wildjyoung
Member
I sent a sample of oil into Blackstone Labs after my rebuild. The engine ran so well I expected good results; however I was surprised to find very high lead, copper, and tin which they say can only come from the bearings. I am unable to attach the report.
Copper was 553 PPM, Lead was 263 PPM, and Tin was 16PPM. Viscosity was 7.6 cSt. The oil had 4.6% fuel which caused the low viscosity. The oil had 4 hours on it.
The crankshaft is an Eagle and bearings are clevite 77. Everything was balanced and measurements were taken. Plastigauge was used to verify clearances.
Can anyone provide their thoughts on the report? Am I doomed to pulling the motor out and putting new bearings in it?
Thanks for your help!
Copper was 553 PPM, Lead was 263 PPM, and Tin was 16PPM. Viscosity was 7.6 cSt. The oil had 4.6% fuel which caused the low viscosity. The oil had 4 hours on it.
The crankshaft is an Eagle and bearings are clevite 77. Everything was balanced and measurements were taken. Plastigauge was used to verify clearances.
Can anyone provide their thoughts on the report? Am I doomed to pulling the motor out and putting new bearings in it?
Thanks for your help!