Stock Rocker Arm Broke!!! Help!!!
Stock Rocker Arm Broke!!! Help!!! My car was missing today and making a loud valvetrain noise, so I shut it off. I checked the rocker arms and #8 cylinder intake rocker broke in half and was riding on titanium retainer. I was not beating on it at the time. WHats causes this and has it happened to anyone else?
They lose the needle bearings after time, its like luck of the draw. Once all the needle bearings fall out and you run it with no bearings it will get very noisy and eventually fall apart. Its happened to me before, not much of a big deal, just replace it with another one. I got one if you want it, just pay the cost of shipping.
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Joined: Jun 2004
Posts: 418
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From: Houston, Tx
So with needle bearings floating around in the oil, I assume this would require pulling the motor and possibly a rebuild? Are there any aftermarket rockers that use something other than needle bearings? THx!
No rebuild required, the bearings will fall down the valley and sit on the magnetic oil drain plug. Its a fairly common thing with these rockers and really is not a big deal.
Because it happened to a buddys car. Very simple actually: Tip of rocker arm breaks, the rocker arm comes down after tip breaks and all it can reach when the engine is turning is the side of the retainer, it then pushes the retainer down and knocks the locks lose and drops a valve.
Im wanting to know what causes this?
Im wanting to know what causes this?
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Pushing down on just the retainer might have bent the valve.
Suprised it didn't spit out the keeper parts and really mess stuff up.
I bet that retainer is chewed up.
Your lucky if that is all that happened is a broken rocker.
Suprised it didn't spit out the keeper parts and really mess stuff up.
I bet that retainer is chewed up.
Your lucky if that is all that happened is a broken rocker.
Post some photo's. Likely fatigue from an overstress condition, which could be the result of valve float for example. How did you shim the Cranes? They have very low seat loads without shims.
Just used titanium seats. I have installed 3 sets of these springs and never anything like this.
They set up at (from memory) 112# on the seat at an installed height of 1.800. The Crane seat will decrease the installed height to around 1.77". Without shims, mine set up at 122# on the seat, too low in my opinion for an aftermarket cam. A 0.060" shim would put you in the neighborhood of 140 on the seat, a better value in my opinion.
