Went to leave work yesterday just sitting there with my foot on the brake it started to miss. Drove it home, pulled drivers side valve cover and found a broken rocker arm. I have all the pieces and the push rod is not bent. I didn't have time to look into the cause. I don't recall over reving the engine at all. Its got over 2k since the rebuild. I had new valves and 910's installed. I had the machine shop do it when they cut the seats.

 

Any thoughts?

 

Could this be caused by not having it torqued-down to proper specs? As in, it got more and more loose over time and eventually the "play" caused it to break? That's my only guess.

 

Mount was still tight.

 

Looks like its all there.

 

Seen that a few times, but its always just been kinda random. Ive always just replaced the rocker and never had a repeat failure.

 

Well that would be good if it was random.

 

I would make sure you have all the pieces and replace it, make sure its torqued within specs and then after 1000, 2000 miles I would pull the VC and ck the torque again just to be sure everthing is still good.

 

Does anyone know which valve is located on the right side of the injector? Since you buy the new rocker preassembled. Thanks.

 

Is my thought correct in that the intake and exhaust rockers arm asemblies are the same parts just assembled the opposite way? I need to order one and wanted to order the correct one.
Thanks

 

Intake is to the right of the injector.

 

That is what I thought due to it smoking.
Thanks.

 

Wonder if the heavier springs have anything to do with it? Maybe it was already cracked and the extra tension from the springs shortened the life. Is this your first one to break? I thought someone else just went through this.

 

Bulla, yes this is my first rocker arm breaking. I have read of many others running 910's with no issues. I'm hoping it is a fluke thing.

 

Installed new rocker arm assembly. Turned engine over with socket to make sure everything moved ok. Started engine with v/c off. Just to check. Re-torqued rockers and injectors. Have to see how everything goes next time I drive it.