Hello everyone. I've been hearing a slight noise from the oil pump drive shaft area, only when the engine is cold. After researching the issue here, I've learned about the failure of the oil pump drive shaft retainer and collar. Unfortunately the collar and retainer are discontinued. I bought Technico's 7M oil pump drive shaft needle bearing retainer upgrade. I know the factory manual tells you to remove the engine from the car, remove the cylinder head from the engine and remove the oil pan from the engine. I know the cylinder head rests on the inner timing case, with seal packing. Has anyone attempted to remove and reseal the inner timing case with the head installed?