GM 10044683 Pan Assembly, Oil

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To get rid of and introduce various engines, e.g. the 350 Buick Engines, 231 and 252 Buick Engines, 305 and 350 Chevrolet-Built Engines, 265 and 301 Pontiac-Built Engines, a person should do as follows: First remove the battery ground cable, then remove any necessary items like fan shrouds, air cleaners and exhaust pipes, after which lift up the vehicle, drain the oil off it, detach engine mounts, support the engine with appropriate means for instance jacks or chains from an overhead crane if need be and at last but one stage in the process take off oil pan by unscrewing bolts after that clean both flanges and put new gasket or gasket covered in sealant. Finally tighten them down to specification using torque wrenches.

If the engine has been pulled out from the car, start by lifting the front part of the car and putting some jack stands. Pull the crankcase ventilation tube out, and drain the oil from the crankcase, and then unbolt the front engine mount from the cradle and the exhaust crossover pipe. Remove the wires, which are connected to the starter, then, take off the flywheel housing inspection cover and the upper generator bracket. Get an engine hoist and place it over the engine lifting eyes making sure that the chain is wrapped rightly in its place. Take off the lower generator bracket and engine support bracket and raise the engine at the upper end on the sides just enough to allow the removal of the oil pan. Disconnect the oil pan drain by unscrewing the bolts which hold it in place, and if necessary to get it off, use a rubber mallet. It is also recommended to remove any deposits that may be present on the sealing surfaces in order to install the oil pan gasket: this component includes four pieces that have to be correctly positioned. Place the rear gasket in the rear main bearing cap then apply sealant on the front gasket for the timing gear cover and on the side gaskets for the oil pan use grease. Cut the ends of the front gasket to get well with the side gasket and gum the split lines. Align the oil pan over the block and fit it to the block, making sure that the gasket is not shifted in the process; fit the rear and side mounting bolts in place and tighten them before doing the same for the front bolts at the timing cover. Tighten all bolts to standard and finally perform the process in reverse to the removal process.

In order to efficient remove the oil pan you must first; disconnect the cable from the negative terminal on the battery, then find a suitable spot on the vehicle, raise it about sixteen inches and put it on jackstands. Safely drain the engine oil, and if the vehicle is fitted with a manual transmission, then remove the clutch housing; if however the car is fitted with an automatic transmission then remove the flywheel cover. Before that, I turned over the starter and started unbolting the oil pan and identified which bolts are thicker than the others. Take much care while lifting the oil pan and do not try to pry between the block and the pan in order to avoid scratching off the sealing surfaces. For installation, make certain that the mating surfaces of the pan sealing flange, block and the timing cover are clean from oil and all the threaded holes of the rear main bearing cap are clean as well. If reinstalling the original pan, be sure all sealant has been removed from the sealing flange. Spread a 1/8 inch of ATV-type sealant on the oil pan sealing flange, properly align the pan, and fasten the bolts just tight enough to be held by your fingers. Loosen all bolts and then again, tighten them to the required torque value and the order of tightening should be done from the end bolts. Replace the starter, then the clutch cover or the flywheel shield, lower the vehicle, fill the engine with oil and illuminate the negative battery terminal. Last of all engage the starter, turn on and off the engine and observe if there is oil leakage at the oil pan.

If the engine has been pulled out from the car, start by lifting the front part of the car and putting some jack stands. Pull the crankcase ventilation tube out, and drain the oil from the crankcase, and then unbolt the front engine mount from the cradle and the exhaust crossover pipe. Remove the wires, which are connected to the starter, then, take off the flywheel housing inspection cover and the upper generator bracket. Get an engine hoist and place it over the engine lifting eyes making sure that the chain is wrapped rightly in its place. Take off the lower generator bracket and engine support bracket and raise the engine at the upper end on the sides just enough to allow the removal of the oil pan. Disconnect the oil pan drain by unscrewing the bolts which hold it in place, and if necessary to get it off, use a rubber mallet. It is also recommended to remove any deposits that may be present on the sealing surfaces in order to install the oil pan gasket: this component includes four pieces that have to be correctly positioned. Place the rear gasket in the rear main bearing cap then apply sealant on the front gasket for the timing gear cover and on the side gaskets for the oil pan use grease. Cut the ends of the front gasket to get well with the side gasket and gum the split lines. Align the oil pan over the block and fit it to the block, making sure that the gasket is not shifted in the process; fit the rear and side mounting bolts in place and tighten them before doing the same for the front bolts at the timing cover. Tighten all bolts to standard and finally perform the process in reverse to the removal process.

A spacer can be made from a block of wood, measuring the height of the engine mount studs and choosing a solid block approximately 3/4-in thicker than this measurement, with drilled holes to fit over the studs.

The front gasket should be placed on the timing gear cover.

Reinstall the bell housing dust cover and the starter, then reconnect the exhaust pipe to the manifold and hanger brackets.

The remaining installation steps are the reverse of removal. Remember to refill the engine with oil before starting the engine and checking for leaks around the oil pan.

Raise the engine slowly until wood blocks can be placed between the frame front crossmember and the engine block, checking clearances around the engine, particularly with the distributor and cooling fan.

Remove the front exhaust crossover pipe, followed by the flywheel inspection cover and the starter.

Lower the engine onto the mounts and install the throughbolts.

Drain the engine oil into a suitable container.

Clean the mating surfaces of the oil pan and cylinder block, apply a 1/8-inch wide bead of RTV sealant to the oil pan flange, and install the oil pan, tightening the retaining bolts to the specified torque.

Fill the engine with the correct grade of oil, start the engine, and check the pan for leaks.

To prevent damage when the engine is raised.

Remove the through bolts from the motor mounts.