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Mercedes-Benz: engine M272, M273. Manual - part 8

AR05.10-P-7800EW

Remove/install chain tensioner

28.11.11

ENGINES 272, 273 in MODEL 212

Chain tensioner

Pressure pin

Timing case cover

P05.10-2353-11

P05.10-2354-08

Cap

Left exhaust camshaft

Removing

Rotate engine at crankshaft center bolt in

*001589650900

direction of engine rotation to a 40°
crankshaft angle after ignition TDC

Remove alternator

AR15.40-P-5032EW

Remove chain tensioner (1) from timing case
cover (2)
Install

Screw new chain tensioner (1) into timing

Replace chain tensioner (1). The

case cover (2) and tightened to prescribed

previously installed chain tensioner (1) must

torque

not be reinstalled since, on removal of
pressure bolt (1a), it is pressed into the end
position and the locking device of the
pressure bolt (1a) prevents its return stroke
This would overstretch the timing chain on
reinstalling.

*BA05.10-P-1008-01B

Remove cap (3)

Turn engine at center bolt on the crankshaft

This unlocks the chain tensioner (1).

with prescribed torque against direction of
engine rotation (arrow), while
counterholding left exhaust camshaft (4) at
rear with a suitable tool

*BA05.10-P-1009-01B

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AR05.10-P-7601-01VA

Separate timing chain

602 589 00 98 00

602 589 02 33 00

602 589 05 63 00

602 589 05 63 01

Case

Chain separating tool

Thrust spindle

Pressure pins

Cover over timing case recess with a
clean cloth.

The timing case recess must be

secured against parts falling down.
Parts that have fallen into the timing
case recess must be removed.

Assemble the chain separating tool

(01) and the

pressure screw (02)

together.

Fit the chain separating tool (01) at

the timing chain (1).

Ensure that the

pressure pin

(03) lies at the pin (arrow) of a timing
chain link.

P05.10-2225-06

Screw in the pressure screw (02) and separate the timing

Remove the

pressure screw (02) and take off the

chain (1).

chain separating tool (01).

Do not let the pins that have been pushed out fall into the

timing case recess.

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AR05.10-P-7601-04VA

Drawing in timing chain

602 589 00 98 00

272 589 03 63 00

Case

Assembly link

Cover over timing case recess with a
clean cloth.

The timing case recess must be

secured against parts falling down.
Parts that have fallen into the timing
case recess must be removed.

Connect the new timing chain (2) and
the old timing chain (1) with

the

assembly link (01).

Fit the lock of the

assembly

link (01) in the direction opposite to
that in which the timing chain is drawn;
otherwise it could get jammed on the
slide rails and come off when the
timing chain is drawn.

P05.10-2226-05

Remove the rags from the timing case recess.

Otherwise, they could get pulled into the timing case

recess when the engine is cranked.

Turn the crankshaft slowly in the engine's direction of rotation
(arrow) and draw in the new timing chain (2) until the ends of
the new timing chain (2) can be connected.

As the new timing chain (2) is being drawn in (arrows),

pull out the end of the old timing chain (1) evenly as it
becomes free.

Cover over timing case recess with a clean cloth.

The timing case recess must be secured against parts

falling down. Parts that have fallen into the timing case recess
must be removed.

Detach the assembly link (01), and separate the old timing

chain (1) from the new timing chain (2).

The assembly link (01) must be removed. The assembly

link is only an aid for assembly and is not suitable for engine
operation.

P05.10-2227-11

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AR05.10-P-7601-02VA

Riveting the timing chain

Timing chain, chain tensioner

Number

Designation

Engine

272

273

BA05.10-P-1007-01B

Bolt for rivet element in timing chain

(reference value)

602 589 00 98 00

272 589 00 39 00

272 589 00 63 00

272 589 01 63 00

Case

Riveting tool

Assembly inserts

Guide

271 589 01 63 00

Assembly inserts

When carrying out work on the timing case recess, safeguard this with a clean cloth to

prevent items dropping down. Parts which have fallen into the timing case recess, must be
removed.

Press the riveted link into the press-fit center plate

Place the assembly insert (F11) in

the rivet press tool (01) and fix in place with

the mounting screw.

Place the assembly insert (D12) in

the rivet press tool (01).

P05.10-2229-01

Insert the riveted link (1), the centering fork (03) and the press-fit center plate (2) into
the ends of the timing chain (4), and press the pins of the centering fork (03) into the
holes of the press-fit center plate (2) and center the press-fit center plate (2).

Insert riveted link (1) from the rear.

P05.10-2230-01

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