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Pressure Loss, Check
Engine at operating temperature (oil temperature >= 80
°C).
 Remove
Detach spark plug connectors, remove spark plugs with
KM-194-E.
Remove fluid filler opening sealing cap, coolant compensation
tank sealing cap and oil dipstick.
Remove air cleaner housing with air intake cover – see
illustration "Air Ducts (X 16 SZR)" and illustration "Air Ducts (Z
16 SE)".
Remove upper part of toothed belt cover – see operation
"Toothed Belt Cover – Upper Part, Remove and Install".
 Adjust
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Set piston of 1st cylinder to TDC position. To determine TDC
position – see operation "Timing, Check".
Install
Connect pressure loss tester to compressed air system and
calibrate. Screw connector into spark plug bore of 1st cylinder and
connect pressure loss tester with connector (observe manufacturer's
instructions).
Caution
The crankshaft is not permitted to rotate during the test
procedure. In order to avoid this, engage 1st gear or selector
lever position "P" and apply parking brake.
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Inspect
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Air outlet at: inlet or exhaust side, compensation tank and
crankcase housing. Max. difference in pressure between individual
cylinders: 10%. The max. pressure loss of a cylinder should not
exceed 25%
Check pressure loss at 3rd, 4th and 2nd cylinders analogously.
Bring piston of cylinder to be checked in "ign. TDC" position,
ignition sequence: 1-3-4-2. Determine "ign. TDC" position by
placing guide marks on camshaft pulley. Further turn crankshaft
180° in engine rotational direction (corresponds to 90° at
camshaft pulley) up to camshaft pulley guide mark and align toothed
belt cover. Determine the "ign. TDC" position for 4th and 2nd
cylinders analogously. Turn crankshaft slowly and uniformly.
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Install
Install upper part of toothed belt cover – see operation
"Toothed Belt Cover – Upper Part, Remove and Install".
Install air cleaner housing with air intake cover – see
illustration "Air Ducts (X 16 SZR)" and illustration "Air Ducts (Z
16 SE)".
Install spark plugs with KM-194-E into cylinder head –
tightening torque 25 Nm / 18 lbf. ft.
Attach spark plug connector, fluid filler opening sealing cap,
coolant compensation tank sealing cap and oil dipstick.
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