2021年12月27日星期一

How to Deal With Power Loss Under Heavy Pull for Detroit Diesel Engine Series 60

 

In extreme cold ambient conditions, the engine will operate in Condensation Protection.During this mode of operation, the engine boost will be reduced and there is no reduction of power. Operating in this mode is a normal operating condition and will not affect engine life or performance.

Note: Trucks operating with winter fronts will experience this condition less often.

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Perform the following steps for power loss under heavy pull

1.Check for diagnostic trouble codes.

[a] If Fault Codes are logged, diagnose the logged codes first.

2. Visually inspect the air filter restrictions.

[a] If the air filter is clogged or dirty, replace the air filter.

3. Visually inspect the air inlet hoses for soft or collapsed areas.

[a] If the air inlet hoses are damaged, replace as necessary.

4. Visually inspect the air inlet for restrictions.

[a] If the air inlet has restrictions, clean as necessary.

5. Visually inspect the entire length of the breather tube for kinks.

[a] If the breather tube has kinks, repair as necessary.

6. Measure the fuel pressure under heavy loads.

[a] If the fuel pressure was spiking or decreasing, perform step 7.

[b] If the fuel pressure was not spiking or decreasing, testing is complete.

7. Remove the fuel pump.

[a] If the fuel pump is damaged, replace the fuel pump.

[b] If the fuel pump is not damaged, perform step 8.

8. Remove the fuel injectors and inspect for combustion passing the seat.

[a] If seats are damaged, replace as necessary.

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Note:

The injector may need to be replaced also.

If the seats are not damaged, testing is complete.

2021年12月7日星期二

How to Measure Modulator Pressure for Mercedes-Benz 722

 

This instruction will show you how to measure modulator pressure for Mercedes-Benz 722. Please note, to measure the modulator pressure, position the pressure hoses through right front door window and roll up the window to hold in place. The pressure hoses should not sag or touch the exhaust pipe.

 

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Procedures:

Disconnect vacuum line(10) on vacuum control unit(60)


Operate vehicle approx.50 km/h with the selector lever in position D and read off pressure value

Adjustment of modulator pressure

Remove rubber cap on vacuum control unit.

Pull retaining plate(2) out of retaining slots until it can be turned.



The adjustment screw in the vacuum control unit can then be adjusted with the retaining plate. One rotation of the adjustment screw change the pressure approx.0.4 bars.

After adjusting the adjustment screw, press the retaing plate back into the retaining slots.

Reinstall rubber cap on vacuum control unit(60)

Measure modulating pressure again

Reattach vaccum line(10)

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Electrical Wiring and Harnessing Installation on 2006 GM/Isuzu Truck

  To increase the reliability of the wiring, all frame harnesses are covered with corrugated vinyl tubing. The following instructions apply ...