IP Timing - Drip, Drip Particulars

[treiberg]

Trying to assess my injection timing on the 240D. Got the drip tube connected (with the delivery valve removed as specified). Here is what I see for drips:

@35 degrees BTC: If I pump the hand pump, I get a good squirt of fluid out, and dripping at a rate of faster than 1 per second. If I let it drip for 10-15 drips, the drip rate starts to slow. If I wait for 30-40 seconds, I can get one drip per second.

@28 degrees BTC: Same as above, but after squirt comes out, drips are a little slower, about 1 drip per second, but they slow down again.

@25 degress BTC: No fuel comes out no matter how much I prime.

So it looks like my timing is between 25-28 degrees, which isn't too far off (should be 24 degrees).

So my questions are around the drips:
-If you look for drips of once per second, but the drips slow down, when should you time it? Right after it squirts out?
-Should fuel still squirt out if you are right at begin of delivery and prime the pump? I was always able to get a good squirt until 25 degrees.
-When I went just past the begin of delivery should I get no drips at all, even with pump primed, or should the drips just do to something less than 1 drip per second?

Help me with my drips.

[jt20]

you could leave the timing as it is. There may be some more effort starting in very cold weather or nox emissions depending how your state tests diesels

Regardless, you want to measure the drip rate when the fuel system is pressurized. (ie.. when pumping the primer)

[tangofox007]

Originally Posted by treiberg

@35 degrees BTC: If I pump the hand pump, I get a good squirt of fluid out, and dripping at a rate of faster than 1 per second. If I let it drip for 10-15 drips, the drip rate starts to slow. If I wait for 30-40 seconds, I can get one drip per second.

"Residual" dripping doesn't count. The goal is to get 1 drip/sec while priming. That should occur in a very small range (of crankshaft rotation) between "full flow" and "no flow." You might compare it to turning a water faucet almost off.

[Diesel911]

Originally Posted by tangofox007

"Residual" dripping doesn't count. The goal is to get 1 drip/sec while priming. That should occur in a very small range (of crankshaft rotation) between "full flow" and "no flow." You might compare it to turning a water faucet almost off.

As stated above you need to keep the priming pressure up.
I believe for a person doing it the first time it is easier to have someone else pump the Hand Primer for you while you concentrate on rotating the Fuel Injection Pump and watching the drips.

If you rotate the Fuel Injection Pump with the other Hard Lines still attached you will only increase the difficulty in rotating the Fuel Injecton Pump; especially when it may only need a little nudge to get the drips you want.

[treiberg]

Originally Posted by tangofox007

"Residual" dripping doesn't count. The goal is to get 1 drip/sec while priming. That should occur in a very small range (of crankshaft rotation) between "full flow" and "no flow." You might compare it to turning a water faucet almost off.

This is helpful. I have not yet found a place where it just drips. In a matter of 3 degrees it goes from "squirt with after-drips" to "no-flow". Is that typical?

[tangofox007]

Originally Posted by treiberg

This is helpful. I have not yet found a place where it just drips. In a matter of 3 degrees it goes from "squirt with after-drips" to "no-flow". Is that typical?

Yes, that is typical. The range in which "drips" occur is so small that counting the actual drip rate seems to be of less-than-critical importance.