Duramax Diesels Forum Truck of the Week
  #16  
Old 11-06-2017, 06:34 AM
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Bump for pics
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04 LB7 ECSB down with a cracked piston, build in progress- Wagler narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, 2 CP3's, S475/Stock twins.
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  #17  
Old 11-06-2017, 12:42 PM
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Quote:
Originally Posted by Josh154 View Post
Why not just throw some lb7 pistons in it? From what Iíve read you werenít high power or dont have crazy high power goals. So if the block is good why canít you just put some lb7 pistons in with your lbz rods? Should be more reliable than another lbz/lmm motor with shit pistons as youíve found out.
I found a set just gotta make sure the guy has them still, Iím not even going to de-lip them, trucks going back to stock tune and down the road, just donít want it blowing up on the next guy in 3 months, if thy turn it back up, then thatís at heir own risk.
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  #18  
Old 11-06-2017, 12:45 PM
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Quote:
Originally Posted by Chevy1925 View Post
Still needs to delip those lb7 pistons if he does them and then it’s dependent on how worn the cyl and pistons are to still keep a decent p to w clearance. Cylinders can look great but that doesn’t mean they do t have a taper, out of round or just have a larger bore than new
Cross hatch is still there and you can feel it, Pistons looks brand new other than they all are started by to crack at the top, some in multiple places, #8 has small cracks on the lip in between the injector marks in three places, and it’s got a 32nd of a wide crack, with that and #2 cracked that’s where my oil in the driver side PCV was coming from.

I’m not doing anything glorious, stock lb7 slugs, new bearings, new head bolts and gaskets and back together it goes.
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Last edited by WVRigrat05; 11-06-2017 at 12:52 PM.
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  #19  
Old 11-06-2017, 12:51 PM
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Quote:
Originally Posted by lutzjk913 View Post
Did it eat all 8 pistons?
#2 had a perfect split, the other 7 all have a small crack on the top of the lip, some have multiple cracks starting. No signs of melting or scoring just cracking.
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  #20  
Old 11-06-2017, 01:02 PM
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Quote:
Originally Posted by Robby Avery View Post
You say 8 pistons what initially happened? Noise? Hg failure? Question was never answered as to why the heads were pulled just curious.
Cracked a piston and wanted to see if the block was good.
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  #21  
Old 11-06-2017, 01:06 PM
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Quote:
Originally Posted by WVRigrat05 View Post
Cross hatch is still there and you can feel it, Pistons looks brand new other than they all are started by to crack at the top, some in multiple places, #8 has small cracks on the lip in between the injector marks in three places, and itís got a 32nd of a wide crack, with that and #2 cracked thatís where my oil in the driver side PCV was coming from.

Iím not doing anything glorious, stock lb7 slugs, new bearings, new head bolts and gaskets and back together it goes.
looking at it wont tell you anything, you would be surprised at the wear from new to used.

Anyhow, thats me being a stickler when putting an engine together. if i were in your shoes, id do the same but id SERIOUSLY delip those pistons. just take them to a machine shop, tell them to take 1/8" off the lip, round it out and give them back to you. shouldnt take them more than a day to do. it will really help with your right foot. add in some new rings too
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  #22  
Old 11-06-2017, 01:47 PM
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Open up to 2.5" on the bowl with a 3/8 radius IIRC
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  #23  
Old 11-06-2017, 03:11 PM
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Joe’s gonna post of pics of the pistons so you can see how they’re cracked.
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  #24  
Old 11-06-2017, 04:46 PM
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Here they are man

<a href="http://s1053.photobucket.com/user/lutzjk9131/media/475D06E0-AAF7-4BDF-A89C-E577A2A6CABB_zpsyfddua2c.jpg.html" target="_blank"><img src="http://i1053.photobucket.com/albums/s469/lutzjk9131/475D06E0-AAF7-4BDF-A89C-E577A2A6CABB_zpsyfddua2c.jpg" border="0" alt=" photo 475D06E0-AAF7-4BDF-A89C-E577A2A6CABB_zpsyfddua2c.jpg"></a>

<a href="http://s1053.photobucket.com/user/lutzjk9131/media/E2FDD531-9AA8-4C17-AE3F-6BF04BA2794E_zps1g9x8izl.jpg.html" target="_blank"><img src="http://i1053.photobucket.com/albums/s469/lutzjk9131/E2FDD531-9AA8-4C17-AE3F-6BF04BA2794E_zps1g9x8izl.jpg" border="0" alt=" photo E2FDD531-9AA8-4C17-AE3F-6BF04BA2794E_zps1g9x8izl.jpg"></a>



