Update on my GMC

[emerystora]

I had posted that I had to be towed 172 miles home.

I have pulled the plugs and found the center of number 6 spark plug broken out.

I pulled the a/c compressor and valve cover and found the rocker on the #6 exhaust valve wasn't moving. The push rod was bent and out of the lifter. I pulled the intake push rod and put it down over the exhaust lifter and the rod moved up and down when cranking.
So, something in that cylinder hit the valve and spark plug.
I tested the compression and it was zero.
So, I either have a broken valve or hole in the piston or both.

I have 81,000 miles on this engine since it was installed in 2004 so I am going to pull it and have it rebuilt.

It will be at the Shawnee GMCMI convention next March.

Emery Stora
77 Kingsley
Frederick, CO

 

[sgltrac]

bummer Emery.

Sully
77 eleganza 2
seattle

> I had posted that I had to be towed 172 miles home.
>
> I have pulled the plugs and found the center of number 6 spark plug broken
> out.
>
> I pulled the a/c compressor and valve cover and found the rocker on the #6
> exhaust valve wasn't moving. The push rod was bent and out of the lifter. I
> pulled the intake push rod and put it down over the exhaust lifter and the
> rod moved up and down when cranking.
> So, something in that cylinder hit the valve and spark plug.
> I tested the compression and it was zero.
> So, I either have a broken valve or hole in the piston or both.
>
> I have 81,000 miles on this engine since it was installed in 2004 so I am
> going to pull it and have it rebuilt.
>
> It will be at the Shawnee GMCMI convention next March.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[john r. lebetski]

On the bright side there were only 3 digits in the tow miles and not 4. I wonder if a stuck valve started the event. Glad you are home with it where
you can eval.
--
John Lebetski
Woodstock, IL
77 Eleganza II
Source America First

 

[jeanette]

Sorry Emery. Hope the rebuild is fast n successful.

Sent from my iPhone

>
> bummer Emery.
>
> Sully
> 77 eleganza 2
> seattle
>

>>
>> I had posted that I had to be towed 172 miles home.
>>
>> I have pulled the plugs and found the center of number 6 spark plug broken
>> out.
>>
>> I pulled the a/c compressor and valve cover and found the rocker on the #6
>> exhaust valve wasn't moving. The push rod was bent and out of the lifter. I
>> pulled the intake push rod and put it down over the exhaust lifter and the
>> rod moved up and down when cranking.
>> So, something in that cylinder hit the valve and spark plug.
>> I tested the compression and it was zero.
>> So, I either have a broken valve or hole in the piston or both.
>>
>> I have 81,000 miles on this engine since it was installed in 2004 so I am
>> going to pull it and have it rebuilt.
>>
>> It will be at the Shawnee GMCMI convention next March.
>>
>> Emery Stora
>> 77 Kingsley
>> Frederick, CO
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[kerry pinkerton]

Wow. That is surrounded by a large low pressure area for sure.
--
Kerry Pinkerton - North Alabama

77 Eleganza II, 403CI, Manny Brakes, 1 ton, tranny, lots of aluminum goodies.

http://www.bdub.net/pinkerton/

'03 Fleetwood Discovery 39L

 

[jdlisenby]

Sorry about your engine. I look forward to seeing the rebuild pics
--
JD Lisenby- USAF Ret
1978 Royale-455
Electromotive Tec2 FI & ignition

Navarre, FL

 

[LarryW]

I would be interested in post mortum conclusions. Very unusual to have a broken valve. Before you remove the engine, why not try pulling that head.
Maybe all it needs is a head reconditioning. Would save a lot of time and effort. Just what I think.
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

 

[Jim Hupy]

I would wager that you will find an exhaust valve head separated from the
stem. (2 piece valve) If that is the case, you will need a different head,
and piston, and perhaps an engine block. Bad stuff for sure.
Jim Hupy
Salem, Or. (Scurring for home before the windstorm hits on saturday)

> I would be interested in post mortum conclusions. Very unusual to have a
> broken valve. Before you remove the engine, why not try pulling that head.
> Maybe all it needs is a head reconditioning. Would save a lot of time and
> effort. Just what I think.
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[kingsley coach]

Emery
Certainly sorry to hear about that engine ! Now I'm starting to wonder
about mine as I contemplate another run to NM for the winter.

Maybe you'll get away easy...here's hoping !!

Mike in NS

> I would wager that you will find an exhaust valve head separated from the
> stem. (2 piece valve) If that is the case, you will need a different head,
> and piston, and perhaps an engine block. Bad stuff for sure.
> Jim Hupy
> Salem, Or. (Scurring for home before the windstorm hits on saturday)

>
> > I would be interested in post mortum conclusions. Very unusual to have a
> > broken valve. Before you remove the engine, why not try pulling that
> head.
> > Maybe all it needs is a head reconditioning. Would save a lot of time
> and
> > effort. Just what I think.
> > --
> > Larry
> > 78 Royale w/500 Caddy
> > Menomonie, WI.
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>

--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS

Life is too short to hold a grudge; slash some tires and call it even !