LQ4 nicked piston, replace or run it

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Mar 31, 2021 | 05:52 PM

Lil'John

Thread Starter

Launching!

Joined: Sep 2009

Posts: 250

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LQ4 nicked piston, replace or run it

Title states it. Here is piston in question:

Long:
Engine is mostly stock 2004 LQ4 with mild cam and valve springs(BTR platinum) swapped in. Engine has super low mileage for its year: ~65k. I had to pull the head when rod #7 snapped due to fuel hydrolock

Only good thing so far is cylinder #7 is in good shape.

I can't see what nicked piston #1 above.

Aside from the cam/valve springs, there is nothing else on the engine. No performance adders. It is used in an offroad setting when I might rev the engine up to ~6k rpm.

Mar 31, 2021 | 06:28 PM

G Atsma

TECH Senior Member

Joined: Jun 2016

Posts: 22,307

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From: Central Cal.

Sand down any raised bits and send it.

Apr 1, 2021 | 01:35 PM

Lil'John

Thread Starter

Launching!

Joined: Sep 2009

Posts: 250

Likes: 3

Quote:

Originally Posted by G Atsma

Sand down any raised bits and send it.

So pull the piston, use some 240 grit, and hit it until level?

Apr 1, 2021 | 01:39 PM

G Atsma

TECH Senior Member

Joined: Jun 2016

Posts: 22,307

Likes: 3,622

From: Central Cal.

Whatever it takes to get rid of any sharp edges or points that could cause preignition.

Apr 2, 2021 | 10:04 AM

stockA4

TECH Fanatic

Joined: May 2016

Posts: 1,292

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From: St. Louis

There's no need to remove that piston as others have said just rub down the rough edges and let it go, any tiny fleck of s*** will get caught in the oil and you're going to change that anyway