GM 2.8, 3.1 & 3.4 Stripped Threads – TIME-SERT 1812CORENovember 10, 2011 12:36 pm Chevrolet, GM Intake, How To Auto Repair, TIME-SERT Kits
© DenLorsTools.com Summary: Suggestions on how to properly repair stripped threads for rocker arm bolts in cylinder heads. Tools for repairing rocker arm bolt holes for gm 2.8, 3.1 and 3.4′s. Affected engines in GM vehicles are 2.8, 3.1 and 3.4 Liter V-6 motors. Aluminum cylinder heads used in Chevrolet, Oldsmobile, Buick and Pontiac’s have a common problem with rocker arms coming loose. Misfire codes and very rough running conditions can indicate a fallen rocker arm.
Here’s the common scenario; After replacing the intake gaskets yourself or having a repair shop do the job, the engine starts running horribly! The check engine light comes on and there’s an OBVIOUS misfire. What’s the most common cause? A fallen rocker. ONE bolt holds each rocker. The bolt threads into the aluminum head. There’s a lot of stress on these threads and that’s why they commonly fail. We have an article that covers using a pushrod remover tool that eliminates the need to run these bolts in and out to begin with, which is the best way to avoid wearing these delicate aluminum threads. The next step is to either replace the cylinder heads or repair the threads. The least expensive repair would be to just repair the threads. The next decision to make is “what repair system to use?” Heli-Coil thread repairs are a popular choice, however any experienced auto technician, if given a choice would go with the TIME SERT brand part number 1812CORE DLT. Need more information? See our article on the difference between Helicoil and Time-Sert before you decide. It’s linked below with the other related pages including the Time Sert thread repair kit.