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Offline cat10

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Leaking oil filler cap.
« on: June 12, 2020, 06:50:13 PM »
Hi Guys, just been out for a spirited  100 miler and noticed oil dribbling out of the oil filler cap.
Cap is nice and tight and the o ring looks fine.
Has anybody else suffered from this problem.

Online KildareMan

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Re: Leaking oil filler cap.
« Reply #1 on: June 12, 2020, 07:15:22 PM »
Are you sure you've not cross threaded the cap onto the case?
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Offline cat10

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Re: Leaking oil filler cap.
« Reply #2 on: June 12, 2020, 08:19:32 PM »
*Originally Posted by KildareMan [+]
Are you sure you've not cross threaded the cap onto the case?
Thread is perfect, not cross threaded  cap is done up hand tight.
Might have to try a new o ring...

Offline K1W1

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Re: Leaking oil filler cap.
« Reply #3 on: June 13, 2020, 01:11:35 AM »
So the possible causes could be (discount those not applicable)
Lose filler cap
Cross threaded filler cap
Worn O ring meaning no correct seal
Split oil residue from the last oil change that was not noticed until it got hot and ran down the side of the case
Overfilled oil causing too much pressure inside the engine and the pressure being released through the weakest place, the cap
Some other issue with the engine (blown seals probably) causing the engine to pressurize as above.

Offline Bladerunner99

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Re: Leaking oil filler cap.
« Reply #4 on: June 13, 2020, 08:34:32 AM »
Check the crank case breather!
Ride to work. Work to ride

Offline Stevie.P

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Re: Leaking oil filler cap.
« Reply #5 on: June 13, 2020, 12:24:51 PM »
Was it quite tight screwing it down from the start? The 1st time I needed to open my filler cap (after 3 dealer services and doing 1st own oil service last September) I had a battle unscrewing it (had to use pliers) and on replacing found it went in so tight it stopped before fully in on the O ring. Checked the threads in case and on cap suspecting dealer had cross threaded but found no signs of damage. Luckily I still had the cap from my previous Street Triple, having fitted red cap and dipstick, and thought I'd try that and found that one went straight in and as I would have expected with only expected light finger force to fully seat down. :027:
Also owned my 1979 Bonnie T140E from new!

We don't stop playing because we grow old .. WE GROW OLD BECAUSE WE STOP PLAYING!!!


 


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