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#4508564 - 09/05/17 10:26 PM Interesting mod motor spark plug failure
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
So I blew out another spark plug, but it didnt fully eject. The combustion pressure blew through the threads on a small section then proceeded to Oxy-gasoline torch the spark plug and cylinder head.




Its cut the head so bad it might actually be non-repairable. I dont know how long it was leaking for since I had my radio cranked. Finally I went WOT around a truck and o boy was it loud.
Im glad I already got the ball rolling on getting another engine in it rather than do the timing chains on this engine, since it might need a cylinder head now.
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2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
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#4508587 - 09/05/17 10:58 PM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
Gasbuggy Offline


Registered: 08/26/09
Posts: 1895
Loc: PA
On the crown vic? Never saw anything like that before on a N/A Ford Mod.
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#4508595 - 09/05/17 11:07 PM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
Panzerman Offline


Registered: 12/16/06
Posts: 4203
Loc: Port Orange, Florida
JB Weld to the rescue!!
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#4508598 - 09/05/17 11:11 PM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
dishdude Online   content


Registered: 11/14/08
Posts: 8764
Loc: Phoenix
I'm surprised the compression gases - even blowing the spark up would be hot enough to melt the plug.
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#4508604 - 09/05/17 11:28 PM Re: Interesting mod motor spark plug failure [Re: Gasbuggy]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Originally Posted By: Gasbuggy
On the crown vic? Never saw anything like that before on a N/A Ford Mod.

Yap
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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#4508661 - 09/06/17 02:33 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
Dave9 Offline


Registered: 08/28/17
Posts: 188
Loc: Cincinnati, USA
This is abnormal, I suspect a combination of not torquing them enough then cleaning your engine perpetually with water and letting the threads rust out.

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#4508679 - 09/06/17 04:04 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
barryh Offline


Registered: 01/09/16
Posts: 312
Loc: Cheshire, England
Combustion gases not hot enough to do that damage ?

I don't fully understand the mechanism at work but it's more erosion than melting. if you have a gasket failure on a steam pipe and leave it to leak long enough without repair it will cut a groove in a sold steel pipe flange that looks a lot like that spark plug damage.
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1979 BMW R45 (Triple QX 5W40)
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#4508700 - 09/06/17 05:54 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
OVERKILL Online   content


Registered: 04/28/08
Posts: 36470
Loc: Ontario, Canada
That's impressive if anything. Do you have a borescope to take a peek at the underside? I agree with you that it may be "unrepairable" as in the head would need to be removed and welded, then worked, then an insert put in.
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#4508722 - 09/06/17 06:43 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
andyd Online   content


Registered: 09/25/04
Posts: 7166
Loc: Marshfield , MA
That is a deep reach plug. How does it "blow out" ? There is nearly an inch of thread on the plug. Could somebody s'plain the mode of failure to me? Once again FOMOCO metallurgy fails to impress. Colt45ws isn't at fault here. TIA
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#4508742 - 09/06/17 07:09 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
Kruse Offline


Registered: 10/05/05
Posts: 4298
Loc: Kansas
I'd bet it was giving indications of a problem for quite awhile, but like you said, if your stereo was cranked, I guess you didn't hear it.
Which cylinder was this one? Like you probably guess, I bet this one will require a new cylinder head.

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#4508788 - 09/06/17 08:28 AM Re: Interesting mod motor spark plug failure [Re: Kruse]
Canadastang Offline


Registered: 12/08/15
Posts: 261
Loc: Ontario Canada
Is this the generation of 2V's that only had something crazy like 4 threads?

I know in later years they added more threads to prevent this from happening.

Fordtechmakuloco advocates overtorquing the plugs to about 20 ft. lbs, instead of the called for 10ish ft lbs. I did that on my Town Car 6 months ago and no issues.

Did you use a torque wrench on the last plug change?

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#4508803 - 09/06/17 08:49 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11970
Loc: N.H, U.S.A.
Al heads, peanut plugs with no gasket. Nice design.

I do like this engine though for many REAL advancements in mfg that would make Grumpy ole Henry happy.

I Specifically find the assembled camshaft(s) with sintered lobes to be real out of box thinking.
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#4508805 - 09/06/17 08:50 AM Re: Interesting mod motor spark plug failure [Re: Colt45ws]
WyrTwister Offline


Registered: 01/13/13
Posts: 1532
Loc: Texas
You plan to replace the entire engine , not just the head ? What , salvage yard engine ?

Best luck to you , :-)
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Wyr
God bless

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#4508808 - 09/06/17 08:56 AM Re: Interesting mod motor spark plug failure [Re: WyrTwister]
Canadastang Offline


Registered: 12/08/15
Posts: 261
Loc: Ontario Canada
Originally Posted By: WyrTwister
You plan to replace the entire engine , not just the head ? What , salvage yard engine ?

Best luck to you , :-)


Swap in a 5.4 2V from a truck or van and if funds allow, throw on some trick flow heads, port the exhaust manifolds and make some real power!

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#4508842 - 09/06/17 09:18 AM Re: Interesting mod motor spark plug failure [Re: OVERKILL]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Originally Posted By: OVERKILL
That's impressive if anything.


I have never seen anything like this in my life.

I mean, I have seen spark plug failures (center blows out of steel shell) and spark plug holes fail in numerous ways, but this is COMPLETELY new.

Yes, time for that engine swap we were talking about!
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