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1. 07:42 PM - Re: Re: Engine Won't rotate (Jim Stone)
2. 08:04 PM - Re: Re: Engine Won't rotate (D Wysong)
Message 1
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| Subject: | Re: Engine Won't rotate |
--> Engines-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Hi Fellas,
I've got good news! After pulling rocker box covers to verify valve action
on each cylinder, I started with my next suspect area which was the
accessory section, in particular the Mag and the Vac pad area, both of which
I have had open post overhaul. No luck on either place. So, as all good
troubleshooters do prior to major tear downs looking for that Gremlin, I sat
down and starred at the engine, rethinking my strategy and attempting to
catch what I must have overlooked. I'm a bit embarrassed to admit, but
this is was my discovery.
I had installed a single and temporary bolt to hold the fly-wheel to the
crankshaft and I was turning the engine using the flywheel teeth with my
gloved hand. The bolt I chose, stuck out the back of the crank flange about
1/2" and as I rotated the engine the bolt end was contacting the Electro air
ignition pickup arm which is mounted under and just aft of the aft face of
the crank flange. Boy was I relieve to find this prior to disassembly of
the jugs.
I sure do appreciate all the help I got from those of you who took time to
respond, and it gave me the motivation to get to the bottom of the problem
ASAP.
Thanks again guys,
Jim Stone
Harmon Rocket II
----- Original Message -----
From: "J. Mcculley" <mcculleyja@starpower.net>
Subject: Engines-List: Re: Engine Won't rotate
> --> Engines-List message posted by: "J. Mcculley"
> <mcculleyja@starpower.net>
>
> Jim,
>
> I may have missed seeing every suggestion on this stuck rotation
> subject, but have you used a borescope to inspect the total interior of
> every cylinder? Something left in a cylinder,or a piston touching the
> head seems improbable since it was pointed out that the engine had to be
> turned through more than a complete revolution to check dry tappet
> clearances during assembly(assuming that wasn't forgotten). Therefore,
> it seems the problem developed AFTER major assembly. However,the
> borescope could help search the accessory case interior for something
> created during the attachment of one of the accessories. Why not remove
> one-by-one the fuel pump,BOTH mags,etc and test it as each is removed.
> Using the borescope into each opening as you proceed could also be
> helpful to see more of the case interior along the way. This would be
> far less invasive than beginning to totally dismantle the cylinders, and
> you mentioned feeling and/or hearing the clunk sound near the accessory
> case as I believe I recall.
>
> Jim McCulley
>> Jim,
>>
>> If it's an exhaust valve that is stuck, the piston will be on its way
>> down,
>> close to BDC.
>>
>> I'd check under the valve covers first, that's easily accessible... Then,
>> after this is ruled out, the accessory case. Then... Do you need a full
>> re-assembly guide, with pictures? :>)
>>
>> Have a nice day
>>
>> Philip
>>
>> -----Original Message-----
>> From: owner-engines-list-server@matronics.com
>> [mailto:owner-engines-list-server@matronics.com]On Behalf Of Jim Stone
>> 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
>
>
>
Message 2
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| Subject: | Re: Engine Won't rotate |
--> Engines-List message posted by: D Wysong <hdwysong@gmail.com>
That's great news, Jim! I bet you believe in Santa Claus again, eh?!
As someone that's preparing to plunk down some money on an engine it's
reassuring to see this forum in action. Thanks for posting the enlightening
thread AND for coming clean when you found out what was wrong. All the best
for the New Year.
D
do not archive
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