Norton Follies!

Fast Eddie · Dec 11, 2015

I know this is going to make me sound crude, but...

I don't think it needs welding, generous and careful application of silicone sealant will be fine IMHO.

rivera · Dec 11, 2015

Naaa.
Leave it off an attach a supercharger!

Fast Eddie · Dec 11, 2015

rivera said:
Naaa.
Leave it off an attach a supercharger!

I won't argue against that !!

texasSlick · Dec 11, 2015

Fast Eddie said:
I know this is going to make me sound crude, but...

I don't think it needs welding, generous and careful application of silicone sealant will be fine IMHO.

Hobot would "cold weld" it with JBW.

I am still waiting to know from whence came the donor piece?

Slick

Deckard · Dec 11, 2015

That looks to be a 1971 Commando with a disk brake upgrade. You don't see too many with the silver barrels these days. I'd do the weld fix too. It sure looked ugly with the timing cover in stubby mode.

pierodn · Dec 11, 2015

texasSlick said:
Fast Eddie said:

I know this is going to make me sound crude, but...

I don't think it needs welding, generous and careful application of silicone sealant will be fine IMHO.

Click to expand...

Hobot would "cold weld" it with JBW.

I am still waiting to know from whence came the donor piece?

Slick

Hi Slik.
I take the donor piece from a good 1971 case but with the left matching drive side destroyed.
Ciao
Piero

pierodn · Dec 11, 2015

Deckard said:
That looks to be a 1971 Commando with a disk brake upgrade. You don't see too many with the silver barrels these days. I'd do the weld fix too. It sure looked ugly with the timing cover in stubby mode.

Hi.
The bike was sold in Italy on 1971 as SS tangerine painted as NOC Records says.
I will restore the bike as a stock SS with the front drum brake, SS seat, tangerine tank, front high fender, small light shell, handlebar with the crossover tube, black side covers with silver decals, high pipes and mufflers with heat shields both side.
I have all these parts at home.
In Italy never liked the SS type and therefore was being sold by dealers with the Roadster bodywork.
I like very much the SS type and i think this bike will not look bad in front of sisters.
Ciao
Piero

rivera · Dec 11, 2015

pierodn said:
I will restore the bike as a stock SS ....
I have all these parts at home.

Piero

I found these on Ebay:
http://www.ebay.de/itm/Norton-Comma...172710?hash=item33a9cddba6:g:1K0AAOSwuTxV~9VZ

pierodn · Dec 11, 2015

rivera said:
pierodn said:

I will restore the bike as a stock SS ....
I have all these parts at home.

Piero

Click to expand...

I found these on Ebay:
http://www.ebay.de/itm/Norton-Comma...172710?hash=item33a9cddba6:g:1K0AAOSwuTxV~9VZ

Hi.
The seller ask 55 euro!!!!
The new silencer support costs from Andover 5,95 P (plus VAT) each one!!!!

pierodn · Dec 14, 2015

Hi.
The Norton follies go on.
The bike has a brocken standard GPM piston and a strange circles on the push rod holes side on the head and on the gasket.
I will post the picture later.
Ciao
Piero

pierodn · Dec 14, 2015

Hi.

What do you think caused the rupture of the right piston?
Why were excavated on the barrells and on the gasket those rings?

Ciao

Piero

Madnorton · Dec 14, 2015

Left hand piston has impacted a valve - you can the the marks on the ridge of the cutaway in the segment marked LH. This alone suggests that the installation of the pistons and the fitting of the head etc has been completed by someone with no experience or even mechanically capable, which may explain the failure of the right hand piston. They may have been used elsewhere before being fitted to this engine.

Nater_Potater · Dec 14, 2015

pierodn said:
Hi.
What do you think caused the rupture of the right piston?
Why were excavated on the barrells and on the gasket those rings?
Ciao
Piero

Normally, I'd expect those rings were from the PO laying soft copper wire around the pushrod holes to help seal against oil leaks. Was there any wire there when you disassembled the top end? If not, then maybe the PO re-used the head gasket and didn't bother with the wire the second time around. As for the cracked piston, you got me there! I'm used to seeing them lose the crown or scuff the skirt, but not crack through the center.

