Oh, and did you replace the primary & secondary fuel filters?
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Everything new, still wouldn't start on it's own - SOLVED!
- Thread starter Av3fire
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Av3fire
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yes, have good stream from the secondary filter to the HH (has been converted to spin-on filters so only 2 located on side of engine)
Av3fire
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NO, but i did replace it when i had it apart..... installed new clamps as well (it did not have any when i took it out)
Av3fire
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Yes, just converted to spin ons with all new fuel lines too
Anyone ever work on the injector pump or injectors?
Av3fire
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before a month ago, i cannot say..... i did replace the injectors recently
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Could be the HH going bad, had one do the same would run once you got it going but wouldn't build enough pressure while simply cranking it.
Have you tried running the intank pump for a minute before cranking? If it solves the problem, could be an air leak somewhere letting it loose prime.
Also, if you give it any throttle while cranking, will it start?
Did it have the same trouble prior to the new injectors?
Have you tried running the intank pump for a minute before cranking? If it solves the problem, could be an air leak somewhere letting it loose prime.
Also, if you give it any throttle while cranking, will it start?
Did it have the same trouble prior to the new injectors?
Av3fire
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I have not tried letting the pump run for a bit, but will tomorrow
i have the pull throttle set at to about 1500 rpms to start it.... was told by the seller that is how you start it......
yes, had same problem before injectors and all of the work i have done...... i have been chasing ideas from here and other posts
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Without being overly nosy - why did you replace the injectors?
And possibly the pedigree on those injectors - where they came from?
Av3fire
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they were NOS and because it was suggested (among many other things that have also been replaced) that they might be the problem
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Unless letting the pump run a min lets it fire right up without having to touch the throttle,, I'd bet money it is a failing HH. I've changed over a dozen over the years, you are having all the common symptoms, after eliminating all the other possible causes.
You should be able to not touch anything and it fire up and idle at 750ish rpm. My last truck would start before I could squeeze the last air molecules out from between my finger and the button. Should have never sold it.
davidb56
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I got a 1989 F450 7.3 that has been like that for 10 years now. Just give it a squirt of juice and off it goes. BTW my JD 4020 tractor manual states that you need to use ether in colder weather below 60F, and has a system similar to some of the deuce's with the screw in bottle and button.
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I'm familiar with other 7.3 like yours. He won't get 10 months out of the head if it is already this bad. And either is very hard on these real high compression engines. Sounds like it was failing on the previous owner, and who knows how long he ran it that way already.
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Just for my own information..what exactly fails on a HH beside possible cracks in the head itself? Seems like most could be cleaned up without having to replace them.
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You might check compression, or have a shop test it for you.
A bit off, and they are hard to start. Even a newly rebuilt engine may not have the rings set in yet, and be hard to get going.
DG
A bit off, and they are hard to start. Even a newly rebuilt engine may not have the rings set in yet, and be hard to get going.
DG
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Yep, the second most important part. Hose must be for "immersed in fuel" use.
Otherwise it will entrain air.
My other thought was that You did many things at the same time. Question is did you save the "old" injectors?
Is the "new" injectors pop tested, do you have the numbers? Are the "new injectors the two hole type?
You could just put three of the old ones into #1, 3,+ 6 holes and try it. It is NOT a huge mess to pull any one of them and re-attach it to system and run it to a bucket and crank her. It is NOT a lot of fuel when cranking.
It is injectors or weak hydraulic head?
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The hydraulic head sleeve and rotating element is a very close fitting rotating part. The fuel filters are there to protect it. It is so finely hand lapped to be a perfect fit and crap in the fuel wears it fast. Think 5 micron clearance,
5 microns is 0.00019685inches.
The flow benches that were used to test the mechanism are all long gone.
What was the fuel the last owners were using in Her?
Study the hydraulic head.
There has been more than many threads here in Steel Soldiers about the HH.
post #81 in here
5 microns is 0.00019685inches.
The flow benches that were used to test the mechanism are all long gone.
What was the fuel the last owners were using in Her?
Study the hydraulic head.
There has been more than many threads here in Steel Soldiers about the HH.
post #81 in here
65 Kaiser M35A2 project starts
I believe it’s the hydraulic head. I’ve read the tolerances are so tight that if you hold the quill shaft in your fist for 10 seconds it shouldn’t even fit back into the head. Mine did with almost no hesitation and I clearly remember seeing swirl wear marks on the quill shaft. I will confirm...
www.steelsoldiers.com
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Av3fire
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had the same symptoms with the old injectors, this is why it was suggested to replace them.... cheaper first step than a HH
I am now beginning to think HH
the PO ran all kinds of crap in the fuel, 2" of sludge in the fuel filters bowls kind of crap
i'll look into replaceing the HH
Av3fire
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I am thinking this too now
the PO ran all kinds of shit in the fuel
like 2"+ of sludge in the bottom of the fuel filters bowls
what do you guys think about getting a new HH?
are the aftermarket ones OK to use?
does it have to be an original one?
these seem hard to find and expensive (from a quick google search)
are they hard to replace? (I know the timing is super important, and i have never pulled one off...... afraid of turning the truck into a 9 ton lawn ornament!
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If you find for sale an original HH then Please let us all know where you got it.
see in a popular auction site
Hydraulic Head Injection Pump M35A2 2.5 ton Bosch PSB-6A
I had bought one as a spare and never needed it so sold it for like $200. I don't know if they be good or not.
Anyhow I put a 3 micron filter on Mine as never wanted to change all the other filters again and I wanted a clean tank and had a functioning perfect HH which I did not want to harm. I ran 90% NEW motor oil in Her and she liked it.
see in a popular auction site
Hydraulic Head Injection Pump M35A2 2.5 ton Bosch PSB-6A
I had bought one as a spare and never needed it so sold it for like $200. I don't know if they be good or not.
Anyhow I put a 3 micron filter on Mine as never wanted to change all the other filters again and I wanted a clean tank and had a functioning perfect HH which I did not want to harm. I ran 90% NEW motor oil in Her and she liked it.
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