- Joined
- Oct 28, 2022
- Messages
- 20
- Reaction score
- 0
- Points
- 1
- Location
- greenfield mo 65661
- Vehicle Year
- 2000
- Make / Model
- ford fanger
- Transmission
- Automatic
okay-here's the deal-My cousin has a 2000 4.0 ranger that quit while driving down the road-a compression test showed it had less than 20 pounds of pressure so the heads were pulled and the exhaust valves were beat down in the head about 1/8 of an inch so the heads were sent to a machine shop and found to be cracked so a brand new set of heads were ordered as well as a new set of lifters and oil pump-when the engine was reassembled it started and ran about 15 seconds until it built full oil pressure and died-no compression again-what could anyone suggest as could be the cause? we are at our wits end-to edit- the valve seats were beat out on the exhaust valves-the valves were not bent-the seat were beat out so the valves were sunk into the head and the stems were about an eight of an inch higher than the intake so we figured the exhaust valves were being held open but the new heads and lifters and oil pump have the same problem-it seems they are being pumped up and holding the valves open
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