I picked up a cheap 2010 with known head gasket issues. Head came off today and piston #1 doesn't reach the top of its cylinder so I definitely have to replace that piston/rod but why not remove all the pistons and hone the cylinders and replace all the rings while I'm at it... Question for the pro's is: Can I install higher tension piston rings so it doesn't have blow-by issues five years later? Are said rings even available? The common title on ebay for new rings is "Piston Rings SET 13011-37110 Fits 2010-2015 Toyota Prius Auris Lexus CT200h"
Do the cylinder walls still show crosshatch? For what it's worth, the Toyota manuals don't recommend honing at all. The cylinder sleeves are very thin. Toyota would replace the block if the original crosshatch doesn't show. Here on PriusChat you can of course find people choosing not to go strictly by-the-book, and getting away with light honing.
There is an update kit that they started using in mid 2014, and then 2015. Pistons and rings. You "might" still be able to get just the rings for the original pistons. According to other's who have tried, the new rings are not compatable with the old pistons. But, you'll have to measure the cylinders to make sure they are not oval. If they all check out okay, you would want to hone them out so the new rings will seat in correctly. If you want them to last a long time. Honing, if done correctly, only cleans up the surface, and makes new cross hatch paterns. You don't want to hone too long or too much.
Check with Deves or jahns custom Pistons in California . I would think you would be able to use two ZZ Pistons from Corolla and the non- Atkinson cycle whatever it is engine and then aftermarket manufacturers probably make regular tension rings in the diameter you need for your pistons and thickness and all that I used to do all of this stuff 30 years ago quite a bit. Many of the companies and the suppliers have changed but most of the activities are still reasonable and achievable they weren't using really low tension rings when I was doing lots of engine work so it wasn't an issue or an option I know deves was an outstanding spring steel ring maker for many years they may be out of business but somebody's picked up where they left off Jahns had or has quite a bit of experience with Toyota He did a lot of work with Pistons and slugs for Toyota engine when TRD was on the come up that was a long time ago but I'm sure you can probably round up regular tension rings reasonable oil control rings and all of that that will fit the existing grooves on pistons you have I don't know if these engines are stamped on the oil pan mating surface with the necessary numbers that dedicate your bearing and piston sizes and all that they were doing that for a while I don't know what they do now as most engines today pretty much are throwaways unless there are other reasons to do something else
I would think you'd have to do some hella honing to ruin the cylinder liners and of course you're going to be using a ball hone in the right size we hope not the straight three stone silly looking thing those are no longer recommended to be used.
You need new pistons and rings from Toyota updated to fit. See the video in this link. He lightly hones as well. Decent Replace 1.8L Pistons and Rings Video - Engine Out | PriusChat
The video linked in post 6 is just what you need for piston/ring replacement (the revised rings require revised pistons). Attached TSB has part no's for the revised pistons/rings, head bolts, and a gasket kit (includes head gasket). Someone here recently mentioned they did piston/ring replacement without engine removal, fwiw, just removing lower and upper oil pans from below.
"Piston #1 does not reach the top of the cylinder"? Are you referring to the stroke...as in the up and down movement of the piston?
I got the piston out and rod is both bent & twisted. Wasn't my fault at least since I bought it this way for cheap. To look at the glass half full the rod didn't snap and destroy the block. New pistons & rings and rod and I'll see if I can get it running properly.
Correct. This started out as a head gasket replacement. Once I got the head off, the crank was at TDC and piston #4 was at the top of cylinder4 but piston #1 was about 3/16" below the top of cynlinder1. An oh-crap moment.
Get a 3 stone hone, and lightly hone. I take it you know how to use a hone??? And do just enough to get the glaze off. Then you can really see if they are correct. Measuring them is the smartest thing to do. You can't really "look" at the walls and tell of they are oval or not.
If the stroke is 3/16" "short" on one cylinder...you better check the crank too. You should consider a full engine teardown/rebuild/replacement.
