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Home >> Mercedes Benz >> 2021 >> CLS450 Base >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Automatic Transmission - 257 Chassis 1 Of 2 >> Testing & Repair >> Remove/Install Automatic Transmission Oil Pan - AR27.10-P-7031MSA

Remove/Install Automatic Transmission Oil Pan - AR27.10-P-7031MSA

Transmission 725.0/1 in model 257 

Fig 1: Automatic Transmission Oil Pan Components Location - Transmission 725.0 In Model 257
G14548368Courtesy of MERCEDES-BENZ USA
G14548369Courtesy of MERCEDES-BENZ USA
G14548370Courtesy of MERCEDES-BENZ USA
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer. AS00.00-Z-0010-01A
WARNING Risk of injury.  Moving parts can pinch, crush or, in extreme cases even sever extremities. No parts of the body or limbs should be within the operating area of mechanical components when moving components. AS00.00-Z-0009-01A
WARNING Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
CAUTION Risk of injury  to skin and eyes due to handling of transmission oil. Health risk caused by swallowing transmission oil Wear protective gloves, protective clothing and safety glasses.
Do not pour transmission oil into beverage bottles.
AS00.40-Z-0001-01A
CAUTION Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.
AS00.00-Z-0017-01A
Notice  Notes on bolted connections with self tapping screws   AH00.00-P-0007-01SF
Notice  Notes on self-locking nuts and bolts   AH00.00-P-0001-01KOA
Notice  Notes on threaded connections fastened using a tightening angle-based tightening process   AH00.00-P-0020-01A
  Notes on automatic transmission   AH27.19-P-0001-01NKB 
REMOVING Remove     
1 Remove center and rear lower engine compartment lining.   AR61.20-P-1105FR
2 Thoroughly clean oil pan (34) and surrounding area. Assembly cleaner *BR00.45-Z-1028-04A 
3 Remove screw plug (30). IMPORTANT Position oil receptacle under oil pan (34).
IMPORTANT Commercially available devices/tools
Oil receptacle
IMPORTANT Open screw plug (30) using SPECIAL TOOL socket wrench.
 
    SPECIAL TOOL Socket wrench Fig 2
4 Drain fluid from transmission. IMPORTANT Set overflow pipe (31) to "draining large oil filling capacities" position (Pos. 4) using SPECIAL TOOL socket wrench.  
    SPECIAL TOOL Socket wrench Fig 4
5 Remove heat shield at transmission (35).   AR27.40-P-0700-01LF
6 Remove holders that are installed on oil pan (34) from oil pan (34). If holders are present.
IMPORTANT The number of holders can vary depending on the equipment variant.
 
7 Remove nuts (37) of engine mount (36) from crossmember (38) and lift transmission (35). Transmission 725.0/1 in model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
 
REFER TO SPECIAL TOOLS 000 588 10 62 00 Support plate   WS26.00-P-3309B
REFER TO SPECIAL TOOLS 000 588 11 62 00 Major assembly mount   WS01.00-P-0092B
8 Unscrew screws (1 to 10). SPECIAL TOOL Socket wrench bit Fig 3
9 Lower transmission (35) until engine mount (36) makes contact with crossmember (38). Transmission 725.0/1 in model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
 
REFER TO SPECIAL TOOLS 000 588 10 62 00 Support plate   WS26.00-P-3309B
REFER TO SPECIAL TOOLS 000 588 11 62 00 Major assembly mount   WS01.00-P-0092B
10 Remove oil pan (34) from transmission (35).    
11 Take overflow pipe (31) and swirl pipe for ultrasound measurement (29) out of oil pan (34).    
12 Remove seal (33). Only when reusing the oil pan (34).  
CLEAN Clean     
13 Clean sealing surfaces of oil pan (34) and magnets. Only when reusing the oil pan (34).
NOTES
Sealing surfaces must be absolutely free of oil and grease.
Otherwise leaks may occur.
 
    IMPORTANT Let assembly cleaner flash off completely. Assembly cleaner *BR00.45-Z-1028-04A 
14 Clean sealing surface at transmission (35). NOTES
Sealing surfaces must be absolutely free of oil and grease.
Otherwise leaks may occur.
 
    IMPORTANT Let assembly cleaner flash off completely. Assembly cleaner *BR00.45-Z-1028-04A 
INSTALLING Install     
15 Attach seal (33). NOTES
Do not apply any sealant or sealing compound to oil pan (34) and transmission (35).
Otherwise leaks may occur.
IMPORTANT Replace seal (33).
 
