Honda Bmw 5 Service Manual
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Camshaft Timing Chain 1 VANOS I 4 When engine is started, camshafts are in deactivated camshaft retarded Engine I i oil supply position: . lntalte camshaft is held in RETARDED position by oil pressure. Exhaust camshaft is held in ADVANCED position by preload spring and oil pressure. VANOS Piston out ECM Piston in Within 2 - 5 seconds (50 engine revolutions), the ECM begins monitoring and controlling camshaft positions. The Double VANOS system allows full variability of camshaft timing up to the limits of the system. When the ECM detects that the camshafts are in optimum position, the solenoids are modulated at approximately 100 - 220 Hz to maintain oil pres- sure on both sides of the actuator pistons to maintain timing. In models with DME MS 43.0 (model year2001 and newer), the engine control module (ECM) detects camshaft position before the engine starts, thereby adjusting camshaft timing immediately upon start-up. NOTE- . VANOS system troubleshooting and diagnostics is best accomplished using a scan tool. . Diagnostic Trouble Codes (DTCs) pertaining to the VANOS system are listed in the following table. See also OED On-Board Diagnostics. Elevated oil temperatures can cause VANOS to deactivate. Oil that is too thick (high viscosity) may cause a DTC to be set in the ECM. If VANOS is deactivated (limp-home mode), there will be a noticeable loss of power. VANOS fault codes BMW code P-code Fault description 19 PI529 VANOS solenoid valve activation, exhaust 21 PI525 VANOS solenoid valve activation, intake 103 PI519 VANOS faulty reference value intake 104 PI520 VANOS faulty reference value exhaust 105 PI522 VANOS stuck (Bank I) intake 106 PI523 VANOS stuck (Bank 2) exhaust
1 17-36 Camshaft Timing Chain 1 Double VANOS control unit 1. BoltM6 2. Exhaust camshaft position sensor 3. Sealing ring 4. Camshaft end sealing plug -tighten to 50 Nm (37 ft-lb) 5. Camshaft seal cap 6. VANOS hydraulic piston set screw -CAUTION: left hand thread -tighten to 10 Nm (89 in-lb) 7. Nut M7 -tighten to 14 Nm (1 0 ft-lb) 8. Engine lifting hook 9. Stud M7 10. Nut M6 -tighten to 10 Nm (89 lb-in) 11. Gasket 12. Cylinder head 13. Sealing ring 14. Intake camshaft sensol 15. Bolt M6 16. VANOS control unit 17. Copper sealing ring 18. VANOS oil feed line 19. Banjo bolt -tighten to 32 Nm (24ft-lb)
Camshaft Timing Chain VANOS control unit, removing (M52 TU and M54 engines) This procedure includes removal of the Double VANOS con- trol unit. NOTE- If the Double VANOS control unit is being replaced, camshaft timing must be checked. This procedure requires multiple special tools. Be sure to read the procedures through before beginning the repair. - Working inside luggage compartment, disconnect negative (-) battery cable. Prior to disconnecting the batteg read the battery discon- nection cautions given in 001 General Cautions and Remove engine cooling fan assembly. See 170 Radiator and Cooling System. Remove engine trim covers. Pry out plastic trim caps (arrows). Remove cover fasteners, oil filler cap, and covers. Remove ignition coils: Disconnect ignition coil electrical harness connectors. Remove coil mounting fasteners and coils. NOTE- Make note of ignition coil ground strap locations. Remove spark plugs,
11 7-38 [Camshaft Timing Chain 4 Disconnect electrical harness connector (A), oil line fitting (B), and cranltcase vent tube (squeeze at arrows). NOJE- Oil will drain from VANOS unit fitting. Use shop rags to keep oil off drive belts. - Remove cylinder head cover fasteners, and cover. 4 Remove oil baffle cover from intake camshaft 4 D~sconnect electrical connections from exhaust camshaft po- sition sensor and VANOS control valve (arrows). 4 Using banjo bolt from VANOS control unit oil line, install test fitting (BMW special tool 11 3 450) to VANOS control unit.
11 7-39 Camshaft Timing Chain 4 Cover oil hole in VANOS control unit (arrow) with shop towel to capture oil which will spray when compressed air line is connected. - Connect compressed air line to air fitting. Apply air pressure set to 2 - 8 bar (30 - 110 psi). 4 With compressed air line connected, turn engine clocltwise using crankshaft center bolt at least two rotations, until cylin- der 1 is at (TDC) position (intake and exhaust carnshafl lobes as shown arrows). Do not rotate engine countercloclwise to reach the top dead centerposition. Instead, complete another two complete Remove sealing plug from bore under starter. Lock crank- shafl in TDC position with BMW special tool 11 2 300 (arrow). - 4 Unscrew and remove threaded studs (arrows) at rear of cylinder head.
