94-03 Injector and Glow Plug Removal And Replacement

 
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  #1  
Old 10-24-2008, 08:34 PM
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Default 94-03 Injector and Glow Plug Removal And Replacement

some of this will look familiar from other threads, but are needed for this how to....

the R&R steps for each one are the same for the most part. 94-98 disregard the intercooler piping removal.

tools needed:

7/16" deepwell for t-bolt clamps on intercooler piping
13mm deep and shallow well sockets
13mm wrench, ratcheting is prefered
wobble
various length extentions
flat head screw driver for the intake tube to the turbo
5/16 shallow well socket for injector bolt
10mm deep well for glow plug removal
3/16 allen wrench
2 pound deal blow hammer
12" pry bar (or ninja grip for injector removal)
Petroleum Jelly (Vaseline)


to start off your engine should look like this


let your motor cool down as your hands will love you long time.....

start off loosening the t-bolt clamps on the intercooler pipes. i only loosened one on each end and left the other one and the boot attached. there will be 2 on the intake / outlet on top of the motor pictured above and one on each side of the radiator pictured here. use the 7/16 socket on these. once loose remove them from the truck. it takes a little wiggling but you can get them out relatively easy.

passenger side

driver side


also take the MAP sensor bracket loose, 3 nuts, with the 7/16 and unplug the harness from it and lay it across on the top of the motor


take loose the intake tube from the airbox to the turbo. there is an adapter in the middle that connects to the valve cover for crank case ventilation. this is held on by the valve cover bolts. take the 2 tubes off each side of it for now. use the flat head screwdriver for this


the motor should then look like this



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Last edited by Benjamin; 10-11-2010 at 02:19 PM.
  #2  
Old 10-24-2008, 08:42 PM
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next is to take the 13mm deep well and remove the 2 nuts on the passenger side valve cover. one holds down a ground and one holds down the oil dip stick. there are also 2 on the driver side holding the crank case vent intake adapter in place. remove these and pull up on the intake adapter thing it should pop out of the tube going into the valve cover.

after this start removing all the valve cover bolts. on the ones that the nut was removed use the deep well, on all others use the shallow well and the wobble and extensions to whatever combination that works well for you. on the passenger side where the A/C box is you might be able to get at those bolts better from through the wheel well with the 7/16 wrench easier than up top with a socket. on the driver side there is a bolt behind the breather extension that has the hose coming out of it. use the wrench there. a socket WON'T fit. after removing all the bolts (10 on each side) remove the valve covers from each side.



in this picture you can see in the middle of the gasket ( in between the 2nd and 3rd injector on that side) is the plug for the harness. unplug it, unplug the main harness from the outside and remove the gasket. BEWARE that the under valve cover harness is clipped to the gasket between the 1st and 2nd injector and between the 3rd and 4th injector. pull this loose and remove the harness. on a 94-98 truck there will be 2 plugs instead of one



do this on both sides. in this picture you can see on the valve spring side of the injector, between the 2 valve springs there is a bolt, 5/16 will remove this bolt.



this is the only bolt you need to remove to get the injector out. the "bracket" that that bolt holds down will then slide up, towards the electronic connection, and will slip out from underneath the front bolt. then use the pry bar or ninja grip to pull the injector out. the only thing holding it in is the o-rings. when you pull it out look into the hole and make sure that no o-rings are left in there and the copper washer is still around the injector tip. don't worry about any fuel and oil that runs into the Cyl. i will address that later.

after all 8 are removed take the oil deflector off the old ones with the 3/16 allen wrench.


install on the new ones and tighten the crap out of them. also place the bracket on the injector where this deflector will line up with the discharge hole in the injector.




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Last edited by Benjamin; 10-11-2010 at 02:19 PM.
  #3  
Old 10-24-2008, 09:06 PM
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when looking at the injector in the head, at the top right corner there is a white wire that was removed when the harness was unplugged. this is for the glow plugs. remove the glow plugs using the 10mm deepwell. remove all 8.

next is to prep the new injectors for installation. i used petroleum jelly found at walmart or any other store that sells health products. lube up all 3 o-rings on the new injectors, also remove the new copper gasket at the tip and put a little petroleum jelly behind the gasket and stick it back to the tip, this will keep the washer from falling off during installation.



after lubing them up slide it back in the hole for the injector. slide the bracket that goes over the bolt up and tap the injector in the hole with a rubber mallet or a dead blow. mine was a cheap 2 pound plastic dead blow. NEVER use a metal or hard hammer as it may damage the electronics. you will hear when the injector bottoms out when tapping on it. after it is down re-install the 5/16 bolt that holds it in place. snug it up good as i don't know the actual tq spec. do this on all 8.

next is to put put the valve covers back on and only put 2-3 bolts to temporarily seal them down.

then BUMP, don't crank, bump the motor over 15-20 times. what this does is slowly pushes the oil and fuel out the glow plug holes and contains everything under the valve cover. after you are sure the motor has made 2-3 complete revolutions. this can also be done by turning the crank over by hand using a socket.

after this is done remove the valve covers and reinstall the glowplugs and the under valve cover harness, plug in the injectors and glow plugs.

at this time i would change the oil and filter. pour the new oil through the head where the injectors are.

the next thing to do is fire the truck up. i did mine with the valve covers off to look and make sure that all the injectors were firing. if you don't want the valve covers off you can put them back on but it is easier to hear the injectors fire with them off.

first thing is to kick the key on a few times and let the fuel system prime up. then crank the motor for 30 seconds or so. the truck isn't going to crank. let the starter cool down for 2-3 minutes. then crank again. a booster charger would be a good idea to keep the batteries from draining and going dead. after about 6-10 cranking sessions the HPOP should be primed and the truck should start to fire. it will start rough and you will have to help keep it running. after it runs a few minutes the idle should be smooth. shut the truck off, and re-assemble the valve covers, the intake tube, and the intercooler pipes, plug back in the MAP sensor, mount it back on the A/C box and it all is done. the first few times you crank the truck after injector installation it may crank a little longer than normal. this is normal as the HPOP may still have a few air pockets left. after i drove mine a mile or so down the road and came back home mine cranked right up.

i hope i didn't miss anything. if anyone needs any help PM me or ask here.


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Last edited by Benjamin; 10-11-2010 at 02:19 PM.
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Old 10-24-2008, 10:59 PM
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pretty simple, good right up.
 
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Old 10-25-2008, 10:43 AM
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Well Done BJ
 
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Old 04-18-2009, 10:21 PM
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I am looking at replacing my stock injectors with Swamps 175/146 Stage 1 soon
is this procedure easy for a novice? I do have some friends that are willing to help/more mechanical than me.
going to install new glow plugs as well
 
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Old 08-22-2009, 08:10 PM
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nice write up ben
 
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Old 08-22-2009, 11:17 PM
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Nice write up. I'll do a 6.0 one, next time I have one apart.

Step 1 - get out every tool you own, and throw it on the workbench.
 
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Old 08-22-2009, 11:20 PM
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about the rails, i saw that in a diesel mag they swapped them out one at a time and bumped the engine over after each injector swap to save time and not have to prime anything?
 
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Old 04-04-2010, 02:44 PM
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No you do not have to removel injectors to change glow plugs i just did mine yesterday.
 



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