Gjohnson7

Oh and the leak down test on the other cylinders where great. We couldn't hear any air escaping at all on the other cylinders.

Although, I didn't perform a test on any of the other cylinders tonight, just cylinder #2.

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LSX Kouki Project, swap completed in Dec 09

xsublimefrekx

i would just buy another longblock that is good and swap that in and sell the car with a spare motor.

Gjohnson7

Dude, this is the other longblock I bought to swap in. Can you understand my frustration?

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LSX Kouki Project, swap completed in Dec 09

landins13

i have 2 spare heads complete with no issues and i have 3 blocks, pm me if interested

CrazyTrance

Wow man, i can feel the frustration from here. THis stinks really bad man. I hope all turns out well! Best of luck!

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450sx.com

fakts13

it could be that the rings in cyl 2 are a bit stuck from carbon deposits, compression and leakdown tests done on a motor that has been sitting may not always tell the story about the motor. did you try the ATF in the cylinder and then cranking the motor for a couple of minutes? It could help to dislodge some of the carbon in the cylinder. As a last resort, you could just try to start the motor and see if the rings pop. I've had motors before where you could hear the rings pop out right when the motor started. fun stuff. You might as well try right?

s13drob

if you havnt already when you perform the leakdown u got 2 rock the crank back and forth a little when the cylinder is a TDC to make sure the rings sit right. its leakdown procedure.

and it looks like u got the usual carbon buildup on the #2 cyl. intake valves

Gjohnson7

Well, I've tried Atf in the cylinder and it hasn't improved. I poured some down there, cranked the engine and then I even started the engine and let it ran for about 15 mins. Still no dice.

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LSX Kouki Project, swap completed in Dec 09

Gjohnson7

Should I just continue to keep pouring Atf in the cylinder and cranking the engine, trying to get the rings unstuck?

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LSX Kouki Project, swap completed in Dec 09

fakts13

hmmm... if you let the motor run for that long, I'd say it's no good. how was the cross-hatching in cylinder 2? if it's still pretty good, you might be able to just re-ring cylinder 2 just to get everything running.

Gjohnson7

The cross-hatching in cylinder 2 looked fine when we had the head off. I inspected each cylinder when the head was off and every cylinder still had the cross-hatching easily visible.

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LSX Kouki Project, swap completed in Dec 09

fakts13

you should be able to get away with just replacing the rings on cyl 2. best thing to do would be to just lightly hone the cylinder with a drill and honing stone setup to help the new rings break-in and seal well.

Gjohnson7

Well, come to find out my problem isn't a simple piston ring issue. Take a look at what Piston #2 looks like. Apparently the flat spot on this piston wasn't machined in.









Well, I guess it's a good thing I have 4 extra SR pistons laying around.

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LSX Kouki Project, swap completed in Dec 09

Gjohnson7

Oh, does anyone have any idea what would cause this? High boost???

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LSX Kouki Project, swap completed in Dec 09

Gjohnson7

Anyone know where to find a stock rebuild kit with all the gaskets and bearings I'll need?

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LSX Kouki Project, swap completed in Dec 09

Gjohnson7

Alright this is what I am considering. I planning on having the block power washed and having the cylinders honed. Picking up a ring set, rod bearings, main bearings and thrust washers and having the machine shop gap the rings. The 3 other Pistons and rods that were pulled out of the engine are in great shape and I have 4 other SR pistions from my spare engine. Of course I will need to pick up a new headgasket, but all my other gaskets are new considering I bought a complete gasket kit in mid February.

Are there any other things that I am missing? The machine qouted me $25 for the power wash, $50 to hone the cylinders and $65 an hour to gap the rings.

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LSX Kouki Project, swap completed in Dec 09

fakts13

make sure you check piston to wall clearances on all pistons as well as out of round to make sure you aren't going to waste your time with that cylinder that had a bad piston. And in regards to how a flat spot got there the pics are kind of out of focus, but it looks like the ring lands cracked off there. That could be caused by detonation, or maybe the rings were jammed up in the cylinder from sitting too long and when the motor was cranked it busted the lands. If you are going to have the block re-ringed, you might also want to look into replacing the bearings as well, so you have an almost brand new motor to start with.

Gjohnson7

Yeah the ring lands did crack off on that piston.

And I will be picking up new Rod bearings, Main bearings and Thrust washers.

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LSX Kouki Project, swap completed in Dec 09

fakts13

cool, looks like you're all set! good luck with the rebuild!

zavala

i see where you found the busted #2 piston and that sucks!! but, what did the bearins look like in it when you took it apart? i ask cause i recenly did a rebuild on a jeep with the same exact thing, milky vanilla pudding everywhere. turns out he had the headgasket go on it, but it only blew into the oil return passages not the pistons but still taking out the whole motor. coolant eats babbit on bearings like nobodies business and it's not fun. have everything magnafluxed and decked if needed also if the bearings where bad you might want to have them cheack the crank and rods for being out of round. sucks man, sorry

Gjohnson7

The bearings acutally looked really good. I went ahead and pulled all the pistons and inspected the Crank and Bearings and everything all seemed to be in excellent condition.

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LSX Kouki Project, swap completed in Dec 09