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A neighbor has a 2008 Infiniti G37, over-revved it and the oil pump impeller shattered. Apparently this is not uncommon with these 3.5L mills. An outfit (Z1 Motorsports) has an interesting explanation for the failure, offering a set of billet cut gears to replace the brittle sintered steel OEM set using the cheaper manufacturing process.
The complexity of this engine is impressive, the chore of replacing that pump, not so much. Have to drop the cast aluminum intermediate oil pan to get the pump body off the crankshaft. Doing this with a lift would come down to lifting the body off the engine/subframe and putting the engine on a stand. In this case, another neighbor and self spent a couple hours wallowin' around on our backs under the car on jackstands, trying to find and undo all the fasteners holding that casting in place! All for the lack of half-an-inch of clearance at the front of the pan to pull the pump straight off for R&R. Somewhere in Japan an engine designer's ears should be aflame...
This car has less than 90K miles on it, a missed shift caused the mayhem. Pieces of the gears and pump housing in the lower oil pan kinda gave indication of catastrophic failure. A supposed experienced Nissan tech began the job thinking the issue was in the top-end, failed lifter or the like, but found the evidence of oil pump failure after he'd opened the top-end and found nothing amiss. Since then he's become MIA, leaving the half disassembled engine and my good neighbor high and dry. Yesterday afternoon, the other tech neighbor decided he'd step in and help, I volunteered to join in. Been observing this project from the beginning, not being familiar with the engine I stood back and watched. It has now become a hands-on learning experience. Kinda concerned about the VVT reassembly, will need to do some in-depth research to make certain the crank/cams relationship is correct and the absent mechanic hasn't moved things.
Onward through the fog! :wink:
The complexity of this engine is impressive, the chore of replacing that pump, not so much. Have to drop the cast aluminum intermediate oil pan to get the pump body off the crankshaft. Doing this with a lift would come down to lifting the body off the engine/subframe and putting the engine on a stand. In this case, another neighbor and self spent a couple hours wallowin' around on our backs under the car on jackstands, trying to find and undo all the fasteners holding that casting in place! All for the lack of half-an-inch of clearance at the front of the pan to pull the pump straight off for R&R. Somewhere in Japan an engine designer's ears should be aflame...
This car has less than 90K miles on it, a missed shift caused the mayhem. Pieces of the gears and pump housing in the lower oil pan kinda gave indication of catastrophic failure. A supposed experienced Nissan tech began the job thinking the issue was in the top-end, failed lifter or the like, but found the evidence of oil pump failure after he'd opened the top-end and found nothing amiss. Since then he's become MIA, leaving the half disassembled engine and my good neighbor high and dry. Yesterday afternoon, the other tech neighbor decided he'd step in and help, I volunteered to join in. Been observing this project from the beginning, not being familiar with the engine I stood back and watched. It has now become a hands-on learning experience. Kinda concerned about the VVT reassembly, will need to do some in-depth research to make certain the crank/cams relationship is correct and the absent mechanic hasn't moved things.
Onward through the fog! :wink: