04 Suburban oil pan, whew

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
190
Reaction score
308
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
She's got alot of miles...
I put 5.5 oz of seafoam in oil to clean up, and ran for 100 miles. I had a lifter making noise and it bandaided that. No noise immediately. Replacing oil pump o-ring and gasket. Oil pressure been low, but not dangerous, well sure didn't help (lifters).
 

Attachments

  • 20240313_184953.jpg
    20240313_184953.jpg
    285.8 KB · Views: 37
  • 20240308_211020.jpg
    20240308_211020.jpg
    71.4 KB · Views: 39

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
190
Reaction score
308
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Well, no. Upon start she gets that 38 to 40 PSI but once warmed up to temperature I'm back down to 20 psi at idle so she's just worn out unless I want to mess with oil pump. Opinions?
 

PrairieDrifter

Full Access Member
Joined
Dec 28, 2014
Posts
3,535
Reaction score
4,789
Location
North Dakota
First Name
Mason
Truck Year
84,79,77,70,48
Truck Model
Suburban k10, bonanza k10, c30 C&C, c10, gmc 1/2ton
Engine Size
350, 350, 350, 350, 350
Did you check the pickup tube o-ring? There's also a kit that adds another bolt and flange. I'm not well versed in ls's that's just what I've seen. What's the mileage?
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
190
Reaction score
308
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Yes, what I did was replace the pickup o-ring after seafoam clean up.
That was my bandaide.
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
190
Reaction score
308
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Is 20 at hot idle bad? Maybe try a thicker viscosity of oil?
Well, it's not good. Have some lifter noise when start up, briefly.
Thought about thicker viscosity, but if it's harder to get into hydraulic lifters then that's not really helping make sure top end is lubricated.
Just worry about lifter collapsing or bending, throwing a rob.
Silly really, she's got 332600+ miles. Worn out. An amazing engine.
 

PrairieDrifter

Full Access Member
Joined
Dec 28, 2014
Posts
3,535
Reaction score
4,789
Location
North Dakota
First Name
Mason
Truck Year
84,79,77,70,48
Truck Model
Suburban k10, bonanza k10, c30 C&C, c10, gmc 1/2ton
Engine Size
350, 350, 350, 350, 350
Yeah you're chasing ghosts really. It is what it is at this point.
 

TotalyHucked

Full Access Member
Joined
Feb 24, 2020
Posts
3,031
Reaction score
9,722
Location
Auburn, Georgia
First Name
Zach
Truck Year
1985
Truck Model
Sierra 1500
Engine Size
5.3
Man I wouldn't even worry about it, keep trucking. If the compression still checks good and isn't making alot of noise on start up (some lifter noise or piston slap, I would call completely normal and I've had that on several of those NBS trucks with half that mileage), 20psi hot is fine. That motor is far from worn out.
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
190
Reaction score
308
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Man I wouldn't even worry about it, keep trucking. If the compression still checks good and isn't making alot of noise on start up (some lifter noise or piston slap, I would call completely normal and I've had that on several of those NBS trucks with half that mileage), 20psi hot is fine. That motor is far from worn out.
 

Originalthor

Full Access Member
Joined
Aug 22, 2021
Posts
1,056
Reaction score
3,561
Location
Saskatoon Saskatchewan
First Name
Scott
Truck Year
1989
Truck Model
Suburban
Engine Size
5.7
I got a buddy with a 5.3 with bad lifter tick. It likes to puff a pile of blue smoke too on start up random times. Been like that for years. Lol. We have lost all bets on when its gonna die cause it keeps going.
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
190
Reaction score
308
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Just an update for those curious. Burb hasn't growled at start-up for awhile. I think after that seafoam clean-up, and been using Rislone since oil change has slowly helped lifters. Just fyi. Oil pressure still a concern to me, but it is what it is. Running pretty smooth engine wise. About 2k-2500k past oil change no lifter noise.
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,608
Reaction score
6,090
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
Holy oil sludge batman! Might not hurt to replace the oil pressure sensor, don't know if your era has the screens on them or not. I would imagine if it did it would be clogged up from that sludge!
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,608
Reaction score
6,090
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
This is a good read here, but like I said, this is for 07-14. Not sure about your gen. @Old77 ?


 

Latest posts

Forum statistics

Threads
42,669
Posts
920,281
Members
34,202
Latest member
Diggs816
Top