AOPA Pilot Magazine - June 2022 - 98

RUDDER & WRENCH
" I think I'd better purchase a decent borescope, "
Whit said. Svelmoe recommended
the Vividia Ablescope VA-400 from Oasis
Scientific for $250.
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Engine hiccupping and popping
Fast forward two and a half years to
September 2014. Engine time was about
3,250 hours. The club organized a spotlanding
contest, and several members
reported the engine was hiccupping and
making loud popping sounds when throttled
back for landing. Whit asked Svelmoe
for advice.
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The only COMPLETE RESOURCE
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" Hiccupping and popping suggests
one cylinder is intermittently not firing,
so unburned air-fuel mixture is
being pumped out the exhaust port and
combusting in the manifold, " Svelmoe
explained. " Not likely an ignition problem;
that would require both plugs not to
fire. More likely a sticking exhaust valve,
so I recommend we have the shop do a
wobble test ASAP. "
All four exhaust valves passed the test
with flying colors, but in the process of
removing the rockers and exhaust valve
springs for the test, the shop discovered
a rocker shaft bushing in cylinder No. 2
was cracked and broken. A new bushing
was installed and the hiccupping and popping
disappeared.
Oil consumption rising
Fast forward to September 2016. Engine
time about 3,700 hours.
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" The engine used eight quarts of oil
since the oil change 35 hours ago, " Whit
reported to Svelmoe, " and I'm starting to
get concerned. "
" That's 4.4 hours per quart, " Svelmoe
said. " While that's a bit higher than
ideal, it's not a problem beyond tolerating
some oil on the belly. " He explained
that in high-time engines, that type of
oil consumption often is because of the
accumulation of sludge in the oil control
rings and piston oil feed holes. A solvent
flush procedure can sometimes clear the
sludge if it isn't too bad. If a piston can't be
cleaned up via the solvent flush, he added,
the only cure is to remove the cylinder.
A couple of months later, Whit
reported oil consumption was 3.3 hours
per quart.
98
AOPA PILOT / June 2022

