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[EnfieldbangDK]

Cheers from the Kingdom of Denmark:

I own a 1957 350 Bullet and last Summer I experienced at loud "puff" and I noticed that the rubber gasket in the primary drive chain case had come out through the top of the chain case.

I Thus Wonder what the problem can be - Bonus info:

During 2012 I must have been doing the same without me being able to locate the defect.

The engine is warm and the speed last Summer was abt. 30 mph. driving steadily...

I am yet to check the "duck-bill" breather for any blockages.

Thanks in advance for your take on this.

Best regards

Peter

[Barry_Q]

This is a bit of a new one on me. The only possibility is that the primary chaincase got pressurised somehow. The only thing I can think of is that crankcase pressure got past the main bearing seal somehow.

[PeteF]

Case must have been loose or warped. Any normal pressure breathes through the small hole in the oil filler cap. That O ring is normally pretty well restrained by the deep grove it sits in.

[Exile]

That sounds new and exciting... Let us know if you figure out what did it.


Where are you in Denmark? I'm in Kastrup, deepest Amager.

[EnfieldbangDK]

Thanks for your prompt postings - much appreciated.

On the subject of pressure getting by the main bearing seal: Is there a washer there to avoid just that?

@ my Fellow Dane: I am located in Gl. Holte - Lets meet up one day for some "Good Vibrations": Phone Number 41 25 10 07.

Cheers: Peter

[Exile]

Peter: Gl. Holte..? Not a million miles away. I'm up for a pint. 32 52 47 15. As soon as I've got Thumper back on the road, I'll be in touch.

[EnfieldbangDK]

Hi Exile:

Sounds great - Bakken opens on 27.03.14 - Have participated before and would indeed welcome a Fellow RE rider...
we will stay in touch and happy preparing for the 2014 season.

C U: Peter