0231 - Checking the injection nozzle A. Facet-type pintle nozzle, B. Hole-type pintle nozzle Engines 601, 602.91, 603.91 (note deviations for off-road vehicles) · ra07016010231x · Mercedes-Benz WIS

07.1-231 Checking injection nozzles

Injection nozzles removed 07.1-230

Job no. of Job Texts and Work Units or Standard Texts

and Flat Rates 07-6712

A. Facet-type pintle nozzle

B. Hole-type pintle nozzle

Injection nozzle (30)	on tester (052) vigorously pump through 5 times, while keeping valve "a"closed.
Buzzing test	slowly actuate hand lever "b" approx. 1 stroke per second.
Spray pattern test	With rapid short strokes, approx. 2 strokes per second, the spray pattern must be rather closed and should break off well. A - Spray pattern frayed "poor" B - Spray pattern closed "good"
Pre-spray	check (only with hole-type pintle nozzles).
Shut-off pressure or opening pressure	check by opening valve "a" and slowly operating hand lever "b" at least 1 stroke per second. Set value: 115-125 bar with new nozzles, min. 100 bar with used nozzles.

Special tool

Commercially available tools


Tester EFEP 60 H	e. g. Bosch, Order no. 0 681 200 502
Cleaning needle 0.18 mm dia.	e. g. Bosch, Order no. KDEP 2900/4

Note
Use only clean test oil or filtered diesel oil for testing. On no account should the hand be brought in contact with the spray of a nozzle during testing. The spray enters deeply and destroys the tissue. The fuel entering the blood stream may lead to blood poisoning.

The facet-type pintle nozzle "DN 0 SD 265" was installed temporarily in engine 601.91 (instead of DN 0 SD 261).

This nozzle has a minor change on the throttle pintle (41).

Identification: Green color dot on nozzle holder.

Production breakpoint: November 1984


Model	Engine	Engine end no. manual transmission automatic transmission	Chassis end no.
201.122	601.911	057850 005975	A 156160
124.120	601.912	000386 000024	A 001220

The facet-type pintle nozzle DN 0 SD 261 was temporarily installed inengine 601.921  (instead of DN 0 SD 240).The nozzle has an inclined facet (arrow) on the throttle pintle (41).The throttle effect is improved in this way.

Identification: Yellow color dot on nozzle holder.

Production breakpoint: September 1984 - November 1984


Model	Engine	Engine end no. manual transmission automatic transmission	Chassis end no.
201.122	601.921	001825-002001 004791-005625	F 027925 - F 054261

Since August 1989 finely ground injection nozzles have been fitted to engine 602, 603.

Production breakpoint: August 1989


Model	Engine	Engine end no. manual transmission	Engine end no. automatic transmission
124.125 124.185 124.128 124.130 124.190 124.133 124.193 124.330 124.333 124.393	602.9121) 602.9622) 603.9121) 603.9602) 603.9131) 603.9632)	144201 000093 053162 - 000639 -	021158 000319 034696 023344 000615 001799
201.126 201.128	602.9111) 602.9612)	082780 000177	016395 007086
460.3 460.3 460.3 460.3	602.9301) 602.9311) 602.9391) 602.9311)	001863 000010 000008 000021	000047 - - 000006

Identification 1) 2 green color dots
2) 2 violet color dots

Engine 601.913 in model 202

The needle diameter has been reduced from
6 mm to 5 mm in order to minimize pollutant emissions. It is not possible to install in engines manufactured prior to this date.

A. Facet-type pintle nozzle

Checking

-------------------------------

1 Vigorously pump injection nozzle 5 times with the tester. Then check buzzing of the nozzle by slowly actuating the hand lever (approx. 1 stroke per second).

2 Checking spray: With short rapid part strokes (at least 2 strokes per second) the spray pattern should be rather closed and break off well.

A Closed spray pattern, well atomized

B Broken spray pattern, too wide and frayed

3 Checking injection pressure: Set value 115-125 bar with new nozzle, at least 100 bar with used nozzles.

Slowly move down the hand lever (at least 1 stroke per second) and read injection pressure off pressure gauge.

Shut-off valve must be open for this test.

B. Hole-type pintle nozzle

1 Before checking: Ensure that the longitudinal bore (15) is unobstructed by means of a cleaning needle 0.18 mm dia.

2 Vigorously pump injection nozzles 5 times on tester. After this carry out buzzing test by slowly actuating hand lever (at least 1 stroke per second).

3 Spray test: With short rapid part strokes (approx. 2 strokes per second) the spray should be rather closed and break off well.

A Closed spray pattern, well atomized

B Broken spray pattern, too wide and frayed

4 Create pre-spray by slowly moving the hand lever down (1 stroke 4-6 s).

A vertical string-type spray pattern should emerge from the center bore (15).

Note
On new nozzles the pre-spray is very difficult to create, therefore check longitudinal bore with cleaning needle 0.18 mm dia. for open passage.

5 Checking injection pressure:

Set value: 115-125 bar with new nozzle, at least 100 bar with used nozzle.

Slowly move hand lever down (approx. 1 stroke per second) and read injection pressure off pressure gauge.

Shut-off valve must be open for testing.

0231 - Checking the injection nozzle A. Facet-type pintle nozzle, B. Hole-type pintle nozzle Engines 601, 602.91, 603.91 (note deviations for off-road vehicles)

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