Heya Bergers.
The short version:
I have no way to measure my liner in order to spec a replacement piston.
The long version:
Some bearing noise and steel shavings on my drain plug inspired me to finally tear down my 2008 FE550 after 210 hours. I found my main bearings were toast (as expected), with some light scoring on the piston and liner.
I'm inclined to reuse the liner as-is and replace the piston. For that, I need to size the bore. Since I don't have the right tool for that job, I went to the only engine machine shop in town and slipped them a fiver to measure it up. I was told that it was 3.932 inches.
When I got home I converted that over to metric (99.87 mm) and checked my shop manual which gives the size 1 liner spec as 100.000 to 100.012 mm. Something clearly didn't add up here, so I went back to the machine shop and asked them to double-check. They checked again, apologized for the error in the first measurement, and revised their number to 3.942 inches.
Again, I went home and checked the converted number (100.127 mm) against the specs. This time, it's way over even the size 2 liner maximum of 100.025 mm. At this point, I'm pretty sure the machine shop is not providing anything close to an accurate number.
I'm giving up on the shop measurement, and I'm wondering if anyone has any advise on how to proceed. I'm going with a ProX piston, so that leaves three options: 99.95, 99.96, or 99.97 mm. Is it reasonable to just go for the mid-sizer as a guesstimate?
The short version:
I have no way to measure my liner in order to spec a replacement piston.
The long version:
Some bearing noise and steel shavings on my drain plug inspired me to finally tear down my 2008 FE550 after 210 hours. I found my main bearings were toast (as expected), with some light scoring on the piston and liner.
I'm inclined to reuse the liner as-is and replace the piston. For that, I need to size the bore. Since I don't have the right tool for that job, I went to the only engine machine shop in town and slipped them a fiver to measure it up. I was told that it was 3.932 inches.
When I got home I converted that over to metric (99.87 mm) and checked my shop manual which gives the size 1 liner spec as 100.000 to 100.012 mm. Something clearly didn't add up here, so I went back to the machine shop and asked them to double-check. They checked again, apologized for the error in the first measurement, and revised their number to 3.942 inches.
Again, I went home and checked the converted number (100.127 mm) against the specs. This time, it's way over even the size 2 liner maximum of 100.025 mm. At this point, I'm pretty sure the machine shop is not providing anything close to an accurate number.
I'm giving up on the shop measurement, and I'm wondering if anyone has any advise on how to proceed. I'm going with a ProX piston, so that leaves three options: 99.95, 99.96, or 99.97 mm. Is it reasonable to just go for the mid-sizer as a guesstimate?
