Shown on engine 904.9 |
1 | Soundproofing panel |
2 | Charge air manifold |
3 | Injection line |
4 | Rocker arm assembly |
5 | Valve bridge |
6 | Push rod |
7 | Seal |
8 | Connection piece |
9 | Screw |
10 | Connection fitting |
11 | Engine wiring harness |
12 | Coolant line |
B65 | Coolant temperature sensor |
W01.30-1060-06
Shown on engine 904.9 |
13 | Exhaust manifold with turbocharger |
14 | Constant throttle line |
15 | Coolant line to compressor |
16 | Leak fuel line |
17 | Cylinder head bolt |
18 | Cylinder head |
19 | Cylinder head seal |
20 | Centering sleeve |
W01.30-0017-06
W01.30-0018-09
Shown on engine 904.9 |
14 | Constant throttle lines | 19 | Cylinder head seal | 22 | Straightedge | ||
17 | Cylinder head bolt | 20 | Centering sleeve | 23 | Gearshift lever with holder (only for vehicles with code GS1 ("Manual" gearshift)) | ||
18 | Cylinder head | 21 | Lifting device | L | Shank length |
Only for engine 906.9 with code GS3 ("Hydraulic" gearshift) |
30 | Hydraulic lines |
31 | Clamps |
32 | Bracket |
33 | Screw |
W26.60-1011-11
| Remove/install | ||
1 | Switch off ignition | ||
Danger | Risk of fire/risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death due to voltage U >= 30 V AC and U >= 60 V DC. | No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers. | |
2 | Disconnect ground line from battery | ||
Topical note | Notes on battery | ||
3 | Open maintenance flap | ||
Warning | Risk of injury caused by body parts being pinched or crushed as cab is tilted | Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure it with the safety strut. | |
4 | Tilt cab | ||
Topical note | Notes on tilting the cab | ||
Installation: Only tilt back cab after the leak test. | |||
Warning | Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant. | Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. | |
5 | Drain off coolant | ||
Topical note | Notes on coolant | ||
6 | Remove noise encapsulation (1) at rear frame | ||
7.1 | Remove gearshift lever with holder (23) at cylinder head (18) | Vehicles with code GS1 ("Manual" gearshift) | |
7.2 | Remove clamps (31) and bracket (32) of hydraulic lines (30) at cylinder head (18) | Vehicles with code GS3 ("Hydraulic" gearshift) | |
8 | Remove charge air manifold (2) |
| |
Model 673, 674, 676 | |||
9.1 | Remove exhaust manifold with exhaust gas turbocharger (13) at cylinder head (18) | Model 374, 375, 673, 674, 676, 950, 952, 953, 954, 958, 970, 972, 974, 975, 976 | |
9.2 | Remove exhaust manifold at cylinder head (18) | Model 957 | |
10 | Remove injection lines (3) | ||
11 | Remove constant throttle line (14) at cylinder head (18) | ||
12 | Remove leak fuel line (16) at cylinder head (18) | ||
13 | Remove compressor coolant line (15) at cylinder head (18) | ||
14 | Disconnect engine wiring harness (11) at coolant temperature sensor (B65) | ||
Warning | Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant. | Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. | |
15 | Remove connection piece (8) at cylinder head (18) and at coolant pump | ||
Installation: Replace connection fitting (10) and seal (7). | |||
Bolt, connection piece for coolant pump to cylinder head | |||
16 | Remove rocker arm assembly (4) |
| |
Engine 904.9 as of engine end no. 039740, engine 906.9 as of engine end no. 041956 | |||
17 | Remove pushrods (6) | Installation: Ensure that the pushrods (6) are seated correctly in the tappets. | |
18 | Remove rear lifting eye | ||
Only for model 957. | |||
19 | Remove cylinder head bolts (17) | ||
Installation: Observe tightening specification for cylinder head bolts (17). | |||
Cylinder head bolts on crankcase | |||
Socket wrench bit | |||
20 | Lift off cylinder head (18) using lifting device (21) and remove cylinder head gasket (19) | ||
| Exhaust valve spring, exhaust valve and exhaust valve seat ring modified | ||
| |||
Installation: Install new cylinder head gasket (19) with lettering facing upwards. Ensure centering sleeves (20) are correctly seated. | |||
Lifting device | |||
21 | Close off all bores on cylinder crankcase contact surface using fabricated stop plugs | ||
| Stop plugs for closing off bores | ||
| Check | ||
22 | Check crankcase sealing surface | ||
Replace damaged crankcase sealing surface if necessary. | |||
Crankcase flatness of separating surface | |||
23 | Measure shank length (L) of cylinder head bolts (17) | If max. shank length (L) was exceeded, corresponding cylinder head bolt (17) must be replaced. | |
Cylinder head bolts | |||
24 | Check cylinder head sealing surface for cracks and damage, also check cylinder head gasket (19) | ||
Height of cylinder head | |||
Permissible variation in flatness of lower separating surface in a longitudinal direction | |||
Replace or surface-grind cylinder head (18) if necessary: | |||
| |||
Surface-grind cylinder head face. | |||
| |||
25 | Install in the reverse order | ||
Warning | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
26 | Start engine and allow to run in idle for 10 until the oil pressure has built up, then run the engine at varying speeds | ||
27 | Switch off engine and check area of cylinder head (18) for leaks | Visual inspection. | |
28 | Check engine oil level with oil dipstick or on display, add oil if necessary | ||
Notes on engine oil | |||
Observe engine oil grade set in maintenance system or Specifications for Operating Fluids. | |||
29 | Synchronize the time of the tachograph disk record | Only for vehicles with modular tachograph. |
Check values of crankcase |
Number | Designation | Engine 902.9 with code MS8, engine 906.9 with code MS8 | Engine 904.9 , engine 906.9 without code MS8 | ||
BE01.40-N-1013-02B | Crankcase flatness of separating surface | over the entire length | mm | 0,030 | 0,030 |
Over a length of 150 mm in longitudinal or Transverse direction | mm | 0,015 | 0,015 |
904 589 01 63 00
Lifting device
422 589 02 09 00
Socket wrench bit
Referenced documents
- ah1800n010101ha Notes on engine oil
- ah2000n208001a Notes on coolant
- ah5410p000101a Notes on battery
- ah5410p000101a
- ah6080n000301a Notes on tilting the cab
- ar0130w580007a
- ar0130w580007a Tightening specifications for cylinder head bolts
- ar0130w580015b Check cylinder head sealing surface and cylinder head gasket
- ar0130w7162a Check/face-grind cylinder head contact surfaces
- ar0140w9129a Check/repair cylinder crankcase sealing surface
- ar0500w5521a Removing/installing rocker arm assembly
- ar0500w5521c Remove/install rocker arm assembly
- ar0715w9235a Remove/install MR/PLD injection lines
- ar0941w8681a Remove charge air manifold, install
- ar0941w8681c Removing/installing charge air manifold
- ar1410w3915a Remove/install exhaust manifold
- ar1410w3915jb Remove/install exhaust manifold
- ar2000w1142c Drain/fill in coolant
- ar2010w129002a Remove/install connection piece of coolant pump to cylinder head
- ar2200w100001h Detach/attach rear lifting eye
- as0000z000501a Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.
- as2000z000101a Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.
- as5410z000101a Risk of fire/risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of
- as6080z000101a Risk of injury caused by body parts being pinched or crushed as cab is tilted
- bt0530n000401rh Exhaust valve spring, exhaust valve and exhaust valve seat ring modified
- wf5850w010004a Stop plugs for closing off bores