Diagnosing oil use bad on 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 10-12-2013, 02:30 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
Diagnosing oil use bad on sbc

Hello all, I have sbc in bros hot rod and is using alot of oil,so is it rings,valve seals/guides? Actual mileage unkown but in hot rod from older couple bought last year,so I dont think its alot...but never know.Anyways want to diagnose to see which it is without tearing whole motor apart first.How can one or best way to test for each?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-12-2013, 07:01 AM
delawarebill's Avatar
Registered User
 
Last photo:
Join Date: Mar 2009
Location: delaware
Posts: 1,272
Wiki Edits: 0

Thanks: 16
Thanked 68 Times in 68 Posts
engine check

u can do a leak down test, but u need valve and gage and stuff to do it. easy thing is compression test x2.. do a test the way it sits, then put in about a table spoon of oil into the cyl and run it around a few times to seal the rings. do the test again and compare the readings. with oil and if it goes up 20 or 30# or more then its the rings. stays the same (more/less) it'll be in the valving seats and can require a valve job and guide work.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-12-2013, 07:36 AM
jokerZ71's Avatar
Wrench Turner
 
Last photo:
Join Date: Jun 2013
Location: Stanton,Tn.
Age: 52
Posts: 2,041
Wiki Edits: 0

Thanks: 136
Thanked 344 Times in 307 Posts
You could also have an intake gasket leaking.The leakdown test would be a more accurate way to pinpoint the problem if you can't figure it out from a compression test.The 1st thing you should do is pull the sparkplugs & examine them so you see which cylinders may be getting oil thru them.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-12-2013, 07:59 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
I don't see how a valve job would make a difference unless guides are so bad causing seals to wear bad . Also I hav done compression tests before on known good motors then added oil to cylinders and rose more then 30 before. Plus I would think most leak down tests would be for checking the valves leaking more then anything?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-12-2013, 08:02 AM
RWENUTS's Avatar
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Nanaimo, BC, Canada
Age: 63
Posts: 1,989
Wiki Edits: 0

Thanks: 59
Thanked 212 Times in 200 Posts
First thing I'd do is the free no frills, no tools required clean up of the engine from top to bottom, back to front until it's spotless. THen start it up and find where it's leaking.
Rule of thumb from years ago!
'One drip every 100 feet burns a quart of oil every 1000 miles'!!
Cure the oil loss due to leaks first then if it's still bad do the leakdown and compression tests to pinpoint it.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-12-2013, 08:07 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
Hotrod is spotless with zero oil or anything for that matter on it anywhere
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-12-2013, 08:09 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by jokerZ71 View Post
You could also have an intake gasket leaking.The leakdown test would be a more accurate way to pinpoint the problem if you can't figure it out from a compression test.The 1st thing you should do is pull the sparkplugs & examine them so you see which cylinders may be getting oil thru them.
Just curious how leaking intake would work, if it's leakin inside that would also mean it would have a vacuum leak inside and have drivability issues but it runs great
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-12-2013, 08:10 AM
jokerZ71's Avatar
Wrench Turner
 
Last photo:
Join Date: Jun 2013
Location: Stanton,Tn.
Age: 52
Posts: 2,041
Wiki Edits: 0

Thanks: 136
Thanked 344 Times in 307 Posts
On a compression test,you want to ck for uniformity between cylinders rather than any specific psi.It could be seals alone,or,seals & guides.Or as I said earlier,an intake gasket could be allowing your intake valves to suck oil into cylinder.A leakdown test is usually done after a compression test to help pinpoint problem area.Inspecting plugs will also show if certain cylinders are more of a problem than others.There are a # of reasons a motor uses oil.Even a plugged PCV system.The above test are starting points to help determine where your problem may be.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-12-2013, 08:14 AM
jokerZ71's Avatar
Wrench Turner
 
Last photo:
Join Date: Jun 2013
Location: Stanton,Tn.
Age: 52
Posts: 2,041
Wiki Edits: 0

