degas pressure need advice - Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 10-20-2013, 09:32 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Jun 2010
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
degas pressure need advice

The truck in last 15 000 miles has new ford heads with stock gaskets and arps egr bypass and oil new cooler. Its getting cold here so I was installing new oe ford injectors and noticed some white residue near rhe degas cap so I replaced the cap last weekend. 300 miles later i have a touch more degas white residue.

I just hooked up a pressure gauage and between full throttle and a degas psi increase only happened once out of ten full trottle runs. That time though it did get up around 17 psi. The rest of the time it seams to set itself at about 7.5 psi not caring on how its driven.
sam_sso is offline  
post #2 of 5 Old 10-20-2013, 10:02 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Jun 2010
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
btw when i did injectors it sat parked for a day to to rain and when i removed a small hose from the degas it had pressure still after 2 days of sitting
sam_sso is offline  
post #3 of 5 Old 10-21-2013, 07:49 PM
Member
 
Join Date: Jun 2013
Location: CA
Posts: 64
Thanks: 1
Thanked 3 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I heard the theory that under heavy load the heads can lift and raise the coolant pressure, that will stay good under lower loads.
But this is extreme theory and you might have several other issues before come to this conclusion.
What is your delta?

http://www.powerstroke.org/forum/signaturepics/sigpic220138_1.gif2007 F350 dually/5000 lb, 12' tall camper.
Kajtek1 is offline  
post #4 of 5 Old 10-26-2013, 09:45 PM
Compression Ignition Addict
 
Join Date: Sep 2012
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
What is your ratio? I noticed with elc that I was running about 43/57 and the coolant was flash boiling making pressure, and now with 65/35 its fine. Just my two cents

468 HP & 873 Ft-Lbs

2005 F-350 SRW 4x4 CC Long Bed
SPD tune by Chris @ Truck Source Diesel
ARP Head Studs
3.5" DP to 4" Straight Pipe
Banks High Ram Air Intake
K&N CAI
Edge Evo CTS w/ Backup Camera to monitor
MTS HD Direct Drive Solenoid

Updated:
Standpipe & dummy plugs
Turbo feed & drain tubes
HPOP & IPR screens
Blue Spring
ajfrac is offline  
post #5 of 5 Old 10-27-2013, 05:41 AM
Premium Member
 
Join Date: Aug 2009
Location: Somewhere Between Good and Bad
Posts: 1,930
Thanks: 10
Thanked 61 Times in 60 Posts
Mentioned: 6 Post(s)
Quoted: 22 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by sam_sso View Post
The truck in last 15 000 miles has new ford heads with stock gaskets and arps egr bypass and oil new cooler. Its getting cold here so I was installing new oe ford injectors and noticed some white residue near rhe degas cap so I replaced the cap last weekend. 300 miles later i have a touch more degas white residue.

I just hooked up a pressure gauage and between full throttle and a degas psi increase only happened once out of ten full trottle runs. That time though it did get up around 17 psi. The rest of the time it seams to set itself at about 7.5 psi not caring on how its driven.
Were the new heads checked for flatness? Ford heads are notoriously not flat.

I had a similar issue before I studded. Under a load I could see 22 psi in the cooling system, and the cap would vent as it's supposed to. Now I see 7 - 8 psi coolant pressure, which is just the temperature fluid expansion pressure.

2006 CC SB 4x4 6.0L
KC Stage 1.5
BPD 6 Phase 53v FICM, EGR, HD Oil Cooler, Bypass Oil Filter & Water Pump
ARP Studs w/ OEM Gaskets
DC Power 190a upper; DB Electric 200a lower alternator
295/65/20 Toyo MTs
PMF 3 Link
7,500LB Tuff Trucks Leveling Coils
Icon 2.5 piggyback CDC shocks
Dynatrac Free Spin Kit with Dynaloc Hubs
EDGE CTS Monitor w/ EGT, pressure, and temp sensors
Blue FPR Spring Kit
Twin F450 Auxiliary Springs
Banks Monster Exhaust
Truetrac rear/E locker Front with 4.11s
skanj0 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

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.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome