The Stovebolt.com Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Big Thanks!

Big THANKS to

MONGO
for hosting
the weekend event.



Read all about it.


Stovebolt Site Search
'
Oh Lord, I just gotta find it....

A pdf guide to help you search the Site


Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
9 members (Phak1, Napco Man, 55_2nd_Series, DaveV, Paul_WNC, Cletus1950), 90 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums60
Topics124,660
Posts1,006,225
Members44,993
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Page 2 of 2 1 2
Re: Normal Oil Pressure
stlcardinalsguy #1411120 Mon May 24 2021 01:31 AM
Joined: Sep 2009
Posts: 356
G
'Bolter
I had been meaning to post about this question for a while. I run Rotella 15W40 in my 261, and noticed that at hot low idle ~500 rpms, the oil pressure drops to about 15psi. Give it gas to a fast idle and then start accelerating, and it jumps right back up to 30psi. Good to know that is sufficient oil pressure. These 6's sure do purr at 450-500 rpms.


-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: Normal Oil Pressure
stlcardinalsguy #1411163 Mon May 24 2021 01:18 PM
Joined: Feb 2019
Posts: 2,087
P
AD Addict
Originally Posted by Hotrod Lincoln
It's far more likely that you've got some badly worn bearings that are consuming more oil than the pump is able to provide.
I agree with Jerry. When I bought my ‘52 with a rebuilt 235, my oil pressure dropped to less then 5 lbs at idle when hot. I spent more than a year chasing the issue before I pulled the motor and disassembled. The rebuild turned out to be really shoddy work (bearing clearances were all over the place from too tight to .010” too loose) that required me to have a competent machine shop regrind to everything to the next size bearings.


Phil

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Normal Oil Pressure
stlcardinalsguy #1411179 Mon May 24 2021 03:22 PM
Joined: Dec 2008
Posts: 1,623
P
'Bolter
The Melling M-45 is a direct replacement for all 1955-* 235 & 261.

Re: Normal Oil Pressure
stlcardinalsguy #1411188 Mon May 24 2021 05:12 PM
Joined: Apr 2010
Posts: 309
6
'Bolter

Re: Normal Oil Pressure
truckernix #1411236 Tue May 25 2021 12:24 AM
Joined: Feb 2020
Posts: 51
S
'Bolter
Originally Posted by truckernix
I worried about the low oil pressure in my 216 for years. One day I checked it with another gauge and found out my gauge was off.
Yep

My Dad brought a couple extra gauges over that he had lying around. "Make sure the gauge isn't bad, all that new Chinese stuff is crap." he said. I tell him I already ordered a new pump and will just replace it, can't be the gauge it's brand new. "Won't take but 2 minutes" he says and heads over. Both of his gauges read 32 at idle, and increase into the 40s with RPM increase. Dad smirks, goes about disconnecting his gauge. My new Chinese oil pressure gauge is junk. Ordered the Melling pump this morning so at least I'll have it on hand if the existing pump goes sometime or if I have to get in there for something else.


Mason

1947 Chevy 3100
-57 Chevy 235
-93 S10 T5 Transmission
-97 Blazer 3.42 Rear End
Re: Normal Oil Pressure
stlcardinalsguy #1411238 Tue May 25 2021 12:39 AM
Joined: Feb 2019
Posts: 2,087
P
AD Addict
Your Dad is a very smart man! A real good example of KISS!

Glad to hear you solved your issue!

Last edited by Phak1; Tue May 25 2021 12:39 AM.

Phil

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Normal Oil Pressure
stlcardinalsguy #1411260 Tue May 25 2021 03:46 AM
Joined: Feb 2004
Posts: 23,004
H
'Bolter
Oil pressured gauges work just as well on air pressure as they do with oil. A compressor with a pressure regulator on it makes it easy to check the accuracy of a gauge. That's how I test a compression gauge before using it on an engine.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Page 2 of 2 1 2

Moderated by  Woogeroo 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4