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Gear oil help

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Gear oil help

Post  Martinrhyl on Wed Jun 22, 2016 5:59 pm

Francis barnett light cruiser 79 1958 amc 175,,,what gear box oil do I need also how much would I fail it up with as it is dry bone empty thanks guys
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Re: Gear oil help

Post  Ted Snook on Wed Jun 22, 2016 7:45 pm

Although people use all kinds of oils nowadays, including some very thin viscositys, I always use the oils recommended in the FB Handbook - in your case it's the same as the Falcon 199cc engine.
The Handbook states 1 3/4 pints of SAE50 oil from empty. Originally that would have been usually Castrol grand prix or similar mono-grade oil.
The level plug is just behind the Kickstart boss, on the centre line.
Although modern oils will work too, many are not designed to work where bronze bushes are used - they can attack the zinc in the bronze - at least that's the theory, also many modern oils leak too easily from traditional felt seals, because they are thinner.
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Re: Gear oil help

Post  Martinrhyl on Wed Jun 22, 2016 8:26 pm

Thank you very much
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Modern oils

Post  john87 on Thu Jun 23, 2016 5:18 pm

Hi there, The oil problem is to do with EP oils. NEVER EVER use EP oils unless specified by the makers. I know it is tempting to think they must be better, but the EP additives [mainly sulphur i believe] can and WILL attack any bearing metals with copper in them. The bearings will end up looking like they have been sand blasted. Not good at all.

This is not all "in theory" either, it WILL happen. Much the same problem is had with the selection of straight cutting oils for machine tools. Use the wrong one and it will attack and stain any "yellow metals" terribly!!!

john..

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Re: Gear oil help

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