Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 10-06-2012, 08:23 PM
mikepedersen17 mikepedersen17 is offline
Junior User
 
Join Date: Jan 2010
Location: Shelby Mt
Posts: 52
mikepedersen17 is starting off with a positive reputation.
Question New Engine, Low Oil Pressure during Cam Break in

I have a 85 351W From a F-150 pick-up which I have recently rebuilt.
During cam break in I had a drop in oil pressure from 40 to 20 psi half way through break in, it then even got to about 15psi I shut it down, I wasn't sure if it was the gauge or something else.
I changed the oil and filter the oil was pretty dark but didn't have anything really noticeable as damage.
After I'd changed the oil I also added another gauge to double check the one I was using I then reprimed the oil pump with my drill, it went to 40psi both gauges after running engine after about 5 minutes oil pressure started to drop again.
My engine has a Comp Cams camshaft with flat tappet lifters which are also Comp Cams I initially used Joe Gibbs break in oil which has the ZDDP additive in it, second time I used 5w30 with Lucas Oil ZDDP additive, can any body help me out? Thanks
Reply With Quote
  #2  
Old 10-07-2012, 10:59 PM
mikepedersen17 mikepedersen17 is offline
Junior User
 
Join Date: Jan 2010
Location: Shelby Mt
Posts: 52
mikepedersen17 is starting off with a positive reputation.
I have been told it could be a cam bearing, can any body agree with this; could it be the oil pump please let me know.
thanks
Reply With Quote
  #3  
Old 10-08-2012, 11:25 AM
Conanski's Avatar
Conanski Conanski is online now
Post Fiend
 
Join Date: Jun 2006
Location: Ottawa, Ontario
Posts: 20,717
Conanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud of
What exactly did your "rebuild" include?
__________________
Paul (Conan) O'Brien

1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
Reply With Quote
  #4  
Old 10-08-2012, 01:17 PM
Cobra-Kai's Avatar
Cobra-Kai Cobra-Kai is offline
Senior User
 
Join Date: Jul 2012
Location: Peine, Germany
Posts: 210
Cobra-Kai is starting off with a positive reputation.
I see 3 possibilities:

1. broken Sensor -> maybe the pressure is fine

2. Oil Pump worn -> maybe the pump hold pressure as long as the oil is cold

3. Oil to thin -> Try a ?w40, ?w50 or ?w60 ans see if the gauge changes
Reply With Quote
  #5  
Old 10-09-2012, 10:15 PM
mikepedersen17 mikepedersen17 is offline
Junior User
 
Join Date: Jan 2010
Location: Shelby Mt
Posts: 52
mikepedersen17 is starting off with a positive reputation.
My rebuild of my 85 351w included having rotating assembly balanced, cylinders bored .030 over, resize connecting rods, hot tank block and install cam bearings and polish crank which were all done by a machinist also had new hypereutectic.030 pistons on to rods.
Comp Cams Xtreme 4x4 35-239-3 cam, Comp Cams High Energy lifters, Comp Cams High Energy alum roller rockers 1.6 and Comp Cams Hi-Tech push rods.
I also used Edelbrock E-street heads 5023 the ones with 1.90 intake valves, Edelbrock accudrive geardrive , Edelbrock victor series water pump also Edelbrock performer intake manifold.
The oil pump I believe is a melling, the distributer is a Pro Form HEI, I used Comp Cams Assembly lube on valve train components, I used Red Line assembly lube on main bearings, rod bearings cylinder walls rings and pistons.
I would appreciate any advice or input Im to the point of pulling engine to investigate which is not a big deal the front clip is off so a few hours it could be on a stand if needed.
Thanks Mike
Reply With Quote
  #6  
Old 10-10-2012, 01:34 AM
Beanscoot Beanscoot is offline
Posting Guru
 
