Australian Olympic vs British Seagull AD102

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Charles uk
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Re: Australian Olympic vs British Seagull AD102

Post by Charles uk » Mon Mar 18, 2019 11:30 am

Spiro sorry more questions

Gudgeon pin diameter?
Olympic piston no circlips?
Olympic exhaust port bridged?
Spark plug 18mm x 1/2"?
Olympic piston OD at bottom of skirt?
Olympic piston ring pin positions?



Seagull piston ring pin position (3 o'clock & 9) on 60's piston.
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Re: Australian Olympic vs British Seagull AD102

Post by AusAnzani » Tue Mar 19, 2019 1:29 am

Charles uk wrote:Spiro sorry more questions

Gudgeon pin diameter?
Olympic piston no circlips?
Olympic exhaust port bridged?
Spark plug 18mm x 1/2"?
Olympic piston OD at bottom of skirt?
Olympic piston ring pin positions?

Seagull piston ring pin position (3 o'clock & 9) on 60's piston.
lol, as expected Charles. Will respond tomorrow aye!

Regards,
Spiro

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Re: Australian Olympic vs British Seagull AD102

Post by AusAnzani » Tue Mar 19, 2019 1:39 am

Collector Inspector wrote:The ring gaps..........totally incorrect I am afraid.

Such as those indicates at the very least ring breakage under load.

That is if the poor things actually run.

I suggest revisit?

Cheers

BnC
Measurements are correct, hence the inclusion of the feeler gauge in the images. Ring breakage is more common when the gaps are under rather than over-sized, but yeah, I agree those gaps are ridiculously large.

As said above, will drop rings from # 103 in to the barrel of # 276 and re-measure. The barrel then becomes the common for comparison purposes.

Also as said earlier, locating/stop pin sits centrally in the ring groove, therefore the ring gap will be much bigger than standard for a Seagull on which, the pin is offset sitting half in, half out of the ring groove.

Regards,
S

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Re: Australian Olympic vs British Seagull AD102

Post by AusAnzani » Tue Mar 19, 2019 1:50 am

Collector Inspector wrote:S

Braved the red-backs and the smell of mice! I will shut Cello in the back shed overnight with a bowl of water and no dinner. No litter tray either because that will piss her right off........goodby rodents.

OK

Main Tank Sticker is 85 x 57mm.

20190318_144606_HDR[1].jpg

Lubrication sticker is 84 x 32mm

20190318_144536_HDR[1].jpg

I had a good look for an engine number (or any number at all) and nothing.

The cases, gearbox and pump housing have no paint at all. Bare cast aluminium. The gear box and pump housing have been linished but not looking "Polished" sort of deal. The transom clamps have frosted over bronze.

20190318_144700_HDR[1].jpg

The colour is indeed Green under which has the yellow primer we all know so well.

There is the usual red lead primer under black on the barrel..........No sign of any plating.

Please share these pics mate. On Yr Group etc.

Cheers

BnC

You will have to send Tiller over so I can get a good color match on the tank and decals lol.

Interesting about the other parts. # 103 and # 276 had paint on the crank case assemblies and ignition plates. # 103 also had paint on the water-pump housing and gearbox, # 276 did not.

# 103 & # 276 had unpainted fuel tank mounting brackets and transom clamps. Both are painted on Tiller.

Inconsistencies like this add complexity to any 'restoration'. Renovations are therefore often much easier.

Regards,
Spiro
Last edited by AusAnzani on Wed Mar 20, 2019 1:30 am, edited 1 time in total.

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Re: Australian Olympic vs British Seagull AD102

Post by Collector Inspector » Tue Mar 19, 2019 2:15 am

A chicken is one egg's way of becoming others

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Re: Australian Olympic vs British Seagull AD102

Post by AusAnzani » Tue Mar 19, 2019 7:31 am

Can you imagine how difficult it would be to measure and file some of those profiles?

Heading home soon to take a few more pics and measurements.

Regards,
Spiro

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Re: Australian Olympic vs British Seagull AD102

Post by Collector Inspector » Tue Mar 19, 2019 8:13 am

HA!

Small file and wee jaw vice, a bright light (Sunshine works a treat here) and dexterity......................oh and some practice of course.

Start with the new ring to suit the piston O.D. and, depth width profile.

Away ya go.

This one needs a ring gap and clearance rebated around the pin ever so slightly extra.

