05-310 Removing and installing chain tensioner
Preceding work: Poly-V-belt removed (13-342). | Operation No. of operation texts and operation values or standard texts and flat rates 05-7800 |
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Bolt (49) | slacken (step 1) |
Bolt (51) | unscrew (step 2). |
Alternator | swing outward (step 2). |
Locknut (40) | unscrew. Locknut (40) is pressurized (step 3). |
Seal (41) | replace (step 8). |
Compression spring (39) | take off, insert (steps 3 and 8). |
Chain tensioner casing (36) with setbolt (37) | unscrew (step 4). |
Setbolt (37) with locking spring (38) | press out of chain tensioning casing in the direction of pressure. Check individual parts for wear (step 5). |
Chain tensioner casing (36) | screw into cylinder crankcase, 15 Nm (step 6). |
Setbolt (37) with locking spring (38) | push in (step 7). |
Locknut (40) with compression spring (39) and new sealing ring (41) |
screw in, 70 Nm (step 8). |
Alternator | mount (step 9). |
When engine is running | check for leakage. |
Special tools
001 589 72 21 00
001 589 66 21 00
Commercially available tool
Stud driver insert | e. g. Hazet, |
Note
The housing (36) of valveless, hydraulic lock chain tensioner is screwed in the crank case (1). The application force required to tension the chain is comprised of the force from compression spring (39) and oil pressure in the chain tensioner, depending on engine oil pressure.
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In the event of sudden load the oil feed bore with 1.1 mm (a) and an orifice bore (b) in the setbolt of 1.2 mm prevents the oil escaping rapidly and thus has a damping effect. An embossing is provided in the chain tensioner casing (36) and a locking spring (38) on the setbolt.
36 Chain tensioner casing
37 Setbolt
38 Locking spring
39 Compression spring
40 Locknut
41 Sealing ring
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The locking spring (38) has been modified in order to improve the function of the chain tensioner.
Changes:
Ends free from burrs
Smaller twist
(dimension "a" = 0.1 mm, was 0.5 mm)
Improved material
Dimension "b" = 3.5 mm, was 4.0 mm.
Production breakpoint: 12/1985
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Removing and installing
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1 Slacken lower bolt (49) for alternator fixing.
2 Unscrew upper bolt (51), swing alternator outwards (arrow).
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3 Unscrew locknut (40) and sealing ring (41) and remove compression spring (39).
Locknut (40) is pressurized by the compression spring.
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4 Unscrew chain tensioner case (36) from the cylinder crankcase with the stud driver insert.
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5 The chain tensioner must be stripped down before assembly. To do this press the setbolt (37) and locking spring (38) out of chain tensioner casing (36) in the direction of the arrow. Clean parts and check for wear.
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6 Screw chain tensioner casing (36) onto crankcase, tightening torque 15 Nm.
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7 Push setbolt (37) and locking spring (38) into the assembled chain tensioner casing.
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8 Mount compression spring (39) and locknut (40) with new sealing ring (41), tightening torque 70 Nm.
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9 Mount alternator, tightening torque of the
bolts (49 and 51), 25 Nm.
10 Install in the reverse order.
11 Check for leaks when engine is running.
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