What caused this?
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Freshman User
Joined: Sep 2012
Posts: 43
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From: San Marcos California
What caused this?
Short story is the truck was running well but I started to hear what sounded like an exhaust manifold leak or a blown head gasket. As I started to accelerate to merge with another freeway it stumbled and sounded like the engine was ready to spit out some parts. I shut it down and towed it home. The computer said number 4 cyl had a contribution balance problem. So I pulled the number four injector and it looks like this. It has only been the engine for a few weeks but was used when installed. It did not have any discoloration when I installed it with new seals and torqued it to 28 ft lbs.
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Freshman User
Joined: Sep 2012
Posts: 43
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From: San Marcos California
thanks
I did clean out the hole and cup on install. The copper washer shows no sign of any leakage. It is clean and shiny all around. Is there any other place for compression to enter the area below the fuel o-ring? A cracked head maybe?
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Freshman User
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From: San Marcos California
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Logistics Pro
Joined: Dec 2004
Posts: 4,138
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From: South Weber, Utah
The only other thing i could think would be a crack in the injector cup? can you take a photo of the end of the injector.
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Freshman User
Joined: Sep 2012
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From: San Marcos California
The washers look good to me. Sorry for the black and white. My camera does not like close ups and that helped. I did not pull the washer and look below but the top shows no sign of any leakage. Can it come through the injector itself or is a cracked cup the only place for compression to get inside the cup? Going back to the noise it made like a blown gasket could that be related to the compression in the cup?
Hotshot
Joined: Apr 2010
Posts: 19,072
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From: Saratoga Springs,UT
Last time mine was out I went 26ft/lbs on the Holdown
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 243
From: Saratoga Springs,UT
If inject cup was cracked you would have Diesel Fuel in the Coolant But the Injector wouldnrt be Burned
Are you shure there isnt another Copper washer in the Inject cup
Was there 2 copper washers in there
Maybe that inject didnt get torqed all the way IDK
But Replace the Holdown this time maybe its Bad IDK
Did the previous inject look like this???????????
Are you shure there isnt another Copper washer in the Inject cup
Was there 2 copper washers in there
Maybe that inject didnt get torqed all the way IDK
But Replace the Holdown this time maybe its Bad IDK
Did the previous inject look like this???????????
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Freshman User
Joined: Sep 2012
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From: San Marcos California
Thanks to all
The old injector did not look like this one at all. Minor discoloration only. The stuff on this injector was thick like it had been getting contaminated from the install. I will check the cup to make sure there is not a second seal within. All the injectors replaced had seals attached but you never know if you don't look. I will clean everything thoroughly including the bolt hole and reassemble with new seals and a new hold down see and what happens. Is there a way to run a compression check at this stage. Someone must make an adapter that goes in where the injector does.