blown hg and valves hitting the pistons...help - Ford Powerstroke Diesel Forum

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post #1 of 8 Old 07-17-2012, 02:10 PM Thread Starter
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blown hg and valves hitting the pistons...help

I had my truck studded last fall and its been in the shop for 10weeks and i just heard back from them today. They said my hg were blown worse then they have ever seen and almost all the valves have touched the pistons. They said its from over reving the engine. I have innovative xrace tune i run as a dd and my shift points are right at 4k and they shift superfast. What else can cause this? Im afraid the shop is gunna try to not warrantee the hg and thats to expensive to redo every 8-10months.

Tony

2005 F250 crew cab lariat,

4" lift 325/65/18 tires, head studs, built trans, egr delete, powermax turbo, 58v ficm from swamps with mild flash, 4" straight pipe, sct with innovative xtreme street and race tune's, blue spring upgrade

Stage 3, 190/100 injectors, and full fuel system on the way.
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post #2 of 8 Old 07-17-2012, 02:31 PM
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IMO if they did the job before they took too much off of the heads thus decreasing the valve to piston clearance. If so, they are at fault.
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post #3 of 8 Old 07-17-2012, 02:36 PM
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Valve to piston contact can occur exactly like they are saying. When your engine revs so high, the valves can float - meaning that they don't compress all the way back to fully seat before being opened again. This can allow them to remain open and contact the pistons.

Shawn Carlson
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2005 F250, CCSB, 6.0 PSD, FX4 (The Sweet Unit is white)
2008 F350, CCLB, 6.4 PSD (Brad-the wife's truck is black)




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post #4 of 8 Old 07-17-2012, 02:39 PM
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Quote:
Originally Posted by Evil Eye View Post
Valve to piston contact can occur exactly like they are saying. When your engine revs so high, the valves can float - meaning that they don't compress all the way back to fully seat before being opened again. This can allow them to remain open and contact the pistons.
Correct, but how come almost everyone else can run those tunes and drive like a mad man and never have these issues? I think his prior work is to blame if he is in fact right about his shift RPMs. Just my 2c
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post #5 of 8 Old 07-17-2012, 02:44 PM Thread Starter
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They said they checked the clearances from the valves to the heads and it was "well within spec".

Tony

2005 F250 crew cab lariat,

4" lift 325/65/18 tires, head studs, built trans, egr delete, powermax turbo, 58v ficm from swamps with mild flash, 4" straight pipe, sct with innovative xtreme street and race tune's, blue spring upgrade

Stage 3, 190/100 injectors, and full fuel system on the way.
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post #6 of 8 Old 07-17-2012, 02:45 PM
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I would tend to agree. I didn't read in your original post where they did anything to the heads when the HG's were replaced. Did they "shave" them down to get them flat and true? What about the block?

***Edit: Well, that answers that.

Shawn Carlson
EvilEye@powerstroke.org

Proud Navy Vet
2005 F250, CCSB, 6.0 PSD, FX4 (The Sweet Unit is white)
2008 F350, CCLB, 6.4 PSD (Brad-the wife's truck is black)




Engine Mods:
Fluidampr
CCV Reroute (Reinstated)
4" MBRP Exhaust
MTW Stage 1 Turbo
Bulletproof 53V FICM
BulletProof EGR Cooler
BulletProof Water Pump
Riff Raff Intercooler Boots
Gogo Diesel Direct Drive Solenoid
BulletProof All-Aluminum Radiator
BulletProof All-Aluminum Intercooler
BulletProof Oil Cooler System w/ Bypass Filter
SCT w/ Custom Tunes (TSD, DJ's, Innovative, Gearhead, QuickTricks)

Exterior Mods:
Bilstein 5100 Shocks
Icon Adjustable Trac Bar
Firestone RideRite Air Bags
BDS Dual Steering Stabilizer
Aluminum Finned Differential Cover
Reese 16k Manual Slider 5th Wheel Hitch
Icon 2.5" Leveling Kit w/ F-350 rear blocks
20" BMF Novakanes wrapped in 33" Nitto Terra Grapplers
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post #7 of 8 Old 07-17-2012, 02:50 PM Thread Starter
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When i did the head studs because my stock gaskets were blown they fixed a crack in my head and never even gave me the option of just replacing it. The head shop is separate from the place that did my hg. I just think its odd they blew and then my valves are hitting also when i didnt have the problem before getting studded.

Tony

2005 F250 crew cab lariat,

4" lift 325/65/18 tires, head studs, built trans, egr delete, powermax turbo, 58v ficm from swamps with mild flash, 4" straight pipe, sct with innovative xtreme street and race tune's, blue spring upgrade

Stage 3, 190/100 injectors, and full fuel system on the way.
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post #8 of 8 Old 07-17-2012, 02:53 PM Thread Starter
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The did plane the heads and fix the one crack the last time. And they just told me today they still looked fine and all the clearances were right. Could it be possible my valve springs are getting weak? I have 170k on my truck

Tony

2005 F250 crew cab lariat,

4" lift 325/65/18 tires, head studs, built trans, egr delete, powermax turbo, 58v ficm from swamps with mild flash, 4" straight pipe, sct with innovative xtreme street and race tune's, blue spring upgrade

Stage 3, 190/100 injectors, and full fuel system on the way.
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