<a href="http://s1053.photobucket.com/user/lutzjk9131/media/D5AA4C2E-5456-4081-802C-D7B7BF99AB6A_zpslc9atg7q.jpg.html" target="_blank"><img src="http://i1053.photobucket.com/albums/s469/lutzjk9131/D5AA4C2E-5456-4081-802C-D7B7BF99AB6A_zpslc9atg7q.jpg" border="0" alt=" photo D5AA4C2E-5456-4081-802C-D7B7BF99AB6A_zpslc9atg7q.jpg"></a>
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  #25  
Old 11-06-2017, 05:47 PM
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That's only four I thought all 8 were toast? Is that the only one cracked all the way across or were there more? Rest look like hair line fractures
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2002 Chevy 2500HD LB7 Duramax Summit White CCSB Grey (neutral) leather LT3 pkg OEM bra 4x4, Kennedy Twin Pump Filter Combo Kit, ISSPRO EV, PPE Boost Valve, DTS Built Allison, MikeL Cooler, ATS Billet Flexplate, DTS 3in DS IC pipe, Bill's 5in CAI (White), Big K&N, 4in to 7in black stack, Mickey Thompson Baja Claw TTC 315/75/16 on stock rims, Cognito P&I Brace kit, Sleeves, Energy Sway bar Kit, DD/Puller/Work truck



Special Thanks: (David) DTS, (Guy) Socal Diesel, (Nick & crew) DuramaxTuner, (Dan) PPE, (John) Kennedy Diesel, (Tony) All Season
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  #26  
Old 11-06-2017, 05:57 PM
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Quote:
Originally Posted by Robby Avery View Post
That's only four I thought all 8 were toast? Is that the only one cracked all the way across or were there more? Rest look like hair line fractures
I only took pics of the driver side, passenger side is just hairlines on the top just like the ones in the pic, only one was completely split, just never seen pistons start to crack on the tops like that was the reason for the pics.
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  #27  
Old 11-06-2017, 05:59 PM
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Default Pulling head/s

Thatís not uncommon. This is what happens when the lip gets super heated from high duration, high timing tuning. One of the pistons from my engine was the same way. I still have it if you want a pic lol. Anthony has pics of his race cast Mahles that all 8 cracked on him too, I just donít remember if he was running stock injectors back then too or not.

Now take the damn lip off the lb7/lly pistons!
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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  #28  
Old 11-06-2017, 06:06 PM
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Quote:
Originally Posted by Chevy1925 View Post
Thatís not uncommon. This is what happens when the lip gets super heated from high duration, high timing tuning. One of the pistons from my engine was the same way. I still have it if you want a pic lol. Anthony has pics of his race cast Mahles that all 8 cracked on him too, I just donít remember if he was running stock injectors back then too or not.

Now take the damn lip off the lb7/lly pistons!
Didnít know that James, my LLY had 6 with cracks in it and they were all on the sides and one had a nice hole, I looked online and couldnít find any cracked like mine, figured timing did it, just didnít imagine thereíd be multiple ones on this truck, I really was surprised.
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Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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  #29  
Old 11-06-2017, 06:13 PM
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Quote:
Originally Posted by Chevy1925 View Post
Thatís not uncommon. This is what happens when the lip gets super heated from high duration, high timing tuning. One of the pistons from my engine was the same way. I still have it if you want a pic lol. Anthony has pics of his race cast Mahles that all 8 cracked on him too, I just donít remember if he was running stock injectors back then too or not.

Now take the damn lip off the lb7/lly pistons!
Similar to running tuning on kill all the time and a heavy foot helping
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2002 Chevy 2500HD LB7 Duramax Summit White CCSB Grey (neutral) leather LT3 pkg OEM bra 4x4, Kennedy Twin Pump Filter Combo Kit, ISSPRO EV, PPE Boost Valve, DTS Built Allison, MikeL Cooler, ATS Billet Flexplate, DTS 3in DS IC pipe, Bill's 5in CAI (White), Big K&N, 4in to 7in black stack, Mickey Thompson Baja Claw TTC 315/75/16 on stock rims, Cognito P&I Brace kit, Sleeves, Energy Sway bar Kit, DD/Puller/Work truck



Special Thanks: (David) DTS, (Guy) Socal Diesel, (Nick & crew) DuramaxTuner, (Dan) PPE, (John) Kennedy Diesel, (Tony) All Season
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  #30  
Old 11-06-2017, 06:15 PM
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Quote:
Originally Posted by Robby Avery View Post
Similar to running tuning on kill all the time and a heavy foot helping
I ran my 120 tune 98% of the time, but the truck weighed 9k and I have a 100 pound foot.
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