Today's Message Index:
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1. 05:05 AM - Re: Engine won't rotate by hand a full 360 degrees (Archie)
2. 04:42 PM - Re: Engine won't rotate by hand a full 360 degrees (Archie)
3. 08:17 PM - Re: Engine won't rotate by hand a full 360 degrees (Jim Stone)
4. 08:39 PM - Re: Engine won't rotate by hand a full 360 degrees (steve korney)
Message 1
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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>
Depending on position, not necessarily.
It may rule out valve/piston interference, but
not valve/guide clearance, or lack of.
Removing the rockers and rotating will also verify this.
----- Original Message -----
From: "Jim Stone" <jrstone@insightbb.com>
Subject: Re: Engines-List: Engine won't rotate by hand a full 360 degrees
> --> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
>
> During the hang, no piston is near TDC, does that rule out a valve? I
> will
> varify that again tomorrow.
> Thanks,
> Jim
>
> ----- Original Message -----
> From: "Ken Johnson" <glasair@epix.net>
> To: <engines-list@matronics.com>
> Subject: Re: Engines-List: Engine won't rotate by hand a full 360 degrees
>
>
>> --> Engines-List message posted by: "Ken Johnson" <glasair@epix.net>
>>
>> Jim,
>> An easy thing to do would be to check for a valve contacting the top
>> of
>> a piston by removing the spark plugs. This could be caused by either a
>> stuck
>> valve or a lifter stuck in the fully pumped up position.
>> Good luck
>> Ken Johnson
>> ----- Original Message -----
>> From: "Archie" <archie97@earthlink.net>
>> To: <engines-list@matronics.com>
>> Subject: Re: Engines-List: Engine won't rotate by hand a full 360 degrees
>>
>>
>>> --> Engines-List message posted by: "Archie" <archie97@earthlink.net>
>>>
>>> Not likely in the accessory case based on your description and symptoms,
>>> (but possible). The crankshaft gear is one of the smallest in there, and
>> to
>>> rotate
>>> the crank in either direction around 350 deg."almost" dismisses that
>>> probability.
>>>
>>> ----- Original Message -----
>>> From: "Jim Stone" <jrstone@insightbb.com>
>>> To: <engines-list@matronics.com>
>>> Subject: Fw: Engines-List: Engine won't rotate by hand a full 360
>>> degrees
>>>
>>>
>>> > --> Engines-List message posted by: "Jim Stone"
>>> > <jrstone@insightbb.com>
>>> >
>>> > Say it ain't so.
>>> > Jim
>>> > ----- Original Message -----
>>> > From: "steve korney" <s_korney@hotmail.com>
>>> > To: <engines-list@matronics.com>
>>> > Subject: Re: Engines-List: Engine won't rotate by hand a full 360
>> degrees
>>> >
>>> >
>>> >> --> Engines-List message posted by: "steve korney"
>> <s_korney@hotmail.com>
>>> >>
>>> >>
>>> >> Jim...
>>> >>
>>> >> Could be in the assesory case...Maybe even the oil pump...Or the fuel
>>> >> pump
>>> >> push rod...
>>> >>
>>> >> Best... Steve
>>> >>
>>> >>
>>> >> ----Original Message Follows----
>>> >> From: "Jim Stone" <jrstone@insightbb.com>
>>> >> To: <engines-list@matronics.com>
>>> >> Subject: Re: Engines-List: Engine won't rotate by hand a full 360
>> degrees
>>> >> Date: Wed, 21 Dec 2005 09:27:34 -0500
>>> >>
>>> >> --> Engines-List message posted by: "Jim Stone"
>>> >> <jrstone@insightbb.com>
>>> >>
>>> >> Philip,
>>> >> The hang is solid, firm not mushy and has sort of a clunk that can be
>>> >> felt
>>> >> in the accessory section, which is why I removed the mag. I was
>> present
>>> >> for
>>> >> most of the overhaul and I had my mech disassemble the jugs to ensure
>>> >> they
>>> >> were assembled correctly. Perhaps a mistake was made during
>> reassembly.
>>> >>
>>> >> The engine has always been very stiff and I don't recall every making
>>> >> a
>>> >> full
>>> >> 360.
