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1. 08:59 PM - Re: Housai engine question: compression check (Justin Drafts)
2. 09:14 PM - Re: Re: Housai engine question: compression check (Larry Pine)
Message 1
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| Subject: | Re: Housai engine question: compression check |
Good evening all-
A conundrum for you Housai engine experts; I need some advice to go fwd.
Doing the compression check today, I hit a weird wall.
With a partner I was checking cylinders starting with #1 at top, going CW
when viewed from cockpit.
All #'s were good (avg 75/80 psi), until I got the last cylinder, #2. We
got 0 psi on the pressure gauge.
Checking the pressure tester/gauges/fittings/hose, all are fine and
perfectly functional.
So we double checked the previous cylinder, which had just 10 min prior
tested at 74/80 psi.... now it also
showed 0/80 psi. ??
No obvious air leaks from oil breather, carburetor, or exhaust stack; no
oil evident at bases of the cylinders;
the exhaust and intake stacks are good condition. I had flown the plane
earlier in the day w/o any negative
indications.
Pulled the valve covers off to find the rocker arms, springs, etc in great
condition, doing their job when we
slowly turned the prop thru by hand.
Stuck valves?
We tried the "rope trick" to slip a nylon cord into the cylinder thru the
open sparkplug hole, then gently run
the piston up to TDC to try to reseat the possibly stuck-open valves. As
yet, no help.
Fishing for advice & thoughts... what are we missing?
I've never seen a 0/80 psi reading... a bad piston ring or bad valve,
should have SOME psi indication 30~60psi.
Thoughts? Pointers?
Thanks---
Justin Drafts
N280NC
Message 2
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| Subject: | Re: Housai engine question: compression check |
Clogged secondary gauge. If you collider off the gauge exist and open the v
alve between the two gauges, do you get 80/80? If not the second gauge is h
osed.
Sent from Yahoo Mail for iPhone
On Wednesday, April 28, 2021, 20:58, Justin Drafts <draftsjust417@gmail.com
> wrote:
Good evening all-
A conundrum for you Housai engine experts; I need some advice to go fwd.Doi
ng the compression check today, I hit a weird wall.
With a partner I was checking cylinders starting=C2-with #1 at top, going
CW when viewed from cockpit.=C2-All #'s were good (avg 75/80 psi), until
I got the last cylinder, #2.=C2- We got 0 psi on the pressure gauge.=C2
-=C2-
Checking the pressure tester/gauges/fittings/hose, all are fine and perfect
ly functional.=C2-
So we double checked the previous cylinder, which had just 10 min prior tes
ted at 74/80 psi.... now it also=C2-showed 0/80 psi. ??No obvious air lea
ks from oil breather, carburetor, or exhaust stack; no oil evident at bases
of the cylinders;=C2-the exhaust and intake stacks are good condition.
=C2-I had flown the plane earlier in the day w/o any negative=C2-indica
tions.
Pulled the valve covers off to find the rocker arms, springs, etc in great
condition,=C2-doing their=C2-job when we=C2-slowly turned the prop th
ru by hand.
Stuck valves?=C2-
We tried the "rope trick" to slip a nylon cord into the cylinder thru the o
pen sparkplug hole, then gently run=C2-the piston up to TDC to try to res
eat the possibly stuck-open valves.=C2- As yet, no help.=C2-
Fishing for advice & thoughts... what are we missing?=C2-I've never seen
a 0/80 psi reading... a bad piston ring or bad valve, should have SOME psi
indication 30~60psi.
Thoughts?=C2- Pointers?Thanks---
Justin DraftsN280NC
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