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1999 Ford Ranger 3.0 Vulcan Bending Pushrod on Cylinder 5 Exhaust Valve?
So I have a 1999 ford ranger with the 3.0 l Vulcan engine. It has 269,000 miles on it. It hasn't done this before as far as I know (haven't owned it for very long, and no it hasn't happened before this is an original ford Pushrod). Anyways the Pushrod bent when I went up a large hill. I took the valve cover off an replaced the bent rod. Drove it about 20 miles not real problems was running much better may have misfired a time or two. But I had never cleaned the plugs from before when they were fouled. Anyways drove 20 miles and started up a big hill again and bang bent the same rod again. Took it apart again and not only had it bent the same rod but it bent the same exact way. What the hell is going on. Is it timing related, is the valve seizing in the guide is the cam lobe got a problem or is there something wrong with the lifter. Hopefully someone out there has had this happen before. I am mechanically knowledgable so don't worry about using acronyms or complicated automotive things. I'll know what your talking about. Additional info. Rocker is fine, valve moves up and down smoothly when pushed, and the lifter appears to be fine, but I haven't not pulled he lifter out and actually inspected it. This isn't happing on any other valve. All the cylinders have good compression however at the time cylinder 5 only had 120. But I figured the walls had been washed down by fuel. Help please If you can. Thanks.
7 Answers
- Anonymous6 years ago
This Site Might Help You.
RE:
1999 Ford Ranger 3.0 Vulcan Bending Pushrod on Cylinder 5 Exhaust Valve?
So I have a 1999 ford ranger with the 3.0 l Vulcan engine. It has 269,000 miles on it. It hasn't done this before as far as I know (haven't owned it for very long, and no it hasn't happened before this is an original ford Pushrod). Anyways the Pushrod bent when I went up a large...
Source(s): 1999 ford ranger 3 0 vulcan bending pushrod cylinder 5 exhaust valve: https://tr.im/WrOq4 - Me BrodLv 66 years ago
Not a valve timing issue, all the exhaust valves / pushrods would be effected.
Not a cam lobe failure. Valve would just not open as far.
Check the valve spring pressure. I believe its either causing valve to "hang up" resulting in piston contact or a weak valve spring is not forcing a "galled" lifter to return to the cam base circle, resulting in piston contact.
I vote either valve guide or lifter bore issues, due to weak valve spring.
Update: It seems you are not alone on the valve spring issue. Google:
Ford Ranger 3.0 Valve Springs. There is a forum talking about your issue.
Guess which cyl? #5 H-M-M-M-M
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- Anonymous6 years ago
Check to see if it has dual valve springs, a broken inner spring will cause this. If the spring is fine then you have a bad lifter or rocker arm for sure.
If the valve was hitting the piston you would have a bent valve for sure! the bind up has to be stopping the push rod from moving but it's not the valve that's stopping it.
- Harley DriveLv 76 years ago
somehow the valve is hitting the piston , probably the camshaft has jumped a tooth or if it has variable valve timing that has failed
