There seems to be a discrepancy to as where the mark on the damper should
be. Some people say the damper should be right on the TDC mark (like KRC's
write-up) while others say it needs to be advanced to the V8/V6 mark on the
damper. If the procedure below is as per DC, what's the difference when
going by the actual TDC mark and not the V8/V6 mark? Can this have an
adverse affect?
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bernd D.
Ratsch
Sent: Sunday, June 13, 2004 9:17 AM
To: dakota-truck@dakota-truck.net
Subject: DML: Setting Distributor Drive Timing (Fuel Sync) without DRB
This is a base setting for those without a DRB or other scanner that shows
Fuel Sync...but you still should have it checked for proper setting on Fuel
Sync. Correct procedure from DC as well.
Distributor Indexing
SYMPTOM/CONDITION:
Vehicles may exhibit surging, light bucking, or intermittent engine
misfiring. This will most likely occur when the vehicle is at operating
temperature, and under a light load at approximately 2000 RPM. This
condition may be caused by a mis-indexed distributor. The following
procedure is an alternative to the indexing procedure outlined in the
service manual.
REPAIR PROCEDURE:
This procedure outlines an alternative distributor indexing procedure.
Connect a voltmeter to the distributor sensor connector by removing the end
seal and carefully back probing the connector. Connect the positive lead to
the sensor output pin (pin 3, either a tan wire with a yellow tracer or a
gray wire, depending on vehicle application). Connect the negative lead to
the sensor ground pin (pin 2, a black wire with a light blue tracer).
Rotate the engine clockwise as viewed from the front, until the number one
piston is at Top Dead Center (TDC) of the compression stroke. The timing
mark on the vibration damper should line up with the zero degree (TDC) mark
on the timing chain case cover.
Continue to rotate the engine slowly clockwise until the V6 or V8 mark
(depending on engine type) lines up with the zero degree (TDC) mark on the
timing chain case cover. The V8 mark is 17.5°after TDC and the V6 mark is
147°after TDC. NOTE: DO NOT ROTATE THE ENGINE COUNTER CLOCKWISE. IF THE
ENGINE IS ROTATED BEYOND THE MARK, RETURN TO STEP 2 AND REPEAT THE
PROCEDURE.
Loosen the distributor clamp bolt.
With the ignition switch in the ON position, rotate the distributor slightly
in either direction until the voltmeter switches between the sensor
transition point of 0 and 5 volts.
Adjust the distributor as close as possible to either side of this
transition point and tighten the distributor clamp bolt to 19-26 N-m
(170-230 in.lbs.) .
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