Volvo 2003T Service Manual download pdf (Page 30)

Assembly

Control mechanism, injection pumps

8. Control mechanism, design

1. Injection pumps

2. Roller lifter

3. Control screw, roller lifter

4. Control rod

5. Control screw, control rod

6. Centrifugal weights, fuel volume control

7. Control arm

8. Max. engine speed screw

9. Max. volume screw

10. End nipple, control rod

The 2003T-B has a smoke limiter, which maximises

the fuel volume to suit the turbo boost pressure. Quick

acceleration does not give full fuel volume until the

turbocharger has speeded up and gives more than

enough air to burn the amount of fuel required by the

throttle opening. The smoke limiter consists of a

pressure chest (11) and diaphragm (12) which is at

turbo boost pressure. The diaphragm (boost pressure)

bears on piston (13) which is screwed onto the maxi-

mum volume screw (9). The piston movement is

counteracted by spring (14). The smoke limiter is

adjusted individually on each engine. If it is removed,

it must be adjusted again when it is put back. Please

refer to “adjustment, smoke limiter”. The diaphragm

(12) and O-ring (18) can be changed without affecting

adjustment, however.

Diaphragm replacement

Undo the lid with the throttle opening and stop arms.

Unhook the regulator spring and the inner section of

the throttle opening arm. Unscrew the four arms which

keep the smoke limiter housing together, force the

2003T-B

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Volvo 2003T Service Manual Page 30