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Pressure Loss, Check
 Remove
Remove glow plugs – see operation "Glow Plugs, Remove and
Install".
Remove vacuum pump – see operation "Vacuum Pump, Remove
and Install".
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Detach engine vent hose (1) from cylinder head cover.
For X 20 DTL, Y 20 DTL engines: Remove charge air pipe (2) with
charge air hose.
Detach closure caps from oil filler aperture (3) and from
coolant compensation tank (4).
Remove oil dipstick (5) from oil dipstick guide tube.
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 Adjust
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At fastening bolt of the torsional vibration damper, turn the
crankshaft in engine rotational direction to TDC of the cylinder
being checked.
Bore (arrow) on the camshaft must align
with the relevant guide mark.
- TDC for 1st cylinder.
- TDC for 3rd cylinder.
- TDC for 4th cylinder.
- TDC for 2nd cylinder.
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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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Install
Connect pressure loss tester to compressed air system and
calibrate (observe manufacturer's instructions).
Bolt pressure loss tester in conjunction with Adapter KM-533-B
and Connecting Piece KM-928 into glow plug bore hole.
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Inspect
Read off pressure loss on tester as a percentage. At the same
time, pay attention to any audible deviations in the compressed air
at intake manifold, turbocharger, exhaust system, glow plug bore
holes and crankcase as well as to any bubble formation in the
coolant compensation tank.
Max. permissible pressure loss difference between the individual
cylinders approx. 10 %. The max. pressure loss of one cylinder
should not exceed 25 %
Remove
Remove pressure loss tester with adapter and connector.
Install
Attach closure caps to oil filler aperture and coolant
compensation tank.
Insert oil dipstick into oil dipstick guide tube.
For X 20 DTL, Y 20 DTL engines: Install charge air hose and
charge air pipe with new seal ring – tightening torque 3.5 Nm
/ 2.6 lbf. ft.
Attach engine vent hose to cylinder head cover.
Install vacuum pump – see operation "Vacuum Pump, Remove
and Install".
Install glow plugs – see operation "Glow Plugs, Remove and
Install".
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