Plain Jane OEM nothing to see here rebuild

[RETed]

Originally Posted by JustJeff

I have gotten myself confused while checking my irons for warpage. I'm confused about the difference between checking for warpage and checking for step wear.

Warpage tolerance is 0.0016
Step wear tolerance is 0.003

Doesn't that mean there are areas on the combustion surface where step wear tolerance is higher/greater than warpage tolerance? I check my tolerance for warpage per the FSM at 4 points. Once I get into oil seal wear area there is an even greater tolerance(0.0008) and my 0.0015 feeler can slide under my straight edge. I'm also taking the straight edge across areas other than the 4 pts in FSM and finding some variations. Can someone help clarify.

Okay, "step wear" is defined by any gouge or valley *under* the measured surface.
I believe the FSM is specific to the areas - the most critical areas are at the 3 o'clock and 9 o'clock positions about 1" from the inner water jacket groove.

"Warpage" is defined by *any* deviation - whether is be "high" or "low" measured along a surface.
Technically, any "wear" (including the above "step wear") should not factor into this warpage inspection.
Warpage is to measure how much deflection out of parallel or perpendicular a surface is...usually across a broad area.


-Ted