Vanagon F4-1970cc 2.0L (1982)
Distributor Advance Unit: Testing and Inspection
CAN/USA, Not California
With Siemens 451 Tester or Equivalent
Ignition distributor, checking centrifugal advance with SIEMENS 451 tester or equivalent
Work sequence
-
connect tester according to manufacturer's instructions
-
start engine and run at idle
ignition timing and rpm will register directly on tester
-
adjust idle speed if necessary
manual: 800 - 950 rpm
automatic: 850 - 1000 rpm
-
pull hose off vacuum unit
-
adjust ignition timing if necessary
-
note advance angle on test instrument (basic advance angle)
Note: Start of centrifugal advance is shown by increasing advance angle registered on test instrument while increasing rpm
-
increase engine speed slowly to 1600 rpm
-
read off advance angle on test instrument
Note To determine centrifugal advance, subtract basic advance angle from last advance angle measured
Example: last advance angle measured (-) minus basic advance angle (=) centrifugal advance
-
repeat check at 3400 rpm
-
reconnect vacuum hose when test is completed
With Timing Advance Tester
Ignition distributor, checking centrifugal advance with timing advance tester
Work sequence
-
connect tester according to manufacturer's instructions
-
start engine and run at idle
manual: 800 - 950 rpm
automatic: 850 - 1000 rpm
-
pull off hose at vacuum unit
-
check ignition timing and adjust if necessary
-
flash ignition timing scale with timing light and note indicated angle (basic angle)
Note: Start of centrifugal advance is shown by movement of notch while increasing rpm
-
increase engine speed slowly to 1600 rpm