Installing Oil Guide Housing

Information 

If cold or excessively low-tempered components are sealed to each other by applying sealant, leaks can occur because of condensed water forming or components distorting. Components must be uniformly at least → Temperature: 17°C  .

Information 

The tightening specifications for the basic engine are stored centrally (→ 1001IN TIGHTENING TORQUES, TIGHTENING SEQUENCES, ASSEMBLY OVERVIEWS ).

Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.

1. Clean sealing surfaces on the oil guide housing and crankcase. The sealing surfaces must be dry and free of grease.
2. Apply liquid sealant to the oil guide housing. Apply Doboseal 224N sealant using the hand-held cartridge. The contour of the bead of sealant must be as shown in the figure shown below. The sealing bead should be approx. 1.0 mm wide and high. Ensure that the bead of sealant is continuous and that there are no gaps. → Applying sealant to oil guide housing 
   1. Seal application (geometry, 1-mm bead of sealant)
   2. Doboseal 224N sealing compound
   1. Direction of travel
   Fig 1: Identifying Oil Guide Housing Sealant Applying Area

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3. Insert a new sealing ring into the ring groove on the lower part of the crankcase and bond it with a very small amount of grease.

   Information 

   When installing the oil guide housing, make sure that it is perfectly aligned and that there is no dirt or dust between the components. Fit the oil guide housing straight. The maximum offset must be less than 0.1 mm and it must not project over the crankcase. Otherwise, leaks can occur while driving.

4. Place the oil guide housing on the crankcase and push evenly against the transmission bell housing.
5. Screw in a fastening screw on each corner of the oil guide housing and tighten screws by hand.

   Information 

   • If the transmission or engine is removed, the oil guide housing must be aligned using a dial gauge  .
6. Then screw in all screws by hand. While doing this, push the oil guide housing towards the transmission. Also fit the two transmission screws and tighten hand-tight.
7. Starting at the transmission flange and proceeding forwards, tighten the screws evenly and in diagonally opposite sequence. Don't forget the five screws from the top to the timing-case cover. (Four screws can be seen in the illustration, the fifth screw is behind the oil-pressure sender.) → Screws between timing-case cover and oil guide housing Observe the different tightening torques  .
   Fig 2: Locating Timing-Case Cover And Oil Guide Housing Screws

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8. Install oil-pressure sender.
   1. 8.1. Replace sealing rings for adapter and oil-pressure sender.
   2. 8.2. Slide oil-pressure sender -3-  into the adapter -1-  .
   3. 8.3. Fit the fastening screws -4-  .
   4. 8.4. Plug in connector for oil-pressure sender.
   Fig 3: Identifying Oil Pressure Sensor

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   1. Screws, M6 x 20
   2. Sealing flange
   3. O-ring
   4. Screw, M6 x 30; oil guide housing to lower part of crankcase
   5. Oil level sensor
   6. Screw, M6 x 25; oil level sensor to oil guide housing
   Fig 4: Identifying Oil Guide Housing With Accessories

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9. Tighten the bottom two screws between the transmission and oil guide housing → Screws between oil guide housing and transmission  . For details, see → 373527 REMOVING AND INSTALLING TRANSMISSION
   Fig 5: Locating Oil Guide Housing And Transmission Screws

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10. After fitting the oil guide housing, the connecting tubes (oil lines and oil pipes) between the oil pump and oil guide housing must be fitted. On the Turbo, fit the side oil suction pipes. See illustrations below.
    1. Oil extraction line for turbocharger, cylinders 1 to 4
    2. Oil extraction line for turbocharger, cylinders 5 to 8
    3. Intake pipe on oil pump
    4. O-ring
    5. Oil pressure pipe
    6. O-ring
    7. O-ring, 22 x 3
    8. Oil regulating line
    9. O-ring
    10. O-ring
    11. Screw, M6 x 16; oil pressure pipe to oil pump and oil guide housing
    12. Screw, M6 x 20
    Fig 6: Identifying Oil Lines, Oil Pressure Pipe And Screws - Turbo Engine

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    1. For arrangement of oil lines, see other illustrations below
    2. Direction of travel
    1. Intake pipe on oil pump
    2. O-ring
    3. Oil pressure pipe
    4. O-ring
    5. O-ring
    6. Oil regulating line
    7. O-ring
    8. O-ring
    9. Screw, M6 x 16; oil pressure pipe to oil pump and oil guide housing
    10. Screw, M6 x 20
    Fig 7: Identifying Oil Lines, Oil Pressure Pipe And Screws - Naturally Aspirated Engine
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    1. 1  - Mounting for oil extraction line for turbocharger, cylinders 1 to 4
    2. 2  - Mounting for oil extraction line for turbocharger, cylinders 5 to 8
    3. 3  - Mounting for oil separator vent line, cylinders 5 to 8
    4. 4  - Mounting for oil pump intake pipe
    5. 6  - Mounting for oil pressure pipe
    6. 9  - Mounting for oil regulating line
    1. Direction of travel
    Fig 8: Identifying Oil Lines And Intake Pipe - Turbo Engine
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    1. Mounting for oil pump intake pipe
    2. Mounting for oil separator vent line, cylinders 5 to 8
    3. Mounting for oil pressure pipe
    4. Mounting for oil regulating line
Fig 9: Identifying Oil Lines, Intake Pipe - Naturally Aspirated Engine
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