Bill,
FWIW, I run mine at .016 per cam manufacture and have never had a
problem w/pushrod jumping out and I have been known to rev it in the
tachometers red zone.
Don
57' BN4
-----Original Message-----
From: healeys-bounces@autox.team.net
[mailto:healeys-bounces@autox.team.net] On Behalf Of WILLIAM B LAWRENCE
Sent: Tuesday, October 14, 2008 5:47 PM
To: healeys@autox.team.net
Subject: [Healeys] FW: Things that make you go Hmm!
----------------------------------------
> From: ynotink@msn.com
> To: healey-bounces@autox.team.net
> Subject: Things that make you go Hmm!
> Date: Tue, 14 Oct 2008 23:25:43 +0000
>
>
> On the way to the parts store in my BN1 yesterday I had a sudden
failure
complete with popping sounds and power loss and hissing noises. I
thought I
had blown another head gasket, but unable to reach my wife to bring a
tow
vehicle I limped home.
>
> I started to disassemble in preparation for repairing the gasket, the
head
and block surfaces if needed etc. but I only got as far as the valve
cover
when I discovered the problem. The pushrod on the #3 exhaust valve had
become
disengaged from the lifter and rocker.
>
> I pulled the rocker shaft and retrieved the pushrod to discover that
it was
perfectly straight and undamaged. When i reassembled the rocker shaft
and
checked valve clearances the setting was correct. (I run a 3/4 race Isky
cam
and the recommended valve clearance is 0.018"). I ran the other valves
and
found no discrepancies. After reassembly she started and ran with no
problem.
I was not revving the engine very high and 4,000 RPM is about as tight
as I
wrap it.
>
> Despite the noise and the terrible miss there was no harm done and the
repair was pretty simple, but I would like to avoid this in the future.
>
> Has anyone had this experience? Are there any ideas as to what would
cause
this to happen? Is 0.018" enough slack to allow the pushrod to jump out
of its
position? I know that some people use bucket lifters that might have
helped
avoid this. What lifters and pushrods do they use?
>
>
> Flummoxed!
>
>
> Bill Lawrence
> Albuquerque, NM
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