Join Date: Nov 2015
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What's the piston to bore clearance? Does it seem to be in spec?
When they honed did, did they have your pistons so they could tell how much to take off?
What's the bore diameter compared to the spec?
Sounds like the bore might have opened up so the ring gapes are larger.
Do you have the old rings? How do their gaps compare?
If the end gap is greater than maximum, replace the piston ring. If the end gap is greater than maximum, even with a new piston ring, replace the cylinder block.
11. INSPECT PISTON RING END GAP (a) Insert the piston ring into the cylinder bore. (b) Using a piston, push the piston ring a little beyond the bot- tom of the ring travel, 105 mm (4.13 in.) from the top of the cylinder block.
|10. INSPECT PISTON RING GROOVE CLEARANCE Using a feeler gauge, measure the clearance between new pis- ton ring and the wall of the piston ring groove. Ring groove clearance: No.1 0.040 - 0.080 mm (0.0016 - 0.0031 in.) No.2 0.030 - 0.070 mm (0.0012 - 0.0028 in.) If the clearance is not as specified, replace the piston.|
techinfo.toyota.com - $15 for 3 days access last I checked and I was able to download the IS and older car information as PDF's. I wouldn't do this job without access to the actual Toyota manuals.
Using forum posts for assembly details is a recipe for disaster.
|But seems max specs for new rings is .015, i show .020" on cylinder #1 , .019 on cylinder #2 , .019 on cyl #3 and so on so i am over by an average of .5 from the factory spec. im thinking due to wear and homing on the cylinders now it does not feel that bad any more ... and if anyone needs info form the actual program i will be also more than gladly share whatever ...|
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