Quote:
Originally Posted by vitop
You had mentioned that the timing would change with the pop pressure. I had wondered if that changed, how you would adjust.
Yes, the IP light uses a spot on the IP camshaft. This was recommended by a Mercedes mechanic to me.
I am not sure what the FSM is or how to use the drip method. Is the drip method better than the AB light?
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The Pop/Nozzle opening pressure is adjusted in each Injector by changing the Shim/s that tension the Injector spring. You need a Nozzle/Pop Tester to do this (you can do a search on Ebay to see a pic). It is a hand pumped hydraulic tester that has a gauge to measure the Pop Pressure.
Changing the spring tension changes the Pop Pressure.
The FSM = Factory Service Manual. There is a description in the DIY section and maybe instructions on how to use the AB light.
I have no experience using the AB light but it does not require that partly take out the #1 Delivery Valve and Delivery Valve spring (Depending on the Model of IP you might need a special Splined Socket to remove and install the Delivery Valve Holder) and you would also need new sealing parts (crush washer and O-ring depending on the model of IP) and a Torque Wrench.
So I suppose the above alone could make the AB light easier to use.
Some members have had frustrating experiences with the drip timing method (best to go to the DIY section and read the instructions to see for yourself).
In the past more that 90% of all inline type Fuel Injection Pumps used some form of the Drip Time Method to time them to the Engine so it clearly works. But, you have to understand what you are doing.
When I first did it 30+ years ago I had my Boss to guide me through it till I got it right. After that while it was not something I looked forward to it was not a problem to Drip Time an IP.
After not working as a Diesel Mechanic since 1990 or so I had to re-learn how to do the Drip Time again now that I have a Mercedes (with the Volvo you have to use a Dial Indicator setup).