. .. ~- Camshaft Timing Chain - 4 Secure camshafts in TDC position using BMW special tool set 11 3 240. - Disconnect compressed air line, leaving compressed air fit- ting attached to VANOS control unit. NOTE - Oil will drain from pressure line. Have a container and rags ready 4 Unscrew sealing plugs from VANOS control unit (arrows). NOTE- Oil will drain from sealing plug bores. Have a container and rags ready 4 Pull sealing caps straight out of VANOS control unit with BMW special tool 11 6 170, or with short nose pliers. NOTE- Additional oil may drain from VANOS control unit. 4 Remove set screws (left-hand thread) on ends of intake and exhaust camshafts. NOTE- Set screws have left hand threads. Remove with a clockwise motion.
Camshaft Timing Chain 4 Remove VANOS unit: Remove fasteners from engine support eye. Remove VANOS mounting nuts (arrows) from cylinder head. Slide VANOS control unit and metal gasltet off. NOJE- The VANOS control unit will contain residual oil. Place shop towels beneath adjustment unit when removing. If the VANOS control unit is replaced, or if repair operations are completed that may change camshaft timing, the cam- shaft timing must be checked as described in VANOS tim- ing, checlcing and adjusting (M52 JU and M54 engines). CAUJION- Do not crank the engine with VANOS unit removed. Piston/valve interference may result. VANOS control unit, installing (M52 TU and M54 engines) < Clean contact edges of cylinder head face and double VANOS control unit and apply a thin coat of sealing com- pound (Three Bond 1209 8 or equivalent) to surfaces. I CAUJION- . Make sure all gaskel material is removed from lace of cyl~nder head. Clean sealing lace and keep lree of oil. Checklocating dowel (A) and dowelsleeve (B) at top of cylinder head for damage or incorrect installation. NO JE - If the Double VANOS control unit is beino reolaced. be -. sure to check and adjust camshaft timing, see VA NOS timing, checking and adjusting (M52 JU and M54 en- gines). * If work being carried out has no effect on camshaft timing, it is not necessary to recheck the timing. It is recommend- ed, however, that the VANOS operation be checked using a compatible scan tool once the engine is running.
I Camshaft Timing Chain - Using new gasket, install VANOS control unit to cylinde~ head. Reinstall engine support eye. Tightening torques VANOS control unit to cylinder head M6 nut 10 Nm (89 in-lb) M7 nut 14 Nm (10 ft-ib) 4 Insert and tighten VANOS hydraulic piston set screws on intake and exhaust camshafts. CAUTIOI\C Set screws have left hand thread Tighten counterclocltwise. Tightening torque Hydraulic piston to splined shaft 10 Nm (89 in-lb) (set screw) 4 Replace sealing caps inside VANOS control unit with BMW special tool 11 6 170, or short flat nosed pliers. Insert and secure VANOS sealing plugs (arrows), using new sealing O-rings. Tightening torque Sealing plug to VANOS control unit 50 Nm (37 it-lb) Remove compressed air fitting from VANOS control unit Fit VANOS oil line banjo bolt with new seals. Attach oil line to VANOS control unit. Tightening torque Oil line to VANOS control unit (banjo bolt) 32 Nm (24 it-lb) -
Camshaft Timing Chain - Connect electrical harness connectors to camshaft position sensors and VANOS solenoid valves. - Remove BMW special locking tools from rear of cylinder head. - Remove cranltshaft locking tool and replace sealing plug. Install intake camshaft baffle and cylinder head cover. Checlc for correct seating of half-moon seals (A) in back of cylinder head cover. Use a small amount of Three Bond 1209 O or equivalent sealant at corners (B) of half-moon cutouts. Similarly, seat gasket and seal corners in front of cylinder head, at VANOS control unit. Tightening torque Cylinder head cover to cylinder head (M6) 10 Nm (89 in-lb) - Remainder of installation is reverse of removal. Tightening torques Radiator fan (viscous clutch) to coolant pump 40 Nm (30 ft-lb) Spark plug to cylinder head 25 Nrn (18 ft-lb) VANOS timing, checking and adjusting (M52 TU and M54 engines) Use this procedure to check and, if necessary, adjust cam- shaft timing. This procedure assumes that the cylinder head cover and intake camshaft plastic baffle have been removed. Also, be sure the cooling fan and the spark plugs have been removed. Remove primary camshaft chain tensioner cylinder (arrow). ~~ ~ ~~ ~--~ CA UTlOAC Primary camshaft chain tensioning piston is under spring pressure.
Camshaft Timing Chain Insert BMW special tool 11 4 220 in cylinder head and bring adjustment screw into contact with tensioning rail. NOTE- BMW special tool 11 4 220 is an adjustable primary chain tensioner that simulates the function of the tensioner. Preload primary chain tensioner rail: Tighten adjusting screw on BMW special tool 11 4 220. Tightening torque Primary chain tensioner preload 0.7 Nm (6 in-lb) 4 Unscrew oil pressure pipe from VANOS control unit. Remove banjo bolt from oil pressure line and install BMW special tool 11 3 450. CA UTIOPI- Cover top of VANOS control unit with lint-free shop cloth. At- tachment of compressed air line will force oil to spray out of - Connect compressed air line to air fitting. Apply air pressure set to 2 - 8 bar (30 - 110 psi).