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snakoil
Joined: 09 Feb 2010 Posts: 362 Location: Montreal, Canada
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Posted: Mon Mar 12, 2018 10:40 am Post subject: Scratched pistons, can i still use it? |
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While cleaning my euro pistons I noticed today one of then has been dented.
Can I still use this pistons in a rebuilt engine or will this damaged my cylinder walls of the block?
_________________ 1979 924 NA
Last edited by snakoil on Mon Mar 12, 2018 10:46 am; edited 3 times in total |
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Kenodog
Joined: 25 Jun 2003 Posts: 2645 Location: Vancouver,B.C.
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Posted: Mon Mar 12, 2018 10:43 am Post subject: |
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Dented or scratched ? Top of the piston or the skirt ?
Leg _________________ 1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
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snakoil
Joined: 09 Feb 2010 Posts: 362 Location: Montreal, Canada
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Posted: Mon Mar 12, 2018 10:46 am Post subject: |
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Sorry for the delay on the picture, as you can see the dent is on top portion of the skirt and scratch is on the side of the skirt. _________________ 1979 924 NA |
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Eric P
Joined: 21 Jun 2017 Posts: 175 Location: NY, USA
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Posted: Tue Mar 13, 2018 2:07 am Post subject: |
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That piston MIGHT be usable if it's cleaned up first. BUT, if something goes wrong, there goes your block and you could need more than just a piston. Those high spots could cause hot spots and pistons can warp when they seize (which it did soft seize). So even if you make it visually perfect, it still might not be perfect.
If you want to use it, ask yourself these questions: How much time will it take to tear down the engine again? How much is a new block worth if it doesn't work? How much is a rebuild kit and new piston? How reliable do you need it to be?
Now assuming you just get a new piston: How much is a new piston that you might be buying eventually anyway?
If it were me, I'd just source another one. I like my cars to be reliable and I don't like rebuilding engines twice if I can help it. In my shop, if it doesn't look perfect, it doesn't go in.
Sorry for the bad news,
Eric _________________ 1980 924 NA, US model
1987 924S, US model |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Wed Mar 14, 2018 2:54 am Post subject: |
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I would not use that piston. It appears that something went thru the combustion chamber. Skirt wear isn't awful, but those crescent dimples / defects on the ring lands and skirt are going to cause problems. _________________ erstwhile owner of just about every 924 variant ever made |
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