Another 7.3 no start..

[littleredstroker]

I guess pull all that crap off so you can remove the valve covers then. I just pictured it being easy to pop the lines off without having to remove anything else and wire them up.

and it would be, I have next weekend off for the second time in13 weeks, and am wanting to swap my 67.7 in so regardless most of this is coming off. I do appreciate the help.

Is there anything else pre injector that can leak other than the check valve ?

 

[2000wa250]

Any ports in the rails, but would be incredibly obvious. Same with hpop res and mounting gaskets.

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[ghohouston]

I believe the lpop itself could be cracked or front cover could be damaged

 

[TyCorr]

I believe the lpop itself could be cracked or front cover could be damaged

Yea. Wouldnt it leak also? Im the first to admit, ive only had two front covers off and I didnt investigate much after that.

 

[ghohouston]

I don't see a direct correlation to leaking, externally where you could see it that is. I've read about front covers getting scored by the lpop, which I have seen in 6.0's but never in a 7.3. Basically, my understanding is the lpop wears into the cover, and creates enough gap in there to let the oil leak back to the pan, thus, wil not hold its "prime" like it should.

 

[littleredstroker]

I don't see a direct correlation to leaking, externally where you could see it that is. I've read about front covers getting scored by the lpop, which I have seen in 6.0's but never in a 7.3. Basically, my understanding is the lpop wears into the cover, and creates enough gap in there to let the oil leak back to the pan, thus, wil not hold its "prime" like it should.

And then its time for a new FC?...

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[ghohouston]

Indeed

 

[littleredstroker]

Ok. Disconnected passenger side head, tied line up, it didnt drain. Hooked back up, it started to drain..

Now, pulled vc, took fill plug out of resivior, used air hose and pressurized it, I could hear/ see oil coming out of 4 and 6, pulled all 4 injectors. On 6 the top rubber was split.. the confusion is that it wasnt the o ring itself, just the rubber cushon between the o ring a metal ring . Could that cause the leak? The other 3 were almost to the point of splitting, but still intact

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[littleredstroker]

UPDATE:, new injector o rings doesn't seem to be draining anymore.. but now when start it it cranks and cranks and cranks, IP slowly raises along with DC over about 10 seconds time and then it kinda "rolls" an idle almost like starting it after its out of oil.. but res is full, HPOP makes 3100 @43% so I don't think that's a issue. idk

EDIT: also , the longer it sits the longer it cranks before starting. if I shut it off it starts right back up, if I shut it off and wait 30 seconds it cranks for 6-7 seconds, sit overnight it cranks for 20-25 seconds

 

[littleredstroker]

Went to start it after about two hours, no start, after about 20 seconds of cranking you can hear it try and pick up only building 300 psi or so.. res is full so something is def running out of oil. . Just not sure what

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[littleredstroker]

Changed ipr and it starts now. Not completely sold thats what it is...

Man this place is quiet

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[TyCorr]

So it takes excessive cranking and then it doesn't " pop" off hard...its not lik rrrrrrrrrr-ROOOOMP? But rather it cranks excessively then kinda prematurely ejaculates and when you let off the key it just kinda is idling? In other words, it doesnt pop off and settle into the idle? The whole dramatic hardness is gone?

Sorry for being so damn extensive in explanantion but what youre describing is air in the hpo system. Injectors not seated and air is entering, an injector is puking hpo (which would explain inability to build hpo, and mushy idle). You most likely have an injector or two that is worn.

 

[TyCorr]

Changed ipr and it starts now. Not completely sold thats what it is...

Man this place is quiet

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One other thing, is the idle #whispers# soft? Misfire?

 

[littleredstroker]

this thing is driving me crazy.... oil res will randomly be empty, I check it before every trip. it will be fine for a couple of days, then it will be empty after 2 hours of sitting . and the no starts are also completely random... let it sit overnight, starts right up. Sometimes it will fire right back up, sometimes it will crank for 10 seconds now it wont build over 200 psi.

If an internal injector o ring was toast you would think it would no start all the time, not just randomly not start, same thing with oil pump...

at this point my main concern is figuring out WTF is leaking not so much the draining res.

 

[2000wa250]

Sounds exactly how my acted when I had upper oil o rings that were starting to go. At the right temp it would leak down within about 45 mins. Cold enough and it wouldn't leak down at all and would work, but randomly it would not start. Or extended cranks, or start fast as ever.

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[littleredstroker]

upper o rings on the inside of the injector ?

 

[2000wa250]

No...on the injector body.

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[TARM]

OK hang on a e one.

When hyou replaced the orange you did reply ALL of them both heads correct? If no start there. 4 out of 6 equals replace all of them.

I also always replace the copper crush washers as well they are cheap and take one second to do. Did you put a straight edge across the tops to ensure all are even and none are not fully seated?

If you have done once again let's narrow down where the help resolve drainback is happening from:

Pull both help lines and see. Do it a couple nights as you said it happened sporadically this last time. If that goes on reconnect but this time disconnect from the help rails and have them over the top of the res. See if it drains. This way will will know if it's a leak in the heads/injectors or the block/front cover/hpop itself side of things.

It honestly looks as though you have had a few issues that all contribute to this.

It is clear you had bad orings and if you did all of them and confirmed they were all seated that side should be GTG.

I see you said you checked the check valve I the head. I assume that checked out.

I think you also swapped hpop as well? If so that basically leaves you with a worn loop or its front cover mounting surface. It's really not that bad of a install/breakdown. Pull the loop and look carefully at the front cover mounting surface for any wear or galling. If it's good it's likely just the pump. Look up my post on purchasing the melling from advanced auto. You can get it for around $50 if you do it thru o line with coupon but choose in store pickup at your local store.

When you install it grease it so it gets good prime from the start.

 

[littleredstroker]

when I disconnected the passenger side hpop line it did not drain, so I only replaced o rings on that side. all injectors are flat acros, fully seated, crush washers are new,

what do you mean 4 out of 6 equals replace them all?

 

[ghohouston]

He means at that point, you might as well just replace all the o rings.