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cruiser 80 clutch oil...

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cruiser 80 clutch oil...

Post  Colombia on Tue Aug 08, 2017 11:21 pm

Hi
Gear selection on my 1957 Cruiser 80 is very clunky when the bike is cold, but ok when the engine is warmed up. So I think it may be due to the thickness of the oil I have in. Do you think this could be improved if I used automatic transmission fluid instead of SAE20? If so is there any particular type I should use?
Thanks in advance for any help.
Michael

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Clutch oil

Post  kerabo on Wed Aug 09, 2017 7:29 am

Give it s try. Several use it including myself.
Any ATF or power steering oil should do.

Ken
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clutch oil

Post  Colombia on Wed Aug 09, 2017 9:04 am

thanks for reply Ken

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automatic transmission oil

Post  piston 197 on Wed Aug 09, 2017 10:56 am

Use ATF or TQF in the clutch only, not the gearbox, the gearbox oil can be a car grade 20/50 which will act thinner when cold than a straight SAE20

JH
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piston 197
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Oil

Post  john87 on Wed Aug 09, 2017 6:47 pm

My manual says straight 30 in both... have i bought the wrong oil??

john..

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oils and lubrication

Post  piston 197 on Wed Aug 09, 2017 7:05 pm

Things have moved on somewhat since your manual was written , Straight 30 is still ok, but clutch plates tend to stick together if not used regularly with the thick straight 30, so nowadays ATF or TQF automatic tranny fluid is the choice.
Straight 30 is OK in the gearbox as well, but a modern 20/50 or 15/40 will act thinner when cold and act as a thick oil when warm , ie. it alters according to temperature whereas the straight 30 stays much the same all the time.

At the end of the day, when FB were recommending straight 30 people were using their machine every day in all weathers and it coped, but if I was using it as a "leisure/occasional machine I would be putting ATF in the clutch. I campaigned Villiers engine trials bikes from late 80's to mid 2000's and always used ATF, and a trials bike gets a lot more abuse than a road bike, particularly slipping the clutch in sections to find grip, I never had any problems with the clutches.

JH
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piston 197
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oil

Post  john87 on Wed Aug 09, 2017 7:41 pm

Wonder what would happen if you put hydraulic oil in the gearbox?? It withstands shear in a big way, is anti foam, anti corrosion and god knows what else.. It is recommended for my lathe headstock so it cannot be "EP" but must be good as gear oil!!

john..

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oils and lubrication

Post  piston 197 on Wed Aug 09, 2017 8:02 pm

When we were kids ( about 14) we had a 350cc Matchless field bike that was low on oil, we found a 5 gallon tin of oil in the farm tractor-shed and pinched a couple of pints, it was hydraulic oil for the tractor front loader. It was like chucking wet grass on a fire, when we went up our usual track , we could not see to come back down until the smoke had cleared. Not sure what it would do in a gearbox, but no use in a 4 stroke oil tank !
JH
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oils and lubrication

Post  seipgam on Thu Aug 10, 2017 5:58 am

Take the advice of people who know - the ones that have been doing as they have said for years.
What would be recommended now is vastly different to what was available back then.

Cheers, Geoff.
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