HYDROLOCK
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Trailering
Joined: Jul 2025
Posts: 21
Likes: 6
HYDROLOCK
F### ME!!! I had a hot no start show up about 2 weeks ago. pin pointed the issue to a top seal on injector #4 blown aswell as the oil rail seal. Replaced all 8 injectors seals. Did a clean thorough job. I replaced the o rings on both oil rails aswell as the nipples. Got it started up, it ran phenomenal, super smooth idle. injection pressure stayed within 3 psi at idle didnt shake or anything, let it warm up and took it down the road, it pulled like it never had before loads of power even at 1/4 throttle which is all i gave it trying to be easy on the new seals. made it for maybe 2 miles and then all the sudden truck lost power and started knocking extremely loud. started absolutely BILLOWING white smoke. so much to the point i pulled over because i couldnt see or breathe. it smelled awfully of diesel. engine hydrolocked when i shut it off. drained oil has no metal or shiny in it. throwing codes for glow plug circuits only. What are your guys thoughts, damaged injector tip? what am i looking at for replacing
Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
Agreed - a problem with torquing down an injector(s) is likely.
Now you need to remove the glow plugs and rotate by hand to identify, and then clear, the "offending" cylinder.
Once identified, then the injector needs (at a minimum) to be rebuilt and carefully re-installed, We can help with a few details and cautions when you get to that point.
Let us know what you find.
Now you need to remove the glow plugs and rotate by hand to identify, and then clear, the "offending" cylinder.
Once identified, then the injector needs (at a minimum) to be rebuilt and carefully re-installed, We can help with a few details and cautions when you get to that point.
Let us know what you find.
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
F### ME!!! I had a hot no start show up about 2 weeks ago. pin pointed the issue to a top seal on injector #4 blown aswell as the oil rail seal. Replaced all 8 injectors seals. Did a clean thorough job. I replaced the o rings on both oil rails aswell as the nipples. Got it started up, it ran phenomenal, super smooth idle. injection pressure stayed within 3 psi at idle didnt shake or anything, let it warm up and took it down the road, it pulled like it never had before loads of power even at 1/4 throttle which is all i gave it trying to be easy on the new seals. made it for maybe 2 miles and then all the sudden truck lost power and started knocking extremely loud. started absolutely BILLOWING white smoke. so much to the point i pulled over because i couldnt see or breathe. it smelled awfully of diesel. engine hydrolocked when i shut it off. drained oil has no metal or shiny in it. throwing codes for glow plug circuits only. What are your guys thoughts, damaged injector tip? what am i looking at for replacing
don't forget to check the injector seat sleeve in the head for damage
Logistics Pro
Joined: May 2004
Posts: 3,605
Likes: 865
Great video Hartwig.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Thread Starter
|
Trailering
Joined: Jul 2025
Posts: 21
Likes: 6
Great video Hartwig.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
hello! today i pulled all 8 glow plugs, cranked it and injector 6 is blowing fuel out of the glow plug hole. gonna pull it tomorrow and replace, everything i used was from Alliant.
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Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
When you crank it with removed glow plugs, take care of your eyes!! You can see the lose injectors ( injector hold down clamp bolt hole not blown out with shop air)
https://youtu.be/XTYZ4jmm91U?si=jc8NM9Ve5PI4syMZ
don't forget to check the injector seat sleeve in the head for damage
https://youtu.be/XTYZ4jmm91U?si=jc8NM9Ve5PI4syMZ
don't forget to check the injector seat sleeve in the head for damage
Great post Hartwig.
Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
Great video Hartwig.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
Great video Hartwig.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Sometimes I hate this HEUI system for that reason alone.
What do you think caused it:
-Bad installation?
Over-tourqued?
Faulty o-ring?
I'd be curious to know where the OP got the replacement parts.
I've only installed injectors once, I am sure you've lost count how many you've installed. I was almost surgical with this part because I did not want this to happen to me.
Thread Starter
|
Trailering
Joined: Jul 2025
Posts: 21
Likes: 6
It is always an installation issue. The oil in the threaded hole means that the injector is not firmly fixed. As a result, it “bounces” up and down and the o-rings and the copper washer are destroyed. Sometimes immediately after starting the engine, sometimes only after several hundred miles - depending on how much the injector can move.
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
If the injector has only been running for a short time until the hydrolock, there is a high probability that the internal components have not been damaged. For me personally, the risk would be too great in view of the damage that a not 100% functioning injector can cause.
I always replace the injectors and take a very close look at the sleeves in the head.
I always change both filters when installing new injectors and prime the systems (fuel an oil side) before let the engine fire up.
And not to forget, I change the oil + filter BEFORE I change injectors.
I always replace the injectors and take a very close look at the sleeves in the head.
I always change both filters when installing new injectors and prime the systems (fuel an oil side) before let the engine fire up.
And not to forget, I change the oil + filter BEFORE I change injectors.
Logistics Pro
Joined: May 2004
Posts: 3,605
Likes: 865
willyt54,
Do yourself a favor and listen to this man.
We had a few members years ago that were techs (m-chan68, cheezit and obviously Ron) and they gave great advice. They've since moved on and @Hartwig has since taken their place as the go to tech guy IMO.
Thank you Hartwig for being such a valued advice fallback tech.
Joe
Do yourself a favor and listen to this man.
We had a few members years ago that were techs (m-chan68, cheezit and obviously Ron) and they gave great advice. They've since moved on and @Hartwig has since taken their place as the go to tech guy IMO.
Thank you Hartwig for being such a valued advice fallback tech.
Joe