Author Topic: Oil change then it leaks!  (Read 954 times)

Offline Stu55Flash

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Oil change then it leaks!
« on: 28.06. 2011 23:52 »
I was really pleased with my plunger flash until I changed the oil from Commer SAE30 to SAE40 no leaks before then blowing out the breather over the rear tyre.
Anyone else had this problem? Any ideas or should i just change the oil back again?

From here things got worse. She kicked back at me and I strained a tendon in my knee. Absolute agony! She is not happy with me.

"Keep a distance from lady "L" drivers in cars. Some are not mechanically minded, are slow to acquire road sense, an are apt to panic..." The Pitman Book of the BSA Twins.
Golden Flash Plunger 1955, Francis Barnett Falcon 67 1954, Ferguson TEA Tractor 1951. Looking for another project!

Online orabanda

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Re: Oil change then it leaks!
« Reply #1 on: 29.06. 2011 01:03 »
Don't panic (yet!).

My tip is that you overfilled the tank (perhaps some oil left in the crankcases?), and the oil level has risen too high in the tank. If this happens, it WILL come out of the breather tube!.

Re-check the oil level; if it is too high (or even high), drain a bit out, and see how it goes.


Offline A10Boy

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Re: Oil change then it leaks!
« Reply #2 on: 29.06. 2011 10:50 »
I'm not familiar with the plunger oil tank level, but i've seen many restored SA A10's with the "oil Level" transfer fitted way too high, like up at the neck. They should be around 3 inches down from the cap. maybe worth checking on your bike?



1958 Super Rocket
Harley Super Glide Custom
Yam XJR 1300

Offline brackenfel

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Re: Oil change then it leaks!
« Reply #3 on: 08.07. 2011 13:27 »
I use Morris SAE40 in my s/a Flash with no ill effect so I wouldn't think it's the oil viscosity.. I've probably got it a bit too full at present as well but it still doesn't blow..

Hope you find the cause..
1961 A10 650 Golden Flash - Blue
1954 BSA B33
Velocette Viper
Laverda 750 SF1
Kawasaki W650
Buell XB9S
Ariel 350NH & Matchless G3LS in bits...