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...

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...

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...

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...

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...

. .. ~- 
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...

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...

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...

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...

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...