16.1 Replace overflow pipe (31) and swirl pipe for ultrasound measurement (29) of oil pan (34). When installing new oil pan (34).
IMPORTANT Press overflow pipe (31) and swirl pipe for ultrasound measurement (29) firmly onto base of oil pan (34).
 
16.2 Check overflow pipe (31) and swirl pipe for ultrasound measurement (29) for firm seating on base and for signs of damage. If oil pan (34) is to be reused.
If problems occur, ↓ 
replace overflow pipe (31) and swirl pipe for ultrasound measurement (29).
IMPORTANT Press overflow pipe (31) and swirl pipe for ultrasound measurement (29) firmly onto base of oil pan (34).
 
17 Attach oil pan (34) to transmission (35) and position screws (1 to 8).    
  Notes on oil pan versions Transmission 725.0 in model 257 AH27.10-P-0002-01EWN 
    NOTES Transmission 725.0 in model 257
An old variant of the oil pan (34) must not be installed.
Otherwise, the ultrasound measurement method cannot be used.
IMPORTANT Replace screws (1 to 8).
IMPORTANT Replace oil pan (34) when replacing oil filter (32).
Oil filters (32) cannot be obtained individually.
 
18 Lift up transmission (35). Transmission 725.0/1 in model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
 
REFER TO SPECIAL TOOLS 000 588 10 62 00 Support plate   WS26.00-P-3309B
REFER TO SPECIAL TOOLS 000 588 11 62 00 Major assembly mount   WS01.00-P-0092B
19 Partially screw-in screws (9, 10). IMPORTANT Replace bolts (9, 10).  
20 Tighten screws (1 to 10). IMPORTANT Tighten screws (1 to 10) of oil pan (34) in numerical sequence.  
    TORQUE SPECIFICATION Screw/bolt, oil pan to transmission housing *BA27.10-P-1010-04H 
    SPECIAL TOOL Socket wrench bit Fig 3
21 Lower transmission (35). Transmission 725.0/1 in model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
 
REFER TO SPECIAL TOOLS 000 588 10 62 00 Support plate   WS26.00-P-3309B
REFER TO SPECIAL TOOLS 000 588 11 62 00 Major assembly mount   WS01.00-P-0092B
22 Attach nuts (37) of engine mount (36) to crossmember (38). Transmission 725.0/1 in model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
 
REFER TO SPECIAL TOOLS 000 588 10 62 00 Support plate   WS26.00-P-3309B
REFER TO SPECIAL TOOLS 000 588 11 62 00 Major assembly mount   WS01.00-P-0092B
    TORQUE SPECIFICATION Rear engine mount to engine support *BA22.10-P-1004-03N 
23 Attach holders to oil pan (34). If holders were present.
IMPORTANT The number of holders can vary depending on the equipment variant.
 
    TORQUE SPECIFICATION M6X1 *BA00.10-P-1002-04A 
24 Attach heat shield to oil pan (34).   AR27.40-P-0700-01LF
    TORQUE SPECIFICATION Screw/bolt, heat shield to oil pan *BA27.10-P-1009-04H 
25 Fill transmission (35) with oil.   AR27.00-P-0270EWN 
    NOTES Always follow the work procedure and observe the Specifications for Operating Fluids. Otherwise the transmission (35) will be damaged.  
26 Install center and rear lower engine compartment lining.   AR61.20-P-1105FR
METRIC SCREWS/BOLTS AND NUTS AS PER MBN 10 105, 10 143

Number Designation 8.8 10.9
BA00.10-P-1002-04A M6X1 Nm 9 13
ENGINE MOUNT, ENGINE SUPPORT (ENGINE SIDE)

Number Designation Model 257
BA22.10-P-1004-03N Rear engine mount to engine support M6 Nm 18
M8 Nm 30
AUTOMATIC TRANSMISSION COMPLETE

Number Designation Transmission 725.0/1
BA27.10-P-1009-04H Screw/bolt, heat shield to oil pan Nm 9
AUTOMATIC TRANSMISSION COMPLETE

Number Designation Transmission 725.0/1
BA27.10-P-1010-04H Screw/bolt, oil pan to transmission housing Stage 1 Nm 4
Stage 2 ∠° 90
Fig 2: Identifying Socket Wrench (724 589 01 09 00)
G11971894Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Socket Wrench Bit (725 586 00 09 00)
G14546774Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Socket Wrench (725 589 00 09 00)
G11971897Courtesy of MERCEDES-BENZ USA
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1028-04A Assembly cleaner A 000 986 56 01