New LS7 is hurting...
07-28-2023, 02:49 PM
#21
White smoke is water. AF and oil makes chocolate milk. That paired with the knock = new engine
Get a camera and look through plugs. See if anything let go. drain oil, if its milk drop pan. You will find the issue.
Get a camera and look through plugs. See if anything let go. drain oil, if its milk drop pan. You will find the issue.
07-28-2023, 03:15 PM
#22
yes. Chad golen. He did not build it. The shop I had the heads done consulted him on the rust on the cylinder walls and setting the preload on the johnson lifters after measuring. He advised to scuff them out. there was not deep pitting, but enough niticable rust and that was after I had broken it in!!
07-28-2023, 03:19 PM
#23
This is my second failure after heads cam in 1 year. LS3 dropped valve and brand new LS7 crate replacement here..
Not sure my tolerance to rebuild. Or get from under it.
07-28-2023, 03:44 PM
#24
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OP you most likely have issues in the bottem end. You can rent a borescope from the local parts store and look into each cylinder to inspect for any visible signs of damage and draining the engine oil will also give some insight. If coolant did get into a cylinder and cause hydrolock it can bend the rods and even break them as well as damage the engine block. If coolant gets into the oil pan it can waste the engine bearings which would be visible in the engine oil. I would drain the pan to see but irregardless the engine needs to come out.
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Rich2342 (07-28-2023)
07-28-2023, 03:54 PM
#25
OP you most likely have issues in the bottem end. You can rent a borescope from the local parts store and look into each cylinder to inspect for any visible signs of damage and draining the engine oil will also give some insight. If coolant did get into a cylinder and cause hydrolock it can bend the rods and even break them as well as damage the engine block. If coolant gets into the oil pan it can waste the engine bearings which would be visible in the engine oil. I would drain the pan to see but irregardless the engine needs to come out.
Got it.
Possible install error w the head gasket. There were fumes of anti freeze a few weeks ago. Car ran fine though.
I need remedies like what can i sell the engine as is for, go different direction?
Or
Are there any LS blocks 4.125 bore w assembly ?
Weigh each option.
Thats my thought process
The milk is spilled. How to fix or walk away?
07-28-2023, 03:57 PM
#26
If you pull the plugs, turn the engine by hand. If you can't you have a lot of tearing down to do.
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Old Buzzard (07-29-2023)
07-28-2023, 05:39 PM
#27
Seems louder on pass side from top view. But…video underneath says it’s a rod. White smoke would tell me coolant, so that’s a headgasket or cracked head…which could have hydro locked a cylinder and bent a rod…but not usually at 7k rpm. That rpm usually makes a big mess with holes…
Heres where you should start and it’s the easy stuff…
1. Pull valve covers and look for springs/valves, or rocker issues
2. Pull spark plugs and inspect plugs. Plugs tell a lot of data
3. Pull the oil filter off and cut it open with the correct $40 tool. The filter element tells a lot of data also.
4. Look for coolant in the oil, or oil in the coolant.
From these 4 steps, you should have a direction to go. Keep us posted.
Heres where you should start and it’s the easy stuff…
1. Pull valve covers and look for springs/valves, or rocker issues
2. Pull spark plugs and inspect plugs. Plugs tell a lot of data
3. Pull the oil filter off and cut it open with the correct $40 tool. The filter element tells a lot of data also.
4. Look for coolant in the oil, or oil in the coolant.
From these 4 steps, you should have a direction to go. Keep us posted.
I pulled the covers. I believe there are coolant issues mixed w oil. milky.. rockers, springs and valves are in tact.
Thats as much as I can tell so far. Coolant without runnjng the car is low in the radiator as far as I can see and the dexcool overflow, bone dry.
07-28-2023, 07:14 PM
#28
Pull the plugs. Check for signs of detonation (white specs around the edges), broken porcelain or bent ground strap, oil or coolant residue around the end of the plug.
07-29-2023, 08:51 AM
#30
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That bent ground strap is telling. I'd take a peek into that cylinder with a borescope. BTW what plugs are you using because you should be running ones with a washer which are designed for Brodix heads or you risk damaging the threads, I didn't know this and was using the NGK Iridium TRX 7 IX and made the switch to NGK R5671A-7
Last edited by 01CamaroSSTx; 07-29-2023 at 08:58 AM.
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G Atsma (07-29-2023)
07-29-2023, 09:27 AM
#31
TECH Senior Member
#7 bent ground strap is a MAJOR tell, as 01CamaroSSTx indicated. It got pounded into that shape.
07-29-2023, 10:04 AM
#33
TECH Senior Member
Pounded physically, BUT some serious heat could well play into it.
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Rich2342 (07-29-2023)
07-29-2023, 11:36 AM
#34
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Hopefeully that rod didn't let go and smack the cylinder head and then the valves pushed the piston back down into the hole. Fingers crossed!
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G Atsma (07-29-2023)
07-29-2023, 02:27 PM
#36
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Could be it was rod bearing failure and the rod didn't let go but it was enough to make contact with the end of the plug and hopefully that's the case here. If the valves took damage you could probably see that by removing the valve cover.
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G Atsma (07-29-2023)
07-30-2023, 12:08 PM
#37
TECH Enthusiast
I am wondering if plug went too far in because there was no washer stopping it. The BR7 plugs take a different style plug that was mentioned earlier. It would have gotten other plugs but maybe this one was just in right spot. Good luck with investigation.
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01CamaroSSTx (07-30-2023)
07-30-2023, 12:44 PM
#39
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See post #30
07-30-2023, 12:59 PM
#40
That bent ground strap is telling. I'd take a peek into that cylinder with a borescope. BTW what plugs are you using because you should be running ones with a washer which are designed for Brodix heads or you risk damaging the threads, I didn't know this and was using the NGK Iridium TRX 7 IX and made the switch to NGK R5671A-7
Looks like the TR7IX. I dont recall if LME sent them like this or if the shop installed them.
Are they they too long? Or just diffetent thread?