Today's Message Index:
----------------------
1. 12:25 AM - Re: Engine running rough at high power settings? (JL2A)
2. 01:04 AM - Re: CJ Initial Checkout study guide needed (Harv)
3. 10:01 AM - Re: CJ Initial Checkout study guide needed (Off2wildblue)
4. 02:14 PM - Huosai intake tube leakage (Walter Lannon)
5. 02:14 PM - Re: Re: Engine running rough at high power settings? (Walter Lannon)
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| Subject: | Re: Engine running rough at high power settings? |
I've experienced something sort of similar - very intermittent rough running, difficult
to reproduce.
George Coy actually nailed it for us - induction leak. We'd checked all the intake
tube fittings and they were tight and wouldn't explain why it was intermittent
anyway.
So we went in again and started really looking. There was a crack around the weld
where the 'quick drain' intake manifold kit was. Just inspecting wasn't enough,
grabbing a hold of the Curtis valve and twisting it is what revealed the
crack.
A word of caution that you're probably already aware of but adding detergents to
an engine that is already sludged up (generally if it has been run for many
hours on a non-detergent oil) could be asking for some tears. If it's been run
on an ashless dispersant then can't see a great problem, except that a properly
set up engine shouldn't require magic oils imho!
Also from the little I know about Camguard but have spoken to the inventor of it
- it's design purpose is that of a corrosion inhibitor. Not sure what it does
for a sticking valve. I am not an A&P however.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486497#486497
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| Subject: | Re: CJ Initial Checkout study guide needed |
Use the notes you have for the operating the CJ with regard to drills, emergencies
etc
This is useful for m14p engine with the caveat that without seeing your CJ I would
want to be sure you can monitor the engine in the units mentioned.
https://www.yak-52.com/index.htm
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486498#486498
Message 3
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| Subject: | Re: CJ Initial Checkout study guide needed |
Thanks! I will check it out. I really do appreciate it.
SAM
Harv wrote:
> Use the notes you have for the operating the CJ with regard to drills, emergencies
etc
>
> This is useful for m14p engine with the caveat that without seeing your CJ I
would want to be sure you can monitor the engine in the units mentioned.
>
> https://www.yak-52.com/index.htm
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486509#486509
Message 4
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| Subject: | Huosai intake tube leakage |
See JL2A=99s post re cracking around # 4, 5 & 6 cyl intake drain port
s on the Huosai engine..
If you have modified these intake tubes to accept a quick drain system with
out first reinforcing the tubes you are a candidate for this failure. It i
s a job for a good aircraft alum. welder. Patches have to be formed and fi
tted to the tube and the plug boss prior to welding.
The problem arises since the Chinese weld here does not account for the sha
rp change in cross section between the plug boss and the very thin wall of
the tube.
It is adequate (but questionable!) for the original design only. The addit
ion of a drain fitting, or even a hose leading to a drain fitting, is enoug
h to change the dynamics and introduce fatigue cracking around the boss.
This is not a new problem by any means but since I have done no complete re
storations in recent years I had forgotten about it. I recent years I loo
k after only my
own CJ (modified 20+ years ago) and two others with M14P engines which were
properly reinforced in production. Have to admit old age may have some be
aring
here as well.
Walt
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| Subject: | Re: Engine running rough at high power settings? |
-----Original Message-----
From: JL2A
Sent: Sunday, December 23, 2018 12:25 AM
Subject: Yak-List: Re: Engine running rough at high power settings?
<info@flyingwarbirds.com.au.matronics.com>
I've experienced something sort of similar - very intermittent rough
running, difficult to reproduce.
George Coy actually nailed it for us - induction leak. We'd checked all the
intake tube fittings and they were tight and wouldn't explain why it was
intermittent anyway.
So we went in again and started really looking. There was a crack around the
weld where the 'quick drain' intake manifold kit was. Just inspecting wasn't
enough, grabbing a hold of the Curtis valve and twisting it is what revealed
the crack.
A word of caution that you're probably already aware of but adding
detergents to an engine that is already sludged up (generally if it has been
run for many hours on a non-detergent oil) could be asking for some tears.
If it's been run on an ashless dispersant then can't see a great problem,
except that a properly set up engine shouldn't require magic oils imho!
Also from the little I know about Camguard but have spoken to the inventor
of it - it's design purpose is that of a corrosion inhibitor. Not sure what
it does for a sticking valve. I am not an A&P however.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486497#486497
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