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                        PT Fuel injector assembly

Cummins injectors.— A PT injector is provided at each engine cylinder to spray the fuel into the combustionchambers. PT injectors are of the unit type and are operated mechanically by a plunger return spring and arocker arm mechanism operating off the camshaft.

There are four phases of injector operation, which are as follows:

Metering
The plunger is just beginning to move downward and the engine is on the beginning of the compression stroke. The fuel is trapped in the cup, the check ball stops the fuel flowing backwards, and fuel begins to be pressurized. The excess fuel flows around the lower annular ring, up the barrel, and is trapped there.

Pre-injection
The plunger is almost all the way down, the engine is almost at the end of the compression stroke, and the fuel is being pressurized by the plunger.

Injection
The plunger is almost all the way down, the fuel injected out the eight orifices, and the engine is on the end of the compression stroke.

Purging
The plunger is all the way down, injection is complete, and the fuel is flowing into the injector, around the lower annular groove, up a drilled passageway in the barrel, around the upper annular groove, and out through the fuel drain. The cylinder is on the power stroke. During the exhaust stroke, the plunger moves up and waits to begin the cycle all over.

Proper injector adjustment and maintenance will ensure a smooth running engine as long as the following factors are met:
1. Adequate fuel delivery pressure from the fuel pump to the fuel manifold.
2. Selection of the proper sizes of balance and metering orifices.
3.The length of time that the metering orifice is uncovered by the upward moving injector plunger.

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Q1 :  Are you a Cummins fuel system assembly manufacturer or distributor?

A1:   We are a professional Cummins fuel system assembly distributor and obtained authorization of distribution from CCQFSC.

Q2:  who is CCQFSC (China CNHTC Chongqing Fuel Injection System Co.,Ltd)

A2:  Manufactured Under Cummins License From Cummins U.S.A.

CCQFSC is the Fuel System Supplier to Cummins Engine Co.,Ltd.

Q3:  Do you have a good discount for all the products?

A3:  Yes, Most of  our customer who have found our Cummnis Fuel System Assembly is superior in quality while saving much cost from working with us!

Q4:  Can you deliver the goods quickly?

A4: Yes, we have a large number of stock in our warehouse.

Q5:  Can you provide technical support?

A5: Yes, we can provide technical support for our customer.