1994 850 Turbo Wagon 159k miles
Was running well with no unusual engine noises, but was leaking oil, so I put it up on jack stands, removed the oil pan, replaced 2 seals between the pan and the block, and 1 seal at the top of the oil pick-up tube. I also installed a new timing belt, new spark plugs, new Mann oil filter, and added 5 quarts of 10/30 Mobil 1. Once it was back on the ground, pulled the fuel pump fuse and cranked it over for about 10 seconds, to get the oil circulating. When I started it, though, it sounded like it took several seconds for the oil pressure to build up, after which it sounded louder than usual; there's now a definite knock that sounds like it's more toward the front of the engine. Assuming that the knock was caused by something that happened during the initial few seconds of low oil pressure, what would it be, most likely?
Thanks for your help!

 

UPDATE: removed oil pan, removed crank bearing caps: no spun bearings. Any suggestions on what else might be checked while the oil pan's off?

NOTE: the reseal from a couple weeks ago seemed to have gone well: I tried prying off the oil pan today, but that didn't work, so I smacked it with a rubber mallet for a bit, and it finally came free; when I had first removed it a couple weeks ago, it practically fell off once the bolts had been removed.

 

Not sure what could be causing the knock. I would put it together and drive it some to see if it clears up.

The car takes about 7 quarts of oil so 5 is not enough.

 

Thanks for your input!

Yeah, I was thinking the same thing. I'll let you know what happens.

 

The engine will still have oil throughout the passages so 7 quarts on a wet engine is too much. Just check your dipstick and add accordingly.
Are you sure its a knock and not a lifter?

 

Lifter is what I am thinking. My mothers s70 will every once in a while tick for a little bit right after an oil change. Her car usually take 5 1/2 quarts. Like Boxpin said, I just fill according to the dipstick.

 

When I heard the knock, my first thought was "Please be a lifter," but it was definitely more than a tick, and it didn't go away after running for 10 minutes, so I'm not hopeful. That being said, I'm not familiar with the sound an oil-starved lifter is capable of making. About to put the oil pan back on: will update.

 

Got everything back together, added 6+ quarts of synthetic 5W/30, pulled the fuel pump fuse, turned it over for about 25 seconds, let the starter rest, turned it over for another 25 seconds, put the fuel pump fuse back in, and started it up. The knock had become more of a loud tick. Drove it several miles: sounded much better, but was still ticking. What I think contributed to the noise was the fact that I hadn't yet installed the timing belt cover: put that back on, and took another test spin: significantly quieter. What a relief! Thank you for your comments, suggestions, and support!

 

Ticks are usually lifters. When they are ticking the manual recommends that you don't rev the motor.

I think 5w-30 is to light, should only be used a temps below 0 degrees F. Where are you located?