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08-03-2021, 09:52 PM | #1 |
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Join Date: Jul 2021
Location: Minnesota
Posts: 31
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Is this hole behind my oil pump gear normal?
So, I’m looking at my block trying to understand and plan for the 95% mod and I noticed an interesting hole behind the oil pump drive gear. From what I can see, it just dumps straight back into the crankcase. I did some googling to try to see if other blocks had this hole and the one picture I saw showed one in that spot, but it was much different, like a drilled hole instead of the hole in my block which looks like it’s a chunk missing. If it matters, this is a 49-53 8CM. Thanks in advance.
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08-04-2021, 12:34 AM | #2 | |
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Join Date: May 2010
Location: East Hartford, Ct
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Re: Is this hole behind my oil pump gear normal?
Quote:
Gives a place for residual oil in the valve chamber to drain back to the pan while providing a little lubrication to the gears.
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08-04-2021, 12:37 AM | #3 |
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Join Date: Jul 2021
Location: Minnesota
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Re: Is this hole behind my oil pump gear normal?
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08-04-2021, 12:44 AM | #4 |
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Re: Is this hole behind my oil pump gear normal?
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08-04-2021, 12:47 AM | #5 |
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Location: Minnesota
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Re: Is this hole behind my oil pump gear normal?
Ah, I think he edited to add that since I replied, or I am blind. Thanks.
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08-04-2021, 01:56 AM | #6 |
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Re: Is this hole behind my oil pump gear normal?
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This will be an "EDIT Test". DD "THIS is edited"! Note "EDIT and time mark below in italics! He DID NOT Edit! . Last edited by V8COOPMAN; 08-04-2021 at 02:06 AM. |
08-04-2021, 04:00 PM | #7 |
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Join Date: Oct 2019
Location: Carthage , Tennessee
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Re: Is this hole behind my oil pump gear normal?
I just went downstairs and checked my block .
It’s a 49 Merc,,,,,and has the exact same shaped hole there as yours . Yours is perfectly normal,,,,don’t worry . I took some pics but it is bolted to an engine stand,,,so the pics are not perfect . And it’s a bear to post pics here . Tommy Last edited by Desoto291Hemi; 08-04-2021 at 04:05 PM. |
08-04-2021, 04:12 PM | #8 |
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Join Date: Jul 2021
Location: Minnesota
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Re: Is this hole behind my oil pump gear normal?
Thanks for checking. Appreciate it.
As for my confusion on the possible edit, I noticed it didn’t say it was edited, but I quoted that reply, and looking at my quote it didn’t have the second part, I also don’t remember seeing it before I replied the first time so that’s why I thought it was edited in. Maybe a glitch on my end cause I’ve got some wacky middle-of-nowhere internet. Doesn’t matter in the slightest though, I got the info I was after and I am thankful. |
08-05-2021, 04:34 AM | #9 |
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Join Date: May 2010
Location: Fitzgerald, Georgia
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Re: Is this hole behind my oil pump gear normal?
That "hole" prevents pressure potential in the gear case which could lead to serious leakage at the gasket face. If you pressure feed your oiling system and observe the outflow into the lifter galley you will see what that hole is all about.
The fit of the oil pump in the block is not perfect. Some worse than others. Also the pressurized oil escapes through the upper pump bushing of which much goes into the gear case. |
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