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cjaviator(at)gmail.com
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 Posted: Sun May 12, 2013 2:15 am Post subject: Auto Conversion |
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Hi all.... would also like to chime in on how good the auto conversion is... you may remember the following e-mail I sent through aHad a CJ through for an annual recently and we noticed a couple of irregularities which we have not been able to rectify as yet...
1) #1 mag exhibits a constant mag drop throughout all RPM ranges of about 100 RPM and nearly stops at idle.
Initially we focussed on the mag drop as although not alot, something was not quite right. We changed the plugs for new items (no effect); retimed the mag (no effect); changed the coil (no effect); and somewhat grasping at straws, changed the mags from side to side.
This seemed to fix the fault and the owner took the aircraft away but the fault seems to have returned. Any ideas out there? We are thinking it must be a plug lead. I know many of you have experienced plug lead woes in the past but in 15 years of operating CJ's in a dry environment I have never had a problem before. (aircraft has standard factory harness and leads but is operated in a wetter environment than I am used to).
2) Aircraft can be hard to start. Intitally we thought this was related to the mag problem but it seems to be more fuel related. Initally after the annual I could not get it started and thought it was the part-worn set of plugs we had just installed. I swapped them out for the old plugs with no effect and then realised the aircraft had been parked on a slope for some hours with minimal fuel in it... turned the aircraft 180 degrees and sure enough she started first go.... a-ha - must have been no fuel to carb I thought....
Alas no.... still exhibits hard starting from time to time.... will turn and turn with no sign of life and then exhibit quite a violent ignition event on one or two cylinders. Sometimes it seems it is over-primed (lots of fuel out of the manifold drain) but other times under-primed. Other times it will start happily and repeatedly. Engine being cold or at operating temp does not seem to matter.
As seen above mag timing has been checked. Additionally we have checked shower of sparks (OK) and primer line (OK) but are a bit lost as to where to go now. Next step might be to pull the primer atomiser from the blower case and check it is not blocked/damaged.
Perhaps the two symptoms are related - perhaps not?
Any ideas/help on this gratefully accepted!
Dennis' kit certainly fixed the problem. Thanks to everyone else who contribute ideas, but we had checked most of them and the leads were the last thing to do. The cost of the kit was certainly a whole lot easier than trying to rework the Chinese one. Once we got the old one out I was surprised at the poor condition of the braided conduits. These were badly worn through where the they were clamped to the induction pipes with the original Chinese hardware and installation. I should point out that this is the first time I have encountered this in 17 years and after working on around 6 different CJ's.
Only real problem was the blasted postal system took over 3 weeks to get it to us here in NZ!
BTW... primer atomiser was all good and on the first start with the new leads it was still hard to start... was gutted initially but found that it just needed more prime.... primer must not be putting out the volume of fuel...
Cheers to all,
Jay
[quote][b]
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dsavarese0812(at)bellsout
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| Posted: Mon May 13, 2013 4:20 am Post subject: Auto Conversion |
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Thank you very much Jay.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/12/2013 5:13 AM, Jay McIntyre wrote:
| Quote: | Hi all.... would also like to chime in on how good the auto conversion
is... you may remember the following e-mail I sent through a
/Had a CJ through for an annual recently and we noticed a couple of
irregularities which we have not been able to rectify as yet... /
//
/1) #1 mag exhibits a constant mag drop throughout all RPM ranges of
about 100 RPM and nearly stops at idle./
/Initially we focussed on the mag drop as although not alot, something
was not quite right. We changed the plugs for new items (no effect);
retimed the mag (no effect); changed the coil (no effect); and
somewhat grasping at straws, changed the mags from side to side./
/This seemed to fix the fault and the owner took the aircraft away but
the fault seems to have returned. Any ideas out there? We are thinking
it must be a plug lead. I know many of you have experienced plug lead
woes in the past but in 15 years of operating CJ's in a dry
environment I have never had a problem before. (aircraft has standard
factory harness and leads but is operated in a wetter environment than
I am used to)./
//
/2) Aircraft can be hard to start. Intitally we thought this was
related to the mag problem but it seems to be more fuel related.
Initally after the annual I could not get it started and thought it
was the part-worn set of plugs we had just installed. I swapped them
out for the old plugs with no effect and then realised the aircraft
had been parked on a slope for some hours with minimal fuel in it...
turned the aircraft 180 degrees and sure enough she started first
go.... a-ha - must have been no fuel to carb I thought..../
/Alas no.... still exhibits hard starting from time to time.... will
turn and turn with no sign of life and then exhibit quite a violent
ignition event on one or two cylinders. Sometimes it seems it is
over-primed (lots of fuel out of the manifold drain) but other times
under-primed. Other times it will start happily and repeatedly. Engine
being cold or at operating temp does not seem to matter./
/As seen above mag timing has been checked. Additionally we have
checked shower of sparks (OK) and primer line (OK) but are a bit lost
as to where to go now. Next step might be to pull the primer atomiser
from the blower case and check it is not blocked/damaged./
//
/Perhaps the two symptoms are related - perhaps not?
Any ideas/help on this gratefully accepted!/
Dennis' kit certainly fixed the problem. Thanks to everyone else who
contribute ideas, but we had checked most of them and the leads were
the last thing to do. The cost of the kit was certainly a whole lot
easier than trying to rework the Chinese one. Once we got the old one
out I was surprised at the poor condition of the braided conduits.
These were badly worn through where the they were clamped to the
induction pipes with the original Chinese hardware and installation. I
should point out that this is the first time I have encountered this
in 17 years and after working on around 6 different CJ's.
Only real problem was the blasted postal system took over 3 weeks to
get it to us here in NZ!
BTW... primer atomiser was all good and on the first start with the
new leads it was still hard to start... was gutted initially but found
that it just needed more prime.... primer must not be putting out the
volume of fuel...
Cheers to all,
Jay
*
*
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http://www.matronics.com/Navigator?Yak-List |
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