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02-07-2025, 09:54 AM
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#1 |
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Active Member
 
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 138
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New oil pump while the pan is off?
I eventually plant to put a new gasket on the oil pad. Would it be a good idea to change the oil pump while I am in there? Would a higher flow one help the stock 402 any or is it better to no disturb it if it is working.
Is there a better, bigger, pan to put on, a new one would be lighter I am sure. Edit: I guess I would need to take the oil pump off anyways if I were to re-do the rear main while in there
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'72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. Last edited by IT Cowboy; 02-07-2025 at 10:05 AM. |
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02-07-2025, 03:16 PM
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#2 |
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Senior Member
Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 958
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Re: New oil pump while the pan is off?
How many miles are on the engine?
What is your current oil pressure at idle and driving? |
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02-07-2025, 03:51 PM
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#3 | |
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Active Member
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 138
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Re: New oil pump while the pan is off?
Quote:
__________________
'72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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02-07-2025, 11:47 PM
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#4 |
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Senior Member
Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 958
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Re: New oil pump while the pan is off?
If it's not broke don't fix it
 If it were me I would pull the pump cover and inspect for any scoring on the pump body and gears. If it looks good then clean and reinstall the pump cover using red loctite on the bolts. When you pull the rear main cap check the bearing for any wear. Post some pics as we all like those! I would keep the stock pan. |
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02-08-2025, 03:15 PM
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#5 |
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Registered User
Join Date: Jun 2019
Location: Chehalis, WA
Posts: 117
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Re: New oil pump while the pan is off?
Pumps very rarely fail, although pressed-in pickups can and do.
High-volume pumps are a crutch for worn bearings, or in cases like racing engines where some builders use wider-than-standard bearing clearances. I’d leave it alone. |
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02-09-2025, 02:45 PM
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#6 |
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Registered User
Join Date: Feb 2011
Location: Under the Truck Dreaming
Posts: 775
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Re: New oil pump while the pan is off?
The extra volume puts a lot of oil up on top (too much) and it adds to the leaky valve cover gaskets. Also the high volume can be a good thing if you have an oil cooler for towing but for normal around town stuff it's not necessary. If you see some scoring on the top cover you can lap that on a sheet of glass with wet/dry paper.
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72 K20 Custom Camper, D60, 14BFF, full roller 406 TPI w custom built ECU and yes..it has tow hooks...and a 5 speed |
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