7.3L Power Stroke Engine and DrivetrainDiscussion of the 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
Alright-my truck broke down on the way home from ny, ended up I snapped an exhaust rocker arm and bent a pushrod. Fixed it, managed to get home with a slight tick getting louder as I progressed, then started romping on it a bit more after I made it. In any event, it started running VERY poorly. I got home, pulled the V/C's, and found many, many, many bent pushrods and broken rocker arms. intake, exhaust, all of them. Mainly on the passenger side engine bank. This wasn't an issue until I installed the GTP38r and headstuds, im making 35ish on the boost gauge, and the truck SEEMS to run fairly well until it explodes. Im going to be ordering a longblock from BDP, but in the meantime, Id like to get it going. I was told that the boost is blowing my valves open, but WHY exhaust valves? I can see intake....
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BRIGHT RED Early 99' PSD Crew Cab Longbox F-250:
PERFORMANCE
-pmt late computer
-Dp 6 position chip (stock, tow, 80, 120, 140 xtreme, high idle)
-Factory Tech Monster Box
-ARP headstuds
-Garrett Gtp38r with 1.15 exhaust housing and no wastegate or ebv
-4" stainless mbrp exhaust w/6" tip
-Tymar intake
-stealth dual 17* hpops with dual IPR's
-bds 238cc a codes
-regulated return fuel system
-Triple gauge pod
-dahl 150 seperator
OTHER
-8" Pro-comp/shackle lift, 6 shocks up front, 4 in the rear
-dual steering stabilizers
-37" M/T Baja Claw radials on 16x12 M/T wheels
-carr hoops steps for each door
-2 mtx subs, mobile a/v system
-15 percent tint all around
-complete 2006 chrome package front grille, bumper, lights, and badges.
-bull bar
-chrome handles/mirror covers/tailight guards
AWAITING INSTALL:
Hopefully an intercooler and some methanol once I get this thing going....
could be that you are having too much back pressure on the exhaust side dont realy see why you are only bendin exhaust valves though.
Could have a restrition in the up pipes, being that you are building so much boost how much, is to much on a stock motor
when i had the supercharger on my lightning i had similar issues but bent intake valves also but like you said only on one side
double check the intake valves I could barely tell on mine!
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2000 f250 extened cab with topper, 8 in Front 4in rear, 37x13.50x18 toyo mt, custom bumper, optimo yellow tops, 6 pos sniper w/di tunes, 4in turbo back exhaust w/muff delete, autometer z-series guages, K-and-N fipk2 kit, Boost fooler, Zoodad mod, foil removed and polished, wheelen strobes, memphis belle amp with kicker components and a cvr dvc 12. <font color="blue">LINK TO PICS</font>
Im bending BOTH intake and exhaust pushrods! sorry, I was stating that I was curious WHY exhaust were also bending...upipes.pedistal.etc is all new....my turbo has the 1.15 housing, my egt's are LOW, and my exhaust isn't all that restrictive....Mike
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BRIGHT RED Early 99' PSD Crew Cab Longbox F-250:
PERFORMANCE
-pmt late computer
-Dp 6 position chip (stock, tow, 80, 120, 140 xtreme, high idle)
-Factory Tech Monster Box
-ARP headstuds
-Garrett Gtp38r with 1.15 exhaust housing and no wastegate or ebv
-4" stainless mbrp exhaust w/6" tip
-Tymar intake
-stealth dual 17* hpops with dual IPR's
-bds 238cc a codes
-regulated return fuel system
-Triple gauge pod
-dahl 150 seperator
OTHER
-8" Pro-comp/shackle lift, 6 shocks up front, 4 in the rear
-dual steering stabilizers
-37" M/T Baja Claw radials on 16x12 M/T wheels
-carr hoops steps for each door
-2 mtx subs, mobile a/v system
-15 percent tint all around
-complete 2006 chrome package front grille, bumper, lights, and badges.
-bull bar
-chrome handles/mirror covers/tailight guards
AWAITING INSTALL:
Hopefully an intercooler and some methanol once I get this thing going....
well one reason is the passenger side bank has the shortest distance to travel before it reaches the turbo but im still trying to figure out what your prob is
Is the turbo surging at all or does every thing seem normal?
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2000 f250 extened cab with topper, 8 in Front 4in rear, 37x13.50x18 toyo mt, custom bumper, optimo yellow tops, 6 pos sniper w/di tunes, 4in turbo back exhaust w/muff delete, autometer z-series guages, K-and-N fipk2 kit, Boost fooler, Zoodad mod, foil removed and polished, wheelen strobes, memphis belle amp with kicker components and a cvr dvc 12. <font color="blue">LINK TO PICS</font>
can someone please tell me WHY a blown headgasket would bend pushrods? im curious.....Ive heard that before, but don't understand. As for surge, I really don't think so, pitch changes a bit uphill at low rpm (sounds like a steady blowing) but boost gauge never fluctuates/runs strong. Everything SEEMS normal. The main issue is the first cylinder (front) on the passenger bank. That one is the only constant! Mike
__________________
BRIGHT RED Early 99' PSD Crew Cab Longbox F-250:
PERFORMANCE
-pmt late computer
-Dp 6 position chip (stock, tow, 80, 120, 140 xtreme, high idle)
-Factory Tech Monster Box
-ARP headstuds
-Garrett Gtp38r with 1.15 exhaust housing and no wastegate or ebv
-4" stainless mbrp exhaust w/6" tip
-Tymar intake
-stealth dual 17* hpops with dual IPR's
-bds 238cc a codes
-regulated return fuel system
-Triple gauge pod
-dahl 150 seperator
OTHER
-8" Pro-comp/shackle lift, 6 shocks up front, 4 in the rear
-dual steering stabilizers
-37" M/T Baja Claw radials on 16x12 M/T wheels
-carr hoops steps for each door
-2 mtx subs, mobile a/v system
-15 percent tint all around
-complete 2006 chrome package front grille, bumper, lights, and badges.
