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Old 02-20-2007, 12:24 PM   #1 (permalink)
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Broken rocker arm!

Has anyone heard of a engine breaking exhaust rocker arms???? This is a new one on me. This guy had injectors put in at a performance place in Weatherford, TX. that is known for screwing up trucks. Drove it for about 500 miles and then started falling on it's face. I really dont see how an injector install could have caused this. I know that the exhaust rocker arms must be removed to install injectors, but even if they were installed with too much torque on the bolt that it would break or just damage the pivot shaft. Any ideas???????
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Old 02-21-2007, 05:26 PM   #2 (permalink)
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Actually, this is a fairly common situation when performance injectors are installed and the valves are not properly adjusted before the user nails the throttle. Almost always is user error because they failed to do routine maintenance.

It can also be bad timing of the injection pump if it is a VE or P pump engine, or a failing injection pump timing piston if it is the VP pump. If it is a CP3 (common rail) system, then it is improperly adjusted valves only.

Most simple injector replacements are done without checking the valve clearance unless the person requesting the service specifies and pays for such to be done.

The rockers are not removed during an injector swap.

When this happens it nearly always turns out to be a bent pushrod or broken lifter, and very seldom is a broken rocker or galled rocker shaft. What happens is the additional cylinder pressure from the richer fueling mix igniting drives a valve back into the valve seat and bends the pushrod or breaks the lifter, or both.

If it is a 24 valve, then I would also recommend using rocker girdles, if you can find and afford them, when installing performance injectors. The 24 valve is subject to this type of damage about three to one over a 12 valve.
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Old 02-22-2007, 10:52 AM   #3 (permalink)
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That all makes sense. But you said that the rockers are not removed for and injector swap, the exhaust rocker arm must come off to get to the back side injector hold down bolt. Did i not understand what you are trying to say?
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Old 02-22-2007, 11:01 AM   #4 (permalink)
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it sounds more possible that the shop swapped the rocker arms around which will though the adjustments off,

i hope responsible shop would check lash before they let the vehicle go.
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Old 02-22-2007, 09:37 PM   #5 (permalink)
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Quote:
Originally Posted by BRIAN DRAKE View Post
That all makes sense. But you said that the rockers are not removed for and injector swap, the exhaust rocker arm must come off to get to the back side injector hold down bolt. Did i not understand what you are trying to say?
You only need to remove the front hold down bolt, the hold down slids into the back hold down bolt. Thanks Steve B.
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