| [GMCnet] Update on my GMC [message #308687] |
Thu, 13 October 2016 13:53  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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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
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| Re: [GMCnet] Update on my GMC [message #308689 is a reply to message #308687] |
Thu, 13 October 2016 14:41  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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bummer Emery.
Sully
77 eleganza 2
seattle
On Thu, Oct 13, 2016 at 11:53 AM, Emery Stora wrote:
> 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
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Update on my GMC [message #308692 is a reply to message #308687] |
Thu, 13 October 2016 15:50 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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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
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| Re: [GMCnet] Update on my GMC [message #308701 is a reply to message #308689] |
Thu, 13 October 2016 18:25 |
Jeanette
Messages: 118
Registered: May 2013
Karma: 0
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Sorry Emery. Hope the rebuild is fast n successful.
Sent from my iPhone
> On Oct 13, 2016, at 2:41 PM, Todd Sullivan wrote:
>
> bummer Emery.
>
> Sully
> 77 eleganza 2
> seattle
>
>> On Thu, Oct 13, 2016 at 11:53 AM, Emery Stora wrote:
>>
>> 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
> _______________________________________________
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> Unsubscribe or Change List Options:
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| Re: [GMCnet] Update on my GMC [message #308720 is a reply to message #308718] |
Fri, 14 October 2016 08:59 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Senior Member |
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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
On Fri, Oct 14, 2016 at 10:35 AM, James Hupy wrote:
> 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)
> On Oct 14, 2016 5:57 AM, "Larry" wrote:
>
>> 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.
>>
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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 !
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