Compression Test - Amended

SECTION
2

GROUP
21

NO.
842

DATE
Sep. 1998

Amended procedure for compression test on older versions of the S70/V70

REFERENCE: TP 2101201, Section 2(20-22, 25-26) B5204, B5234, B5252, B5254 Engines; 850 1992-

TP 2102201, Section 2(21) Reconditioning, Engines B5202, B5204, B5234, B5254; 850 1992-

Amended procedure for compression test on older versions of the S70/V70

Background:

The amendments apply to the S70/V70 from the start of production, up to and including May 1997. see chassi No. below.

Service switch 17/1 can not be used for these models. It is not connected to the starter motor system. carry out the compression test for newer models in the same way as for older models.

Chassi No.:

S70 - 460000
V70 - 395002

Special tools: 999 9689, 115 8540

Compression test

High tension 1





Warning!
The ignition system works with high ignition tension and dangerous voltage in both low and high tension circuits.

High voltages are found throughout the ignition system, including the connectors etc.

Compression (normal value) 2








Note!
Applies when engine is warm, with wide open throttle (WOT) and when turning over the starter motor; 4.2-5.0 r/s (250-300 rpm).

Disconnect the engine speed (RPM) sensor. 3

Separate connector





Remove:

- ignition cables cover plate
- spark plugs.

Remove fuse 11B3 4





Disconnect fuel pump (FP) and ignition system by removing fuse 11B3.

Note!
Service switch 17/1 can not be used.

Preparations for measuring 5





Use a compression meter 999 9689-4 with extension sleeve 115 8540-3.

6
Measure compression with the engine at operating temperature
and wide open throttle (WOT)

Press down accelerator pedal (AP) all the way.





Turn the ignition key to the starting position.

Measure compression in all cylinders.

Reinstall the spark plugs so the gasket is placed against the cylinder head. Torque tighten to 25 Nm (18.4 ft. lbs).

Installing

- components
- fuse 11B3.