http://www.AOPA.ORG/PILOTGUIDES

AOPA Pilot Magazine - June 2022

Table of Contents for the Digital Edition of AOPA Pilot Magazine - June 2022

Contents
AOPA Pilot Magazine - June 2022 - Intro
AOPA Pilot Magazine - June 2022 - Cover1
AOPA Pilot Magazine - June 2022 - Cover2
AOPA Pilot Magazine - June 2022 - 1
AOPA Pilot Magazine - June 2022 - Contents
AOPA Pilot Magazine - June 2022 - 3
AOPA Pilot Magazine - June 2022 - 4
AOPA Pilot Magazine - June 2022 - 5
AOPA Pilot Magazine - June 2022 - 6
AOPA Pilot Magazine - June 2022 - 7
AOPA Pilot Magazine - June 2022 - 8
AOPA Pilot Magazine - June 2022 - 9
AOPA Pilot Magazine - June 2022 - 10
AOPA Pilot Magazine - June 2022 - 11
AOPA Pilot Magazine - June 2022 - 12
AOPA Pilot Magazine - June 2022 - 13
AOPA Pilot Magazine - June 2022 - 14
AOPA Pilot Magazine - June 2022 - 15
AOPA Pilot Magazine - June 2022 - 16
AOPA Pilot Magazine - June 2022 - 17
AOPA Pilot Magazine - June 2022 - 18
AOPA Pilot Magazine - June 2022 - 19
AOPA Pilot Magazine - June 2022 - 20
AOPA Pilot Magazine - June 2022 - 21
AOPA Pilot Magazine - June 2022 - 22
AOPA Pilot Magazine - June 2022 - 23
AOPA Pilot Magazine - June 2022 - 24
AOPA Pilot Magazine - June 2022 - 25
AOPA Pilot Magazine - June 2022 - 26
AOPA Pilot Magazine - June 2022 - 27
AOPA Pilot Magazine - June 2022 - 28
AOPA Pilot Magazine - June 2022 - 29
AOPA Pilot Magazine - June 2022 - 30
AOPA Pilot Magazine - June 2022 - 31
AOPA Pilot Magazine - June 2022 - 32
AOPA Pilot Magazine - June 2022 - 33
AOPA Pilot Magazine - June 2022 - 34
AOPA Pilot Magazine - June 2022 - 35
AOPA Pilot Magazine - June 2022 - 36
AOPA Pilot Magazine - June 2022 - 37
AOPA Pilot Magazine - June 2022 - 38
AOPA Pilot Magazine - June 2022 - 39
AOPA Pilot Magazine - June 2022 - 40
AOPA Pilot Magazine - June 2022 - 41
AOPA Pilot Magazine - June 2022 - 42
AOPA Pilot Magazine - June 2022 - 43
AOPA Pilot Magazine - June 2022 - 44
AOPA Pilot Magazine - June 2022 - 45
AOPA Pilot Magazine - June 2022 - 46
AOPA Pilot Magazine - June 2022 - 47
AOPA Pilot Magazine - June 2022 - 48
AOPA Pilot Magazine - June 2022 - R-1
AOPA Pilot Magazine - June 2022 - R-2
AOPA Pilot Magazine - June 2022 - R-3
AOPA Pilot Magazine - June 2022 - R-4
AOPA Pilot Magazine - June 2022 - 49
AOPA Pilot Magazine - June 2022 - 50
AOPA Pilot Magazine - June 2022 - 51
AOPA Pilot Magazine - June 2022 - 52
AOPA Pilot Magazine - June 2022 - 53
AOPA Pilot Magazine - June 2022 - 54
AOPA Pilot Magazine - June 2022 - 55
AOPA Pilot Magazine - June 2022 - 56
AOPA Pilot Magazine - June 2022 - 57
AOPA Pilot Magazine - June 2022 - 58
AOPA Pilot Magazine - June 2022 - 59
AOPA Pilot Magazine - June 2022 - 60
AOPA Pilot Magazine - June 2022 - 61
AOPA Pilot Magazine - June 2022 - 62
AOPA Pilot Magazine - June 2022 - 63
AOPA Pilot Magazine - June 2022 - 64
AOPA Pilot Magazine - June 2022 - 65
AOPA Pilot Magazine - June 2022 - 66
AOPA Pilot Magazine - June 2022 - 67
AOPA Pilot Magazine - June 2022 - 68
AOPA Pilot Magazine - June 2022 - 69
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AOPA Pilot Magazine - June 2022 - 71
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AOPA Pilot Magazine - June 2022 - 79
AOPA Pilot Magazine - June 2022 - 80
AOPA Pilot Magazine - June 2022 - 81
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AOPA Pilot Magazine - June 2022 - 85
AOPA Pilot Magazine - June 2022 - 86
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AOPA Pilot Magazine - June 2022 - 89
AOPA Pilot Magazine - June 2022 - 90
AOPA Pilot Magazine - June 2022 - 91
AOPA Pilot Magazine - June 2022 - 92
AOPA Pilot Magazine - June 2022 - 93
AOPA Pilot Magazine - June 2022 - 94
AOPA Pilot Magazine - June 2022 - 95
AOPA Pilot Magazine - June 2022 - 96
AOPA Pilot Magazine - June 2022 - 97
AOPA Pilot Magazine - June 2022 - 98
AOPA Pilot Magazine - June 2022 - 99
AOPA Pilot Magazine - June 2022 - 100
AOPA Pilot Magazine - June 2022 - 101
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AOPA Pilot Magazine - June 2022 - 108
AOPA Pilot Magazine - June 2022 - 109
AOPA Pilot Magazine - June 2022 - 110
AOPA Pilot Magazine - June 2022 - 111
AOPA Pilot Magazine - June 2022 - 112
AOPA Pilot Magazine - June 2022 - Cover3
AOPA Pilot Magazine - June 2022 - Cover4
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