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Scion tC 1G Forced Induction Turbo and supercharger applications...

Piston Ring Failure :(

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Old Dec 11, 2011 | 10:44 PM
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Default Piston Ring Failure :(

So cylinder 3 came out WAY low.
#1 - 190
#2 - 195
#3 - 125
#4 - 190

Dropped some oil in it and it shot up to 170. If the walls arent scared at all, could i just replace the ring and go. Also do i have to pull the motor all the way to get the head off? Thinking about just for now to loosen the rod bolts through the Oil Pan, pushing piston through the top and replacing the ring just to get the car on the road for now until i get some money im waiting for near New Years to start the build. Is this a solid option?

Last edited by SoFloTC; Dec 11, 2011 at 11:12 PM.
Old Dec 12, 2011 | 12:50 AM
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If there is no scarring, you should be good by doing that if the issue is only ring related, im in your same situation except mines in cyl #4
cyl 1- 180
cyl 2- 180
cyl 3- 180
cyl 4- 160

I dropped oil in mine and it didnt change at all. Put it back to stock see if its still driveable, because mine is and ive been off boost since august. My block's almost here to replace this one though, but if its still driveable i would but it back to stock for now. Keep an eye on your oil and coolant.
Old Dec 12, 2011 | 03:52 AM
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Its prob trashed ring landings, which end up scarring the walls pretty bad. I drove mine for like 6 months once with it like this until I built the motor. It cant really get any worse, unfortunately if youre still turbo itll prob smoke bad due to the excessive crankcase pressure causing the turbo to burn oil. If you go back to NA for awhile until you build it, other than a loss in power, you most likely wont even notice it. As for pulling the head with the motor in the car, I think one person managed to do it, but it was way more trouble than it was worth due to the timing chain cover bolts hitting the frame.
Old Dec 12, 2011 | 04:56 AM
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You always need to deglaze the cylinder walls when installing new pistons/rings. So you will have to pull the motor. Way easier than trying to pull the head in the car anyway
Old Dec 12, 2011 | 05:18 AM
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Originally Posted by sebbyxtc
If there is no scarring, you should be good by doing that if the issue is only ring related, im in your same situation except mines in cyl #4
cyl 1- 180
cyl 2- 180
cyl 3- 180
cyl 4- 160

I dropped oil in mine and it didnt change at all. Put it back to stock see if its still driveable, because mine is and ive been off boost since august. My block's almost here to replace this one though, but if its still driveable i would but it back to stock for now. Keep an eye on your oil and coolant.
If it didnt change at all its headgasket.
Old Dec 12, 2011 | 05:18 AM
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what if we just lift the motor out some?
Old Dec 15, 2011 | 07:14 PM
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Why dont you just pull it? So much easier thant to work on it in a 6 inch cubicle.
Old Dec 15, 2011 | 07:59 PM
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Ya im going to pull it, contemplating just dropping in another motor, do a build or fix the issue.
Old Dec 16, 2011 | 12:18 AM
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I had 5 small cracks on the piston ring in the # cylinder. I pulled the motor, slapped in a stock one, sold the car, and been trying to sell my turbo parts ever since.
Old Dec 16, 2011 | 01:40 AM
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what parts you got PM me
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