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Old 04-06-2010, 06:10 PM   #1
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Cylinder/Valve nightmare

i just bought a 2002 Focus svt and when we went to replace the spark plugs, a piece of the porcelain insulation broke off and fell down into the hole we pulled the plug out of. we were able to pull out a few pieces.after a few misfiring starts I took it to a friends tire-auto shop and the mechanic told me i had only half compression in the cylinder the porcelain fell into and that piece of that porcelain is probably down inside the the cylinder head and is has probably messed up a valve. The mechanic told me that it would cost me $800-$900 to just open it up and take a look. and i would be better off just spending $3000 on a new engine. my dad and a few of my car savy friends say we can take the head off and check it out ourselves. i have no where near that much money to spend right now on a new engine. I'm worried that the porcelain could be scowering the inside of the cylinder possibly. would a new head be a good investment and if so where can i find one for an svt?


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Old 04-06-2010, 06:39 PM   #2
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i would be pulling the head to take a look, chances are there isn't much damage..a valve job (checking the valve and seat sealing area) shouldn't cost any more than $200. the valve/seat is harder than the porcelain and its an cast iron block. if the plug tip is still in there its either burried in the top of the piston or in the combustion chamber of the cyl head. do you have the compression test results...svts have low static compression due to the vct.
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Old 04-07-2010, 06:07 PM   #3
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ya according to the mechanic I was pulling either 120 or 140lbs in cylinders #2,3,4 (where he said they should be) and was only getting 60 in cylinder #1, which is causing it to misfire and run like an absolute ass
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Old 04-07-2010, 06:34 PM   #4
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so if it is burried in the top of the piston or in the combustion chamber of the cylinder head, whats that mean for the engine?
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Old 04-07-2010, 06:54 PM   #5
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so if it is burried in the top of the piston or in the combustion chamber of the cylinder head, whats that mean for the engine?
Neither of these will cause low compression , more then likely some got under a valve and now the valve is damaged , take the head off , may need to change a valve / valve job and replace the head

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Old 04-07-2010, 07:03 PM   #6
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Neither of these will cause low compression , more then likely some got under a valve and now the valve is damaged , take the head off , may need to change a valve / valve job and replace the head

Tom
i think toms spot on ..when my pistons let go a huge chunk from piston 3 went out the exhaust valve marking the seat a bit. just needed to grind the seat a bit and clean up the valve face a bit, the valve stem tip was then ground the same to ensure proper valve clearance.
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Old 04-08-2010, 06:56 PM   #7
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do you guys possibly think it caused the piston ring to fail or is it probably a valve/head problem?
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Old 04-08-2010, 07:34 PM   #8
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A piece of porcelain is not gonna make a piston ring fail.

I have a friend who had a tip of a spark plug break off and punch a hole through his exhaust valve.

Same thing could have easily happened to you. He had 65psi compression in that cylinder. This was on a Mini Cooper S, but it's the same principal.
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Old 04-09-2010, 03:18 PM   #9
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so say it is the valve, what is everything i need to do a "valve job"?
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Old 04-09-2010, 03:27 PM   #10
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take the head off and have a machine shop install new valves on that cylnder and check the seat area
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