Hey Guest!
Hi,
I’m new to this forum and am hoping someone out there with knowledge of rebuilding can give me their opinion. I’m rebuilding an xpag (1250 motor )and have heard different thoughts on how much clearance to give to the bearings. The machinist has my block , crank and .020” under main and rod bearings. He’s going to grind the crank but is asking how much clearance I want? When I look in the Bentley manual, it says the range is between .0008”-.003 for mains and .0005”-.002” for big ends of the rods. I’m trying to balance keeping clearances tight enough to keep good oil pressure and providing adequate oil flow. My machinist is a good tech, but lacks the experience with these motors. Does anyone out there have thoughts about this? I’m considering telling him .0015 for mains and .001 for rods.
Thx
I’m new to this forum and am hoping someone out there with knowledge of rebuilding can give me their opinion. I’m rebuilding an xpag (1250 motor )and have heard different thoughts on how much clearance to give to the bearings. The machinist has my block , crank and .020” under main and rod bearings. He’s going to grind the crank but is asking how much clearance I want? When I look in the Bentley manual, it says the range is between .0008”-.003 for mains and .0005”-.002” for big ends of the rods. I’m trying to balance keeping clearances tight enough to keep good oil pressure and providing adequate oil flow. My machinist is a good tech, but lacks the experience with these motors. Does anyone out there have thoughts about this? I’m considering telling him .0015 for mains and .001 for rods.
Thx