GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Fri Feb 17, 2006 1:59 pm Post subject: Lifters and a sucked valve. |
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There may or may not be a correlation, but ...
I had a customer experience a sucked valve and had to land away from home.
I went over and replaced the cylinder. When I removed the lifters to clean
and bleed them for a good dry tappet clearance, I noticed they were really
badly varished and carboned up. They were, in fact, stuck in their bores.
| Quote: | From my early hot rodding days, we would set the clearances on solid lifters
a little tighter to try and get another few thouandths of an inch of lift.
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This old guy at a Phillips 66 station (remember those?) told us we'd burn the
valves because the valve sitting on the valve seat is what transferrred the
heat to the cylinder.
If what we're experiencing with morning sickness (sticking valves) is the
lifter sticking in it's bore, it would be worth investigating the condition of
the lifters and the dry tappet clearance.
On that note: With 120 STOH on my plane, I pulled all of the lifters, bled
them, reinstalled then and checked the dry tappet clearance. They all had
changed some (all were less), some more than others. That's to be expected
with new valves. I reset them all (mixed and matched rockers and push rods)
until I got about 0.050 to 0.065 inch clearance on all tappets. I went on the
high side with the exhaust valves - just in case.
Gary
PS, I contend (and have for 20 years now) that all Lycs need a top overhaul
at 1000 hours. I will now add that doing a dry tappet cleaning and
re-clearancing at 500 hours would be worth the aggravation.
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_________________
Gary
AuCountry Aviation
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