Good Afternoon, Mark. From my years of working on engines, it sounds
like the 3 camshaft gear bolts are loose. They can be tightened by
removing the oil pump, but the holes in the cam gear will be
enlongated. You now have aluminum particles in the crankcase, which
for us airplane folks, is a NO GO. You ( Could ) still use the gear,
but I wouldn't. Get a new one. I get mine from Scat. Lock tight the
new gear bolts. John Shaffer. PS, Text me your Phone #. Last December,
all my phone names and numbers accidentally got deleted. My #
419-559-3991. Thanks.
-----------------------------------------From: "Mark Langford"
To: "KRnet"
Cc:
Sent: Sunday February 25 2024 1:24:09PM
Subject: KRnet> what's this noise????
My last flight in KR2 N891JF was back home from the KR Gathering at
KMVN. When I got back, I dumped the hot oil for an oil change, and the
next day I adjusted the valves. I try to do both every 25 hours. The
valve adjustment frequency seems a bit extreme, but what GPASC
recommends, and with most VW heads I've had, two or three valves
always needed adjustment. I'm a bit picky about valve adjustments,
because if you let an exhaust valve go too long without adjustment, it
will eventually tighten up to the point that it never closes. Once it
reaches that point, it gets very hot very quickly, because it doesn't
have the opportunity to dissipate its heat to the valve seat, and will
stretch and break in short order. Been there, done that, and it's no
fun at all! Having said that, I've been running Revmaster heads since
John Bouyea and others have sworn by them, and guess what.....the
valves really hold their adjustment pretty close. I may find one that
needs a tiny fraction of a turn on the adjuster, but often they are
all still perfectly adjusted! Joe Horvath at Revmaster says it's all
about the metallurgy of the head and valve seat material, and that
works for me. Superior cooling may be another factor.
So, while I was adjusting the valves a few days after I returned from
the Gathering, I noticed a weird and ominous noise coming from the
engine, like something large and steel was broken or loose. Has
anybody else every heard one that sounds like this when simply
rotating the engine? I'm just looking for a data point. I don't recall
the engine ever making this noise previously, and can only believe
that if I'd heard it before, I'd have definitely noticed. Listen to
the short movie at
[1]http://www.n56ml.com/n891jf/vw/wierd_volkswagen_noise.mov [2]
(you may have to cut and post this into your browser)
Sorry about the camera moving around a lot during the prop rotation.
One arm is connected to the other, and when rotating the prop with the
right arm, the left arm moves around too! Note that the distributor
and drive gear are removed, just so I could get a better look at the
brass distributor drive helical gear on the crank, which appeared
secured and in one piece, and because it eliminated those two parts as
a source of the problem. --
Mark Langford
"mailto:m...@n56ml.com";>m...@n56ml.com
"http://www.n56ml.com";> [3] "_blank">http://www.n56ml.com
Huntsville, AL
Links:
------
[1] http://www.n56ml.com/n891jf/vw/wierd_volkswagen_noise.mov
[2] http://www.n56ml.com/n891jf/vw/wierd_volkswagen_noise.mov
[3] http://www.n56ml.com
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