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By Maybelle lee - 14 Years Ago
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I just had my engine rebuilt and after approx 150 miles my adjusting screws on the right side of my engine come loose. I have already broke 3 push rods on that side and the knocking it produces sucks also. So do I need new adjusting screws? Or do I need new rocker arms? Also, every time I pull the valve cover off on the right side it is real gummy and black, and the push rods look dry. On the other hand The left side looks great. The oil looks great, everything is lubed up and adjusting screws never come loose. So whats going on on the left side?
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By LON - 14 Years Ago
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I would be have a strong word with the guy that rebuilt the motor .Find out what he did to "Rebuild " your motor ????.Or was it a re-ring & bearings and a can of spray paint ??? If you remove the rockers that are not getting oil ,crank over motor ,& oil appears from oil hole in head ,you may just have clogged ( or incorrectly installed ) rocker shaft.If no oil appears from oil hole you may have a spun cam bearing ???? Broken push rods don't sound real healthy as well ??? I can't say what I would do to the guy that rebuilt your motor ,there maybe children listening .Good luck . Lon
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By Talkwrench - 14 Years Ago
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sumthin' ain't right.. broken push rods ??!!!
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By Rono - 14 Years Ago
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Monkeyboots80; As Lon mentioned, your problem could very well be a rocker shaft installed incorrectly. The center hole in the rocker shaft must be aligned with the hole in the center rocker stand. If you are getting plenty of oil to one head but not the other, I wouldn't think it would be a problem with the cam bearing. Rono
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By John Mummert - 14 Years Ago
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Chances are if the cam was replaced the groove in the center journal is not deep enough. This is a recurring problem and your symptoms match it exactly.
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By Maybelle lee - 14 Years Ago
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so as far as trouble shooting... what would be my first logical step? If that dosn't help what would be next? Thanks for all your help!!
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By PF Arcand - 14 Years Ago
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1st step probably will to be remove the rocker assembly on the bad side & check to see if the shaft is installed incorrectly. Unfortunately, if they have been running dry they likely need some reconditioning anyway. Was the work done a complete rebuild inclulding a new Cam? If so, and the rocker shaft assembly is correct, than John Mummert's advice is likely next..
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By DANIEL TINDER - 14 Years Ago
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[quote][b]LON (5/31/2011) If no oil appears from oil hole you may have a spun cam bearing....
Or (not unheard of), the guy just forgot to clean out the plugged oil passage in that head. Sometimes the sludge is so bad in poorly maintained motors they have to be drilled out.
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By lovefordgalaxie - 14 Years Ago
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I saw this happen on a F-100 272 engine. The guy asked me to adjust the valves, and one side was dry.
The problem was the passage in the head, that was clogged. If it's the "passenger" side of the engine that's running dry, you may have a problem at the timming chain also, because there is little to no oil going there. If it's the "driver" side, your cam/distributor gear can be starving oil.
Never a good thing tough.
The broken pushrods are very strange, never saw that happen. I saw bent pushruds, but never broken.
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By Maybelle lee - 14 Years Ago
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As far as the push rods breaking... They are breaking at the mushroom tip. And they are original. So as soon as I get a day off Im gonna remove the rocker assembly and see if it was installed correctly...then I will go from there. Stay tuned and thanks again for all your help.
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By Ted - 14 Years Ago
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The lack of oil can create a situation where the pushrods can fail simply from the heat that’s being generated. Some brands of replacement pushrods also have down sized sockets or cups at their tops which keeps the ball on the adjuster from firmly seating within the pushrod. This causes the adjuster to rest on the outer edge of the pushrod cup and break it out.
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By aussiebill - 14 Years Ago
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Ted (6/2/2011)
The lack of oil can create a situation where the pushrods can fail simply from the heat that’s being generated. Some brands of replacement pushrods also have down sized sockets or cups at their tops which keeps the ball on the adjuster from firmly seating within the pushrod. This causes the adjuster to rest on the outer edge of the pushrod cup and break it out.Yes ted, you,re exactly right, some of the aftermarket p/rods have small cups and then they split and fail, its happened to me on one application.
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By oldcarmark - 14 Years Ago
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The pushrods are originals apparently.Close inspection of the cups would likely show small cracks developing.Lack of oil will make it harder for the rockers to turn on the shaft once they get heated up as Ted mentions.A combination of deteriorated cups and lack of oil would explain why they are breaking.You should also disassemble the rocker shaft assembly and see how badly the shaft is scored from lack of oil.Quality aftermarket pushrods are a little thicker and stronger and have better cup ends than the originals.
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By MoonShadow - 14 Years Ago
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There have been problems with the cup size on push rods. Some push rods sold as Y-Block are not. The cups are a little smaller and the ball on the rocker arm does not fit down in the cup far enough. As a result the ball rides high on the upper edges of the cup and the cups can break out. Usually the sides break. If thats how yours are broken then you need to check your push rods for fit. The ball should set well down into the cup. You still need to check the installation of the rocker shaft for oil flow. Hope this helps. Chuck in
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By Maybelle lee - 14 Years Ago
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It turns out the Rockers were from 1958 and were so clogged I was not getting oil. I replaced the rockers and everything is great now..... Now the next problem I have is a rough Idle and the gen light coming on.
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By PF Arcand - 14 Years Ago
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Can we assume then, that your engine was not completely overhauled? Is the rough idle at a really slow speed? If the Generator light flickers, it needs a decent idle speed to kick in at all.
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