>>> >>
>>> >> The engine was not pickled, but as stated earlier, was oiled well
>> during
>>> >> assymbly and has been at 70 degrees year round with desicator plugs
>>> >> in
>>> >> each
>>> >> of the upper plug holes. Moisture doesn't seem to be an issue. I'm
>> not
>>> >> sure how to check for the the pushrods but will remove the valve
>>> >> covers
>>> >> and
>>> >> start trying to isolate the cause.
>>> >>
>>> >> Thanks for your response,
>>> >> Jim
>>> >>
>>> >> > How is the feel of the "hang"? Solid with a Clonk, solid but not so
>>> >> > Clonky -
>>> >> > rather giving for a few thousandth before to stop, or mushy?
>>> >> >
>>> >> > Was the engine rotated before, when fresh from overhaul?
>>> >> >
>>> >> > There is another type of FO possible: many mechanics use pieces of
>>> >> > split
>>> >> > rubber hose to hold the conrods upright when joining the two
>>> >> > half-cases.
>>> >> > Forget to remove one (unlikely, but can still happen...), and it
>>> >> > can
>>> >> > get
>>> >> > stuck between the crankshaft anf the cylinder's skirt. It may even
>>> >> > allow
>>> >> > the
>>> >> > engine to be rotated a few times before to wedge itself.
>>> >> >
>>> >> > Internal corrosion can also do... pray not! A stuck valve can do
>>> >> > too,
>>> >> > and
>>> >> > this can be a result of corrosion on the stem.
>>> >> >
>>> >> > Was the engine "pickled"?
>>> >> >
>>> >> > The "feel" helps a lot in determining what's wrong, and
>>> >> > unfortunately
>>> >> this
>>> >> > can't be sent through e-mail...
>>> >> >
>>> >> > Rotate slowly, listen attentively, feel through your fingers.
>>> >> > Remove
>>> >> > the
>>> >> > valve covers and check the pushrods. See if the blockage happens
>>> >> > when
>>> >> > one
>>> >> > particular rocker starts pushing on one valve.
>>> >> >
>>> >> > Regards
>>> >> >
>>> >> > Philip
>>> >> >
>>> >> > -----Original Message-----
>>> >> > From: owner-engines-list-server@matronics.com
>>> >> > [mailto:owner-engines-list-server@matronics.com]On Behalf Of Jim
>> Stone
>>> >> > To: engines-list@matronics.com
>>> >> > Subject: Re: Engines-List: 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>
>>> >> > To: <engines-list@matronics.com>
>>> >> > 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
>>> >> >>>
>>> >> >>>
>>> >> >>>
>>> >> >>
>>> >> >>
>>> >> >
>>> >> >
>>> >> >
>>> >>
>>> >>
>>> >>
>>> >
>>> >
>>> >
>>>
>>>
>>
>>
>>
>
>
>
Message 2
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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>
Must have my head up my ---!
Your problem must have been generated after assembly,
inasmuch as after the cylinders are installed, the pushrods must be set to
the proper clearance, therefore the engine must be rotated.
If there was a problem then, it would have manifested itself.
Message 3
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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>
Good, does that give you a better idea of where I should start looking, I
haven't dug into the rocker arm removal so I'm up for anything.
Thanks,
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>
>
> Must have my head up my ---!
> Your problem must have been generated after assembly,
> inasmuch as after the cylinders are installed, the pushrods must be set to
> the proper clearance, therefore the engine must be rotated.
> If there was a problem then, it would have manifested itself.
>
>
>
Message 4
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| Subject: | Re: Engine won't rotate by hand a full 360 degrees |
--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
Jim...
There's no magic bullet here... You might have to start taking it apart...
Best... Steve
----Original Message Follows----
From: "Jim Stone" <jrstone@insightbb.com>
Subject: Re: Engines-List: Engine won't rotate by hand a full 360 degrees
--> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Good, does that give you a better idea of where I should start looking, I
haven't dug into the rocker arm removal so I'm up for anything.
Thanks,
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>
>
> Must have my head up my ---!
> Your problem must have been generated after assembly,
> inasmuch as after the cylinders are installed, the pushrods must be set
to
> the proper clearance, therefore the engine must be rotated.
> If there was a problem then, it would have manifested itself.
>
>
>
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