Sticking/leaking intake valve - Ford Powerstroke Diesel Forum
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Old 03-10-2013, 06:17 PM
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Sticking/leaking intake valve

I just finished putting together a basket case job on a 07 F-350 that needed a cam. I have an intake valve that is leaking (I am getting a light popping out the intake, I dont have the intercooler hooked up) The strange thing is the popping noise has come and gone a couple of times, now it is doing it all the time. Has anybody had any issues with valve sting partially open or any other issues? I did a leak down test and it is not a major leak but it is enough that I can hear it in the intake. Any suggetions?
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Old 03-10-2013, 06:20 PM
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suspect a bent pushrod. is it flagging any cylinders for contribution?
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Old 03-10-2013, 06:21 PM
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Which cylinder? My guess is a bent push rod on number 5. Any takers???
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Old 03-11-2013, 03:55 AM
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Cylinder #3. I will check the pushrod, I did not suspect a bent pushrod because the problem went away and then came back 2 different times. Also it is only leaking about 18% so it is not a "major" leak. I will pull the pushrod tonight and check it.
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Old 03-11-2013, 04:19 PM
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I pulled the pushrod today, it is straight. So I decided to pull the intake and take a look at the valvestem. It has quite a bit of junk on it and I think it is making it stick partially open. I soaked it with pb blaster and will let it set for a couple of days and see what happens. I really don't want to pull that head back off.
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Old 03-11-2013, 07:14 PM
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Quote:
Originally Posted by Tuscany View Post
Which cylinder? My guess is a bent push rod on number 5. Any takers???
Does anybody know why cyl5 push rods bend. I have done over 100 of these head gasket jobs and never bent a rod. Why do they bend and why is cyl 5 the culprit?
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Old 03-12-2013, 05:27 PM
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It's not always #5, it just seems like that is somewhat common.

I changed four bad #5 injectors in a row over this winter, NOT including my own which was terrible. Does that mean anything? no, it just means things happen coincidentally.

I've never bent a pushrod either but my guess is it may have something to do with a valve that gets stuck in the guide. I always bar the engine over atleast a dozen full times after I'm done putting the heads on just to make sure everything is seated and looks good. I also do like the book says and put the dowel on the crank at 6 o'clock before I start and after I'm done.
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