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Author Topic: Broken rocker arm  (Read 1307 times)

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d-rock

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Broken rocker arm
« on: April 17, 2006, 08:17:11 PM »
While out for a ride today I heard somthing break and then only one cylinder was running. The rocker arm broke off on the intake side of the rear cylinder, the end of the arm on the pushrod snapped right off.  :( Now if they were stock arms it would have been covered under the srevice plan, but I bought the SE roller rockers (so they wouldn't break!!) and it broke. No other damage to the motor. Has anyone else had this happen of am I just the lucky one again.
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113 inch S.E.
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HUBBARD

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Re: Broken rocker arm
« Reply #1 on: April 17, 2006, 08:51:27 PM »
Quote
While out for a ride today I heard somthing break and then only one cylinder was running. The rocker arm broke off on the intake side of the rear cylinder, the end of the arm on the pushrod snapped right off.
« Last Edit: April 17, 2006, 09:36:52 PM by HUBBARD »
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DCFIREMANN

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Re: Broken rocker arm
« Reply #2 on: April 17, 2006, 09:32:02 PM »
Hub it's a first for me also. DROC what did the head of the pushrod looklike???? I have heard of problems there with the SE adjustables.


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UK Dave

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Re: Broken rocker arm
« Reply #3 on: April 18, 2006, 08:07:54 AM »
I had a rocker arm break on a car I had some time ago (like about 30+ years!!!)

It was a Hillman Avenger - sold as the Plymouth Cricket in the US I believe?

It wasn't a very sporty car but had twin Strombergs, dual valve springs (thick outer, thin inner) and a slightly "hotter" camshaft - I think it produced about 75bhp and 90ft/lbs Tq - than the cooking versions.

Anyway -

I took the head apart to replace the rocker arm and found an inner valve spring had broken and become wedged in the coils of the outer thus stopping it from compressing and hence the rocker broke.

No other damage at all but I stripped the head, re-ground the valves and de-coked the head (remember those days) while I was in there. All very easy in those far-off 'simple' days

The valve spring thing is probably not applicable in this case but it just got me remembering...

Cheers

Dave
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d-rock

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Re: Broken rocker arm
« Reply #4 on: April 18, 2006, 09:14:39 AM »
Hubbard,
I am runnin the SE 264 cams. There was no warning it was running great then snap. I also think that the rocker was bad from the start and was only a matter of time before failure. I have just under 1000mi on the new 113.The pushrods are the perfect fit not ajustable ones and it looks fine not even bent. The new Jims rockers just came in this morning, I know there the same as the SE rockers but just want to try a diffrent name I guess. This motor has 122hp and 121 ft-lbs of torque but is no reason for the failure.IMO  D-roc
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113 inch S.E.
The parts list will never be put in writing :)
 

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