Van's Air Force
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Valve clearance
- Thread starter Joe Jet
- Start date
krhea
Well Known Member
I tried to set mine at midpoint .054 or whichever combination gets you the closest. This was done on fresh overhaul, cam, tappets,hydraulics,rockers all fresh from aircraft specialties, I am running one close to upper limit and may replace now that the weather is a little warmer. Make certain that hydraulic lifters are completely free of oil.
Keith Rhea
RV7 79 hours since overhaul.
Dues paid 2019
Keith Rhea
RV7 79 hours since overhaul.
Dues paid 2019
Aim for lower end if you have a choice as .... over time....wear will occur. Remember anything within the range specified by Lycoming is OK. Pushrods can be expensive.....and I also found there is slight variation within same part numbered pushrods. Make sure you read the latest lycoming service manual regarding pushrod lengths & selection. Certain families of pushrods are not to be mixed with others in the same cylinder.
Ellis
Ellis
cajunwings
Well Known Member
Dry tappet clearance
I think mid range is ideal if you can get it. If not I prefer them a little toward the looser limit rather than tighter. The lifter has a large range that it can inflate. It?s true that wear in some places will increase clearences, but the valve wearing into the seat will reduce it.
Don Broussard
RV9 Rebuild in Progress
57 Pacer
I think mid range is ideal if you can get it. If not I prefer them a little toward the looser limit rather than tighter. The lifter has a large range that it can inflate. It?s true that wear in some places will increase clearences, but the valve wearing into the seat will reduce it.
Don Broussard
RV9 Rebuild in Progress
57 Pacer
Brantel
Well Known Member
While researching this a year ago, most folks with tons of knowledge around this do not recommend setup on the lower end of the range.
Agree. I had a burnt valve and valve seat because one was exactly at the low end of the spec.
