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Piston head has small Gashes

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Old Feb 10, 2009 | 06:05 PM
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Piston head has small Gashes

I had to pull my heads because the heli coil I was trying to install feel into the motor. anyway head pulled and the piston head has two small gashes about a 16th deep each on it,
So how thick is the piston head and will it be ok or should I replace the piston?


Thanks
 
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Old Feb 10, 2009 | 06:37 PM
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Are all the pistons the same? most pistons have "indentations" forged in them from the factory(for valve clearance).......I havent personally pulled the head on my F-150 but in my experience with smaller foreign cars,these indentations are there.
 
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Old Feb 10, 2009 | 07:21 PM
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Thanks for that but these gashes are from the heli coil that fell into the cyclnder.
 
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Old Feb 11, 2009 | 05:08 AM
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Thanks for the clairification....These pistons are pretty beefy,but the call is yours.In the past when working on Mitsubishis,Ive seen plenty of piston damage due to timing belt breakage,and valves hitting the tops of the pistons,but have never had to replace a piston for the gashes...Personally i think you should be fine...but again thats a decision youll have to live with...
 
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Old Feb 11, 2009 | 07:42 AM
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Thanks man!
 
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Old Feb 11, 2009 | 09:57 AM
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Originally Posted by n5926g
Are all the pistons the same? most pistons have "indentations" forged in them from the factory(for valve clearance).......I havent personally pulled the head on my F-150 but in my experience with smaller foreign cars,these indentations are there.
OEM modular pistons have no valve reliefs.
JL
 
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Old Feb 11, 2009 | 10:32 AM
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I wouldnt worry about it as long as there are no gashes or scratches in the cylinder walls from the chips. Hopefully they passed out the exhaust with out issue.

Put it back together and run it.
 
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Old Feb 11, 2009 | 05:30 PM
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Thanks man.. Im gona put it back together and drive it like it is.
 
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Old Feb 12, 2009 | 06:07 PM
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I was told I should file down the sharp eges on the gashes or it will cause hot spots and dentonation.
Is that true?
 
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Old Feb 12, 2009 | 06:15 PM
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I guess it could,but I still have serious doubts that you have any major issue at all.If it would make you feel better,file em down, clean up any "drippins" and button it up.
 
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Old Feb 12, 2009 | 07:17 PM
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I think I will mby file down the two sharp edges just so I can say I did and slap it back together.

Thanks again
 
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Old Feb 12, 2009 | 07:20 PM
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What about using the old head bolts is that a bad idea ?
 
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Old Feb 12, 2009 | 07:24 PM
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Originally Posted by Maxon
What about using the old head bolts is that a bad idea ?
The head bolts MUST be replaced. They're a TTY (torque-to-yield) type,and cannot be reused.
JL
 
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Old Feb 12, 2009 | 07:26 PM
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another 50bucks damn..thanks for the quick reply.
 
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