Two days, battling heat and then the rain on Friday.
Replaced the oil pump and pickup tube on the 2008 Chevy Silverado 5.3 V8. My mom went to use it after the head gasket replacement and wham! No oil pressure! Was it that goofy sensor that fails and is on the back of the engine near the firewall? No with the noise I heard. She ran it for mere seconds so it was salvageable.
It’s 4WD so it means pulling a cross member, front driveshaft, front differential, dropping the steering rack and removing a thousand 10mm pan bolts. Then, moved to the timing cover which necessitates pulling the water pump, both belts, tensioners, the radiator fan assembly, and the harmonic balancer. Which does not want to leave.
Finally got the old pump off and took it apart to examine it. I had a new one so my analysis was simply to see what happened. It seemed fine so that was puzzling. I installed the new one, put a new timing cover gasket on, new front seal, mounted the harmonic balancer with some luck and precision impacts with no issue. Not standard procedure to mount it, I know.
Put it all back together despite rain and greasy water getting on me, trying to get into my eyes and mouth. Finally put it together enough to test start to check oil pressure. No coolant yet so it had to be quick.
That two seconds of no oil pressure while it built was scary, but then it leaped up to about 60 psi. Success!
I figure the old oil pump was worn enough that the inner rotor was slipping past the outer rotor lobe and thus no pump action.
Now begins the installation of the diff, pushing the steering rack back and remounting the cross member. Then I’ll vacuum fill the coolant.
Rough couple of days.
Next: my nephew’s Crown Vic has a big oil leak from the oil cooler line. Need to see if I can grab some new line and fix it.