Replacing injectors in a stagnant motor. - Ford Powerstroke Diesel Forum
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Old 12-13-2010, 09:51 AM
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Arrow Replacing injectors in a stagnant motor.

I am sort of rebuilding a motor that has been sitting for a while. I am replacing the injectors in it because the PO said that when it was still in the truck, it needed injectors.
I drained the fuel rails before I pulled the injectors but there was still some oil and fuel that ran down into the cylinders. How do I purge that out so I dont get hydrolocked.
Also when I pulled the old injectors out of the heads, the fuel had varnished up a bit and sort of looks a little brown and rusty. Do I need to clean out the holes where the injectors go into? And how do I do it?

Thanks guys.
-Schnot
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Old 12-13-2010, 10:06 AM
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As far as the little bit of fuel and oil that went into the cylinders pull the glow plugs and turn the motor over by hand a few times. The rest will just soak thru past the rings without issue.

To the injector bores, Depending on how bad they are I would just use a scotchbrite pad and clean them up lightly.

Some discoloration is normal. "rust" concerns me... How long was this motor "sitting" and have you done a compression check or anything in the mean time?
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Old 12-13-2010, 04:21 PM
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I havnt done a compression or leakdown test on it but I guess I probably should. I dont know how long it was sitting because my grandad brought it home from a guy in indiana and he lost the number to the guy he bought it from. And im not totally sure that it is rust. Its a cruddy brown color with a strong smell of paint thinner or wood stain so id say its probably just varnished up. I will give the scotch brite pad a try as I put new o-rings on the injectors and dont want them to get damaged when I put them into the heads.
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Old 12-13-2010, 04:22 PM
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How do you do a compression check on these motors? I have only ever done it on small gas motors with spark plugs.
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Old 12-13-2010, 04:48 PM
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You need a kit that has a POWERSTROKE glow plug adapter.

Most do not so be prepared.

Remove all the glow plugs, Install your injectors and turn the motor over. You should see about 300-350psi on a motor by turning it over by hand like that.

If you can hook it to a starter somehow 350+ is good.
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