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willysmjeeps.com :: View topic - M38A1 - setting proper timing.
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M38A1 - setting proper timing.

 
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pduske
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Joined: Feb 01, 2006
Posts: 30

PostPosted: Sun Jun 07, 2020 1:32 pm    Post subject: M38A1 - setting proper timing. Reply with quote

Hi fellows,

I am facing the following problem:
- I installed a rebuild distributor built from nos parts.
- using a stroboscope lamp, running with approx 800rpm, I turned the distributor clockwise. But even when reached the maximum possible angle (the distributor housing then is horizontal) I do not reach the 5° marking on the housing.

- Interestingly the wires are not positioned as they should:

https://drive.google.com/uc?export=download&id=14FyGKSasy-6zCie3sekMC6iKDNF9bhwi

Would it help to switch wire "1" to wire "3" counterclockwise and simultanelously turn the distributor counterclockwise also? I should be able to reach the 5° tdc marking then, correct?

Or what is the best way to reach 5° befor tdc?

I appreciate your help!

Philipp
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Ramsey 50R setup
USMC spec. PowrLok front & rear
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Sun Jun 07, 2020 10:41 pm    Post subject: Reply with quote

Philipp,

First the oil pump must be indexed correctly with #1 piston TDC on compression since the oil pump is driven by the cam and the oil pump drives the distributor. This is the most overlooked step in final engine assembly on this planet. It is not that critical on civilian jeeps because they use a distributor with a small round housing. The much larger oval housing of the military distributor will contact the block before it can be rotated far enough to set timing correctly if the oil pump is not first indexed correctly.



Second the cap wire sequence is incorrectly illustrated in TM 9-8014 Fig 79.




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Eades
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Joined: Jul 10, 2018
Posts: 97
Location: Western Washington

PostPosted: Mon Jun 08, 2020 11:41 am    Post subject: Reply with quote

I attempted to set it close before I ever started mine. My engine had been rebuilt and never ran. I could not get close to the proper setting. I realized the oil pump shaft was set 180 degrees opposite of correct. Off came the pump, turned the shaft 180, and good to go.

Yours is probably indexed incorrectly. Follow the TDC instructions to find out.
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1951 M38 & 1967 M715
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