Honda Bmw 5 Service Manual

							
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).