Sorry Ned,
That is not an option. The pistons won't come out from below; they don't
clear the block casting.
You have to remove the head to remove a piston.
As I said previously, your next option, presuming that you don't have a
borescope, is probably to remove the head.
It sounds to me as though you have a piston starting to break up; probably
the top ring is coming up through the top land. Just a guess but based upon
some experience.
Sometimes you can damage like this by carefully positioning the piston and
then peering in through the spark plug hole with a good flashlight.
I certainly would not recommend running the engine for too long, broken ring
bits can really score a bore badly.
Michael Salter
www.precisionsportscar.com
-----Original Message-----
From: owner-healeys@autox.team.net [mailto:owner-healeys@autox.team.net] On
Behalf Of Ned Smith
Sent: Wednesday, April 12, 2006 7:41 PM
To: Austin-Healey List
Subject: Bad Sound 3
The story so far:
What we know for sure
A loud noise is heard from the front of the engine
when under power.
The noise diminishes greatly when the spark plugs
are removed and the engine is spun with the starter.
No. 1 cylinder has a large compression loss compared
to the other cylinders.
I removed the rocker arm assembly and both valves
for #1 appear to be closed and I don't see a broken spring.
Suggestions
I can't think of any malfunction that would cause
all these symptoms.
My next step will be to remove the oil pan and withdraw #1
piston from below.
Ned Smith
BJ8
near Chattanooga, TN
N34.98 W85.5
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