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General Information => Troubleshooting => Topic started by: rabbit_diesel on March 12, 2007, 07:42:32 pm

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 12, 2007, 07:42:32 pm

Is there a special way to adjust the screw on the top of the injector pump without the engine running?  How many turns are they required?

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: jtanguay on March 12, 2007, 08:56:56 pm

the LDA fuel enrichment top?  On some models that have it on top yea pretty sure you can do it.  forget which way is more fuel though... maybe clockwise???

it is turbo right?

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 12, 2007, 09:06:37 pm

I know where the screw is, but I am wandering how far each way to adjust it.  The motor doesn't run right now because I can't get the right amount of fuel to the injectors by guessing.

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: jtanguay on March 12, 2007, 11:05:00 pm

well then you mean the screw pointing to the driver's side? it looks like a bolt that can be adjusted with a flat head screw driver. threading it counter clockwise (in) will increase fueling, while out will decrease fueling. I doubt that would be why the car isnt running though.

did you check the clear plastic lines to see if diesel is actually getting to the pump??? maybe its dry?? you have to remember that these pumps will not prime themselves.

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 13, 2007, 06:09:56 am

It is getting fuel, I have a clear line in.  Would the motor run no matter which way the screw is turned?  Do diesels flood if they get to much fuel?  thanks for the info :lol:

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: jtanguay on March 13, 2007, 09:49:48 am

yea it would be possible to flood a diesel... but you would need to be cranking a whole lot.. (injection pressures of around 1700 psi for N/A i think)

if the screw was turned all the way out, fuel should still reach the injectors, but not a whole lot.  the engine would probably die at idle, but if you held your foot down it should run.  if the screw was all the way in, it would start up, and probably run away and maybe overrev itself!!

if you crank and all you see is black smoke out the tailpipe, then its bad compression.

if you crank and dont hear the motor even attempting to fire, it could be bad/non functional glowplugs.  i noticed that without the gp's the car would crank, but not even catch... (10C weather, worn out compression, but fired with GP's connected)

you can also check the fuel stop solenoid (red wire going to the injection pump) use a multimeter to check for power. while the key is on.

hope that helps

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: burn_your_money on March 13, 2007, 12:26:40 pm

Here's some background info

http://forums.vwvortex.com/zerothread?id=3115724

http://forums.vwvortex.com/zerothread?id=3123290

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 13, 2007, 05:40:49 pm

Thanks for the info, jtanguay!  I really needed that :D.  I will try pullstarting it when screwed out a little more than half and see what happens.  I'll let you know.

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: AdAm84 on March 14, 2007, 07:03:31 pm

make sure you have fuel to the injectors. crack the lines at them while cranking. you should see fuel seeping around threads if you do. diesels need fuel and air. so check for both. thats why i dislike gassers that won't start. lol

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 14, 2007, 07:32:02 pm

Yes, the lines are bled.  I just think it's cranking to slow, so that's why I'm gonna try pull starting it and getting the RPM's up.  I didn't get around to it yet, but when I do... It will have no choice but to start 8).

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: 745 turbogreasel on March 14, 2007, 10:27:23 pm

if your ip timing is 180 out, it will start and run like utter crap.

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 15, 2007, 01:42:22 pm

How far off is 180?  What should it be?

Title: Water sprinkler!
Post by: rabbit_diesel on March 19, 2007, 08:59:29 pm

Well, I got to pull starting it today and it ran horrible :x!  I ran it for a couple of minutes.  Then all of the sudden I saw water viciously spraying out of the coolant cap worse than it was before I even replaced the head gasket.  That's what got me mad.  The head isn't warped either.  It's time for me to rebuild the whole motor.  What do you think the problem is with the coolant deal?  Do those diesel headgaskets require a type of formula do to the very high compression ratio?  I took the head off tonight and noticed that the head gasket was all black and the oval rubber seal was deformed.  When I rebuild it this time what should I do differently?  I'd appreciate any suggestions. thanks

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: burn_your_money on March 20, 2007, 02:12:47 am

get your head pressure tested. The cracks in it may be entering the coolant passages

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 20, 2007, 01:27:41 pm

Well... By looking at the head, the only cracks I can see are the minor ones between the valves.  It had to have been the head gasket because the rubber ring was even blown and deformed.

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: jtanguay on March 20, 2007, 04:43:19 pm

wow that sucks... what did you torque the head to? did you use a known calibrated torque wrench???

Title: How do you adjust the Injector pump on a 1984 jetta diesel?
Post by: rabbit_diesel on March 20, 2007, 07:26:53 pm

I read in the manual that they need to be torqued down to 65 lbs.  Maybe I was wrong.  Is that right for the diesels?