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Old 08-12-2011, 07:49 PM   #1
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God damn spark plugs

So happy Friday to me my plug blew out on my way back to the shop today and the machine shop doesn't open till Monday . I work at a shop and it's still going to cost 500$ even if I wanted to buy the repair kit and do it myself ( which I don't ) it's gonna cost me 486$ and I might screw it up since I've never done it before . Hope you guy are having a better Friday than me : )
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Old 08-13-2011, 02:41 AM   #2
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Re: God damn spark plugs

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So happy Friday to me my plug blew out on my way back to the shop today and the machine shop doesn't open till Monday . I work at a shop and it's still going to cost 500$ even if I wanted to buy the repair kit and do it myself ( which I don't ) it's gonna cost me 486$ and I might screw it up since I've never done it before . Hope you guy are having a better Friday than me : )
Sorry to hear of your problems.

Can you explain to me why this is so expensive for modular engines?

I'm curious because whenever I have seen it happen to pushrod engines, we just used a spark plug thread tap and some heavy grease or a vacuum to collect the chips, retapped the hole installed a new plug and we're good to go.
All for a cost of less than $20 usually.
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Old 08-13-2011, 05:41 AM   #3
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Re: God damn spark plugs

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Sorry to hear of your problems.

Can you explain to me why this is so expensive for modular engines?

I'm curious because whenever I have seen it happen to pushrod engines, we just used a spark plug thread tap and some heavy grease or a vacuum to collect the chips, retapped the hole installed a new plug and we're good to go.
All for a cost of less than $20 usually.
I'm pretty sure it's because mod engines have aluminum heads, right? Can't just tap it. You have to grind it out then put a sleeve in it, then tap that with new threads. At least, that's what I understand. Someone correct me if I'm wrong.
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Old 08-13-2011, 07:04 AM   #4
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You can rethread the head with a tap and use a sleeve that comes in a kit. You can get the kit from advance auto. I think its calles thread saver. The problem is that the tap is too thick to put in the spark plug well with a socket so you have to weld a bolt on it so it is longer. I have done close to 50 of these at my shop within the last two years and only had one that didnt hold
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Old 08-13-2011, 09:45 AM   #5
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Re: God damn spark plugs

What causes it to happen in the first place?
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Old 08-13-2011, 10:26 AM   #6
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The reason for it costing so much is a couple different factors. first off they use a taper seat style plug rather than the gasket style so you can't just heli coil it or it won't seal so you need to install a whole new seat. The reason for it being so comon is that's it's a very bad design as there is only like 3 threads that actualy contact the plug. It's been an issue since the early 90s when the 4.6 was in the town cars and crown vic's. And now starting in 05 they came out with a new style plug and it has about 9 threads that contact the plug but as we all know if it seems too good to be true it probably is and this is the result.
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Old 08-13-2011, 11:44 AM   #7
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Re: God damn spark plugs

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I'm pretty sure it's because mod engines have aluminum heads, right? Can't just tap it. You have to grind it out then put a sleeve in it, then tap that with new threads. At least, that's what I understand. Someone correct me if I'm wrong.
That's not it. You can tap aluminum just the same as any other metal.

Alll they are doing is the same as we do on aluminum pushrod engine heads.
They are re-tapping the spark plug hole and installing a "heli-coil" or "thread insert" and sometimes a new seat.

The cost is higher because of the specialized (i.e. longer) tools required.
What a rip off.
You mod motor guys need to get together in clubs or whatever and just buy one "kit" that you can share.
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Old 08-13-2011, 01:58 PM   #8
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Here is the tool i made. Works perfect and only had 1 ever come back out of around 50 that ive done
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Old 08-13-2011, 02:57 PM   #9
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Re: God damn spark plugs

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Here is the tool i made. Works perfect and only had 1 ever come back out of around 50 that ive done
Very few people seem have the skills or ingenuity to do things like that any more. Good job!
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Old 08-13-2011, 03:27 PM   #10
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Yay for a 500$ plug repair kit : )
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Old 08-13-2011, 03:29 PM   #11
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Old 08-13-2011, 04:21 PM   #12
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Re: God damn spark plugs

Ridiculous isn't it?
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Old 08-14-2011, 02:54 AM   #13
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Yup but now I can make money off friends and people by doing the Job for 200m$ a plug which is a steal : )
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Old 08-14-2011, 03:14 AM   #14
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Re: God damn spark plugs

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Yup but now I can make money off friends and people by doing the Job for 200m$ a plug which is a steal : )
This is true.
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Old 08-14-2011, 11:25 AM   #15
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Re: God damn spark plugs

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Here is the tool i made. Works perfect and only had 1 ever come back out of around 50 that ive done
All I have to say is patent office If you can market that you could make a fortune
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