Re: 359 Noisy Lifters
Posted by HH56 On 2023/7/3 12:10:44
I cannot see the detail but there looks to be something else at the upper port. Is there anything between the pigtail tube end and block besides a straight 1/8 NPT to 1/4" inverted flare fitting? That port is the oil supply to the lifter gallery and should have the pressures Packard mentioned in one of the bulletins.
As Packard found out with the first implementation of hydraulic lifters and their original inline filter plumbing design, if anything is restricting flow in either pressure or volume to the lifters they can become noisy. The pigtail tube was then retrofitted to ensure a high pressure full volume supply to the lifters. Oil thru the pigtail comes via a port fed directly from the oil pump.
Attach file:
226290_64a2fd7f7f0f4.jpg (157.02 KB)
As Packard found out with the first implementation of hydraulic lifters and their original inline filter plumbing design, if anything is restricting flow in either pressure or volume to the lifters they can become noisy. The pigtail tube was then retrofitted to ensure a high pressure full volume supply to the lifters. Oil thru the pigtail comes via a port fed directly from the oil pump.
Attach file:
226290_64a2fd7f7f0f4.jpg (157.02 KB)
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