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Old 12-06-2024, 08:49 PM   #1
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Sparkplug blowout

I have owned an '02 Jayco Firenza with a Ford V10 engine since '04. It now has 66k miles on it and I just experienced my 3rd sparkplug blowout. I read many articles pertaining to this sparkplug problem leaving me more confused than enlighten. The Ford mechanic experts can even seem to agree on a fix.
I'm asking this group if there is someone that can verify that tightening the plugs to 30lbs will stop the remaining plugs from blowing out or following Fords recommendation of 12lbs to avoid stripping the 4 threads that are on the sparkplug..
Please let me know if you've had any experience and sucess with this manufacturing defect.
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Old 12-06-2024, 10:00 PM   #2
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4 threads? That doesn't sound right, shoot, even my 16 HP Honda lawn mower engine has 3/4" reach spark plugs.
I would double check the Ford specification in your owners manual.
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Old 12-06-2024, 10:50 PM   #3
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4 threads? That doesn't sound right, shoot, even my 16 HP Honda lawn mower engine has 3/4" reach spark plugs.
I would double check the Ford specification in your owners manual.
It's true, the first few years of V10s had aluminum heads with 4 threads holding in the plugs.
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Old 12-06-2024, 10:55 PM   #4
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Everything i read said to use 28 ft lbs torque, so i would replace the 7 left that haven't blown out.
Even Ford updated their plug tightness specs to 28. There are repair kits for the heads.

In 2005 Ford increased the amount of threads but used a 2 peice spark plug. They were snapping off, leaving the threaded portion in the head. There is a kit for them too.
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Old 12-07-2024, 09:14 AM   #5
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Thank you so much for for your reply. 28lb ft torque is what I was looking for. I'll have my mechanic check remaining sparkplugs before my next outing.. I had purchased a Time-sert after my first blowout (pretty pricey at close to $500) but only have 1 insert left.

Hopefully, I will not need to purchase more.

I'll let you know if my problem is solved .
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Old 12-07-2024, 05:42 PM   #6
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There is a company in CA. that specialized in the V10 blow out problem. They actually tightened an OEM aluminum 4 thread head to 100 ft. lbs. without striping the threads. Yes Ford's 12 ft. lbs. is the issue.

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Old 12-07-2024, 07:29 PM   #7
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Originally Posted by Fastest View Post
Thank you so much for for your reply. 28lb ft torque is what I was looking for. I'll have my mechanic check remaining sparkplugs before my next outing.. I had purchased a Time-sert after my first blowout (pretty pricey at close to $500) but only have 1 insert left.

Hopefully, I will not need to purchase more.

I'll let you know if my problem is solved .
Additional inserts are not expensive, you can buy them on amazon or ebay for $12-$15 each.
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Old 12-07-2024, 08:13 PM   #8
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Blown out sparkplug

I had experience with the Blownoutsparkplug.com Ford Spark Plug Thread Repair owner in El Cajon years ago. Rick was very knowledgeable and was a 35 year Ford mechanic at El Cajon Ford. He did my 2003 Lazy Daze V-1O and I believe there are only 5 threads and he had done over 300 plugs changes back then but now maybe retired. This was in 2014. His comment to me was Ford improperly torqued the plugs at 15-18 pounds and they would loosen and carbon would build up causing them to blow out. He torqued all his plugs at 30 pounds and never had any call backs. Rick had a brother I recall who also did this repair and he lived in Solvang area. Don’t recall his name. Hope this helps. Travato John
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Old 12-07-2024, 09:21 PM   #9
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When we purchased our 2000 Tioga it had extremely low miles and showed like new .

I chose to do a full maintenance on it before taking it on the road .

The coach was taken to a Ford Truck Service Center where , with all the general maintenance I had them change the sparkplugs with only 14K on the odometer .

The cost for replacing the 10 sparkplugs was $600.00 . I asked about the blowout issue and the Service Manager said their senior mechanic had done well over a hundred rigs without stripping a single plug . However , he did mention that they charged $60.00 per hole to repair if one were to strip the threads removing a plug .

I've been wrenching on motorcycles and hotrods since I was 15 y.o. , but I didn't want to deal with the V10 sparkplugs .

Best $600.00 I've spent in a long time .
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