Steve Burnfin
New User
I have a 861 that I have been restoring. I bought a rebuild kit new sleeves pistons rings bearings, the works. Built the engine and it started and ran perfectly....for about 5 minutes. The engine started to lug and slow down as it warmed up and suddenly screeches to a sudden stop. You could immediately restart it and it would repeat this and screech to a stop.
I have a friend who happens to be a mechanical engineer, he advised to tear it back down and inspect everything....so I did. Damn.
Upon inspection all 4 pistons have scuffs on 4 sides of the piston skirts on all pistons. These scuffs are bad enough to transfer metal from the sleeves to the pistons. All this happen with less than 20 minutes total run time. Measuring the pistons and sleeves and comparing to the original 64 year old pistons and sleeves the new pistons have .022 clearance with the new sleeves. The original parts have .052 clearance.
I tell you all this
1. To warn others because this is too much work to do twice because of a parts issue.
2. to ask how good is YT in dealing with a warrantee `issue.
Steve Burnfin
I have a friend who happens to be a mechanical engineer, he advised to tear it back down and inspect everything....so I did. Damn.
Upon inspection all 4 pistons have scuffs on 4 sides of the piston skirts on all pistons. These scuffs are bad enough to transfer metal from the sleeves to the pistons. All this happen with less than 20 minutes total run time. Measuring the pistons and sleeves and comparing to the original 64 year old pistons and sleeves the new pistons have .022 clearance with the new sleeves. The original parts have .052 clearance.
I tell you all this
1. To warn others because this is too much work to do twice because of a parts issue.
2. to ask how good is YT in dealing with a warrantee `issue.
Steve Burnfin