slow oil pump

[3.8lcoty]

with the engine in my car it runs great but on a cold start the oil pump will take a second to make pressure and I can hear the lifters cycle over.

its not a tick like a bad lifter it is just taking a second for the oil pump but after that it will not do it anymore threw the day and it holds great oil pressure.

do you guys think it could need a new oil pump?

[fbodyrs96]

Re: slow oil pump

3.8 uses a oil pump gear that turns with the crank, the gear could be worn out.

[3.8lcoty]

Re: slow oil pump

Yeah I knew it used the gear type but I hope it isn't worn out, how long does it take to change one out

[LETZRIDE]

Re: slow oil pump

not long, you just need to pull the front cover, so the water pump, crank pulley, etc needs to come off.

It's a couple of bolts, and 3 underneath going through the oil pan.

You'll likely need to change your oil after since you will probably get coolant mixing with the oil when you pull it off.

[ssms5411]

Re: slow oil pump

I wouldn't trust the stock gauge, I would use a mechanical gauge to view it. Then I would go from there. Is it at zero when you start it and then a second or two goes to what PSI on the stock gauge?

[3.8lcoty]

Re: slow oil pump

okay I just started it after a couple hours of being off and what the oil psi does is take half a second to get to rise to 30psi then it rises up to 90 psi within half a second.

but then I noticed the oddest thing that when I turned off the engine that I never noticed the oil psi doesn't go straight to 0 it slowly goes down to 30 then takes like 3 seconds to get to 0

[3.8lcoty]

Re: slow oil pump

cold start, sorry for quality.
http://tinypic.com/player.php?v=b61o...8#.UyuNAYLD_IU

psi going down
http://tinypic.com/player.php?v=5kg5...8#.UyuNZoLD_IU

[techsan23]

Re: slow oil pump

It's not a bad idea to use an oil filter with an anti-drain back valve since the oil filter is positioned on its side on the L36. Most oil filters these days probably have it.