Catastrophic oil pressure loss - SBC - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-24-2008, 06:16 PM
Registered User
 
Join Date: Feb 2008
Location: Maryland
Posts: 20
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Catastrophic oil pressure loss - SBC

I had the Cutlass out yesterday for a quick spin. At startup I saw 60+ psi on the oil pressure gauge. After a few miles I heard a terrible knock, saw the temp gauge climbing, about 10 psi on the oil pressure gauge. I tried to nurse it home the final mile, but the engine puked and died. I hoofed it home and towed it back with the truck. Once I got it home I spun the oil pump with the priming tool and saw 60+ psi again. The engine had cooled by this time. I put it back together and started it enough to move it back into the garage. So, it does still run.

I know I'm looking at a complete teardown and rebuild here. But what kind of things should I be looking for? What would cause a loss of pressure as the oil warms up? What tools should I be getting to complete this? I've got the basic hand tools and know I will need a few more like a ring compressor, etc.

I'm keeping a positive outlook on this and figuring this will be a good learning experience for me.

thanks

stu...

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-24-2008, 06:41 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,764
Wiki Edits: 0

Thanks: 4
Thanked 427 Times in 366 Posts
Quote:
Originally Posted by CuttyGMachine
I had the Cutlass out yesterday for a quick spin. At startup I saw 60+ psi on the oil pressure gauge. After a few miles I heard a terrible knock, saw the temp gauge climbing, about 10 psi on the oil pressure gauge. I tried to nurse it home the final mile, but the engine puked and died. I hoofed it home and towed it back with the truck. Once I got it home I spun the oil pump with the priming tool and saw 60+ psi again. The engine had cooled by this time. I put it back together and started it enough to move it back into the garage. So, it does still run.

I know I'm looking at a complete teardown and rebuild here. But what kind of things should I be looking for? What would cause a loss of pressure as the oil warms up? What tools should I be getting to complete this? I've got the basic hand tools and know I will need a few more like a ring compressor, etc.

I'm keeping a positive outlook on this and figuring this will be a good learning experience for me.

thanks

stu...
My suspicions go to crank bearings. Things that go knock with a loss of oil pressure that comes back when cold, are usually a bearing going but not gone.

Climbing temp seems related to cooling system or really off timing. You may be looking at more than one problem, they could be related in terms of cause and effect.

Bogie
Bogie
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-24-2008, 07:09 PM
Registered User
 
Last photo:
Join Date: Jun 2008
Location: USA
Posts: 1,172
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
I am a big believer in using lights and beepers with the gauges.
You might miss a fluctuating gauge, but when red lights come on and beepers start sounding,,,, that is hard to ignore.
Saved me one engine several years ago.

Radio Shack beeper $ 5, light sending unit... $ 8 ?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-24-2008, 07:31 PM
Registered User
 
Join Date: Feb 2008
Location: Maryland
Posts: 20
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The car has idled in the garage for 10-20 minutes at a time, so I'm confident the cooling system and timing are ok. I was attributing the rising temperature to the lack of oil circulation. My experience has been that oil does a surprising amount of cooling.

I'll be pulling the engine later this week and will have a chance to check things a little closer.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-24-2008, 07:59 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,655
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
3 jobs of oil. Clean, Cool, and lubricate.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-24-2008, 09:32 PM
Registered User
 
Join Date: Aug 2008
Location: ohio
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I had a car that would lose oil pressurer every so often. It turned out to be a bad oil filter. check to see if you have a pressure valve in your filter. if not i would look at the mains.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-25-2008, 10:03 AM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,764
Wiki Edits: 0

Thanks: 4
Thanked 427 Times in 366 Posts
Quote:
Originally Posted by ScoTFrenzel
I am a big believer in using lights and beepers with the gauges.
You might miss a fluctuating gauge, but when red lights come on and beepers start sounding,,,, that is hard to ignore.
Saved me one engine several years ago.

Radio Shack beeper $ 5, light sending unit... $ 8 ?
Hopefully louder than the stereo. I ended up with a 289 powered 73 Ford Courier because the 4 cylinder lost a rubber plug off the back of the head. While that happened I was boppin' down the freeway listening to the Stones at a 120 db. by the time I saw the red light the rods and crank were toast.

Checked out the cost of replacing the motor and exclaimed to the guy at the parts counter, "I CAN PUT A V8 IN IT FOR THAT!!!!!!!" and so I did. Well at least the "V8" part happened, for the "that" part it took "that" and quite a bit more denero.

Bogie
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
oil pressure complete loss Jack Dore Engine 11 07-17-2008 08:56 AM
78' SBC oil pressure gauge hook up spot on block 85-monte Engine 6 05-11-2008 11:12 PM
Environmentally friendly honing fluid. F-BIRD'88 Engine 16 07-01-2007 10:06 AM
What is normal oil pressure on a SBC JMEDLEY001 Engine 22 12-31-2006 04:42 AM
oil pressure switch Blob Engine 7 12-02-2005 12:34 PM


All times are GMT -6. The time now is 06:27 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.