Runnin'OnEmpty
Explorer Addict
- Joined
- July 20, 2002
- Messages
- 2,081
- Reaction score
- 126
- City, State
- Southeast USA
- Year, Model & Trim Level
- 2000 Sport
Another broken crankshaft has come to my attention; on a 98 Ranger 4.0. The crank always snaps right behind the harmonic balancer, with no warning, and at mileages somewhere between 60K and 130K miles. It apparently happens to both the OHV and SOHC engines.
Various theories have been presented: Bearing tolerance "stack-up" during assembly, oil changes extended too far, belt tensioner being too strong, crank forging defects, over-revving, etc....
The purpose of this poll is to see if there's anything common to the failures; such as model years, oil type that's used, driving habits, OHV vs SOHC, etc. Please post any info you're aware of on this problem.
Thanks.
Don
Various theories have been presented: Bearing tolerance "stack-up" during assembly, oil changes extended too far, belt tensioner being too strong, crank forging defects, over-revving, etc....
The purpose of this poll is to see if there's anything common to the failures; such as model years, oil type that's used, driving habits, OHV vs SOHC, etc. Please post any info you're aware of on this problem.
Thanks.
Don