Mechanics

COULD YOU PRIVIDE ME WITH INSTRUCTIONS TO REPLACE THE CAMSHAFT ON MY MERCEDES

1983 Mercedes Benz 300se • 98,500 miles

Hi there, I would be really grateful if you could send me the instructions to change the camshaft on a Mercedes 300SE 1983, as I cannot seem to find a manual on this car

Kind Regards

Aidan
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Amcconnon
September 20, 2012.




Removing and installing camshafts

Preliminary Work

Cylinder head cover removed. Refer to Cylinder Head Assembly - Valve Cover - Service and Repair - Procedures See: Valve Cover Service and Repair

NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.
The camshaft bearing caps must be reinstalled at the same point (as their original location).
The inlet camshaft can be removed and installed with or without the camshaft sprocket.

Removal

Rotate crankshaft to 30 BTDC of cylinder 1 (arrow).
NOTE: At 30 BTDC of cylinder 1 the camshafts can be rotated without the valves touching the piston crowns.

Remove chain tensioner (1). Refer to Timing Components - Timing Chain Tensioner - Service and Repair - Procedures - Removing and Installing Chain Tensioner See: Timing Chain Tensioner Service and Repair
Remove front cover (30) and top guide rail (42). Refer to Timing Components - Timing Cover - Service and Repair - Procedures See: Timing Cover Service and Repair
Mark camshaft sprockets (3) and (5) together with timing chain (6) (arrows).
Unbolt exhaust camshaft sprocket (3).
Lift timing chain (6) off at inlet camshaft sprocket (5).
Turn camshafts with wrench (25) tool No. 104 589 00 01 00 (WAF 27) or tool No. 104 589 01 01 00 (WAF 29), so that the lobes of the cams of cylinder 2 press on the middle of the bucket tappets.

Unbolt camshaft bearing caps (1), (4), (6) and (7) of exhaust camshaft (14) and bearing caps (8), (11), (13) and (14) of inlet camshaft (13).
Engine 104.98: Remove thrust washers of camshaft bearing caps (1) and (8), (4) and (11). Refer to Matching Camshafts and Mounting See: Procedures Matching Camshafts and Mounting

Slacken bolts of remaining camshaft bearing caps in steps of one turn until counter-pressure is eliminated.
CAUTION: Camshafts (13) and (14) must not be twisted when slackening or bolting on the camshaft bearing caps.

Take off inlet camshaft (13) and exhaust camshaft (14).
Installation

Check the bucket tappets for ease of movement.
Oil all bearing points and bucket tappets.

Insert inlet camshaft (13) and exhaust camshaft (14) into bearing points at 30 BTDC of cylinder 1, align axially. The lobes of the cams must be facing down centered at cylinder 2 (arrows).
Install camshaft bearing caps (2), (3) and (5) of exhaust camshaft (14) and bearing caps (9), (10) and (12) of inlet camshaft (13).
NOTE: Since 01.93 the camshaft bearing caps are no longer fixed in position with dowel sleeves but bearing caps are centered automatically over the bearing points of the camshafts when the securing bolts are tightened as specified.

Screw bolts of camshaft caps in steps each of one turn alternately, tighten to 21 Nm.
CAUTION: Camshafts (13) and (14) must not be twisted when bolting on the camshaft bearing caps.

Hold camshafts with wrench (25) tool No. 119 589 00 01 00 or 104 589 01 01 00, when bolting on camshaft bearing caps so that the lobes of the cams at cylinder 2 are facing down centered (arrows).
Engine 104.98: Install thrust washers of camshaft bearing caps (1) and (8), (4) and (11) Refer to Matching Camshafts and Mounting See: Procedures Matching Camshafts and Mounting

Install remaining camshaft bearing caps and tighten to 21 Nm.
Install exhaust camshaft sprocket.
Fit timing chain onto camshaft sprockets; pay attention to colored markings.
NOTE: If no colored markings are provided, adjust to basic position of camshafts.

Install front cover and top guide rail. Refer to Timing Components - Timing Cover - Service and Repair - Procedures See: Timing Cover Service and Repair
Install chain tensioner. Refer to Timing Components - Timing Chain Tensioner - Service and Repair - Procedures - Removing and Installing Chain Tensioner See: Timing Chain Tensioner Service and Repair
Check basic position of camshafts. Refer to Adjusting Basic Position of Camshafts See: Adjustments
CAUTION: The camshafts are sensitive to fracturing and must not be subjected to stresses when being removed and installed.

NOTE: When the crankshaft is in the 30 BTDC at cylinder 1 the camshafts can be rotated without the valves touching the piston crowns.

The camshaft code numbers are affixed in each case to the third camshaft bearing journal at the rear (arrows) (behind the camshaft bearing caps) or stamped with paint on the camshaft flanges (arrows).

The camshaft bearing caps are identified with numbers (arrows). The numbering (arrows) of the camshaft bearing caps are also cast in the cylinder heads.

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ASEMaster6371
Sep 20, 2012.


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