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#5012 - 09/27/05 11:56 pm B31 Engine Oil  
Joined: Sep 2005
Posts: 4
Thommo Offline
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Thommo  Offline
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Joined: Sep 2005
Posts: 4
Ipswich Qld Australia
Hi all,
I've recently purchased a 51/52 Plunger B31. I don't know much about it or it's history, so I'd like to do a bit of a service on it. I don't know what grade of oil to use, so any advise as the what is required would be greatly appreciated.
I live in Queensland Australia, so things are going to be pretty warm here for the next 6 months, I expect that will influence my choice of oil.
Thanks

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#5013 - 09/28/05 7:11 pm Re: B31 Engine Oil  
Joined: Aug 2001
Posts: 6,878
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 6,878
scotland
If you can't find monograde 40, use 20W/50 multigrade.

These grades seem to be thick enough not to burn up into clouds of blue smoke in hot old engines.


Amateur Loctite enthusiast.
#5014 - 09/28/05 10:54 pm Re: B31 Engine Oil  
Joined: Sep 2005
Posts: 228
Melbourne Metisse Offline
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Melbourne Metisse  Offline
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Joined: Sep 2005
Posts: 228
Melbourne, Australia
G'day Thommo,
I know that this will raise a few hackles but I wouldn't be putting mono grade oil in ant bike. Have you seen how long it takes to pour when cold? I shudder to think how long it would take to get through tiny oilways and the damage that will occur in the meantime...
I'm based in Victoria so although we don't get your heat extremes, it still gets quite toasty so I use Penrite HPR40. It's a 25W-70 oil that has no friction modifiers (good for clutches!) that is designed for Aussie conditions

#5015 - 09/29/05 12:02 am Re: B31 Engine Oil  
Joined: Sep 2005
Posts: 4
Thommo Offline
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Thommo  Offline
BritBike Forum

Joined: Sep 2005
Posts: 4
Ipswich Qld Australia
Thanks All for your feedback,
I spent my early years in Victoria and know how hot it gets down there - it's just a different kind of hot. I'll give the HPR40 a go.

#5016 - 09/29/05 6:02 pm Re: B31 Engine Oil  
Joined: Aug 2001
Posts: 6,878
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 6,878
scotland
There's no such thing as 25w-70 oil over here in UK, but if there was, I'd probably try it.


Amateur Loctite enthusiast.
#5017 - 09/30/05 1:43 pm Re: B31 Engine Oil  
Joined: Aug 2001
Posts: 244
Phil in Germany Offline
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Phil in Germany  Offline
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Posts: 244
Duesseldorf/Germany
TT;
there is such thing in the UK too. Penrite has a branch in the UK.
Check out their website.

Penrite Australia

You have to look for their product information and then HPR oils. Their Australian website has more information than the English one.

Hope this helps and best regards

Phil


Best regards
Phil
Duesseldorf/Germany
'62 A 65 Star (disassembled)
'69 A 65 Lightning
'71 A 65 Firebird
'75 T 160
'84 Yamaha SR 500
#5018 - 10/01/05 7:06 pm Re: B31 Engine Oil  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,108
North Georgia, USA
The FIRST thing you want to do is disconnect the oil lines and put a high pressure hot water sprayer down in the tank. When this engine was first run there was nothing available but non-detergent oils. So there's about 3/4" of crud in the bottom of your oil tank. You have to get that out before running modern detergent engine oils, or they will circulate all that grit over and over until the whole thing is worn slap out.

Wouldn't be a bad idea to fit a small oil filter on the RETURN oil line if you have the money. One from a '75 Norton is easily had new from many Norton sources for under $40US.

On a tight engine a multi-grade oil would be best, but on one of unknown mileage I would tend to prefer a solid weight. Of course, with a solid weight you need to warm up the oil and be careful not to race the engine until you feel the tank start to warm. Also depends upon your driving habits and locale.

Drop by the local Harley shop and see what they use. Your engine oil needs would be much the same as a big H-D. Then go buy the equivilent at the local discount store!

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#5019 - 10/02/05 12:40 pm Re: B31 Engine Oil  
Joined: Aug 2001
Posts: 6,878
triton thrasher Online content
BritBike Forum member
triton thrasher  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 6,878
scotland
If you're going to clean the oil tank, make sure you do it right and get the inside completely spotless. Otherwise you'll do moe harm than good by disturbing the dirt.


Amateur Loctite enthusiast.

Moderated by  Allan Gill, Jon W. Whitley 


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