VB piston missing a bit

pictures (or stories) of hideous injuries sustained by your ariel
klaus gerhard
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VB piston missing a bit

Postby klaus gerhard » Thu Apr 23, 2015 6:43 pm

I am in the process of preparing my recently purchased VB for the italian Rally next week. It started and ticked over yesterday but smoked heavily from the exhaust. I thought the oilpump is not pumping back to the tank propperly.
So I took the timingcover off to find many aluminium particles. Off with the sump plate to find even more and bigger aluminium particles. Then I decided to take the VB's barrel off to find a piston missing a bit. See the photos!

download/file.php?mode=view&id=6709
download/file.php?mode=view&id=6708

I had a word with our single spares organizer. Hope he can find me a nice replacement Piston.

Best regards
Klaus
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Kolben_2.jpg
Kolben_1.jpg

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paul.jameson
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Re: VB piston missing a bit

Postby paul.jameson » Thu Apr 23, 2015 8:55 pm

In my humble opinion, the piston might get you there but I would advise that it is distinctly life expired so should most certainly be replaced.
Paul Jameson
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), 54 4G Mk IV (project), Healey 1000/4 (project)
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Steven.Carter
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Re: VB piston missing a bit

Postby Steven.Carter » Fri Apr 24, 2015 6:58 am

Ouch, and was it still going! Brilliant

david.anderson
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Re: VB piston missing a bit

Postby david.anderson » Fri Apr 24, 2015 10:22 am

It certainly does make you wonder about thermal slot pistons. I have seen numerous failures, but the normal method if failure is for the top to come off the piston with a break extending horizontally from the thermal slots. Such failures are generally however in higher performing engines. I would not have expected a failure in the VB. The piston in my VB is a Hepolite T slot that came from Single Spares, ouch.
David

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john.nash
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Re: VB piston missing a bit

Postby john.nash » Mon Apr 27, 2015 3:26 pm

moving this to a "bad thing happened to my Ariel" .. for posterity
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1995 Thunderbird, 1980 Yamaha XS650, '67 CJ750, 196-ish Ural M62 outfit, ''51 kH500, '47 VH twinport, '44 Ariel WNG, '43 Ariel WNG, '40 Enfield WDCO and piles of rusty scrap ....

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Re: VB piston missing a bit

Postby Mike Nash » Mon Apr 27, 2015 9:21 pm

[img]
27april2015%20168.JPG
[/img]
Thought you might like to see another VB piston that did the same thing! It happened about 30 years ago, but I keep it as a souvenir! Like yours, it kept going but the bits of aluminium in the tank gauze filter alerted me.
Regards, MikeN.
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27april2015 168.JPG


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