lcf tsb's for hard start long crank hot

[robp823]

i had an lcf with long start hard crank only when hot found 2 tsbs one was for changing the oil plugs and stand pipes and the other for the stc fitting and branch tubes when replaced the oil plugs and stand pipes found oil plug o-rings had deteriorated and were ready to crack.replaced them and did not fix problem so now that i have taken the trans out and rockers to gain access to and replace stc fitting and branch tube what am i looking for as failiure??? slop in stc fitting??? hole in branch tubes???? any help would be appreciated thanks

[mchan68]

Although I haven't personally wrenched on any LCFs for this particular issue, I believe it is very similar to the setup used on 6.0L engines. If it were me, I would've commanded IPR to 100% (or closest to), and then air tested the high pressure oil system first to isolate the leak before disassembling anything, least of all pulling the transmission like you already have. STC fittings typically blow out, causing ICP system leaks. MOST of the time, branch tube replacement is not necessary. THe update fitting is a one-piece design that eliminates the STC fitting altogether, eliminating it as a possible leak source. Usually if the branch tube requires replacement, there would be engine rear cover damage as well. Out of the hundreds of STC fitting replacements I've done, I've only ever had to replace two branch tubes. /forums/images/%%GRAEMLIN_URL%%/2cents.gif

[robp823]

did air pressure test i heard no leaks although you cannot use output state control on these engines to command ipr they dont use ids they use a diffrent software called md truck launch pad

[mchan68]

did air pressure test i heard no leaks although you cannot use output state control on these engines to command ipr they dont use ids they use a diffrent software called md truck launch pad

How was this air test carried out? Did you supply 12 volts directly to the IPR valve?

[robp823]

no didnt know you could ill try that do you supply battery voltage and ground right to the battery and that will open it?

[Keith Browning]

No, that will close the valve. many of us have taken a connector either from a salvaged harness or a repair pigtail and added a length of wire to it. Put a couple cheap alligator clips on the ends and you can fully energize an IPR on any 4.5L & 6.0L engine.

 

My experience has shown that the 4.5L likes to eat up the o-rings on the oil rail block off tubes and the stand pipes more than the STC fittings blow apart. For some reason thy just disintegrate. If you access the oil rails I recommend removing all of the plugs on the rail to inspect them even though you can remove the block offs and the sand pipes without removing them. It only takes a few minutes and it can save you from getting bitten in the ass. It has happened in my shop several times - myself included.

 

Unfortunately the Master Diagnostic software leaves a lot to be desired in comparison to the Ford IDS. Remember that the LCF does not use a Ford PCM. It uses a Navistar diamond logic module and requires their diagnostic software. You will also discover that many PIDS are not available and you need to use the jumper harnesses to diagnose several items on the engine using your DVOM. If you are a certified medium duty dealer you should have the kit containing 3 or 4 of the jumper harnesses.

 

From my experience I will bet you have bad do-rings on the block off and/or the stand pipe tubes.

 

Go on, jump in! The water is warm. /forums/images/%%GRAEMLIN_URL%%/smirk2.gif

[Alex Bruene]

I'd agree with the d-rings as well. If you think 6.0s are bad for eating them up, well, the 4.5 is even hungrier. And, keep in mind that after repair, it will take much longer to get the air out of the system, since the oil manifolds are massive compared to the 6.0 manifolds. So, you may think it's not fixed, when in fact the leak has been repaired. Also, don't forget to check the plug on the left oil manifold that blocks the hole where the ICP sensor would fit if it were on the right bank. They are VERY common to come loose and leak. If you have some left over plugs from the 6.0 STC kit, they are the same.

[robp823]

already replaced the oil rail block off plugs and stand pipes before going to the stc but thanks for the info on energizing the IPR will def make up somthing so i can do it in the future