Author Topic: Oil leak from primary chain case  (Read 1243 times)

Online KiwiGF

  • Last had an A10 in 1976, in 2011 it was time for my 2nd one. It was the project from HELL (but I learned a lot....)
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Re: Oil leak from primary chain case
« Reply #15 on: 16.08. 2019 12:32 »

I suggested replacing the engine oil with some sort of coloured oil that would show up in the primary chaincase not knowing if anything like this is available that would suit an A series engine or any kind of dye that could be added to the existing oil.

For future reference does anyone know if either exists

Lawnmower oil sae 30 (made by Briggs and Stratton amongst others) is red and can go in the primary to show up leaks from there, but I find it goes blackish fairly quickly and is then tricky to tell from an engine/primary oil mix. Alternatively ATF can go in the primary, its red but it’s thin and makes leaks worse!

Edit: if the crankshaft oil seal has failed or has popped out of position then you will get pressure fluctuations in the primary case, some filler caps have small holes in, that will “show” this pressure, or one can remove the cap and see if it’s “puffing”.
New Zealand

1956 A10 Golden Flash (1st finished project)
1949 B31 rigid “400cc” (2nd finished project)
1968 B44 Victor Special (3rd project,in progress)
2001 GL1800 Goldwing, well, the wife likes it
2007 KTM 950 Adventure, cos it’s 100% nuts