[Build Thread- Twincharged LE5] Brand new engine has milky gunk inside
04-29-2017, 11:29 AM
#1
Moderator
[Build Thread- Twincharged LE5] Brand new engine has milky gunk inside
Obviously, this means there was water in the oil but from where? The other day i noticed my colant was about an inch low, but its a new engine with 80 miles on it, figured maybe i burped some air out while driving. Filled it back up and didnt think too much of it.
Yesterday i was at a car meet, decided to check my oil and it definitely looks like a milky brown color on the dipstick. I also notice the coolant has gone down a small amount since then. So i take the car home (only like a mile drive) and put it back in the garage while i go get a coolant system pressure tester.
Started pressurizing the system and notice that my radiator is leaking where the end tank is crimped on... well that explains a loss of coolant but not why my oil looks milky... I took the coils and spark plugs off and was looking into the cylinders while pressurizing the coolant and i never saw nor heard any water getting into the cylinders. I did a compression test and got 178-150-165-151 which isnt great for a new engine but also doesnt indicate a whole lot of issues.
Today i plan on draining the oil and possibly pulling the oil pan to see if water is leaking inside of the block somewhere. Id like to hear some ideas from you guys, but i will also be updating this post with progress throughout the day.
Background on the engine:
zzp girdled 2.4 with fresh hone
New 88.5mm wiesco pistons
Molnar rods
All new gm bearings
Used head i had lying around
Used water pump
The oil in the engine only has about 45 miles on it and is castrol 15-40 i was using for break in before i switch it to Mobil 1.
Any input is appreciated.
Yesterday i was at a car meet, decided to check my oil and it definitely looks like a milky brown color on the dipstick. I also notice the coolant has gone down a small amount since then. So i take the car home (only like a mile drive) and put it back in the garage while i go get a coolant system pressure tester.
Started pressurizing the system and notice that my radiator is leaking where the end tank is crimped on... well that explains a loss of coolant but not why my oil looks milky... I took the coils and spark plugs off and was looking into the cylinders while pressurizing the coolant and i never saw nor heard any water getting into the cylinders. I did a compression test and got 178-150-165-151 which isnt great for a new engine but also doesnt indicate a whole lot of issues.
Today i plan on draining the oil and possibly pulling the oil pan to see if water is leaking inside of the block somewhere. Id like to hear some ideas from you guys, but i will also be updating this post with progress throughout the day.
Background on the engine:
zzp girdled 2.4 with fresh hone
New 88.5mm wiesco pistons
Molnar rods
All new gm bearings
Used head i had lying around
Used water pump
The oil in the engine only has about 45 miles on it and is castrol 15-40 i was using for break in before i switch it to Mobil 1.
Any input is appreciated.
Last edited by Slowbalt2000; 05-19-2017 at 01:53 AM. Reason: Because I can
04-29-2017, 07:55 PM
#9
Member
Damn man I'm sorry to see that, I feel like an ass for bothering you earlier, I didn't even know this was going on! Keep us posted on what you find out, best of luck man!!
Last edited by Cobalt_noob; 04-29-2017 at 09:04 PM.
05-01-2017, 10:55 AM
#15
you can check a head/deck with a straight edge to see if its flat before wasting money/time on a machines who will deck the head. Usually its only warped if it got super hot and/or its old.
I straight edged my LSJ head and ecaulk and I spent about 3 hours each sanding and polishing it to make sure it was clean.
I straight edged my LSJ head and ecaulk and I spent about 3 hours each sanding and polishing it to make sure it was clean.
05-01-2017, 12:31 PM
#17
Senior Member
iTrader: (6)
you can check a head/deck with a straight edge to see if its flat before wasting money/time on a machines who will deck the head. Usually its only warped if it got super hot and/or its old.
I straight edged my LSJ head and ecaulk and I spent about 3 hours each sanding and polishing it to make sure it was clean.
I straight edged my LSJ head and ecaulk and I spent about 3 hours each sanding and polishing it to make sure it was clean.
05-01-2017, 01:20 PM
#18
i know most havent seen a porous 2.4 gen 2 block, but there has to be a reason zzp doesnt stand behind them. being the same design block as an lnf, the potential for the issue is there. im thinking maybe we see the issue with lnf blocks is because every lnf is boosted and making at least 260/260. i know nobody has tried to correlate the porous issue with power level as it seems luck of the draw. my thought on why nobody has seen a porous le5 is maybe at n/a power levels it wont have the issue, and there arent enough boosted le5s to get a proper gauge on it. in reality, what is the percentage of lnf's that have the issue? under 5% of total production?
its not that im hoping this is the problem, quite the opposite. it sucks to build an engine and have a major issue with it. however building engines and transmissions has taught me, if the problem isnt clear keep looking, putting it together again without finding a clear problem is just going to bite you. if the deck and head are flat, something else is going on.
its not that im hoping this is the problem, quite the opposite. it sucks to build an engine and have a major issue with it. however building engines and transmissions has taught me, if the problem isnt clear keep looking, putting it together again without finding a clear problem is just going to bite you. if the deck and head are flat, something else is going on.
05-01-2017, 01:44 PM
#19
I will be pressure testing it again with the new gasket to see if it still leaks. Thing is le5s are a different casting than the lnf and started production before the 86mm blocks did.
Ill be reporting back with results of the pressure test once the new gasket is on.
Ill be reporting back with results of the pressure test once the new gasket is on.
