Review on 🔧 Genuine GM 12639250 Crankshaft Oil Seal Housing, Rear - Premium Quality for Optimum Engine Performance by Justin Abreu

Original GM part. Fits perfectly and makes repairing a leaking rear engine cover a simple process. GM has some EXPENSIVE special tools to install the front and rear covers and oil pan on an LS engine. I've never used them and had no problems. The original tools still do not work with pre-installed basic sealing. Additionally, the rear main seal can be centered on the rear lip of the crank, as opposed to the front cover where it actually seals the damper pulley and not the crank. The original method installs the back cover without a seal and then attaches the seal, so positioning the cover in front of the seal is critical. Originally the bolts had a 10mm head, the modified bolts had a 13mm head. Installation note: I attached a small RTV bead to the left and right at the joint between the oil pan gasket and the back of the block. I installed the cover with the gasket guard installed as the screws are held by the cover gasket. I worked my way through and tightened all the cap screws, allowing the cap to slide freely on the crank and pushing the seal guard from the inside of the seal. Once the cover bolts were secure to the back of the engine, I installed the two long oil pan bolts and torqued them to 106 in-lbs. The cover bolts are then tightened to 18 ft-lbs. Before doing this I secured them all with a socket and then loosened the long oil pan bolts to attach the cover. Then I tightened the oil pan bolts and then the back cover bolts in a criss-cross pattern.