Nathan

texasSlick · Dec 14, 2015

Nater_potater wrote:

"Normally, I'd expect those rings were from the PO laying soft copper wire around the pushrod holes to help seal against oil leaks. Was there any wire there when you disassembled the top end? If not, then maybe the PO re-used the head gasket and didn't bother with the wire the second time around. As for the cracked piston, you got me there! I'm used to seeing them lose the crown or scuff the skirt, but not crack through the center."

+1 regarding the circles around the pushrod tunnels.

Regarding cracked piston: The crack appears to propagate right thru the gudgeon pin hole which signifies there was a large force on the gudgeon pin. The lack of an indentation on the piston crown rules out impact with a valve. What is left? .... detonation disorder? Hydro-lock?

Slick

The right rod should be carefully inspected to ensure it is not bent or warped.

pierodn · Dec 14, 2015

Madnorton said:
Left hand piston has impacted a valve - you can the the marks on the ridge of the cutaway in the segment marked LH. This alone suggests that the installation of the pistons and the fitting of the head etc has been completed by someone with no experience or even mechanically capable, which may explain the failure of the right hand piston. They may have been used elsewhere before being fitted to this engine.

Hi.
Not, the left piston do not has a scuff, is a dirty hard oil only.
Ciao
Piero

pierodn · Dec 14, 2015

texasSlick said:
Nater_potater wrote:

"Normally, I'd expect those rings were from the PO laying soft copper wire around the pushrod holes to help seal against oil leaks. Was there any wire there when you disassembled the top end? If not, then maybe the PO re-used the head gasket and didn't bother with the wire the second time around. As for the cracked piston, you got me there! I'm used to seeing them lose the crown or scuff the skirt, but not crack through the center."

+1 regarding the circles around the pushrod tunnels.

Regarding cracked piston: The crack appears to propagate right thru the gudgeon pin hole which signifies there was a large force on the gudgeon pin. The lack of an indentation on the piston crown rules out impact with a valve. What is left? .... detonation disorder? Hydro-lock?

Slick

Hi.
Left is good, only a dirty hard oil on.
See the other picture with the piston into the barrell, only dirty.
Ciao
Piero

1up3down · Dec 14, 2015

Madnorton stated:

Left hand piston has impacted a valve - you can the the marks on the ridge of the cutaway in the segment marked LH. This alone suggests that the installation of the pistons and the fitting of the head etc has been completed by someone with no experience or even mechanically capable, which may explain the failure of the right hand piston. They may have been used elsewhere before being fitted to this engine.

Piero, can you comment, reply to what is said above?

pierodn · Dec 14, 2015

1up3down said:
Madnorton stated:

Left hand piston has impacted a valve - you can the the marks on the ridge of the cutaway in the segment marked LH. This alone suggests that the installation of the pistons and the fitting of the head etc has been completed by someone with no experience or even mechanically capable, which may explain the failure of the right hand piston. They may have been used elsewhere before being fitted to this engine.

Click to expand...

Piero, can you comment, reply to what is said above?

Hi.
I dont know the history of this bike.
You can see the bike has a cutted timing side case and cover!!!!! never seen before an with no definitive explanation!
I have take the engine apart because i dont know what there was into!!!
I dont know if the left piston touched a valve, i cannot say.
Only one eye more expert than mine can argue this.
What is certain is that the rupture of the right piston is more worrisome.
But the Pistons protrude from the cylinder like x manual and the head is in stock ondition not skimmed neither the top of the barrells.
Why the valves had to touch the Pistons?
Perhaps for continuous detonations?
I do not know.
You know more of me.
Ciao
Piero

Madnorton · Dec 15, 2015

Piero,

On your very top picture, the piston has a valve pocket with LH cast in it, on the straight edge of that valve pocket you can see the the damage that has been left by valve impact.

pierodn · Dec 15, 2015

Madnorton said:
Piero,

On your very top picture, the piston has a valve pocket with LH cast in it, on the straight edge of that valve pocket you can see the the damage that has been left by valve impact.

Hi,
i mean.
So you think that the right piston was a valve impact too.
I believe in you.
Please, could you tell me why and when this happens?.
The pistons with gasket dont touch the head; cylinder and head are not skimmed.
Thanks.
Piero

Norton Follies!

Similar threads