035

Cheers

Graham

pierodn · Feb 2, 2017

Hi.
I have find the problem.
The two fixing studs in the case for fix the body was not wasted so there was not clearance.
I have fitted the two wasted studs and now the body mooves a little bit.
Now the chain is well tight.
Sorry but there is not interference with the cam chain system.
Piero

CanukNortonNut · Feb 3, 2017

pierodn said:
Hi.
I have find the problem.
The two fixing studs in the case for fix the body was not wasted so there was not clearance.
I have fitted the two wasted studs and now the body mooves a little bit.
Now the chain is well tight.
Sorry but there is not interference with the cam chain system.
Piero

Yes.
The points/magneto chain is tightened by the two upper studs on the points housing. These are undercut after the thread that the fixing nut screws onto, to allow for adjustment of tension of the chain. Make sure you have the spacer washer behind the intermediate gear.

Cheers,
Thomas

pierodn · Feb 3, 2017

CanukNortonNut said:
pierodn said:

Hi.
I have find the problem.
The two fixing studs in the case for fix the body was not wasted so there was not clearance.
I have fitted the two wasted studs and now the body mooves a little bit.
Now the chain is well tight.
Sorry but there is not interference with the cam chain system.
Piero

Click to expand...

Yes.
The points/magneto chain is tightened by the two upper studs on the points housing. These are undercut after the thread that the fixing nut screws onto, to allow for adjustment of tension of the chain. Make sure you have the spacer washer behind the intermediate gear.

Cheers,
Thomas

Ciao Thomas,
I have the plain washer in place.
Why you need on Atlas/P11/N15 and not on Commando?.
Piero

CanukNortonNut · Feb 4, 2017

pierodn said:
Yes.
The points/magneto chain is tightened by the two upper studs on the points housing. These are undercut after the thread that the fixing nut screws onto, to allow for adjustment of tension of the chain. Make sure you have the spacer washer behind the intermediate gear.

Cheers,
Thomas

Ciao Thomas,
I have the plain washer in place.
Why you need on Atlas/P11/N15 and not on Commando?.
Piero[/quote]

Piero,
It has to do with the twin chain design of the intermediate gear. If you look at a Commando where the points are driven off of the cam, the boss that the bearing rides in is protruded about the width of the washer. :wink: The twin chain gear is flush. If you forget the washer, your gear has the possibility of contacting the engine crankcase. If you have both to compare you will see what I mean.
Cheers,
Thomas

pierodn · Feb 5, 2017

Hi Thomas,
I understand, thank you.
Piero

Matt Spencer · Feb 5, 2017

Anybody with a chain , puts a straight edge / steel ruler , along the sprockets - to check alignment .

You could always fit a Magneto , then you can throw ALL the rest of the electrics in the trash , bar the Kill switch .