Small block bevel drive - temperatures |
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Simmoto
Senior Member Joined: 29 Jul 2017 Location: Aberdeenshire Status: Offline Points: 261 |
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Posted: 06 Oct 2018 at 16:18 |
I recently changed the inner and outer oil seals in the Lario bevel box. No oil leak so a bit of a sucess - tip for anyone doing this the large inner seal seems to leak most often and the cause is quite often corrosion on the hollow shaft it rubs against so if changing this seal check the contact area for rust and remove with fine wet and dry (I used 400 grit).
Anyway, I digress. When I went for the first ride I obviously looked for leaks and this involved prodding about at the bevel and disc. The bevel housing gets pretty warm but I can hold my hand against it no problem. The disc gets pretty hot. I reckon between 50 and 70 Celsius depending on how spirited my riding is. I believe most of this heat is conducted from the bevel drive. There is no binding of the brakes; the wheel turns freely. This may be normal - I didn't ever touch my rear disc after a ride before fitting the new seals. The front discs are pretty cool by comparison. Is this normal? If not I will take the bevel off again and investigate. Only thing i can think of is i forgot is to repack the big roller bearing with fresh grease - but not did I clean it out with solvent etc. I used 150ml of 140/85W GL5 and 20ml of moly So, small block owners how hot does you rear disc and bevel housing get? Thanks |
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rapheal
Senior Member Joined: 13 Nov 2014 Location: west country Status: Offline Points: 573 |
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after a run mine was warm to the touch, you need some heat build up to prevent moisture forming and corroding the internals, people who do lots of short journeys seem to suffer this problem
I have the drive box oil changed one very service its cheap much cheaper than a bearing
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Simmoto
Senior Member Joined: 29 Jul 2017 Location: Aberdeenshire Status: Offline Points: 261 |
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Yeah I figure its normal: in the same ballpark as some US owners who measured the temps of a range of Guzzis after a run. Cheers
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nab301
Senior Member Joined: 29 Oct 2017 Location: Dublin Ireland Status: Offline Points: 443 |
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Not sure if my Breva 750 is a similar set up but since purchase I was convinced the rear brake was binding , I rebuilt it to be sure but the rear disc still gets hotter than any other bike I ride. Maybe i'll get a chance to play with my new infra red thermometer and post up the results !
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Nigel
Keep smiling , it makes people wonder what you've been up to! '19 CB125F, '18 DL250 SUZUKI V STROM,'99 Bmw R1100S, '03Bullet 65 500, '93 MZ301 Saxon fun (offroad) |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Rear disc has least air flow over it thus it will retain its heat for longer
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Motty
Senior Member Joined: 03 Jun 2015 Location: South England Status: Offline Points: 269 |
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I'm another "rear disc runs hotter than expected and no it isn't binding"
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It’s more fun to try to ride a slow bike fast .....
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Simmoto
Senior Member Joined: 29 Jul 2017 Location: Aberdeenshire Status: Offline Points: 261 |
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thanks chaps all good teSsuring stuff. Yeah id like to try an IR thermometer out of interest too
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nab301
Senior Member Joined: 29 Oct 2017 Location: Dublin Ireland Status: Offline Points: 443 |
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Pulled bike out of a cool overnight garage rear disc 12 deg C, air temp 10 deg C, On board temp reading 50deg F Completed 20 mile motorway journey with no use of the rear brake in the last 10 miles and only light use of the front brake. Rear disc 17 deg c ( cold to touch ) Front disc light use 25 deg C ( luke warm to touch) Bevel box casing 50 deg C (quite warm..) Exhaust headers near cylinder head 110 deg C Completed an urban type run using both brakes but not excessively Rear brake 50 deg C ( ouch to touch!) Front brake 35 deg C ( warm but not burning to touch) Bevel box casing 35 deg C Exhaust headers 135 deg C Obviously in summer temps everything would have been much hotter HTH Edit , 75w 140 oil in bevel box Edited by nab301 - 15 Oct 2018 at 20:58 |
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Nigel
Keep smiling , it makes people wonder what you've been up to! '19 CB125F, '18 DL250 SUZUKI V STROM,'99 Bmw R1100S, '03Bullet 65 500, '93 MZ301 Saxon fun (offroad) |
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Scousus maximus
Senior Member Joined: 28 May 2014 Location: Teesside Status: Offline Points: 263 |
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Good info there Nigel, thanks for sharing. Regards, John
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2012 V7 Stone
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Simmoto
Senior Member Joined: 29 Jul 2017 Location: Aberdeenshire Status: Offline Points: 261 |
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great info, thanks for that. The rear disc just gets pretty warm then. Exhaust headers get bloody hot! I agree and have the scars to prove!
Cheers
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Bugsy
Falcone Joined: 08 Oct 2018 Location: N Status: Offline Points: 66 |
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As a (related) aside, Simmo in his OP, tells us that he used 85W 140 plus moly in his bevel box. I wonder, could others who commented above say what they use? Could it affect temperatures?
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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A cheap infra-red (IR) thermometer is a useful tool.
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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I use a good quality 85/140 oil plus moly but not convinced that modern day oils need the additive, so once my can of moly has gone then I shan`t bother replacing it. The moly is an old habit I`ve never broken but reality is that oil technology has moved on, maybe it`s time I moved on with it.
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Motty
Senior Member Joined: 03 Jun 2015 Location: South England Status: Offline Points: 269 |
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85/140 + moly here
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It’s more fun to try to ride a slow bike fast .....
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Bugsy
Falcone Joined: 08 Oct 2018 Location: N Status: Offline Points: 66 |
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Ahh, the moly word again! I asked about this in another thread and it still seems popular even though Guzzi themselves don't mention it at all now.
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