While doing some head gaskets and an injector on a customer's vehicle, I decided to show you guys how injectors are replaced on these trucks.
First step is to figure out which one it is. This may involve a dealer visit, or some other diagnostic source. Once you know which one it is, get to it. I'm replacing #3.
Clear off the valve cover: remove CAC tube
Remove wiring to glow plug control module and ICP sensor
Now go ahead and take off the valve cover. A few of the bolts will be difficult because of the evaproator case.
Now take out the standpipe
It might be short or long.
If it's short, then it separated like it was supposed to. If it's long, you will probably have to separate it. The two halves just pull apart from each other. Insert the lower part back into the branch tube once the oil rail is out.
Now take out the oil rail bolts and
pry up gently.
Hold the oil rail over the cylinder head so it can drain back into the crankcase.
Draining the oil rail
Take a 19mm socket and place it over the injector connector. Press it down firmly to disengage the inector connector lock tabs and allow the injector connector to be pulled back into the head
like this.
Take out the inector hold down clamp bolt
The injector and clamp will rise out of the injector bore as the bolt is loosened.
Check for damaged o-rings and copper combustion seal
The combustion seal is on the bottom of the injector
Lube up a new injector with clean oil, fit the old hold down clamp onto it, and install. Lube the injector connector o-ring with oil and press it into the hole in the head until it clicks - watch your orientation; make it match the other injector connectors.
Pour a small amount of oil onto the top of the new injector prior to installing the oil rail.
Put it all back together. Don't be surprised if the engine spins over for a while before firing up - there is now a lot of air in the high pressure system to compress. The air will purge after some sprited driving.
Tip one up for me!
I'm outa here!
