Gauze filter or not in sump plug ?

Hendo · Jun 17, 2023

Hi All,

Interested to know if the Gauze filter in large sump plug of my 850 is needed, When I purchased the bike years ago it never had the gauze in place and I haven't bothered to replace it,I think the spin on filter and regular oil changes will suffice and the flimsy looking circlip holding the gauze in doesn't look that secure !
So should I reinstall the gauze, yeh or nah ?

Cheers Hendo

cash · Jun 17, 2023

It stops any big bits destroying the oil pump.

kommando · Jun 17, 2023

@cash plus 1, the only Commando without a gauze is the 72/73 750 and these have issues with the oil pump return teeth being mashed up by large debris.

Hence my mod to some 72 cases

72 crankcase mod to add sump filter

The 72 cases were a backward step, the removal of the sump filter was the worst part of this. The current recommended mods cure the issue with the forward sump pickup not working at high revs by changing the location to the back. The lack of a sump filter can be partially covered by drilling a...

www.accessnorton.com

KiwiShane · Jun 17, 2023

kommando said:
@cash plus 1, the only Commando without a gauze is the 72/73 750 and these have issues with the oil pump return teeth being mashed up by large debris.

Hence my mod to some 72 cases

72 crankcase mod to add sump filter

The 72 cases were a backward step, the removal of the sump filter was the worst part of this. The current recommended mods cure the issue with the forward sump pickup not working at high revs by changing the location to the back. The lack of a sump filter can be partially covered by drilling a...

www.accessnorton.com

Nice work

SteveA · Jun 17, 2023

Judging by the crap caught in my sump plug gauze over the years....you will have had some nasty stuff go in your oil pump!

The flimsy circlip does the job fine, if you make 100% sure it is properly located.

YING · Jun 17, 2023

SteveA said:
Judging by the crap caught in my sump plug gauze over the years....you will have had some nasty stuff go in your oil pump!

The flimsy circlip does the job fine, if you make 100% sure it is properly located.

Like SteveA says,I would not hesitate and put that screen in ASAP.Anything that helps these old motors filter out debris is a plus.Just my 2 cents

KiwiShane · Jun 17, 2023

The stock sump plug also provides a good wee spot to add some extra magnetic filtration with a disc magnet under the gauze in the bottom of the plug ...similar to these Neodymium rare earth magnets that I've used....just a thought...

L.A.B. · Jun 17, 2023

KiwiShane said:
The stock sump plug also provides a good wee spot to add some extra magnetic filtration with a disc magnet under the gauze in the bottom of the plug ...similar to these Neodymium rare earth magnets that I've used....just a thought...

Or:

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.

andover-norton.co.uk

SteveA · Jun 17, 2023

L.A.B. said:
Or:

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.

andover-norton.co.uk

There are two aspects of this part.

I have one but because it seemed a good idea, but I don't use it because I found that my race fairing doesn't have clearance for it! This won't affect most Commandos, but it may affect some.

You can release the magnetic plug and drain the sump of oil, (handy for a wet sumped engine) but you might then persuade yourself there is no need ever to remove the big plug and the gauze and clean that of non-magnetic particles!

Tornado · Jun 17, 2023

The gauze on mine has had bits of carbon caught in it in the past so, yes it does its job.
Shortly after fitting a magnetic sump drain bolt ( the one rearward of the gauze filter sump plug), I found a segment of a mangled rocker spindle thackery washer attached to it. Never found the rest of that washer after strip down. Could have been in there from factory I guess.

EstuaryBoy · Jun 17, 2023

Is it my ageing imagination, or did I once read the recommendation of soldering that wire circlip? Not to excess, of course.......
(Found it!! Dunstall Tuning Notes

)

L.A.B. · Jun 17, 2023

EstuaryBoy said:
or did I once read the recommendation of soldering that wire circlip?

Yes, you did.

Matchless · Jun 17, 2023

I've never had a circlip move in all the time I've been running Norton twins. These bikes maybe a a bit prehistoric, but the blokes who designed them weren't idiots.

Hendo · Jun 17, 2023

Thank you for all the replies ..... I better get the gauze in soon as

ntst8 · Jun 17, 2023

Hi Hendo,
You now have an opportunity to display whether "the affliction" has fully taken hold.
You could spend very little and just fit the gauze, spend a bit more and get the Andover bit above, or go full noise and get the NYC Norton filter with integral reed valve etc.
I have the NYC one, but i have been beyond help for years

Hendo · Jun 17, 2023

Hi Iain,

I'll have to wait till after scanning this week to let me know how much of a potential natural increase in lamb numbers we have this yr to pay for the cost of getting that over from the States

...it's tempting tho !

Hendo

KiwiShane · Jun 17, 2023

I stuck one of these in my oil tank along with a magnetic drain plug after fitting the NYC sump breather as the ejected oil via the breather bypasses the oil filter...anal I know

marshg246 · Jun 17, 2023

KiwiShane said:
I stuck one of these in my oil tank along with a magnetic drain plug after fitting the NYC sump breather as the ejected oil via the breather bypasses the oil filter...anal I know

Since it shouldn't hurt anything, and it makes you more comfortable then it's a good thing. However, the oil leaving the tank is quite far from the bottom of the tank and anything heavier than oil will settle at the bottom. Personally, putting a loose magnet in the crankcase would worry me but I guess captured in the sump plug is safe.

marshg246 · Jun 17, 2023

Hendo said:
Hi Iain,

I'll have to wait till after scanning this week to let me know how much of a potential natural increase in lamb numbers we have this yr to pay for the cost of getting that over from the States ...it's tempting tho !

Hendo

How many lambs will it cost and how many lambs to cover the cost of shipping? The barter system is sounding good considering the economy today

Hendo · Jun 17, 2023

As an exporting national particularly with ag products we are at the wim of our trade partners but at the end of the season ( now ) as meat companies are having a procurement battle the price per kilo is around $7.60 kg- $7.90 kg paid to sheep farmers .We average around 19 kg for our lamb,Less costs obviously ... NZ inflation is around 6.7%, farm inflation is around 16-17 % so there ain't much left over for a NYC sump filter !
Barter is good....anyone ?

Gauze filter or not in sump plug ?

Hendo

cash

kommando

72 crankcase mod to add sump filter

KiwiShane

72 crankcase mod to add sump filter

SteveA

YING

Pittsboro,NC

KiwiShane

Attachments

L.A.B.

Moderator

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

SteveA

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Tornado

EstuaryBoy

L.A.B.

Moderator

Matchless

Hendo

ntst8

Hendo

KiwiShane

Attachments

marshg246

marshg246

Hendo

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