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Old 01-28-2014, 01:58 PM
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injector cup install

I posted this in the general discussion section also but maybe more techs will see it here!


Hello,
So im helping a friend replace all of his injectors and i noticed #5 had a copper washer failure. I plan on changing the injector cup but cant find any real information on the process.
Basicly i have all of the antifreeze drained, even the plug was pulled behind the starter to ensure all of the liquid was out. Im going to purchase the whitaker tool and ive watched the videos on the site but they didnt mention anything about using loctite on the new cup for sealant?

Is this something that should be done? Do i put red loctite around the entire outside of the cup?? Help!

Are there any steps i missed or anything i should look out for?

Thanks!
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Old 01-28-2014, 02:04 PM
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If you aren't working on a 7.3L, I wouldn't sweat the cups at all. If this is a 6.0L, They rarely are damaged. Clean the cup with a brush, reseal/replace the injectors. Replace the hold down on the injector with the washer failure. Replace the fuel inlet banjo bolt, as they have a check valve in them that can be damaged by combustion gas in the fuel system. Verify proper fuel pressure after you are done, or you will be doing it again.
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Old 01-28-2014, 02:25 PM
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Thanks for the reply! This is a 6.0 im working on. Here is a picture of the injector, obviously its the darker of the 2.

I figured since the injector was pitted so bad the cup would be also, i have no idea how long its been like this. But I will check out the cup a little closer tomorrow. Thanks!
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Old 01-28-2014, 03:53 PM
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As mentioned the cups on a 6.0 are stainless steel and do not fail real often.
I do notice your old injector has a nick in one of the o-rings this may have been part of your problem or a result thereof.
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Old 01-29-2014, 06:41 AM
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Unless the cup is cracked, I doubt that it's the problem. It's more likely a bad washer or it's not torqued properly.
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