Bosch TKA 865. Operator's Manual download pdf (Page 42)

Exhaust system

Measuring the exhaust backpressure

The exhaust backpressure must be measured dur-

ing startup.

The measuring point of the exhaust gas backpres-

sure (thread M14 x 1.5) must be located in a

straight pipe section.

Measurements immediately behind the exhaust

turbocharger falsify the result by up to 20 mbar.

The quantity to be measured is the static pressure,

i.e. the measuring connection must fit flush with

the inside of the pipe wall.

Measurements of the ram pressure and in pipe

bends will produce inaccurate results.

During the measuring operation the engine must

run at maximum power and rated speed.

The simplest measuring instrument is a U−pipe

manometer filled with water.

(1 hPa = 10 mm Ws)

Dia. 3 mm

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Bosch TKA 865. Operator's Manual Page 42