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Scratched pistons, can i still use it?

 
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snakoil  



Joined: 09 Feb 2010
Posts: 327
Location: Canada

PostPosted: Mon Mar 12, 2018 11:40 am    Post subject: Scratched pistons, can i still use it? Reply with quote

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?

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1979 924 NA


Last edited by snakoil on Mon Mar 12, 2018 11:46 am; edited 3 times in total
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Kenodog  



Joined: 25 Jun 2003
Posts: 2416
Location: Vancouver,B.C.

PostPosted: Mon Mar 12, 2018 11:43 am    Post subject: Reply with quote

Dented or scratched ? Top of the piston or the skirt ?





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1979 Euro 931, Olive
1981 931, Sabine
2014 Mazda CX-5 (Kid's limo)
2008 GS500
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snakoil  



Joined: 09 Feb 2010
Posts: 327
Location: Canada

PostPosted: Mon Mar 12, 2018 11:46 am    Post subject: Reply with quote

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.
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Eric P  



Joined: 21 Jun 2017
Posts: 164
Location: NY, USA

PostPosted: Tue Mar 13, 2018 3:07 am    Post subject: Reply with quote

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
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1980 924 NA, US model
1987 924S, US model
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ideola  



Joined: 01 Oct 2004
Posts: 15489
Location: Woodstock IL

PostPosted: Wed Mar 14, 2018 3:54 am    Post subject: Reply with quote

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.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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