-bull bar
-chrome handles/mirror covers/tailight guards
AWAITING INSTALL:
Hopefully an intercooler and some methanol once I get this thing going....
Its kind of hard to explain
the reason for the blown head gasket is when the head gasket blows you are loosing compression and when the others fire you get blow back through the manifold (path of least resistance) ok then which causes pressure agains the valves which are trying to close and have air/combustion opening them back up (bad things happen such as bent and broken eng parts)
If that makes any since to you
we have had that on out 903 cummins
If you want to you can call me and i can better explain it!
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2000 f250 extened cab with topper, 8 in Front 4in rear, 37x13.50x18 toyo mt, custom bumper, optimo yellow tops, 6 pos sniper w/di tunes, 4in turbo back exhaust w/muff delete, autometer z-series guages, K-and-N fipk2 kit, Boost fooler, Zoodad mod, foil removed and polished, wheelen strobes, memphis belle amp with kicker components and a cvr dvc 12. <font color="blue">LINK TO PICS</font>
well, the lifters are still in place-they haven't moved....
__________________
BRIGHT RED Early 99' PSD Crew Cab Longbox F-250:
PERFORMANCE
-pmt late computer
-Dp 6 position chip (stock, tow, 80, 120, 140 xtreme, high idle)
-Factory Tech Monster Box
-ARP headstuds
-Garrett Gtp38r with 1.15 exhaust housing and no wastegate or ebv
-4" stainless mbrp exhaust w/6" tip
-Tymar intake
-stealth dual 17* hpops with dual IPR's
-bds 238cc a codes
-regulated return fuel system
-Triple gauge pod
-dahl 150 seperator
OTHER
-8" Pro-comp/shackle lift, 6 shocks up front, 4 in the rear
-dual steering stabilizers
-37" M/T Baja Claw radials on 16x12 M/T wheels
-carr hoops steps for each door
-2 mtx subs, mobile a/v system
-15 percent tint all around
-complete 2006 chrome package front grille, bumper, lights, and badges.
-bull bar
-chrome handles/mirror covers/tailight guards
AWAITING INSTALL:
Hopefully an intercooler and some methanol once I get this thing going....
Maybe week springs [img]/ubbthreads/images/graemlins/shrug.gif[/img] You can install a little stiffer valve spring from comp cams from summit. Was around $80 and drop right in.
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2000 F250 4X4,CC,SB,AUTO
Powered by some bolt on stuff from
BEANS and BTS, #2 only
463HP 991TQ 10/01/05 mustang dyno 10k rollers
458HP 923TQ 04/14/07 Dynojet dyno
Here are a couple of WAGs that depend on knowledge I don't have. [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]
Your engine was just built, right? Are our engines "interference" engines, such that the piston can hit the valves if the cam timing is off? If so, maybe your cam timing is off.
This one's really a long shot: is it possible you've got a blown head gasket that's letting a little bit of (incompressible) coolant into the cylinder, not enough to cause full hydrolock but enough to push back on an open exhaust valve? I don't know if this can even happen, anywhere, anytime, but I'm grasping at straws and thought it'd be fun to show off just how limited my knowledge is! (oops, did I type that out loud?)
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Early 1999 (2/98) Cali-spec F-250 XLT SD CC 7.3 2WD Short Bed Auto - Triple Gauges - Ford AIS with Fender Sleeve mod - Banks BHA - NCHornet CCV mod - BTM - '06 seats - John Wood trans - 6.0 trans cooler - DP-Tuner F5 chip 40T/60T/80E/120 - ITP Overboost Annihilator - DI Regulated Return - Terminator dual HPOP - Airdog
Just built your motor? If you even just skim the top of the block to remove the HG the valves will hit the pistons. It is that tight. I saw this happen to another 7.3.
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I see stupid people. They're everywhere. They walk around like everyone else. They don't even know that they're stupid. AND THEY POST ON THIS SITE!
Early '99 7.3 Superduty. Built 3-98
Chassis: Supercab SB, Lifted w/ 20's.
Tranny: Suncoast parts built by the local guy.
Engine mods: Diesel Innovations all the way (tuning, injectors, & turbo), Homemade "Big Oil", GT42R Big frame turbo. Rods and junk to keep it all together.
[ QUOTE ]
Your engine was just built, right? Are our engines "interference" engines, such that the piston can hit the valves if the cam timing is off? If so, maybe your cam timing is off.
[/ QUOTE ]
He is bending both intake and exhaust. That eliminates cam timing. The problem has got to be too many RPM's for the parts being used or not enough valve to piston clearance. Maybe both.
If it's a newly built engine, How much valve to piston clearance was there? What was the open and closed spring pressure?
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2000 F250 Lariat CC SB 4x4 PSD Auto
Linear Mode
