Today's Message Index:
----------------------
1. 05:47 AM - Re: Compression (George Coy)
2. 07:34 AM - 95039 (Bill VonDane)
3. 08:57 AM - Re: 95039 (Kregg Victory)
4. 11:21 AM - CJ TOOL SET & EXHAUST VALVES NEEDED (bmiles)
Message 1
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Thanks. I apologize if I am asking questions that were already answered, I
came into this discussion in the middle of it.
A couple of other questions:
1.Were the compressions taken hot or cold?
2. What was the orifice reading on the compression tester and what were the
actual readings?
3. Were they all leaking by the exhaust valves?
4. Did you try "STAKING" the valves?
5. Did you take the aircraft out run it up to temperatures, fly it around
the field and then re check the compressions?
Bear in mind that compression tests with the piston at top dead center only
give an indication of health of the cylinder valves and rings at a moment in
time. It is a guide. History of compressions is just as important. A single
set of readings can be misleading. IF they were taken with cold cylinders
after a period of inactivity, I would certain ally run I up, fly it and re
check them before sending the engine out for overhaul.
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
Sent: Sunday, September 05, 2010 3:25 PM
Subject: Re: Yak-List: Compression
George,
On a very regular basis with the exception of the winter time when it ran
only once every 2 or 3 weeks.
Hans
Op 05-09-10 15:28, George Coy <george@gesoco.com> schreef:
>
> How often was the engine Run?
>
> George Coy
> CAS Ltd.
> 714 Airport Rd.
> Swanton VT 05488
> 802-868-5633 off
> 802-363-5782 cell
> george.coy@gmail.com
> http://coyafct.com/
> SKYPE george.coy
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
> Sent: Sunday, September 05, 2010 4:16 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Compression
>
>
> Mark,
>
> You know how it goes; I want to have an answer sooner and quicker than
those
> mechanics can work.....
> Yeah...I have a very good mechanic(s) working on it. The valves have been
> checked a year and a halve ago and nothing was found wrong.
> Cilinders 4, 5, 6, 7 and 8 have no compression left. The air seems to get
> out via the exhaust valve, you can hear the hissing.....but the thing that
> bothers me really is: why 5 cilinders at the same time???
> It could or can only(?)be a common thing to all those five cilinders?? If
> that is the case it can not be the individual exhaust valve.
>
> The only reasons I can come up with are:
> 1. Fuel....too lean...but this should have an effect on the cilinder head
> temp which has never been in the red zone at all.
> 2. The air start system...something in the "spider", may be....
>
> I'll keep you all informed on the progress the mechanics are making. They
> promised me to send some pictures as well...
>
> W'll keep you posted.
>
> Hans
>
>
>
>
> Op 05-09-10 02:09, Yak Pilot <yakplt@yahoo.com> schreef:
>
>>
>> The question I would ask is:
>>
>> How many hours has it been since someone adjusted your valves?
>>
>> Everyone seems to be on the same page of music here and is thinking
> valves.
>> But are you actually saying that FIVE CYLINDERS HAVE LITTLE OR NO
> COMPRESSION?
>> Not.. the #5 cylinder, but FIVE INDIVIDUAL CYLINDERS? Wow.
>>
>> One thought is: If someone managed to really screw up the valve lash and
>> tightened the things down too much, your valves might never be allowed to
>> fully close. If that happened, your valves would burn up pretty darn
> quickly.
>>
>> Lots of other things comes to mind. But cut to the chase. Get a
> bore-scope
>> and LOOK inside those cylinders. Look at the cylinder walls for scoring
> and
>> look at the valves for signs of burning and high temps.
>>
>> When you run a compression test, what happens to the air you are putting
> in
>> there? Is it coming out the exhaust, or is it coming out the intake? A
> good
>> mechanic ought to be able to tell you what the heck is going on. Just
> saying:
>> "Five Cylinders have little or no compression" tells me that you might
> want to
>> consider getting someone who knows a little more what they are doing. I
> am
>> not a great engine mech. But even I know a little about the basics, and
> you
>> should not have to go to the YAK list for an answer. Not that I (or
> anyone
>> else) minds, but it is just that a good mechanic should be able to tell
> you.
>>
>> Mark Bitterlich
>>
>>
>> --- On Sat, 9/4/10, Hans Oortman <pa3arw@euronet.nl> wrote:
>>
>>> From: Hans Oortman <pa3arw@euronet.nl>
>>> Subject: Yak-List: Compression
>>> To: yak-list@matronics.com
>>> Date: Saturday, September 4, 2010, 3:43 PM
>>> Hans Oortman <pa3arw@euronet.nl>
>>>
>>> Yakkers,
>>>
>>> The engine
>>> of my Yak52 has recently been removed in order to be
>>> repaired in Lithuania.
>>> Problem: 5 cilinders having no or almost no compression.
>>> Engine has always been maintained properly and compression
>>> checked regularly
>>> up to this moment.
>>> Any thoughts/ideas......???
>>>
>>> Hans Oortman
>>> YAK52 RA3326K
>>> Netherlands
>>>
>>>
>>>
>>> Forum -
>>> FAQ,
>>> - MATRONICS WEB FORUMS -
>>> List Contribution Web Site -
>>> -Matt
>>> Dralle, List Admin.
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
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>
Message 2
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Any Yak activity near the 95039 zip code?
Thanks...
-Bill
Message 3
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I am ar 95148
Kregg
Bill VonDane <billvondane@gmail.com> wrote:
>Any Yak activity near the 95039 zip code?
>
>Thanks...
>-Bill
Message 4
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| Subject: | CJ TOOL SET & EXHAUST VALVES NEEDED |
Tired of borrowing Jon's CJ tools, time to buy my own. I need the set if possible.
Also I really need 2 Exhaust valves. Jim Bernier helped me out last time
and I think I need another one.
Thanks guys/gals
Nanchocolate Forever....
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311554#311554
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