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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Sat Apr 25, 2020 6:52 am Post subject: M38 Distributor |
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Just bought my first timing light.
So I made up a lead with a std plug and took a reading which suggested the timing is out a little.
TM 9-8012. After I have checked the points which had closed a little I moved onto the distributor. I see looking underneath there is a brass screw, a fixed bolt and a bolt in an adjustable slot.
The manual says to loosen the mounting clamp screw under the distributor and turn the unit until the timing marks appear together, then tighten the screw.
Question.Which do you have to loosen to allow the unit to move and adjust? The one in the slot looks most likely.
Did not want to jump in with both feet on this one! _________________ 1952 M38 |
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Sun Apr 26, 2020 5:01 am Post subject: |
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Just found a nice photo by Wes 12-2006 to show the adjuster bolt only needs to be loose to make the adjustment. Its all there if you look. _________________ 1952 M38 |
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Mon Apr 27, 2020 10:28 am Post subject: |
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Managed with the timing light to set it on 5 Degrees before TDC but its very close to full adjustment on the distributor slot.
It would be interesting to know how far along the slot the adjusting bolt normally sits, you would have thought somewhere in the middle so you can adjust either way. Unless I need the oil pump timing ! _________________ 1952 M38 |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16260 Location: Wisconsin
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Mon Apr 27, 2020 3:52 pm Post subject: |
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Thanks, I had seen all the work you had put in and thought that might be the case.
Even though I have got the correct timing marks with the light when running would you still change the orientation of the oil pump?
So the distributor would end in the middle area of the adjuster or close. _________________ 1952 M38 |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16260 Location: Wisconsin
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Tue Apr 28, 2020 1:10 am Post subject: |
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Hi,I have seen the one you posted pulling the paper from the points as they open to get the timing at 5 BTC but will look into the Dwell. I think I have a old meter which had a Dwell scale. Both good to cross check my results. _________________ 1952 M38 |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16260 Location: Wisconsin
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Tue Apr 28, 2020 2:13 am Post subject: |
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Nice bit of kit. How would yo use a Dwell meter on an M38 as the coil is enclosed and the instructions I have seen are for vehicles with easy to reach coils? _________________ 1952 M38 |
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Tue Apr 28, 2020 2:45 am Post subject: |
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So bit more reading. Disi cap off plugs out. Dwell meter cable on positive side of coil and other cable to ground.
Turn engine over with starter and read the Dwell angle on the meter, for a 4 cylinder engine a reading of 60 would be in range. Adjust points as required.
Would that be close to the procedure? _________________ 1952 M38 |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16260 Location: Wisconsin
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Tue Apr 28, 2020 3:26 pm Post subject: |
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Thanks Wes looks like I could do with a bit more kit.
As its running okay I will leave well alone.
Thanks for the offer for the instructions, will keep looking at shows for this unit ,if one turns up when we get out of lockdown. _________________ 1952 M38 |
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rgmutchler Member
Joined: Sep 28, 2008 Posts: 345 Location: Caldwell, Texas
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Posted: Tue Apr 28, 2020 6:01 pm Post subject: |
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I don't know the state of your M38, if you are putting it together after a frame off type rebuild, but if you don't have the generator on your engine yet you might want to check and make sure that the distributor won't interfere with it when you time the engine. Due to the size of the waterproof distributors the indexing of the oil pump and distributor can be critical in having enough room to turn the distributor to time it. Don't know if it applies in your case but just FYI. _________________ R G Mutchler
M274A5
M-38 MC13312
http://willysmjeeps.com/v2/modules.php?set_albumName=rgmutchler&op=modload&name=gallery&file=index&include=view_album.php |
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Wed Apr 29, 2020 1:03 am Post subject: |
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Hi, thanks for the input. Yes it is all together, there was just enough room on the adjuster to give me the correct timing so I will leave it at that. In the future it is something I would like to check if any major parts need replacement. _________________ 1952 M38 |
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horse Member
Joined: Sep 08, 2019 Posts: 196 Location: Yorkshire U.K.
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Posted: Wed Apr 29, 2020 6:36 am Post subject: |
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Just on a finishing note with the adjusting slot being at one end anticlockwise .I had another look today with a tiny camera and found the distributor bolt adjuster is nicely in the middle of the arc, so pleased with that.
Once I have found out how to post photos with a Mac I will pop one up. _________________ 1952 M38 |
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