Author Topic: Oil pump O rings  (Read 1675 times)

Offline Bryanj

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Re: Oil pump O rings
« Reply #15 on: April 20, 2017, 05:32:09 AM »
That sounds like the same size as the 500/550 one

Offline Nurse Julie

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Re: Oil pump O rings
« Reply #16 on: April 20, 2017, 10:27:32 PM »
Oil leak all sorted........at last. 18 month ago I noticed a few drops of oil on the floor which had been running down the side stand. I looked everywhere for where the leak was coming from and came to the conclusion it was the sump gasket so I changed it but still had a leak. Last summer the leak got worse, investigated again and firstly changed the gear change lever seal, still leaked, so changed the starter motor O ring.......still an oil leak, so changed the sump gasket again as there was always oil along the line of the sump....still leaked, but alot worse now. Only thing left on that side at that level was the oil pump. Took it apart and every O ring was hard, brittle and squashed flat. All new O rings fitted......bingo, dry as a bone at last.
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Offline Trigger

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Re: Oil pump O rings
« Reply #17 on: April 20, 2017, 10:30:51 PM »
WAIT until you refill with oil .

Offline hairygit

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Re: Oil pump O rings
« Reply #18 on: April 20, 2017, 10:32:15 PM »
WAIT until you refill with oil .
I can see someone getting laxatives in their next meal..........

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Offline Nurse Julie

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Re: Oil pump O rings
« Reply #19 on: April 20, 2017, 10:34:56 PM »
Err, you mean the meal he has just eaten  ;D ;D ;D ;D
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

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Offline Dave487

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Re: Oil pump O rings
« Reply #20 on: April 24, 2017, 09:15:41 PM »
I recently ordered the following from Mayday Seals after a bit of investigation from this forum and some guestimates

 7 mm x 1.5 mm O-Ring - Material : Nitrile 70 3 off
16 mm x 2.5 mm O-Ring - Material : Nitrile 70 2 off
27 mm x 2 mm O-Ring - Material : Nitrile 70 1 off
41 mm x 2 mm O-Ring - Material : Nitrile 70 1 off
63 mm x 2.5 mm O-Ring - Material : Nitrile 70 1 off

They all seem to fit ok when I re-assembled the pump but I haven't run the engine yet so not checked the pressure or for leaks.
 


Offline Nurse Julie

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Re: Oil pump O rings
« Reply #21 on: April 24, 2017, 10:01:35 PM »
Agree with the 7mm x 1.5mm,  63mm x 2.5mm and 27mm x 2mm.........but I put different size O rings in to the others you mention. All viton. Mine is up and running, with good pressure and no leaks.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

 

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