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Exhaust Manifold Gaskets/Lifter Tick
- Thread starter JPVortex
- Start date
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rockola1971
Full Access Member
Did you put the fan on backwards? Facing the wrong way?
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JPVortex
Full Access Member
Should be on correctly. Theres a side labelled front, that side is facing the front of the truck
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JPVortex
Full Access Member
So folks, did some thinking and came up with this, thoughts? Sorry if formatting is a bit weird, I also posted this to a facebook group.
I did notice that oil is a bit slow to get up to the top end(running with valve covers off)
Now, also, most healthy 5.3s I see have around 40-45psi of oil pressure at idle. Mine only has 28-30psi at warm idle AT the pump. I have a full time mechanical gauge installed at the plug where you'd prime the oil pump, so it reads what the pump is making.
The tick started last October, and I noticed my oil pressure going down slowly overtime along with the tick, until it hit around 20psi at hot idle(used to be 35-40psi). So I did the obvious, and dropped the oil pan and replaced the pickup oring. It did raise the oil pressure to where it sits now(28-30psi at warm idle), but I never recovered my full original oil pressure and the tick still remains.
I did notice, when I installed the new oring, it took very little force to slide it into the oil pump, like almost none at all. Isn't it supposed to be pretty tight to install? I had a blueish green original oring and replaced it with Felpro 72401. I'm now wondering if the oring is not sealing well still and I should drop the pan again to replace the oring again with a different brand oring(probably Mahle) .
Thoughts?
Thanks!
I did notice that oil is a bit slow to get up to the top end(running with valve covers off)
Now, also, most healthy 5.3s I see have around 40-45psi of oil pressure at idle. Mine only has 28-30psi at warm idle AT the pump. I have a full time mechanical gauge installed at the plug where you'd prime the oil pump, so it reads what the pump is making.
The tick started last October, and I noticed my oil pressure going down slowly overtime along with the tick, until it hit around 20psi at hot idle(used to be 35-40psi). So I did the obvious, and dropped the oil pan and replaced the pickup oring. It did raise the oil pressure to where it sits now(28-30psi at warm idle), but I never recovered my full original oil pressure and the tick still remains.
I did notice, when I installed the new oring, it took very little force to slide it into the oil pump, like almost none at all. Isn't it supposed to be pretty tight to install? I had a blueish green original oring and replaced it with Felpro 72401. I'm now wondering if the oring is not sealing well still and I should drop the pan again to replace the oring again with a different brand oring(probably Mahle) .
Thoughts?
Thanks!
OP
OP
JPVortex
Full Access Member
Well well well. Some digging online has been done. Compared diameters of the Felpro oring that I put into my truck, and a Mahle replacement.
ID and OD are as followed:
ID:
Felpro: 19.5mm
Mahle: 20mm
OD:
Felpro: 28.04mm
Mahle: 29mm
So it seems, the Mahle oring seems to be just SLIGHTLY bigger than the Felpro counterpart that's in my truck... I bet that mm difference is the difference between a tight seal in the oil pump and a loosey goosey seal in the Felpro. I have to wonder if the oring is semi-sealing but is aerating the oil coming up to the top end, and decreasing oil pressure to lower than what it was before the original oring went bad. Have to wonder if the oil is aerating and that could be causing the lifter tick, or damaged the lifter/roller and that is causing a tick...
Think I may be tearing the oil pan off again and redoing this job with the Mahle oring instead of the Felpro that's in it.
ID and OD are as followed:
ID:
Felpro: 19.5mm
Mahle: 20mm
OD:
Felpro: 28.04mm
Mahle: 29mm
So it seems, the Mahle oring seems to be just SLIGHTLY bigger than the Felpro counterpart that's in my truck... I bet that mm difference is the difference between a tight seal in the oil pump and a loosey goosey seal in the Felpro. I have to wonder if the oring is semi-sealing but is aerating the oil coming up to the top end, and decreasing oil pressure to lower than what it was before the original oring went bad. Have to wonder if the oil is aerating and that could be causing the lifter tick, or damaged the lifter/roller and that is causing a tick...
Think I may be tearing the oil pan off again and redoing this job with the Mahle oring instead of the Felpro that's in it.
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