Coolant leaking out of cap at 20psi - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 07-18-2012, 04:24 PM Thread Starter
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Question Coolant leaking out of cap at 20psi

Got a 2005 6.0 that's loosing coolant and I can't figure out why.
Back in Sept 2011 the oil cooler went out so my son and I tore the motor down, had the heads checked and magnafluxed (checkout out fine), replaced the oil cooler, did a package deal from Sinister with EGR delete, ARP head studs, black onyx gaskets, coolant filter, SCT Tuner etc. Already had a Edge CTS and currently the temperatures run around 200 degrees give or take 4 degrees. About three weeks ago, one of the glow plugs had gone bad and we replaced it and the wiring harness on the passengers side. When we got done we noticed that the coolant was low and have been chasing the coolant ever since. It comes out the cap apparently (which has also been replaced) and the pressure runs at about 18-20 psi. Any troubleshooting ideas? I've got no codes and the motor really isn't running that hot, just the coolant keeps disappearing!

Thanks much!

'05 F-250 Superduty 4x4x4 (4 door 4 X 4)
-----MBRP 4" Turbo Back Cool Duals, SCT X3 Tuner, Edge CTS with B/U camera, ARP Head studs, EGR Delete, from Sinister Mfg.
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post #2 of 8 Old 07-18-2012, 06:08 PM
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sounds like you are pushing water... suspect faulty head bolt torque OR bad head gaskets... black onyx ftl
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post #3 of 8 Old 07-18-2012, 06:14 PM
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I have heard it's best to stick with oem gaskets some people have had bad luck with the black onx I hope that it turns out to be something simple and I'm wrong

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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post #4 of 8 Old 07-18-2012, 06:31 PM
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95% chance the black onyx gaskets failed. Your cooling system should operate at around 2-4psi no higher and if it's 18-20psi your gaskets are blown.

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post #5 of 8 Old 07-18-2012, 06:42 PM
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Bo did come out with a new design but I wouldn't trust em
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post #6 of 8 Old 07-18-2012, 07:20 PM
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Sorry to say: Head Gaskets are gone

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
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post #7 of 8 Old 07-19-2012, 07:06 PM
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Not to hijack, but, if his black onyx gaskets did fail, does he have to send his heads to a machine shop again? Just curious for personal gain...

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2003 F-350 6.0L.
Leveling kit
35/12.50-20 Federal Couragia M/T
20x10 black Fuel Hostage wheels
4"-5" exhaust no cat
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Edge Insight CTS
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Zoodad mod
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http://www.powerstroke.org/forum/attachments/chat-bs/33964d1329365089-ccr-artwork-ccr-logo.jpg
To Do/Wish list:
FICM tune
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post #8 of 8 Old 07-19-2012, 07:23 PM
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Yes. Anytime you take the top end apart you should at least send them out to get checked for cracks and make sure the deck is flat. Not saying that they have to be machined but should always be sent out the be checked.

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