FAQ

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Q: My injector is leaking externally from the seam in the housing, can it be rebuilt?

A: No. If the injector has a body leak it must be replaced. Fuel leakage is very dangerous. If 2 or more injectors are leaking Externally from the body, and they were not damaged by removal, the entire set should be replaced.

Q: I will not be able to install my injectors for a couple of months. Should I have you service them now?

A: Fuel injectors do have a shelf life. We would recommend waiting three or four weeks to get the service completed.

Q: I have 6 injectors and I have been told that 3 are bad electronically, should I rebuild the other 3?

A: If they have really failed electronically, which is rare. You could rebuild the other 3, but it is our policy to recommend replacing The set. If 50% or more of the injectors are bad, for any reason, the set should be replaced.

Q: I know my injectors need to be serviced but don't want to wait. So I am thinking of purchasing rebuilt ones to Save time?

A: It is always best to rebuild your injectors when possible. If not, know the source.

A: Yes. Almost all injector related problems occur slowly over time, from debris and contamination. They get dirty. Would any of us throw away our jeans because they are dirty? No, we would clean them.

Q: I have had my injectors cleaned on the car, they seemed OK for a short time. Now they have failed again.

A: This is a very common occurrence with on car methods. They usually use a very caustic cleaner forced thru the fuel system. It Does remove some debris, but deposits some at the injector pintle (tip). We believe once those deposits harden, the performance is again decreased. Usually more severe.

Q: I have 2 injectors that I know are bad and they are easy to remove. Can I have just those 2 serviced by CPR ?

A: No. It is our policy to service injectors in sets only. The reason, if one or more injectors have failed the others is not far Behind. It is also very common for this practice to create a new problem, when you service only a percentage of the injectors they will flow at different rates. The electronic control module (ECM) adjusts for the average of the set.

Q: I am rebuilding my engine, it ran great before it blew up. Do I really need to have my injectors serviced?

A: Yes. What caused the engine to fail? This is more common than you may think, many engine failures are partially caused by Dirty injectors. When the performance of the injectors start to decrease the engine or that particular cylinder are starved for Fuel.

Q: Why should I use you to service my injectors? Why is the CPR different from anyone else?

A: We have worked very hard to develop a system that works. The CPR uses a number of special pieces of equipment Developed by us, to guarantee excellent results. The cleaning agent we use is unique; it is our own product as an example.

A: We believe in calling it what it is. Serviced. We are not mechanically disassembling your injector (or is anybody else) or Changing any of its internal parts.

A: Yes. In fact, all injectors we service are cleaned as sets, tested as sets and compared to each other in the set. When Completed they must all perform the same and you will get a flow data sheet.

Q: Can you or do you adjust the volume of each injector to the others in the set?

A: No. Or can anyone else. After cleaning and testing if one or more injector's do not perform the same, they must be replaced.

Q: What if I send you my injectors and you find one that must be replaced what to do?

A: If we have a replacement used core in stock, we will supply it at your option to replace your injector at a reasonable cost. It is serviced with your set and must match your set. If we do not have a core we will suggest you source a new replacement of Same quality

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O-ring boss seal

Why does CPR used ORBS ,

Back in the day (1999) we had NPT at the end of our fuel rails but in Dec 2001 at the PRI SHOW WE every one that we switch over to the ORBS

SHOW THE CPR-O-Ring boss seal is a technique for joining two fluid-carrying pipes, hoses or tubing. In an o-ring boss (abbreviated ORBS) system, a male threaded part is inserted into a female threaded part, providing a mechanical seal. This system differs from others in that an additional nut is tightened over an o-ring into a bevelled area that creates an excellent seal.

This system is used most frequently in hydraulics, although it has been applied to many other systems including vacuum pumps, such as many pumps, in which the intake tee has an o-ring boss seal on the bottom. Being a relatively rare system, it is often confused with others, most commonly NPT. While the threads sometimes fit (although very inexactly), o-ring boss seal systems should never be used with any other as leaks are common when using such an improper method. Under high fluid pressures seen with hydraulic use, a failure of the threads could be deadly!

Because ORBS adapters are relatively rare, one can be fashioned using a 37 degree AN (Army/Navy) flare fitting because the threads are compatible in diameter, pitch and spacing. To do this, a suitable o-ring, washer and nut are obtained separately. The flared end of the male AN flare is machined off. Optionally, a chamfer tool (or, if one cannot be obtained, a drill bit) can then be used to knock the inside shoulder off and make a reverse or inward angle that will smooth the flow of the fluid into the fitting bore. The last step is often unnecessary because most applications don't require a smooth flow of fluid unless operating at an extremely high flow rate.

This system has the advantage of being able to be tightened mechanically before being sealed. Most threaded systems, such as NPT, have a seal provided by a taper in the thread, so it is difficult to orient both ends of the hose, pipe or tube so that it is not twisted. In the o-ring boss system, this problem is eliminated because the threads do not seal the connection and therefore can be rotated at least a full revolution before they are sealed while maintaining a proper mechanical connection. The orientation problem could also be solved with a suitable union.

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-AN Size comparison

AN size

-2

-3

-4

-5

-6

-8

-10

-12

-16

-20

-24

-28

-32

Tube OD (Hose ID)

1/8"

3/16"

1/4"

5/16"

3/8"

1/2"

5/8"

3/4"

1-1/4"

1-1/2"

1-3/4"

SAE thread size

5/16 24

3/8 24

7/16 20

1/2 20

9/16 18

3/4 16

7/8 14

1 1/16 12

1 5/16 12

1 5/8 12

1 7/8 12

2 1/4 12

2 1/2 12

Pipe thread size (NPT)

1/18 27

1/4 18

3/8 18

1/2 14

3/4 14

tech line 248-379-3565

Frequently Asked Questions O-RING AND -AN SIZE COMPARISON

O-ring boss seal