Today's Message Index:
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1. 05:13 AM - Exhaust valve lapping (Philip Nicholson)
2. 09:55 AM - Re: Exhaust valve lapping (Walter Lannon)
3. 08:31 PM - Re: Exhaust valve lapping (James Goolsby)
4. 11:04 PM - Top beacon for Yak18T Replacement? (Vesa Saario)
Message 1
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| Subject: | Exhaust valve lapping |
Good day,
My number four cylinder compression has dropped considerably since the last
annual to 50/80. All other cylinders are over 70. We have determined the
exhaust valve is leaking. We have staked the valve but with little
success. My AME (new to the housai) is ready to lap it but doesn=99t
know
the correct grinding details (dimensions/angles) for the valve seats and
the intake and exhaust valves. If anyone has this information or helpful
hints on the process, please advise.
Thanks,
Phil Nicholson
C-FEPN =93 Ottawa
Message 2
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| Subject: | Re: Exhaust valve lapping |
Phil;
Have you checked the valve clearances? These should be checked and
adjusted as required every 50 hrs or so.
These engines seem to have a tendency for the exhaust valve to lose
clearance over time. If not corrected the valve will not fully close.
If you decide to remove the cylinder be aware #4 is the master rod
cylinder and special precautions apply.
Walt
From: Philip Nicholson
Sent: Friday, May 06, 2016 5:12 AM
Subject: Yak-List: Exhaust valve lapping
Good day,
My number four cylinder compression has dropped considerably since the
last annual to 50/80. All other cylinders are over 70. We have
determined the exhaust valve is leaking. We have staked the valve but
with little success. My AME (new to the housai) is ready to lap it but
doesn=99t know the correct grinding details (dimensions/angles)
for the valve seats and the intake and exhaust valves. If anyone has
this information or helpful hints on the process, please advise.
Thanks,
Phil Nicholson
C-FEPN =93 Ottawa
Message 3
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| Subject: | Re: Exhaust valve lapping |
If I remember correctly the angle is 45deg. However check with George Coy o
r Jill at M14.
Sent from my iPad from some where on The 3rd rock from the Sun.
> On May 6, 2016, at 05:12, Philip Nicholson <pednicholson@gmail.com> wrote:
>
> Good day,
> My number four cylinder compression has dropped considerably since the las
t annual to 50/80. All other cylinders are over 70. We have determined the
exhaust valve is leaking. We have staked the valve but with little success.
My AME (new to the housai) is ready to lap it but doesn=99t know the
correct grinding details (dimensions/angles) for the valve seats and the in
take and exhaust valves. If anyone has this information or helpful hints on t
he process, please advise.
>
> Thanks,
>
> Phil Nicholson
> C-FEPN =93 Ottawa
Message 4
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| Subject: | Top beacon for Yak18T Replacement? |
Has anyone replaced the top beacon on their 18T with a newer type strobe ? If so
any info on the replacement type would be great .
vesasaario@hotmail.com
Melbourne Australia.
Vesa
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