3406b timing specs - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 08-27-2016, 02:26 AM Thread Starter
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3406b timing specs

4mg93944 timing with meter am I doing this correctly I really am not understanding the start screw meaning when I see the timing starting to advance from a idle and not from a set rpm as stated in posts could someone explain this or have I got a problem. Advance is rebuilt and stop screw is removed. the following is what it started with pin timed and then start screw turned out 5 turns and then another 5 turns. This is in my personal mechanics truck and am trying to get a little better fuel mpg but don't want to melt it down, truck weights about 52000.

5 turns out 5 more turns out
660 18.6 18.6 18.6
1000 19.2 19.2 19.2
1250 19.6 19.6 19.6
1450 19.7 19.7 20.4
1600 20.2 20.2 22.8
1800 21 23.5 25.6
1900 22.3 24.5 26.8
2000 23.4 26 28.2
2100 24.9 27.2 29.7
2200 26.5 28.8 31
2300 28.5 30.3 32.5
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post #2 of 6 (permalink) Old 08-27-2016, 04:03 PM Thread Starter
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is the start screw adjustment where the timing starts to advance ?
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post #3 of 6 (permalink) Old 08-27-2016, 05:11 PM
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Yes, what engine is this? 4MG with 18* cam?
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post #4 of 6 (permalink) Old 08-28-2016, 07:58 PM Thread Starter
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Hello Smokin yes that's it. What do the readings look like to you. According to SIS the start RPM is 1450.
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post #5 of 6 (permalink) Old 08-28-2016, 09:04 PM
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The second set of specs you listed look pretty good other than the starts a bit low. Only way to get it exactly where it needs to be now is start over and advance the static timing 2 and start over on you start and stop screw adjustments

Larry
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post #6 of 6 (permalink) Old 08-30-2016, 01:49 PM Thread Starter
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Thanks for the reply's folks gotta had to go check out a trans problem on cat scraper so im gonna run it like this till i get a chance to play with it some more.
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