2.5 NAD pump adjustments - Defender Source
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  #1  
Old September 13th, 2009, 09:52 PM
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2.5 NAD pump adjustments

Now that my 1984 90 is here in Colorado I notice that it has significantly more black smoke and less power than when I was driving it at sea level.

According to my manual the 2.5 NAD CAV pump needs adjusted when there is a change in altitude but I am unable to find directions on adjusting the pump. The manual simply states that adjustments should be done by an authorized CAV service center. Doubt there is one around here

My 90 was at sea level so I assume it was adjusted for sea level and I am currently living at aprox 6,000 ft

The manual states

For each 1000 ft above 3000 ft the fuel delivery should be reduced by 3%

So I should reduce the fuel delivery by 9%

Question is how do I do this? How do I tell the percentage I am adjusting it?
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  #2  
Old September 15th, 2009, 09:17 AM
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  #3  
Old September 15th, 2009, 10:27 AM
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It is the screw facing the engine (between the pump and the engine) that is the main fueling adjuster. Power will drop, though as you reduce fueling.

These engines are dogs at altitude.......
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  #4  
Old September 15th, 2009, 02:15 PM
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I will look when I get home tonight, any idea what way I turn it to reduce the fuel?

As for power, I would think that too much fuel would result in incomplete combustion and as a result reduced power as you are not able to get the proper air / fuel mixture and extract the energy from the explosion properly.

atleast that is true for petrol, not sure about diesel
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  #5  
Old September 15th, 2009, 02:27 PM
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I believe the adjuster screw is sitting in the corner. It has a round thing on a side and is about three feet long. I believe it says tdi on it somewhere.

Seriously, I will ask Tom B when I see him tonight. He knows all about the 2.5 n/a motors.
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  #6  
Old September 15th, 2009, 02:34 PM
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Quote:
Originally Posted by dave_lucas
I will look when I get home tonight, any idea what way I turn it to reduce the fuel?

As for power, I would think that too much fuel would result in incomplete combustion and as a result reduced power as you are not able to get the proper air / fuel mixture and extract the energy from the explosion properly.

atleast that is true for petrol, not sure about diesel
No, more fuel equals more power. At some point, the increase stops, but you need to be into the smoky zone...

Diesel does not "explode" like petrol. It burns at the rate of the cylinder movement.

Your dreams of more power are lost..... You can get better mileage though.

I live at 4000 ft and drive to 7000 ft. The 2.5 NAs are horrid at 7000 feet. The are liveable at sea level...
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Old September 15th, 2009, 03:12 PM
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How odd, you would think at some point too much fuel would lower power output but what do I know

Not doing it for power or mileage, would like to cut down on the smoke some as I leave a nice black cloud behind me on hills and I am getting ready to take it into the emissions station for testing.

When I want more power I will slap the 200 in there

Quote:
Originally Posted by Red90
No, more fuel equals more power. At some point, the increase stops, but you need to be into the smoky zone...

Diesel does not "explode" like petrol. It burns at the rate of the cylinder movement.

Your dreams of more power are lost..... You can get better mileage though.

I live at 4000 ft and drive to 7000 ft. The 2.5 NAs are horrid at 7000 feet. The are liveable at sea level...
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  #8  
Old September 15th, 2009, 03:15 PM
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Quote:
Originally Posted by dave_lucas
Not doing it for power or mileage, would like to cut down on the smoke some as I leave a nice black cloud behind me on hills and I am getting ready to take it into the emissions station for testing.
Raise foot on throttle. It does the same thing. The throttle is mostly a fueling rate controller.
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  #9  
Old September 21st, 2009, 09:19 PM
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I took a picture of the pump today, maybe that will help as I am still unable to find the adjustment.
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  #10  
Old September 21st, 2009, 10:33 PM
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I believe they are similar to pumps put on many american tractors. Believe it or not they put them on John Deere's and (I think) even a version was on the 6.2 GM N/A diesels

I had one on a Ford tractor long long ago.. Never adjusted it though.

Call the the local John Deere guys and ask for a manual for a CAV/Lucas/Deere pump.
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  #11  
Old September 21st, 2009, 10:55 PM
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I found a manual for a CAV DPA pump but from what I have found this is a CAV DPS pump, not sure how diffrent they are.

Will google some deer service/ dealers in the area and see what they can do.

Or maybe I will just forget it and throw the 200 in there
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Old September 21st, 2009, 11:00 PM
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I'm pretty sure they adjust the same but....

Hey you have skilz... Put in the 200....

I'm thinking this is the three cylinder version as found in some older Ford tractors.

http://www.realdiesel.com/dpapump.html
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  #13  
Old September 21st, 2009, 11:03 PM
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Need to bug you for your timing belt skillz prior to installing it

Do you think it would be easier to install the belt with the motor mounted in the frame minus rad, wings and stuff or on the floor? I am thinking in the frame but not sure.
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Old September 22nd, 2009, 10:34 AM
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It is not in your pictures....

Facing the block..... Between the pump and the block.... You will see a lock nut and screw. That is the fueling adjustment.

The DPA and DPS pumps are completely different.
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  #15  
Old September 22nd, 2009, 01:22 PM
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I did the one on my 300. Went with floor as I was using the frame at the time.

Quote:
Originally Posted by dave_lucas
Need to bug you for your timing belt skillz prior to installing it

Do you think it would be easier to install the belt with the motor mounted in the frame minus rad, wings and stuff or on the floor? I am thinking in the frame but not sure.
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  #16  
Old September 22nd, 2009, 06:49 PM
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ok, picture of the back of the pump

I do not see a lock nut / screw

There are 2 bolt heads and 1 screw hole

Did not have time to try and call any deer / tractor dealers yet but will try.
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  #17  
Old September 22nd, 2009, 09:40 PM
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Between 2 and 3 with the anti-tamper cover, IIRC.....
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