Troubleshooting - Honda CX500 1978 Shop Manual

HONDA
CYLINDER HEADIVALVE
CX500
SPECIFICATIONS
I 1
Standard
1
Service Limit
I
Shafts and holders
11.5 kg137.9 mm
10.5 kgl37.9 mm
Inner (EX)
(25.4 lbs/1.492 in.) (23.2 lbsl1.4921 in.)
(IN)
6'590 mm
6.54 mm (0.2575 in.)
(0.2591-0.2594 in.)
Stem O.D.
,-.,.
6.550- 6.560 mm
, .
-.
'7.2565 in.)
I
t t X l
!
(0.2579-0.2583 in.)
!
'"'
mm "
TROUBLESHOOTING
Valves and
valve guides
Cylinder head
Engine top-end problems are usually performance related which can be diagnosed by a compression test, or are noises which
can usually be traced to the top-end with
a
sounding rod or stethoscope.
Low Compression or Uneven Compression
1. Valve
Incorrect valve clearance
Burned or bent valves
-
Broken valve spring
lncorrect valve timing
Sticking valve
2. Cylinder head
Leaking or damaged head gasket
Warped or cracked cylinder head
3. Cylinder and piston
Guide I.D.
-
Stemto-guide
clearance
High Compression
1. Excessive carbon build-up on piston crown or combustion
chamber
Excessive Noise
1. lncorrect valve adjustment
2. Sticking valve or broken valve spring
3. Damaged rocker arm or camshaft
4. Bent push rod
Contaminated Engine Oil or Coolant
1. Leaking head gasket
(IN)
(EX)
(IN)
(EX)
6-2
Date of Issue: January, 1978
OHONDA MOTOR CO., LTD.
Valve seat width
Waroaae
6'6000-6'6200
mm
(0.2598-0.2606 in.)
6.6000-6'6200 (0.2598-0.2606 mm in.)
6.70 mm (0.2638 in.)
6.70 mm (0.2638 in.)
0.10 mm (0.040 in.)
0.10 mm (0.040 in.)
1.1-1.3 mm
(0.04-0.05 in.)
-
2.0 mm (0.08 in.)
-
0.10 mm (0.040 in.)