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you may try changing the sender first before the time to change the oil pump. level of skill to change the oil pump is not high. time wise it requires either pulling the motor or raising the engine up in the cradle and droppin the oil pan . to answer your question directlly bout 9 to 12 hours hard
They may be right. Too much clearance on the bearings is where you lose oil pressure, or so I've heard. If you bought it used, someone may have once run old, dirty oil in it too long, or let it run low. You could drop the oil pan and check the bearings or replace them.
Hey Phil, I own a 98 silverado and just had to drop the pan this weekend. The first thing you will need to do is diconnect the battery, un-bolt the starter, ****** strut arms, fly wheel cover and un-bolt all the oil pan bolts. (I also had to remove the oil filter and adapter cause there was one oil pan bolt I could not get to.) The next step is to pull both motor mount bolts and raise the motor up with a cherry picker. I slipped two 2x4 blocks under the motor to rest on the motor mounts.
I hope this was helpful and you were able to get your oil pan off. I know its alot to do as the MFG was not thinking when they built them or somthing.
Sounds like your oil pump is "getting tired". If you plan on keeping it for any length of time, you're probably going to have to replace oil pump. To replace you'll need to drain oil, drop oil pan and you'll find oil pump and pick up tube and strainer bolted to lower part of engine. Unbolt, slide out holding oil pump shaft in engine, slide new pump/strainer and pickup in place, bolt in place, reinstall pan and refill with oil.
you will have to remove the starter flywheel inspectin cover and move the trans. cooling lines out of the way , undo the motormounts and raise the engine to allow clearance, remove the bolts for the oil pan and if necessare you may have to remove the pickup tube and oil pump to get the pan out
The oil pump is in the the oil pan so you will need a new oil pan gasket and some form a gasket as well to put the pan back on, because you will have to take it off, you will see the oil pump a soon as you take the pan off, it will have a tube connecting to the pick up screen and to the block, remove bolts from the block and remove oil pump. be prepared the primming rod will probably come out too. itll need to go back of course, make sure seated in correctly because the primming rod runs off the cam. make sure the surface area for the oil pump gasket is clean before reinstalling new oil pump same goes for oil pan. after everything back together refill oil. It is best to test the oil pump before starting for your engine. the best way to do this is to remove the distrubuter if it has one if it has electronic ignition it will have a cap where the distributer went remove that and you will see the top end of the primming rod, fit appropriate socket on the primming rod and use a battery gun to spin, look inside oil fill cap and make sure you see oil flow or oil pressure on your gage if equiped, CAREFULL!!!!!! make sure the socket on battery gun has no way of falling off, or you will have to remove oil pan again to retrieve it.
Another way to prime pump is to disable igniton main power like remove the coil wire, or main power wire for electronic igniton so you can turn the motor over with out it starting, once again turn it over until you know you have oil pressure with the gage or through oil fill cap. put ignition back together start the car and once again confirm oil pressure. If every thing looks good your done Good luck
If oil pressure was fine before you changed the gasket, it's likely that some debris was loosened up (probably under the pan baffle) and got onto the oil pump pickup, restricting flow. The only other cause of low pressure would be worn engine bearings, which would not happen just by changing oil pan, unless you messed with either bearings or pump while pan was down. Remove the pan and carefully inspect the pump pickup for debris!!! DO NOT DRIVE VEHICLE 'TILL YOU HAVE CORRECTED THIS OR YOU WILL DAMAGE BEARINGS!!!