PX 150 clutch side seal
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PX150E
Joined: 03 Jun 2019
Posts: 4
Location: greece
Mon Jun 03, 2019 1:50 am quote
Hi, I am having a problem with my crankshaft seal on the clutch side.It keeps popping out and i cant figure out why. Its the second time in a month. I am thinking of putting glue but not sure its a good idea, and not sure it will be a long term fix. My question is since i am going to repair what to look for to pinpoint the problem.

Thanks
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1182
Location: UK (South East)
Mon Jun 03, 2019 3:01 am quote
Do you find it's easy to install your seals? Which type are you using, metal or rubber? I find that the metal ones are such a tight fit that pulling them out is not easy, let alone them falling out of their own accord. I use Loctite 603 just for reassurance.
Lurker
PX150E
Joined: 03 Jun 2019
Posts: 4
Location: greece
Mon Jun 03, 2019 3:08 am quote
I use the metal type and yes it has a tight fit, thats why I find it unusual to pop out for the second time. Loctite will be my next move hopping it will be a long term fix. I also found this video searching the forum, it looks like a fix but not sure.

Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1996 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1584
Location: Veria, Greece
Mon Jun 03, 2019 6:43 am quote
Newer Corteco metal seals are thicker and if you install them flush to the casing, they rub on the crank bearing, rotate and pop out. You either grind it like in FMP's videos or make a tool like I did, to let it protrude 0.5mm when installed...
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PX150E
Joined: 03 Jun 2019
Posts: 4
Location: greece
Mon Jun 03, 2019 6:54 am quote
thanks , very helpful
Molto Verboso
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 1459
Location: London UK
Mon Jun 03, 2019 7:19 pm quote
The Malossi metal seal is more expensive but goes in tight and doesn't touch the bearing. If the seal has fell out a few times Loctite 638 will hold better, same stuff as 603 just thicker.

Last edited by Jack221 on Sun Jun 23, 2019 9:26 pm; edited 1 time in total
Lurker
PX150E
Joined: 03 Jun 2019
Posts: 4
Location: greece
Tue Jun 04, 2019 1:55 am quote
Thanks for the info Jack221
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1182
Location: UK (South East)
Fri Jun 07, 2019 4:37 am quote
I've just been measuring with a set of verniers and I'm of the opinion that an off the shelf Corteco seal (blue or brown) cannot make contact with the bearing, at least on my engine.

The bearing retaining circlip sits 5mm below the surface of the crank case. The edge of the Corteco seal is 4.2mm in thickness. If the seal is flush fitted, it would be ~0.8mm shy of the circlip. The total thickness of the seal is ~5.5mm thick, taking into account the drop towards the centre of the seal. A new circlip is 2.1mm thick, therefore a flush fitted seal could never make contact with the bearing, as there is at least 7mm total clearance between the bearing and the surface of the crankcase, for a seal that is only 5.5mm thick.

Am I talking sense (for once)??
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