Join Date: May 2007
Location: British Columbia
Posts: 1,509
Beanscoot is gaining momentum as a positive member of FTE.Beanscoot is gaining momentum as a positive member of FTE.
If you do get into the engine, I would check the clearance in the main and rod bearing journals with plastigage.
Reply With Quote
  #7  
Old 10-10-2012, 02:18 AM
big vann big vann is offline
Senior User
 
Join Date: May 2010
Location: BC Cana'duh
Posts: 369
big vann is gaining momentum as a positive member of FTE.
Could be oil pump failue or a spun bearing.Either way,you'll likely be pulling the engine.That's the only way to find the problem and correct it.As beanscoot said check the measurements of the journals and the clearances.Also check the torque specs before you disassemble.
Reply With Quote
  #8  
Old 10-10-2012, 01:26 PM
Kemicalburns's Avatar
Kemicalburns Kemicalburns is offline
Post Fiend
 
Join Date: Jul 2002
Location: OregonCity,OR
Posts: 13,367
Kemicalburns has a very good reputation on FTE.Kemicalburns has a very good reputation on FTE.Kemicalburns has a very good reputation on FTE.Kemicalburns has a very good reputation on FTE.
is that a standard volume pump or hi volume pump?

your using oil that is to thin. for engine break in for the first 3000 miles you should use delo or rotella 15w40, this will help the rings seat properly and gets all the crap out with each oil change. its a hi detergent oil.
__________________
-- FOR SALE g
94 XLT 357/E4OD/Warn HS9500I
6"ProComp Stage II 35x12.5x15 BFG AT's
4.88 gears/Aussie Front/rear open
Edelbrock efi intake JBA shorty,CustomY pipe/exhaust
http://www.supermotors.org/registry/...il.php?id=4158
Reply With Quote
  #9  
Old 10-10-2012, 09:52 PM
mikepedersen17 mikepedersen17 is offline
Junior User
 
Join Date: Jan 2010
Location: Shelby Mt
Posts: 52
mikepedersen17 is starting off with a positive reputation.
I decided today I am going to pull the engine, you guys are right I will check clearances and torques again, when I get it done again I will use a thicker oil I still need to finish cam break in, I wasn't planning on running the engine with the thinner oil I was hoping I clean something out by just priming, without spinning anything; but when I had the pressure back to 40 psi I got excited hoping it fixed itself, you guys have been there right!!
Thanks for your help, Mike
Reply With Quote
  #10  
Old 10-10-2012, 10:07 PM
mikepedersen17 mikepedersen17 is offline
Junior User
 
Join Date: Jan 2010
Location: Shelby Mt
Posts: 52
mikepedersen17 is starting off with a positive reputation.
By the way, I'm sure It is a standard oil pump It is what came with the engine rebuild kit
Reply With Quote
  #11  
Old 10-10-2012, 10:43 PM
Beanscoot Beanscoot is offline
Posting Guru
 
Join Date: May 2007
Location: British Columbia
Posts: 1,509
Beanscoot is gaining momentum as a positive member of FTE.Beanscoot is gaining momentum as a positive member of FTE.
With a proper rebuild, a standard oil pump and regular grade oil (i.e. manufacturer's recommended) will be fine.

A high volume pump is suitable to compensate for a worn engine or a rebuild with excessive bearing clearances.
Reply With Quote
Old 10-10-2012, 10:43 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
castrol syntec 5w50 in my flathead? jhaas63 1948 - 1956 F1, F100 & Larger F-Series Trucks 5 07-11-2013 11:23 AM
what oil are you running in your stock or built 300 fordboy300 Ford Inline Six, 200, 250, 4.9L / 300 18 04-06-2013 07:29 PM
Rotella HD or ZDDP Additive With a Rebuilt Engine? LARIAT 85 Oil & Lubrication 8 04-23-2010 11:50 AM
Which oil for break-in mlevario99 FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) 18 05-28-2008 11:30 AM
Engine oil WARNING--A must READ!!! mtford Oil & Lubrication 3 03-06-2007 09:05 AM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 08:03 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup