GM 91176160 Pump,Oil

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Take out the timing belt, tensioner, crankshaft sprocket and belt guide. Pull the oil pan off and remove the oil pickup tube. Remove the alternator bracket. Undo dipstick tube bolts and take it out of engine front case. Take off front cover to block bolts and separate front cover from engine carefully. Disconnect cover from rear of case and remove inner/outer oil pump gears. Crankshaft oil seal must be removed from front case. Pressurizing valve retainer with plunger spring should be taken out too. Thoroughly clean all parts removing any trace of old gasket material on sealing surfaces .Visually examine these parts for wear ,cracks or other damage.Comparing parts as necessary.Installation of the outer and inner gears of the oil pump is followed by measuring their clearances.Comparisons between clearances and specifications are made.Measurement is done also on free height relief valve spring.Replacement should be made in areas where necessary.The pump cavity is then filled with petroleum jelly before installation of its cover.Its new crankshaft's front oil seal will then be replaced.Pressure relief valve components are installed.Finally,positioning the front cover using a new gasket.Bolts are put back in their original locations.On reversal order reinstall remaining parts.Add oil, start the engine, and Remember to check oil pressure and leaks.

The pump is disassembled, all parts are cleaned thoroughly, and old gasket material is removed from the sealing surfaces. Parts are visually inspected for wear, cracks, and damage, and replaced as necessary.