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02-09-2023, 06:48 PM | #1 |
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59 block oil relief plunger install
I am using the 8ba helical gear oil pump with the 50 psi relief spring and the original block relief plunger has a flat on it that appears to allow "leakage" into the cam gear compartment. I also have a new plunger and spring and this plunger does not have the flat on it . Which should I use? I have a picture of the original plunger.
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02-09-2023, 07:45 PM | #2 | |
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Re: 59 block oil relief plunger install
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02-09-2023, 07:52 PM | #3 | |
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Re: 59 block oil relief plunger install
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02-09-2023, 08:52 PM | #4 |
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Re: 59 block oil relief plunger install
Thanks, Kube for the reply. Is there any reason to increase the spring on the block relief? That would make the system more like the 8ba design.
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02-10-2023, 08:59 AM | #5 |
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Re: 59 block oil relief plunger install
If you increase the spring pressure, you will increase the oil pressure. I am not certain why increasing the oil pressure is necessary.
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02-10-2023, 10:36 AM | #6 |
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Re: 59 block oil relief plunger install
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02-10-2023, 11:08 AM | #7 | |
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Re: 59 block oil relief plunger install
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If so, you will want to increase the spring pressure on the valve beneath the valve chamber cover. Use the ball with the flat but increase the spring pressure.
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02-10-2023, 05:51 PM | #8 | |
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Re: 59 block oil relief plunger install
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Operating the oil pressure system at the higher (80) pressure on a pre 1941 block (using the crankshaft slingers at the rear main instead of the rope seal design) may result in some oil leakage out past the rear main bearing. I’d love to hear from any builders out there who did a non-rope block with the 80 psi system and can offer any first hand experience with the issue.
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02-10-2023, 05:55 PM | #9 | |
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Re: 59 block oil relief plunger install
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02-10-2023, 08:06 PM | #10 |
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Re: 59 block oil relief plunger install
One thing I was pondering (for some strange reason) is that the pressure relief in the pump circulates the oil back into the pump (I believe), which is a great way to heat up the oil.
Now that I'm pondering this, I think I'd rather have the oil go back to the sump (via the front pressure relief spring/plunger) and give it a chance to cool a bit more - and not circulate in the pump. Just out here in the frozen West - pondering dumb crap like this! LOL |
02-10-2023, 08:43 PM | #11 |
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Re: 59 block oil relief plunger install
Why not use the 50# pump that comes with the engine and works with the pressure guage in the dash.
Bruce
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02-11-2023, 06:49 AM | #12 |
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Re: 59 block oil relief plunger install
[QUOTE=cmbrucew;2203593]Why not use the 50# pump that comes with the engine and works with the pressure guage in the dash.
That too!
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02-11-2023, 08:08 AM | #13 | |
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Re: 59 block oil relief plunger install
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My memory is the post-war 59 motor used 80 lb pumps, just long body versions without internal pressure relief valves. edit, looked in the Green Book for clarification and came back with both verification of 80 lb pressure post war and more questions.
My question: is the 59A 6600-A2 pump a long body pump or an 8BA style pump with internal bypass? Last edited by 38 coupe; 02-11-2023 at 08:42 AM. |
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02-12-2023, 10:50 PM | #14 | |
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Re: 59 block oil relief plunger install
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This is the pump that came with the engine. The engine was rebuilt in the 60s and installed in a car, but was never fired. I took it apart to clean and inspect it. The oil was like cosmoline. |
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02-12-2023, 10:55 PM | #15 | |
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Re: 59 block oil relief plunger install
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That's what I was thinking, and I researched the green book, but couldn't verify if this pump was 50# or 80#. It sounded like the 6600 A1 or A2 were 50# but could be 80# by changing the spring. |
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02-12-2023, 11:05 PM | #16 | |
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Re: 59 block oil relief plunger install
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My worry was/is if the block relief lifts, does it cause a momentary loss/reduction in oil supply to the front cam bearing and thus the front main bearing. |
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02-12-2023, 11:24 PM | #17 | |
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Re: 59 block oil relief plunger install
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On page 279 of Green book it shows 59A6600 A1 with the same relief spring in block relief as it does for the 59A-6600-A2 pump only the spring p/n is 8BA 6654. This is why I think the helical gear pump also has a 50# relief spring. |
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02-12-2023, 11:33 PM | #18 |
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Re: 59 block oil relief plunger install
I seriously want to thank everyone for their replies . I think Kube's advice is what i'm going to do. I plan on cranking the engine over with the plugs out before I install it, so I'll know then if I have to pull the pan and change the pump spring. Thanks again
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02-13-2023, 08:56 AM | #19 |
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Re: 59 block oil relief plunger install
If that was an issue, there would be a bunch of burnt front cam/main bearings in these engines - from the mid 30's all the way to 1948 . . . have never seen an issue myself.
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02-13-2023, 05:26 PM | #20 |
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Re: 59 block oil relief plunger install
If the plunger in the oil relief valve lifts, the cam gear chamber area still gets oil. It gets it all the time. The flat ensures a supply of oil even when the valve is closed.
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