2G Bent valves, slapped pistons, need your opinion wisemen.

jimsgsx · May 1, 2017

Had a pulley fail, shredded my timing belt on saturday. I took off the head and all my intake valves were bent. I have never taken a dsm engine completely apart and need to know the damage and any other advice offered. What a crappy weekend! Was just cruisin going 50 when it happened. Thanks in advance.

BoostedBeaver · May 1, 2017

The damage can vary greatly. If the valves contacted the piston, you could be looking at bent valves, cracked guides and possibly some seat damage. As for the bottom end, check the pistons and cylinder walls for obvious damage.

jimsgsx · May 1, 2017

BoostedBeaver said:
The damage can vary greatly. If the valves contacted the piston, you could be looking at bent valves, cracked guides and possibly some seat damage. As for the bottom end, check the pistons and cylinder walls for obvious damage.

Yea i am rebuilding the whole head, i just wanted an opinion on where the valves hit the pistons. Thanks though. How they look? From what you can see anyways.

White flour1gawd · May 1, 2017

Sounds like it's a perfect time to put pistons and rods in

GST with PSI · May 1, 2017

jimsgsx said:
Yea i am rebuilding the whole head, i just wanted an opinion on where the valves hit the pistons. Thanks though. How they look? From what you can see anyways.

I've seen a lot worse. Those should clean up fine. The OEM cast pistons are pretty resilient.

I'd recommend getting the block deck all cleaned, to include removing all the excess carbon from the piston tops like so:

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jimsgsx · May 1, 2017

GST with PSI said:
I've seen a lot worse. Those should clean up fine. The OEM cast pistons are pretty resilient.

I'd recommend getting the block deck all cleaned, to include removing all the excess carbon from the piston tops like so:
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Dang how did you get them so clean? What did you do? And thanks for your input. Much appreciated.

jimsgsx · May 1, 2017

After looking at your pistons, i realize you are correct. Mine are still good thank god. Lifted my spirits up a little. Ive never worked on a dsm engine or took one apart before so i just flat out didn't know if the pistons were bad or ? Thank you sir.

GST with PSI · May 1, 2017

A brush and diesel fuel will work. You need to drop the oil pan to ensure anything that gets past the rings doesn't end up in the pan. This is a "motor out of the car" kind of job.

You want to take care that little to no crap falls down between the piston and piston wall. Put the piston at TDC and take your time.

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jimsgsx · May 1, 2017

GST with PSI said:
A brush and diesel fuel will work. You need to drop the oil pan to ensure anything that gets past the rings doesn't end up in the pan. This is a "motor out of the car" kind of job.

You want to take care that little to no crap falls down between the piston and piston wall. Put the piston at TDC and take your time.

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Thanks.

91talonts1 · May 1, 2017

I would also file down any sharp edges where the valves made contact, and make sure there's no metal raised above the rest of the surface of the piston.

jimsgsx · May 1, 2017

Than

91talonts1 said:
I would also file down any sharp edges where the valves made contact, and make sure there's no metal raised above the rest of the surface of the piston.

Thank you!

pauleyman · May 1, 2017

Intake? You contacted exhaust too.

boostdawd · May 1, 2017

Meh. It's just a little kiss. U should be fine with a head rebuild. Check the guides to as they may have cracked. Definitely clean those pistons. :coy:

jimsgsx · May 2, 2017

pauleyman said:
Intake? You contacted exhaust too.

Yes sir i did. Thank you for your time, much appreciated.

jimsgsx · May 2, 2017

boostdawd said:
Meh. It's just a little kiss. U should be fine with a head rebuild. Check the guides to as they may have cracked. Definitely clean those pistons.

Thanks bud! I just bought a whole new rebuilt head so its time to do some work!

jimsgsx · May 2, 2017

Thanks everyone, this one is now resolved. Have a nice new head already built i picked up. Time to clean those pistons and get to work.

pauleyman · May 2, 2017

T

jimsgsx said:
Thanks bud! I just bought a whole new rebuilt head so its time to do some work!

Thats probably the easiest solution. Did you find out why the pulley failed?

jimsgsx · May 2, 2017

pauleyman said:
T

Thats probably the easiest solution. Did you find out why
Not yet, but i will very soon and let you know. At work now.

jimsgsx · May 2, 2017

Ive only had time to take the head off. This weekend ill get to the bottom of it.

Maes · May 2, 2017

Gum cutter works excellent for cleaning

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2G Bent valves, slapped pistons, need your opinion wisemen.

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