Fuel injection nozzle holder installation

Claim 2

A fuel line installation for a fuel injection nozzle holder used in an internal combustion engine having at least one cylinder head comprising a first bore formed in the cylinder head for receiving the nozzle holder, a second bore formed in the cylinder head communicating with the first bore, and a tube received within the second bore and adapted to communicate with the nozzle holder for delivering fuel thereto, an annular passage being afforded between the tube and the surface of the second bore for conducting return fuel away from the nozzle holder.

Claim 3

The fuel line installation according to claim 1, wherein the second bore communicates with an exterior surface of the cylinder head.

Claim 4

The fuel line installation according to claim 2, further comprising an elongated annular fitting received in the second bore and encircling the fuel delivery tube, the fitting generally closing one end of the annular passage, and a passageway in the cylinder head communicating with the annular passage for conducting return fuel from the annular passage to an exterior surface of the cylinder head.

Claim 5

The fuel line installation according to claim 3, wherein the annular fitting has at least one groove formed in the exterior surface thereof adapted to communicate with the annular passage and the cylinder head passageway for carrying return fuel therebetween.

Claim 6

The fuel line installation according to claim 3, further comprising means for locking the annular fitting in position.

Claim 7

The fuel line installation according to claim 5, wherein the fitting is threadedly received in the second bore and has a portion protruding therefrom, and wherein the locking means includes a locking member threadedly mounted on the protruding portion of the fitting, a gasket disposed between the locking member and the cylinder head, and sealing means disposed between the locking member and the protruding portion of the fitting, whereby locking the annular fitting in position places the locking member in sealing relation with the cylinder head and the fitting.

Claim 8

The fuel line installation according to claim 1, further comprIsing a second tube received within the second bore and encircling the fuel delivery tube, the annular passage being afforded between the second tube and the surface of the second bore, and a fitting secured to the end of the fuel delivery tube adapted to communicate with the nozzle holder for directing fuel from the fuel delivery tube to the holder.

Claim 9

The fuel line installation according to claim 7, further comprising an elongated annular fitting received in the second bore and encircling the fuel delivery tube, the annular fitting threadedly engaging the cylinder head and engaging one end of the second tube so as to maintain the second tube in sealing relation with the fuel directing fitting, and to maintain the fuel directing fitting in sealing relation with the nozzle holder.

Claim 10

The fuel line installation according to claim 7, further comprising a collar disposed between the second tube and the fuel directing fitting.

Claim 11

The fuel line installation according to claim 1, wherein the fuel delivery tube is adapted to communicate with the nozzle holder intermediate its ends, and including seal means for engaging the holder and the surface of the first bore on opposite sides of the point at which the first bore communicates with the second bore so as to prevent fuel from escaping between the holder and the surface of the first bore.

Claim 12

The fuel line installation according to claim 1, further comprising pin means mounted on one of the nozzle holder and the cylinder head, and wherein the other of the nozzle holder and the cylinder head is formed with a complementary slot adapted to receive the pin means, whereby the nozzle holder when installed in the first bore is in the correct position to enable communication with the fuel delivery tube.

Claim 13

A fuel line installation for a fuel injection nozzle holder used in an internal combustion engine having at least one cylinder head comprising: a. a first bore formed in the cylinder head for receiving the nozzle holder; b. a second bore formed in the cylinder head communicating with the first bore; c. a first tube received within the second bore and adapted to communicate with the nozzle holder for delivering fuel thereto; d. a first fitting secured to the end of the first tube adapted to communicate with the nozzle holder for directing fuel from the first tube to the nozzle holder; e. a second tube received within the second bore and encircling the first tube, the second tube adapted to engage the first fitting to maintain it in sealing relation with the nozzle holder; and f. a second fitting received in the second bore and encircling the first tube, the second fitting threadedly engaging the cylinder head and engaging one end of the second tube so as to maintain the second tube in sealing relation with the first fitting, an annular passage being afforded between the second tube and the surface of the second bore for conducting return fuel away from the nozzle holder.

Claim 14

A fuel line installation for a fuel injection nozzle holder used in an internal combustion engine having at least one cylinder head comprising: a. a first bore formed in the cylinder head for receiving the nozzle holder; b. a second bore formed in the cylinder head communicating with the first bore; c. a first tube received within the second bore and adapted to communicate with the nozzle holder for delivering fuel thereto; d. a first fitting secured to the end of the first tube adapted to communicate with the nozzle holder for directing fuel from the first tube to the nozzle holder; e. a second tube received within the second bore and encircling the first tube, the second tube adapted to engage the first fitting to maintain it in sealing relation with the nozzle holder; and f. a second fitting received in the second bore and encircling the first tube, the second fitting threadedly engaging the cylinder head and engaging one end of the second tube so as to maintain the second tube in sealing relation with the first fitting, an annular passage being afforded between the second tube and the surface of the second bore for conducting return fuel away from the nozzle holder.

Claim 15

The fuel line installation according to claim 12, wherein the second bore communicates with an exterior surface of the cylinder head and the second fitting protrudes from the second bore beyond the exterior surface.

Claim 16

The fuel line installation according to claim 12, further comprising a passageway in the cylinder head communicating with the annular passage for conducting return fuel from the annular passage to an exterior surface of the cylinder head.

Claim 17

The fuel line installation according to claim 12, further comprising means for sealingly locking the second fitting in position.

Claim 18

The fuel line installation according to claim 12, wherein the first tube is adapted to communicate with the nozzle holder intermediate its ends, and including seal means for engaging the holder and the surface of the first bore on opposite sides of the point at which the first bore communicates with the second bore so as to prevent fuel from escaping between the holder and the surface of the first bore.