Extended crank after replacing head - Ford Powerstroke Diesel Forum
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Old 08-23-2010, 07:24 PM
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Talking Extended crank after replacing head

Hey every one new to the site and have a question to ask. I just recently got a 95 f350 that's pretty frogged up but got it for a pretty good price? Well any way I just replaced one of the cylinder heads because the old one had a hole in it due to I believe a bad casting. But prior to replacing the head the thing would pretty much fire rite up but now I have to crank the heck out of it befor it will fire up. I put a fuel gauge in it and it is leaking down but It will fire up on 15psi and goes up to around 45psi pretty quick. But when I shut my monster off and let it set for a minute crank crank crank hello dolly. From what I've read it seems that I have a high psi oil problem in the injector bank on the head I replaced? You guys are probly going to want to slap me silly when I tell you I didn't replace the o rings on the injectors but thea looked good to me and mr dealer wanted 35$ per injector for the kits and needless to say myass is on a budget. Realy that's the only thing I half arsed but the fuel psi did have concerned and do you guys know what psi the hp oil pump operates at and what is an exceptible oil psi leak down on the injectors. Please note the head came off of a 1997 my truck is a1995 and all I did was pull a few of the valves out to look at them and They looked about the same as what was in it so I let her eat new head gasket heads torqued to factorie specks glow plugs ohm at around 5k like I said it ran befor I ( fixed it ) . I guess what I'm really asking is do you guys think I should pull the injectors and put o ring kits on them or what do you think I should check. Any help would be appreciated I wanna roll some coal!!!
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Old 08-23-2010, 08:01 PM
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For future reference, the same injector o-ring kits are half the price at an international dealer.

Overall, you will need to crank the engine 5-10 minutes to get the air out of the fuel and oil rails in the head. Crank it 20-30 seconds, wait a few minutes, repeat. Glow plugs should have a resistance of about 2 ohms or less.
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Old 08-23-2010, 08:37 PM
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I did have it running for a while but not long have not installed the radiator yet. But air is definitely a possibility can't crack no lines on this one I will through the rad in it and run it this is my first power stroke and thinking about it their is a lot of room in that head for air. Thanks
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Old 08-23-2010, 09:04 PM
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Once it's all together and you have no leaks, drive around until it's at normal temperature, then take it for a good highway/freeway rip. That'll purge any remaining trapped air.
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Old 08-24-2010, 03:08 AM
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I will give that a shot thanks.
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Old 08-24-2010, 06:40 AM
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x2, a LOT of cranking. and most report that 50 to 60 miles does the trick for gettin air out of the HPO system.
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Old 08-24-2010, 02:04 PM
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Thanks will do got to get my trans straight first believe my forward clutch assembly is shot again thanks for the feedback
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Old 09-03-2010, 09:26 AM
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Mine took about two weeks of driving before it went back to its normal crank time after I replaced the head. Now on a warm day it starts as soon as you turn the key.
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Old 09-08-2010, 02:58 AM
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10-4 on that haven't really had time to get back to it yet ordered a radiator for it and found out that my 95 has a 94 radiator in it so once I get that I should be able to put some time on it. Thanks for the input.
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