Broken rocker arm! - Dodge Cummins Diesel Forum
911 Urgent Situations Emergency Forum , Need Help Fast ? Post Here ! Urgent Topics Only...NO ADVERTISING

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 02-20-2007, 12:24 PM Thread Starter
Cummins Enthusiast
 
BRIAN DRAKE's Avatar
 
Join Date: Feb 2007
Location: COWTOWN TEXAS
Posts: 227
Thanks: 0
Thanked 3 Times in 3 Posts
iTrader Score: 0 reviews
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???????

BRIAN DRAKE is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 02-21-2007, 05:26 PM
Tech Specialist
 
Join Date: May 2006
Posts: 187
Thanks: 0
Thanked 3 Times in 2 Posts
iTrader Score: 0 reviews
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.
Oregonpharmer is offline  
post #3 of 5 (permalink) Old 02-22-2007, 10:52 AM Thread Starter
Cummins Enthusiast
 
BRIAN DRAKE's Avatar
 
Join Date: Feb 2007
Location: COWTOWN TEXAS
Posts: 227
Thanks: 0
Thanked 3 Times in 3 Posts
iTrader Score: 0 reviews
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?
BRIAN DRAKE is offline  
post #4 of 5 (permalink) Old 02-22-2007, 11:01 AM
Cummins Enthusiast
 
IsbEinside's Avatar
 
Join Date: Oct 2006
Location: SAN JOSE, CA
Posts: 244
Thanks: 2
Thanked 10 Times in 10 Posts
iTrader Score: 0 reviews
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.

06', Left Coast Hooker Tuned by Silver Bullet Tuning
IsbEinside is offline  
post #5 of 5 (permalink) Old 02-22-2007, 09:37 PM
Cummins Fanatic
 
ctd8999's Avatar
 
Join Date: May 2006
Posts: 143
Thanks: 0
Thanked 4 Times in 4 Posts
iTrader Score: 0 reviews
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.

99 QC SB 4X4 GOEREND Trans/Converter, VP-44, 759/1350, 92 W250 Auto, 4" exhaust, 128K mi. Pretty much stock. Best ET 1/8 mi 7.19 @ 96.30. Best ET 1/4 mi 11.27 @ 119.78.
ctd8999 is offline  
Sponsored Links
Advertisement
 
Closed Thread
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome