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Diesle Timing - Timing Light, Pulse adapter, MT480, MT1480a
Diesel Timing combinations - Timing Light, Pulse adapter, MT480, MT1480a
Well here's what I got...
All information below was taken off one engine - no changes made during test
The number one cylinder was used for all testing. Because this is a van motor the factory pulse adapter connection is on cylinder four which again was not used.
Old cracked probe / MT 480 – bottom line is if your probe is cracked at all it’s no good!
0.5˚ ATDC @ 700 rpm
5.5˚ ATDC @ 1400 rpm
5.0˚ ATDC @ 2000 rpm
New *probe / MT 480
1.0˚ BTDC @ 700 rpm
2.0˚ ATDC @ 1400 rpm
3.5˚ ATDC @ 2000 rpm
New *probe / MT 1480a
1.0˚ BTDC @ 700 rpm
2.0˚ ATDC @ 1400 rpm
3.5˚ ATDC @ 2000 rpm
* I used the same probe for both the MT 480 and MT 1480a
MT 1480a using the MAC pulse adapter ET18DPM
Pulse adapter clamped just above the injector connection
11.5˚ BTDC @ 700 rpm
8.0˚ BTDC @ 1400 rpm
9.5˚ BTDC @ 2000 rpm
Pulse adapter 3 inches away from the injector connection.
11.5˚ BTDC @ 700 rpm
9.0˚ BTDC @ 1400 rpm
10.5˚ BTDC @ 2000 rpm
Strobe or Timing Light - OTC variable offset and MAC pulse adapter ET18DPM. The offset was started at 20˚ so if you want 9.5˚ the timing offset should read 29.5˚.
I wire brushed the dampener timing plate and there does not appear to be a factory mark so I used the relative center of the magnetic pickup as a reference mark.
Pulse adapter clamped just above the injector connection.
**Because of the difficulty reading and judging center of the magnetic pickup I would say that the following numbers are within 1˚
**11.5˚ BTDC @ 700 rpm (timing light offset at 31.5˚)
**8.0˚ BTDC @ 1400 rpm (timing light offset at 28.0˚)
**9.5˚ BTDC @ 700 rpm (timing light offset at 29.5˚)
Pulse adapter 3 inches away from the injector connection.
**11.5˚ BTDC @ 700 rpm (timing light offset at 31.5˚)
**9.0˚ BTDC @ 1400 rpm (timing light offset at 29.0˚)
**10.5˚ BTDC @ 700 rpm (timing light offset at 30.5˚)
Observation: when using the pulse adapter no mater where the pickup was mounted or if I used the meter or light there seems to be a curve between 700 rpm and 2000 rpm. From 700 rpm to 1400 the timing retarded about 3.5˚, and from 1400 rpm to 2000 it advanced 1.5˚
Strobe or Timing Light - OTC variable offset and MAC pulse adapter ET18DPM. The offset was kept at ZERO
Pulse adapter clamped just above the injector connection
It was easier and more accurate to lie on a creeper and look up at the balancer and timing plate while someone adjusted the RPM range. Numbers are very “approximate”…
At 700 rpm (11.5˚) the balancer timing mark was approximately 3/16 of an inch below the bottom of the timing plate (loosely about 2 1/16 inches down from the magnetic pickup hole).
At 1400 rpm (8.0˚) the balancer timing mark was fully visible just below the timing plate.
At 2000 rpm (9.5˚) the balancer timing mark was approximately 1/16th to 3/32nd of an inch from the timing plate.
Comments on using a zero offset timing light: If I was to use a zero offset timing like I would set the rpm to 1400, and strive for a fully visible timing mark just below the timing plate, about 8˚. This should at least give a real good starting point when testing different settings.
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Linear Mode