Thanks: 136
Thanked 344 Times in 307 Posts
How much oil is the engine using ?
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-12-2013, 08:18 AM
jokerZ71's Avatar
Wrench Turner
 
Last photo:
Join Date: Jun 2013
Location: Stanton,Tn.
Age: 52
Posts: 2,041
Wiki Edits: 0

Thanks: 136
Thanked 344 Times in 307 Posts
Quote:
Originally Posted by sqeezeit View Post
Just curious how leaking intake would work, if it's leakin inside that would also mean it would have a vacuum leak inside and have drivability issues but it runs great
Not necessarily.The oil being pulled thru on a very small leak can mask the effects of the leak making it not as noticeable.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 10-12-2013, 08:20 AM
RWENUTS's Avatar
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Nanaimo, BC, Canada
Age: 63
Posts: 1,989
Wiki Edits: 0

Thanks: 59
Thanked 212 Times in 200 Posts
Quote:
Originally Posted by sqeezeit View Post
Hotrod is spotless with zero oil or anything for that matter on it anywhere
Awesome!!
Try the 4 dollar (a gallon of gas)no tools test.
Get your bro' to follow you down the road. Find a road with a steep hill on it.
Going down back off on the loud pedal and if it's smokin' blue out the pipes it's bad guides. Going up the hill if it's pushing blue it's bad rings.
I'm not being a wisea---s. Just old guy field tests before you spend the money in the wrong place.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 10-12-2013, 08:21 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by jokerZ71 View Post
On a compression test,you want to ck for uniformity between cylinders rather than any specific psi.It could be seals alone,or,seals & guides.Or as I said earlier,an intake gasket could be allowing your intake valves to suck oil into cylinder.A leakdown test is usually done after a compression test to help pinpoint problem area.Inspecting plugs will also show if certain cylinders are more of a problem than others.There are a # of reasons a motor uses oil.Even a plugged PCV system.The above test are starting points to help determine where your problem may be.
understand, but just not following how leaking intake gasket would be and still run fine with no signs of lean condition or eratic idle,ect..is all
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 10-12-2013, 08:22 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
It uses a quart+ in less then 250 miles
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 10-12-2013, 08:25 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by RWENUTS View Post
Awesome!!
Try the 4 dollar (a gallon of gas)no tools test.
Get your bro' to follow you down the road. Find a road with a steep hill on it.
Going down back off on the loud pedal and if it's smokin' blue out the pipes it's bad guides. Going up the hill if it's pushing blue it's bad rings.
I'm not being a wisea---s. Just old guy field tests before you spend the money in the wrong place.
No i hear ah the simple things sumtimes work,but all I know is it smokes when u first start and after that cant really tell.I know you would think with that much oil use it would smoke the skeeters away,but dont really see much.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 10-12-2013, 08:30 AM
sqeezeit's Avatar
Registered User
 
Last photo:
Join Date: Apr 2013
Location: ND
Age: 36
Posts: 309
Wiki Edits: 0

Thanks: 29
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by jokerZ71 View Post
Not necessarily.The oil being pulled thru on a very small leak can mask the effects of the leak making it not as noticeable.
I was thinking this also but have never seen it, but anythings possible. With a small use I would think maybe but dam with that much oil use a guy would think it would run like shiz also
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
good oil pressure bad oil on rockers makennoise Engine 2 12-27-2011 11:20 AM
Diagnosing engine noise SBC 350 DQ81 Engine 29 02-05-2011 02:53 PM
What oil pump would be good for 350 SBC? Heard bad news about melling eric32 Engine 11 02-15-2009 02:48 PM
Diagnosing week cylinders 350 SBC driveability Engine 59 03-02-2007 09:18 PM
Diagnosing Bad Catalytic Converter deleteall Engine 4 04-14-2003 04:43 PM


All times are GMT -6. The time now is 05:26 PM.


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.