injector seals? - Ford Powerstroke Diesel Forum
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Old 09-17-2013, 06:50 AM
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Cool injector seals?

I've been trying to diagnose a low icp pressure at wot.
At a idle with hot oil Icp is about 575 and Ipr is 11, 14 cold. The Icp will ramp up to almost 2800 psi with 45% Ipr until maybe 50% throttle. It then quickly drops to 1800 psi. It'll hold this all the way up and with my newly cleaned Ipr I can get to 90% duty cycle. That's on the 120 hp Dp tune.
The ex starts and runs great! Not seeing any oil in the fuel, just feels past half throttle. Fxr return should be keeping fuel pressure up but I've only checked at idle not load. It just rolled over 200,000 so I'm thinking it can't hurt. Has anyone used the hercules spiral backer ring?

Any guesses? Looking for an excuse to upgrade the hpop!
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Old 09-22-2013, 08:22 AM
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RE

You should take the tune off when ever taking engine readings if you want a real diagnosis. Tunes can give you false readings or so I've heard.

At idle your readings should be:
ICP PSI 475 or so
Duty Cycle 10-14%

At WOT Starting at 60mph to 90mph
Healthy HPOP
ICP PSI 2800 +
Good HPOP
ICP PSI 2500 +
So So HPOP
ICP PSI 2200 +
Anything under 2200 replace soon
Anything under 1900 replace now

Duty cycle should be 40 ish if I remember correctly but double check that.
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Old 09-23-2013, 01:57 AM
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How much do the injector bolts torque at? 10-12 ft lbs?
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Old 09-23-2013, 02:01 AM
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I tried it this morning in the stock setting.
IPR was about 37%
ICP held 2700 at WOT.
But in stock won't the oil requirement be a lot less?
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Old 09-23-2013, 04:20 AM
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Found some good info here on torque.
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Old 09-24-2013, 07:07 AM
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I'm still confused. I'm going to do the injector seals just because I assume they're due and the glow plugs just because I'm in there. But still wondering why the icp drop in the higher chip and throttle positions. I could do a T 500 while I'm under the hood.
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Old 09-24-2013, 09:13 AM
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"10 foot pounds isnt nearly enough, usually they seat, and a few hundred miles they "seat in" and loosen up a little. Get the collar down over the top bolt, use a man's hand or a rubber mallet to get the injector seated, start the bottom bolt, a few smacks on the top with a rubber mallet, tighten it down tight with a 1/4" ratchet, then smack it some more with the rubber mallet, and recheck with a torque wrench, should be AT LEAST 10 lbs on it."

Copied this. sounds right.
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