[crg]

Any of you fine wrench turners ever do a piston soak to (hopefully) clean up carbon build up on an oil ring?
Seems my 5.7 Tundra with a TRD/Magnuson supercharger has a bad ring on #3 cylinder.
Did a leak down, compression test (wet & dry) and scoped it..def a bad oil ring. All cylinders between 200-210 except the bad one, 145.

The "experts" on the Googlebox seems to recommend a piston soak with Kreen, which i have on the way. Just wanted to see if anyone had any sucess with Kreen or any other methods, with the engine still in the vehicle. I'll try some BG EPR too.

not so pro tip- NEVER buy a used Tundra without doing compression check yourself. And never trust a seller who doesnt know a wrench from a screwdriver.

If I cant clean it up a bit and I get tired of buying oil the ONLY fix is a new short block. Seems Toyota cylinders cant be honed, walls are too thin.

[cmartin]

Kreen, seafoam, mystery oil, pick your poison. I've used the seafoam fogging spray a few times with moderate success. Doenst make sense to me that only 1 ring would land would get dirty, unless the others are close behind.

good luck with it

[crg]

i scoped all the cylinders and the other 7 are nice and clean, good leak down and compression numbers. Its just the one.

I did a BG EPR flush today, i'll do another compression test, leak down and scope before I try the piston soak, then run the tests after.

And i'd be damn happy with moderate success...

[Patrick3000]

How many miles on the Tundra

[D.C.]

I've seen marvel mystery oil do some amazing things.
Try it.

[crg]

the truck just hit 150k, i bought it 03/19 with 123K.
Im pretty good with changing the oil in this one and the wifes Land Cruiser, same 5.7 engine, and her's has over 200k with no issues. I run 0-20 mobile 1 in both.

The previous owner gave me his records and a few oil changes were done at Jiffy Lube and Tires Plus. I'm assuming he didnt change the oil per schedule, used cheap oil and maybe didnt keep it topped off. These 5.7's do consume oil so they need to be checked often.

[crg]

An engine flush with BG EPR and an overnight piston soak with Kreen did wonders. Had 145 psi on cylinder #3 before and 200 after. Had to test it twice cuz i just didnt believe it

Time and miles will be the judge but today I'm sold on both products...side benefit your neighbors will enjoy the amazing smoke show

[cmartin]

Thats pretty amazing, good news.

Time and miles will be the judge

curious to see, check again in a few k miles or maybe just monitor oil consumption?

[crg]

i'll be keeping a close eye on oil consumption. I do have some very slight scoring in the #3 cylinder wall so it's not 'fixed" just cleaned up. it pulls very strong now, tried to attach a video but doesnt seem to allow it.

[HoodPin]

I think I'll order some and try in my upcoming oil changes.