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#65847 09/16/2006 6:23 PM | Joined: Sep 2004 Posts: 19 New Guy | | New Guy Joined: Sep 2004 Posts: 19 | After driving my perfectly running 1960 235 for three months it suddenly began running poorly during a 30 mile trip. I was nearly home at the time and eased on to the house. After pulling the valve cover I discovered two broken push rods. They were broken right at the rocker arm. Actually the cup that holds the rocker had a portion of the side broken out. One was worse than the other allowing the push rod to lean over and the valve was not opening. Both push rods were on exhaust valves. What could be the cause of this sudden failure and what could be it's fix? | | |
#65848 09/16/2006 6:30 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | daleandmelba,
I don't think it was a "sudden" failure. This is where the pushrods wear and this is where they fail.
If you look at the remaining pushrods, you might possibly see cracks starting to form in this little seat area.
The caveat would be to make sure your top end is getting oil. You will have to run the engine with the valve cover removed and watch for drips and dribbles. This system won't spray the oil.
If your rig has solid lifters, now would be a good time for a valve adjustment, and maybe a set of new pushrods!
Stuart | | |
#65849 09/16/2006 7:26 PM | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Stuart is probably right about wear & tear. Stuck valves is a remote possibility. That would normally bend the pushrod but if the end cups were cracked they would probably fail there first.
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#65850 09/22/2006 5:36 PM | Joined: Sep 2004 Posts: 19 New Guy | | New Guy Joined: Sep 2004 Posts: 19 | Stuart was right on the money. After replacing all the pushrods I found only 3 that weren't cracked or broken. What seems like a silly question to an old hand can be a huge help to a novice like me. My engine is running smooth again and I thank you guys for your help. Dale | | |
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