1976 Overhaul, 1100 Hours..Pass???/

In article .com,
"nrp" wrote:

"Even if there is zero corrosion, engines have a lot of soft parts,
rubber and cork gaskets and the like that go bad with age alone."

Then why doesn't mine leak? or use oil? or show some iron in the oil
analysis (we'll have an update on that in a couple of months though).

I agree there are a lot of raunchy abused and marginally overhauled
engines out there, but with proper care some engines can last well
beyond TBO.

Even aircraft engines don't use cork anymore.


Both Lycoming and Continental insist on supplying cork gaskets for the
rocker covers, even though the far superior silicone type are avaiable.

Mike Spera wrote:

I agree that pulling one jug gives you a limited view. What are you
looking for? Well, how about a lobe that is ground off 30-50%? for
starters.

Just pull the valve covers, crank the engine around by hand, and watch the
operation of the rockers.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.

nrp wrote:

Even aircraft engines don't use cork anymore.

They sure did when this one was last assembled.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.

I'd be concerned about it not flying much. Lots of potential for corrosion
and rust on the cam and insides. Might want to pull a jug and use a
bore scope to look at the insides.


wrote in message
oups.com...
Hey Guys,

I'm looking at at 172 that has 1100 hours since overhaul, holding 73/90
++ on all cylinders...the only thing holding me back, last overhaul was
1976...

I've talked to several seasoned pilots / aircraft owners that say as
long as it's holding good compressions, don't sweat it....

Any opinions?

Thanks,

Jamie A. Landers
PP-ASEL
Looking for a 172

.....Both Lycoming and Continental insist on supplying cork gaskets for
the
rocker covers, even though the far superior silicone type are
avaiable....

The OEM rocker box gaskets are really bad & I agree won't last anywhere
near 25 much less 12 years. I wonder what happens to those aftermarket
red silicon Real Gaskets that come back to Lycoming with cores? When
my OH time comes I'm gonna try to remember to hang onto my old ones.

Which brings to mind that any older overhauled Lycoming engines should
have all the rocker boxes removed on occasion anyway to check if the
free floating rocker arm shafts are wearing their way thru the cover.
Newer engines have a nylon insert to prevent that. I don't think it is
an AD but I recall a service letter or SDR on it. It is on my engine
watch list