Today's Message Index:
----------------------
1. 12:20 AM - Re: Engine won't rotate by hand a full 360 degrees ()
2. 05:20 AM - Re: Oil cooler hose routing (Gary Casey)
3. 07:46 PM - Re: Engine won't rotate by hand a full 360 degrees (Archie)
4. 08:08 PM - Re: Engine won't rotate by hand a full 360 degrees (Jim Stone)
Message 1
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| Subject: | Engine won't rotate by hand a full 360 degrees |
--> Engines-List message posted by: <philipac@suncraftgroup.com>
Jim, If the FO is long (like for example a set of feeler gauges...), the piston
will hang long before TDC. Pull the top plugs and check.
Philip
________________________________
From: owner-engines-list-server@matronics.com on behalf of Jim Stone
Subject: Engines-List: Engine won't rotate by hand a full 360 degrees
--> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
I have a 0 time overhauled Lyc 540 and while attempting to set the mag. I was
rotating the engine with the starter ring or flywheel (prop not installed) and
noticed the engine would stop at one point while rotating clockwise (60degrees
btdc) and at a slightly different place when rotating counterclockwise(40 degrees
btdc).
At both hang points, no piston was approaching TDC (indicating no FOD in cylinder).
I removed the mag but no improvement.
Anyone have any ideas on what might cause this and what I need to do to correct
it?
Thanks,
Jim
Message 2
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| Subject: | Re: Oil cooler hose routing |
--> Engines-List message posted by: Gary Casey <glcasey@adelphia.net>
I'm assuming it is easier to route the hoses into the bottom or you
wouldn't be asking the question. Just remember that the oil will be
at 60psi or more, which is about 5 atmospheres(75psia). The air in
the cooler will be compressed to 1/5 its original volume at that
pressure, leaving most of the cooler with solid oil. Then during
running the remaining air will very likely be quickly absorbed in the
oil and get swept away. Once it is solid oil the air has no way to
get back in. Certainly running the hoses in the top is better, but I
wouldn't get too absorbed in routing the hoses to the top if it were
very difficult.
Gary Casey
> I am making the hoses to route to my oil cooler which is mounted
> vertically. I have an O-320 Lycoming and am wondering if there is a
> preferred way to run the oil to the cooler. Do I need to feed the
> cooler
> from the bottom or the top or does it not make any difference?
>
> Thanks:
>
> Gary
Message 3
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| Subject: | Re: Engine won't rotate by hand a full 360 degrees |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
Excessive choke and tight ring gaps will do it.
If you are using standard aircraft rings, should not be a problem, though
you can normally drive a truck through the gaps.
Are the cylinders oversize? Were they bored correctly?
Archie
Archie's Racing Service
----- Original Message -----
From: "Jim Stone" <jrstone@insightbb.com>
Subject: Engines-List: Engine won't rotate by hand a full 360 degrees
> --> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
>
> I have a 0 time overhauled Lyc 540 and while attempting to set the mag.
> I was rotating the engine with the starter ring or flywheel (prop not
> installed) and noticed the engine would stop at one point while rotating
> clockwise (60degrees btdc) and at a slightly different place when rotating
> counterclockwise(40 degrees btdc).
> At both hang points, no piston was approaching TDC (indicating no FOD in
> cylinder). I removed the mag but no improvement.
> Anyone have any ideas on what might cause this and what I need to do to
> correct it?
> Thanks,
> Jim
>
>
>
Message 4
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| Subject: | Re: Engine won't rotate by hand a full 360 degrees |
--> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Thanks Archie, I was hoping you would give me you opinion.
Not sure about the rings. Probably Lycoming but not sure.
The cylinders are new. I ordered new jugs from Lycoming and had Performance
Aero flow balance and install 10 to 1 forged pistons. The engine was
overhauled 3 years ago and has been at constant temp and humidity since (in
my basement workshop).
Hope this additional info helps,
Jim
----- Original Message -----
From: "Archie" <archie97@earthlink.net>
Subject: Re: Engines-List: Engine won't rotate by hand a full 360 degrees
> --> Engines-List message posted by: "Archie" <archie97@earthlink.net>
>
> Excessive choke and tight ring gaps will do it.
> If you are using standard aircraft rings, should not be a problem, though
> you can normally drive a truck through the gaps.
> Are the cylinders oversize? Were they bored correctly?
> Archie
> Archie's Racing Service
> ----- Original Message -----
> From: "Jim Stone" <jrstone@insightbb.com>
> To: <engines-list@matronics.com>
> Subject: Engines-List: Engine won't rotate by hand a full 360 degrees
>
>
>> --> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
>>
>> I have a 0 time overhauled Lyc 540 and while attempting to set the mag.
>> I was rotating the engine with the starter ring or flywheel (prop not
>> installed) and noticed the engine would stop at one point while rotating
>> clockwise (60degrees btdc) and at a slightly different place when
>> rotating
>> counterclockwise(40 degrees btdc).
>> At both hang points, no piston was approaching TDC (indicating no FOD in
>> cylinder). I removed the mag but no improvement.
>> Anyone have any ideas on what might cause this and what I need to do to
>> correct it?
>> Thanks,
>> Jim
>>
>>
>>
>
>
>
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