Injectors - how many miles ? - Diesel Forum -
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 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.

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post #1 of 6 (permalink) Old 08-09-2006, 04:04 AM Thread Starter
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Injectors - how many miles ?

How many miles should I expect to get from the injectors in my 2001 F-350, before I notice a drop in power.I have changed the fuel filter & air cleaner. Thanks for any & all replies.
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post #2 of 6 (permalink) Old 08-09-2006, 08:49 AM
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Re: Injectors - how many miles ?

How many miles have you got on your engine now?? I've got just over 111,000 miles on my 2000 and it runs very strong. What do you mean when you say you've changed the fuel and air filter?? You've just now changed them?? The fuel filter should be changed about every 15k or as needed sooner if you get bad fuel. I don't know about the air filter, mine is reuseable and I just clean as needed. You can add diesel additives to your fuel to help keep the injectors clean.

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post #3 of 6 (permalink) Old 08-09-2006, 08:05 PM
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Re: Injectors - how many miles ?

A friend of mine has 630,000 on his O2 and he has never changed any injectors some people get lucky and some go out nomatter how good you take care of your truck

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post #4 of 6 (permalink) Old 08-09-2006, 10:06 PM
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Re: Injectors - how many miles ?

Injector life depends on two main factors. Fuel quality and oil quality.

One bad tank of fuel, contaminated with water, or gas, for instance can (and will, usually) wipe out an entire set of injectors. Not the entire injector of, ourse, but the "heart" of the injector, which is the plunger and barrel assembly.

The fitment between these tow parts (think fitment of piston to cylinder wall) is on the order of 20-30 millionths of an inch.

ANy loss of lubrication will gall these parts in an instant...rendering them useless. Loss of lubrication can also occur when fuel pump goes out, but usually the siphoning action of these parts will actually pull fuel, through the feed lines, and the truck will still run.

That's why clean, well filtered fuel is esential to happy injectors.

On the oil side of the injector, the main wear area is the poppet valve.

This valve opens and closes (similar to a valve in a cyl head) metering the oil into and out of the injector.

With crappy oil, the poppet valve (& seat) will wear much more quickly than with "good" oil.

But at some point, after millions of injection events, the valve and its seat will wear (just from the shear repetitive beating of closing the valve over and over)

When the poppet seat wears, some internal tolerances get all jacked up within the injector...requiring machining to get them back into spec.

If you kept good quality, well filtered fuel in the truck (no water, no gas, etc) then the poppet will usually start showing its wear after 175,000-225,000 miles...

We've seen sets come in with 400,000 miles that had wear, but were still functioning...albeit a little out of balance.

We've also seen sets come in with less than a 100,000 on them that were totally jacked from crappy oil...

As an average life expectancy, I'd say after about 200,000 miles you might need them looked at, and brought back into spec...

Typical poppet valve issues are that a truck runs good cold, but rough when warm...thicker oil can bridge the gap of a poorly sealing poppet than when the oil thins out when hot.

take care~


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post #5 of 6 (permalink) Old 08-09-2006, 11:43 PM
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Re: Injectors - how many miles ?

I lost 2 in 3 weeks at 140k, the fuel was suspect.

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post #6 of 6 (permalink) Old 08-10-2006, 02:19 AM Thread Starter
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Re: Injectors - how many miles ?

Thanks for the replies fellows, my truck has been regularly serviced at the due milage, it has just a hundred thousand miles on it & I thought I may be a bit short of power at the top end, but maybe I was hauling more than I thought at the time.
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