[Healeys] Loud Metallic Click

Dave Porter frogeye at porterscustom.com
Sun May 29 07:24:08 MDT 2011


..now it will be interesting to learn if it was merely metal fatigue or from
running too much ignition advance. 
Dave
PS you should be able to tell by the edges of the metal.
Sharp/jagged=fatigue or rounded/melted= preignition

frogeye at porterscustom.com

Porter Customs   2909 Arno NE
Albuquerque, NM USA 87107
505-352-1378
1954 BN2  1959 AN5
Porter Custom Bicycles

cars:
 www.britishcarforum.com/portercustoms.html
gallery:
http://picasaweb.google.com/porterscustombicycles/PorterCustomBicyclesStuff

GO HERE: http://porterbikes.com/  nice pictures-fun facts-my world

-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Patrick and Caroline Quinn
Sent: Sunday, May 29, 2011 5:12 AM
To: 'Patrick and Caroline Quinn'; healeys at autox.team.net
Subject: Re: [Healeys] Loud Metallic Click

G'day

Listers would recall the loud and expensive noises coming from the engine of
the BN3/1.

The engine is still in the car, but everything hanging off it has now been
removed. Yesterday my eldest son and I removed the cylinder head. It was a
struggle, but once the overdrive throttle switch was removed it was possible
to lift the head, move it sideways and then away from the engine.

At first glance everything appeared as it should be, but looking more
closely today, a 12mm by 5mm piece from the edge of the crown of the No 2
piston was missing. Small bits of aluminium were embedded in the top of the
piston and minor damage was evident in the combustion chamber. The top
compression ring was intact hence the smooth but noisy running.

Watch this space.

Hoo Roo

Patrick Quinn
Sydney, Australia

  
On 4/23/11, Patrick and Caroline Quinn <p_cquinn at tpg.com.au> wrote:
> G'day
>
>
>
> Here is something to get your collective minds around.
>
>
>
> Yesterday morning we were 560 kilometres from home in the BN3 having just
> crossed some many kilometres of featureless plains and semi dessert. We
> arrive in a large town looking for fuel and then suddenly an audible
> clanging sound emanates from the engine. We immediately pull over to
> investigate and despite much head scratching nothing significant can be
> found. I disconnect the fan belt and also eliminate a rocker hitting the
> rocker cover.
>
>
>
> Six and a half hours of sitting in the back seats of a tilt tray truck we
> arrive back home.
>
>
>
> Today I removed the rocker cover and all valves are opening correctly,
plus
> the noise is still there. So what do we think the noise is? Oil pressure
is
> still good, so it probably isn't a slipped big end. It is definitely not
> coming from the gearbox.
>
>
>
> Without taking the engine out, my guess is a broken crankshaft. What's
> yours?
>
>
>
> Hoo Roo
>
>
>
> Patrick Quinn
>
> Sydney, Australia
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