Yet another Yukon with engine tick and low oil pressure

j91z28d1 said:

it's the craziest thing.. it doesn't sound like valve train to me either, but I've never heard anything knock like that when cold and go away. any time I've been around bottom end stuff, like main or rod bearings they all get much worse than hot.. can almost sound OK when still cold on thick oil.


possible it's a stater rubbing the flywheel? or balances that's completely come part? I'm so confused by this truck.. cold, 40psi oil pressure and it knocks, gets warm, drops to 11 psi and gets quiet.

I got nothing.

one of my first engines I build as a kid, I added a windage tray and didn't get a clearanced enough a rod hit it. that's the closest thing I can remember hearing to this.

Click to expand...

j91z28d1 said:

it's the craziest thing.. it doesn't sound like valve train to me either, but I've never heard anything knock like that when cold and go away. any time I've been around bottom end stuff, like main or rod bearings they all get much worse than hot.. can almost sound OK when still cold on thick oil.


possible it's a stater rubbing the flywheel? or balances that's completely come part? I'm so confused by this truck.. cold, 40psi oil pressure and it knocks, gets warm, drops to 11 psi and gets quiet.

I got nothing.

one of my first engines I build as a kid, I added a windage tray and didn't get a clearanced enough a rod hit it. that's the closest thing I can remember hearing to this.

Click to expand...

YukonDK said:

Just checking in. I’ve had the Yukon for a year now. Still my daily driver and nothing has changed tick/knock, oil pressure wise.

I have put 8000 miles on it, since I got it. I hope to get a lot more (knock on wood).

Never got the oil analysis done, prices were steep.

Took it on a road trip out of my country last weekend, 13 hours of driving, driving on the highway oil pressure never dropped below 35 psi.

Had an oil change done two weeks ago, the oil was checked with a magnet for metal shavings, but there was none. Oil looked good.

Without to much inspection, mechanic told me that most likely it’s worn bearings as oil pressure drops when the engine is warm at idle. But at the same they couldn’t tell when the engine was gonna quit.

I have noticed that during summer time the tick/knock goes away quicker than winter time and is less audible when the engine is warm.

Click to expand...

Geotrash said:

Keep driving it. That's what I would do. The oil pressure on these is supposed to drop at idle. Both of mine drop to just above the 1/4 line at hot idle.

Click to expand...