The rings you have shown are obviously a replacement as not the above done.........and again, there will be broken rings because of that.

Before you begin check the seating of the pin in that it is just smidge (technical term) less than 1/2 proud of the land base............tap it in to achieve that.

A pic of the inside would be interesting in regards to that aye.

Cheers

BnC
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Re: Australian Olympic vs British Seagull AD102

Post by Charles uk » Tue Mar 19, 2019 9:28 am

Before you go anywhere near that ring with a file.

Gap it again when it's in the right location, 5 mm above the exhaust port, push it into that position with the skirt of a piston, to ensure squareness.

Measure again.

The previous position was good enough to show that the bore diameters were different.
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Re: Australian Olympic vs British Seagull AD102

Post by Collector Inspector » Tue Mar 19, 2019 9:52 am

Read the posts again Charles.

BnC
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Re: Australian Olympic vs British Seagull AD102

Post by Collector Inspector » Tue Mar 19, 2019 10:05 am

As discussed S.

Nearly ten years ago.......time just gets away aye!

The spares A and B are different heights.

https://www.youtube.com/watch?v=OqDrJBywtpk

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Re: Australian Olympic vs British Seagull AD102

Post by Charles uk » Tue Mar 19, 2019 10:32 am

Now that paints a really good picture thanks!

I've only seen 1 or 2 of these, 1 in Melbourne willie, days before the millennium & the other in towomba (don't think I spelled that right) & wasn't allowed a spanner attack.
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Re: Australian Olympic vs British Seagull AD102

Post by Collector Inspector » Tue Mar 19, 2019 11:09 am

No way any hoo you would be given any opportunity to wield a spanner on Down Under technology relating to this sort of thing!

Mate!

The spanner would be spun, the pictures and tech done and you would use RTV to hide your Blimey handy work after.

Good thing you did not get a chance I say.

Then we just continue as normal S?

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Re: Australian Olympic vs British Seagull AD102

Post by Charles uk » Tue Mar 19, 2019 12:00 pm

The anal bit is in my genes Bruce, If I did one of those DNA things, they would find an awful lot of POM in there!

I've found my 30 thou oversize piston can't find the 10+ & the boxes & rings, but the ring pins are in the Seagull position.
IMG_8915 oversize piston.jpg
The skirt diameter measures 57.47 mm

A new seagull 56.73 mm
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Make it idiot proof and someone will make a better idiot.

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Re: Australian Olympic vs British Seagull AD102

Post by AusAnzani » Wed Mar 20, 2019 1:09 am

Charles uk wrote:The anal bit is in my genes Bruce, If I did one of those DNA things, they would find an awful lot of POM in there!

I've found my 30 thou oversize piston can't find the 10+ & the boxes & rings, but the ring pins are in the Seagull position.
IMG_8915 oversize piston.jpg
The skirt diameter measures 57.47 mm

A new seagull 56.73 mm
Thanks for sharing Charles. I'm not convinced that +30 piston is from an Olympic. The castings looks different. Could you please post of pic of the ring pin please? I would like to see where it sits in the groove. Also a pic from the underside of the piston to see if there are through holes or fixed castings for the ring pin.

To your previous questions, please see post below.

Regards,
Spiro

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Re: Australian Olympic vs British Seagull AD102

Post by AusAnzani » Wed Mar 20, 2019 1:28 am

Gudgeon pin diameter?
IMG_6945_R.jpg
Olympic piston no circlips? Yes, on both sides of course.
IMG_6946_R.jpg
Olympic exhaust port bridged? Yes, refer previous pics inside barrel. You may need to brighten them up a little to see more clearly.

Spark plug 18mm x 1/2"? Yes, sames as AD 102. Confirmed by fitting the same spark plug to Olympic and BS Ad 102 barrel.

Olympic piston OD at bottom of skirt? Sorry, didn't realise you were going to provide metric measurements. Seagull piston had a slightly smaller OD but it looks like I have accidentally deleted that photo.
IMG_6941_R.jpg
Olympic piston ring pin positions? Same positions as Seagull. Pic below, from top to bottom Olympic # 276, Olympic # 103 and Seagull AD 102 (early 50's)
IMG_6947_R.jpg
Charles, I should say the battery on my vernier is on its way out, reflected by display cycling on off on off etc. Usually when this happens, the measurements taken can be slightly out. Just a point to note.

Now I have some questions. Next post aye!
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