Honda Bmw 5 Service Manual

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Lr -- - - - -- Cylinder Head Removal and Installation I - 
- Release  pressure  at compression gauge  valve, then remove 
gauge from spark  plug hole. Repeat test for each cylinder 
and  compare  results with values given  in Table  a. 
Table  a. Compression  testing specifications 
Minimum  compression 
6-cylinder 
10-1 1  bar (142-156  psi) 
V-8 12-14 bar (174-203 psi) 
Maximum  difference between 
cylinders  (all engines) 
0.5 bar  (7 psi) 
- Compression  readings may  be interpreted  as...

113-8 
[cylinder Head Removal  and Installation 1 
Cylinder leak-down test 
The  most conclusive diagnosis  of low compression symp- 
toms  requires a cylinder leak-down test. Using a special 
tester  and compressed air,  each cylinder, in turn, is pressur- 
ized.  The rate at which  the air  leaks out  of the  cylinder,  as well 
as where  the air leaks out,  can accurately pinpoint  the magni- 
tude  and location  of the  leakage. 
Before  attempting any  repair that requires major engine dis-...

11 3-9 
Cylinder Head Removal and Installation 
< Remove left and  right interior ventilation ducts  (left  shown): 
Release ventilation filter cover latch  (A) and remove  cover. 
Release  plastic locking tab 
(6) or release locking  tabs on 
top  of duct  (later models). 
Rotate duct counterclockwise  to unlock from bulkhead and 
remove  (arrow). 
Disconnect electrical connector from  hood switch 
(C). 
Release  spring lock (D). 
Slide filter  housing away from inner fender to  remove. 
Removal of...

113-10 
Cylinder Head Removal and Installation 
4 Working above engine,  disconnect the following: 
Vent  line from  cylinder  head cover 
(A). 
. Oxygen sensor connectors (B). 
Electrical harness connector from  VANOS solenoid 
valve 
(C). 
Electrical harness connectors at throttle  valve position 
switch 
(D), ASC  valve  position  switch (E), fuel injector har- 
ness 
(F) and  vent  valve (G). 
CAUTION- 
Be sure  to mark  oxygen  sensor harness  connectors so that 
they  can be reassembled correctly...

.. 
Cylinder Head Removal  and Installation 1 
< Remove intake throttle valve  and ASC  throttle  assemblies: 
Disconnect ASC  throttle cable 
(A). 
- Remove ASC throttle  housing mounting fasteners (B). 
NOTE- 
It is  not  necessary  to disconnect  coolant hoses (C) 01 
bowden cables (D). 
Remove intake  throttle housing mounting hardware,  pull 
throttle  housing  off 
intake manifold, and  set aside. 
- Working  under intake manifold, disconnect  the following: 
Engine oil dipstick tube support. 
Oil...

- 
Cylinder Head Removal  and Installation c 
q Remove secondary  air inject~on check  valve (arrow). 
4 Remove cylinder  head top cover: 
Remove  plastic trim  caps (arrows). 
Remove engine oil filler cap. 
Remove cover  hold down fasteners  and lift off  cover. 
4 Remove  ignition coils: 
Disconnect  ignition coil  harness connectors. 
. Remove coil mounting  fasteners. 
Remove coils. 
Remove  ground straps. 
NOTE- 
Make note of ground  wire at mounting studs  arrangement 
during removal. 
- Remove...

- - , -. I Cylinder Head Removal and lnstallatio~ 
4 Remove oil baffle  cover from  above intake camshaft. 
4 Unscrew  and remove  three cylinder  head cover studs (ar- 
rows) 
at  rear  of cylinder  head. 
Set  engine  to approximate  top dead center 
(TDC) by turning 
crankshaft  bolt in direction  of rotation (clocltwise when 
viewed  from front  of engine) until camshaft  lobes for cylinder 
1 face each  other (dotted lines) and arrows  on camshaft 
sprocltets face up. 
- Set  engine  to TDC by...

11 3-1 4 
Cylinder Head Removal and Installation 
4 Secure camshafts in  TDC position using BMW special tool 
set 
11 3 240. 
4 Remove  access plugs  from VANOS  control unit in front  of 
exhaust camshaft  sprocket. 
Remove 
4 bolts (arrows) from  exhaust  camshaft sprocket 
(Torx E10). 
CAUTION- 
Hold the camshaft stationary  (at hex on  camshaft)  when loos- 
eninq or tiqhteninq sprocl(et mounting  fasteners. r 
Press down on secondary chain tensioner  and lock into place 
using 
BMW special tool 11...

Cylinder Head Removal and Installation / - 
< Use a spanner tool to  rotate exhaust sprocket  until stop on in- 
take  sprocket is contacted. 
- Slide  VANOS  control unit forward  to remove 
Remove  primary chain tensioner  (arrow) 
WARNING - 
Remove tensioner slowly - it is under spring  pressure. I 
- Working at the intake side  of cylinder 1 : 
Detach electrical harness connector  for camshaft position 
sensor and  remove sensor. 
Detach electrical harness connector  for coolant  tempera- 
ture...

113-16 
Cylinder Head Removal and Installation 
- Remove  secondary  timing chain and sprockets: 
Remove  mounting  nuts from front  of intake  camshaft 
sprocket.  Remove  and  label shim. 
CAUTION- 
Hold the camshaft stationary (at hex  on camshaft) when loos- 
ening or tightening sprocket mounting  fasteners. 
Remove  mounting  nuts from front  of exhaust  camshaft 
sprocket  and remove  and label  thrust washer. 
NOTE- 
Where applicable,  make note of thrust washerpositions.  The 
thicker 
(0.4 mm)...