Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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 Posted: Thu Apr 15, 2010 11:52 pm Post subject: No Title |
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A bit of slack is never a bad thing with valve clearances, IMHO.
The temperatures transients mean things expand at different rates so as the engine warms cleances will move all over.
I've always used 12 thou, my main concern after valve seat problems with the early heads was to make sure the vales seated well and not how far they opened.
My way:
With the one valve depressed the other tappet should rattle nicely and the just stop (rattling) with a 12 thou feeler gauge under it.
Seldom did I make any adjustments even with the old soft ally bendy heads.
Chasing a few thou is a waste of time, means you are tweaking aduster unnecessarily and several failures have been from broken adjusters.
CJ
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Robert Rivard
Sent: 15 April 2010 21:51
To: jabiruengine-list(at)matronics.com
Subject: Re: JabiruEngine-List: Re:
Thanks Lynn
Sounds good to me
BOB
--- On Wed, 4/14/10, Lynn Matteson <lynnmatt(at)jps.net> wrote:
| Quote: |
From: Lynn Matteson <lynnmatt(at)jps.net>
Subject: JabiruEngine-List: Re:
To: jabiruengine-list(at)matronics.com
Date: Wednesday, April 14, 2010, 1:45 PM
--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)>
I think what you may be encountering is that when you have the other valve fully depressed, the valve spring forces the camshaft away from its otherwise "neutral" position, causing the adjacent valve clearance to increase. I never thought about this before you mentioned it, but to me it is a possibility. This points out that the cam is floating in about .002" of oil, eh?
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 910.3 hrs (since 3-27-2006)
Countdown to 1000 hrs~89.7 to go(101 days to go)
Sensenich 62"x46" Wood (summer)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
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