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Off Topic Off Topic - General non-Corvette related discussion. |
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06-21-2022, 9:52pm | #1 | ||||||
Chief Electrician
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Truck update
My truck's been in the shop for a couple weeks. It started running like crap and then tapping loudly. Shop quoted $12k to replace the engine saying they suspected a rod knock. Fast forward/skipping details and debates...They pulled the head and found a failed lifter and two bent push rods.
...in the head they worked on. Under the old management and a now fired mechanic, the lifter they replaced last year was done incorrectly. I'll be getting head done, new cam, new lifters, etc on their dime. They owned up to it. I was very pleasantly surprised. |
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06-21-2022, 9:56pm | #2 | ||||||
A Real Barner
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06-22-2022, 5:31am | #3 | ||||||
A Real Barner
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06-22-2022, 5:35am | #4 | ||||||
Vette Barn nOOb
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Was it an independent mechanic or a dealership?
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06-22-2022, 6:17am | #5 | ||||||
Goldilocks
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What kind of truck? Year? Chevy has lifter issues. That’s why I ask.
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06-22-2022, 6:43am | #6 | ||||||
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06-22-2022, 7:06am | #7 | ||||||
Goldilocks
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06-22-2022, 7:38am | #8 | ||||||
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Supposedly the displacement on demand fuel efficiency scheme causing problems. They cut off function to half the cylinders while you're cruising down the road. I spent $100 to bypass that with a gizmo that plugs into the OBD port... If I wanted to drive a 4 cylinder I'd have bought a 4 cylinder. Dumb asses.
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06-22-2022, 7:41am | #9 | ||||||
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06-22-2022, 7:56am | #10 | |||||||
Goldilocks
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Quote:
So far, I’ve got 10k on my truck and alls well. I was told by a service manager at a Chevy dealer if you’re gonna have it, it’ll be before 15,000 miles. |
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06-22-2022, 9:44am | #11 | ||||||
Chief Electrician
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06-22-2022, 9:46am | #12 | ||||||
Chief Electrician
Barn Stall Owner #7734 Bantayan Kids '15
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06-22-2022, 10:26am | #13 | ||||||
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$12K for and engine replacement?? That is insane.
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06-22-2022, 11:39am | #14 | ||||||
Chief Electrician
Barn Stall Owner #7734 Bantayan Kids '15
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06-22-2022, 1:17pm | #15 | |||||||
Goldilocks
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Quote:
GM does have a service bulletin out on this, they're well aware of the problem. Now, how about you fuking' FIX it you assholes. |
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06-22-2022, 1:27pm | #16 | ||||||
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06-22-2022, 1:47pm | #17 | |||||||
Chief Electrician
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Quote:
Valve Lifter Oil Manifold Assembly The valve lifter oil manifold assembly is bolted to the top of the engine block beneath the intake manifold assembly. The oil manifold consists of 4 electrically operated and normally-closed solenoids. Each solenoid directs the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters. The active fuel management oil pressure relief valve, located in the oil pan, regulates engine oil pressure to the lubrication system and the oil manifold. When enabling conditions are met for active fuel management operation, the ECM will ground each solenoid control circuit in firing order sequence, allowing current to flow through the solenoid windings. With the windings energized, the solenoid valves open and direct pressurized engine oil through the valve lifter oil manifold into 8 vertical passages in the engine block lifter valley. The 8 vertical passages, 2 per cylinder, direct pressurized oil to the valve lifter bores of the cylinders to be deactivated. When vehicle operating conditions require a return to V8 mode, the ECM will turn OFF the ground circuit for the solenoids, allowing the solenoid valves to close. When the solenoid valves are closed, remaining oil pressure is exhausted through the bleed passages of the valve lifter oil manifold into the engine block lifter valley. The housing of the oil manifold incorporates several oil bleed passages that continually purge trapped air from the manifold and engine block. To help control contamination within the active fuel management hydraulic system, a small replaceable oil filter is located in the valve lifter oil manifold oil inlet passage. The oil pressure sensor monitors engine oil pressure and provides information to the ECM. Active Fuel Management Valve Lifters When operating in V8 mode, the active fuel management valve lifters function similar to the non-active fuel management valve lifters. The active fuel management oil manifold solenoids are in the closed position, with no pressurized oil directed to the valve lifters. The pushrod travels upward and downward to actuate the rocker arm and valve. The spring loaded locking pins of the lifter are extended outward and mechanically lock the pin housing to the outer body of the valve lifter. When the active fuel management system is commanded ON, the ECM will direct the solenoids of the oil manifold to open and direct pressurized oil to the valve lifters. Oil travels through the valve lifter oil manifold and engine block oil galleries and enters the inlet port of the valve lifter. When operating in V4 mode, pressurized oil forces the locking pins inward. The pushrod remains in a constant position and does not travel upward and downward. The outer body of the lifter moves upward and downward independently from the pin housing. The valve lifter spring retains tension on the valve train components to eliminate valve train noise. When the active fuel management system is commanded OFF, the ECM directs the solenoids of the oil manifold to close, stopping the flow of pressurized oil to the valve lifters. The oil pressure within the lifter will decrease and the locking pins will move outward to mechanically lock the pin housing and outer body. The active fuel management engine block incorporates additional features to support active fuel management system operation. Engine oil pressure is routed to the valve lifter oil manifold assembly from an oil gallery in the rear of the cylinder block. Cylinders 1, 4, 6, and 7 each have 2 vertical, cast-in-block oil passages . The vertical oil passages permit oil flow from the manifold assembly to the valve lifter bores. |
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06-22-2022, 4:07pm | #18 | ||||||
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How much money was spent, screwing up a perfectly good design!
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06-22-2022, 4:45pm | #19 | ||||||
Chief Electrician
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06-22-2022, 6:38pm | #20 | ||||||
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I remember your folks RV trip from years ago
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