3.9 Timing Check - Defender Source
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Old October 25th, 2012, 03:57 PM
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Martin
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3.9 Timing Check

Where do I aim the timing light on a 3.9? Anybody want to give me a quick 123 on it as I've never done it? It's a RRC but assume it's the same as the defender? Thanks.
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Old October 25th, 2012, 08:20 PM
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chris
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its not easy .... i recommend marking the balancer to give you a 1/2 a chance on seeing it .. you have to aim the light a bunch of different ways while looking between the inside of the p/s bracket and the water pump
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Old October 25th, 2012, 08:57 PM
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Bill Adams
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Ha! trick question! You can't aim the timing light AND see the mark at the same time.
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Old October 25th, 2012, 09:21 PM
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Ive never had a problem, either on v belt or serp belt trucks... but I always take some sandpaper and clean up the marks on the balancer first, then mark the spot that I want to line up to with paint.

If you are having a lot of trouble, warm the truck up, then pull the fan/shroud off and you don't have to be nervous about losing a finger or two in the process.
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Old October 25th, 2012, 10:07 PM
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Trevor K
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It's also not possible to do it in anyplace but a dark room while wearing night vision googles
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Old October 25th, 2012, 11:21 PM
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Martin
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Thanks for the replies. As with most things, it sounds more difficult than I thought it would be!
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Old October 26th, 2012, 03:00 PM
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Martin
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Ok so I think I got it read correctly.

9.6 BTDC. Now, how do I actually adjust it say if I wanted to get it to 5-6? Manual says "loosen distributor clamp bolt" but it would help to know where that is on the distributor. Do I have to pull the cap off first? And then once the bolt is loose, what do I actually rotate and in which direction?

Thanks!
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Old October 26th, 2012, 04:43 PM
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the bolt is to the right of the distributer shaped like a Y that clamps down on the base.... think its a 15mm
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Old October 26th, 2012, 06:29 PM
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Very little room, I cut a spanner in half in order to get to it.
Loosen just enough to allow rotation of the dizzy, also bring the motor to temp and remove and plug the vacuum line going to the dizzy, then set timing.
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