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239 Ignition Timing

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Old 06-20-2013, 07:11 AM
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239 Ignition Timing

Hi,

I am trying to get my 239 OHV up and running. But the mechanic that is going to help me doesn't know anything about Y blocks.

He needs to know the following:

1) Cylinder locations 1-8
2) Cylinder locations on Distributor cap
3) Distirbutor rotation (CW or CCW)
4) Tune Up Specs (points gap, dwell gap, spark plug gap ect.)

And anything else that you think is important that I forgot.

Thank You,
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Old 06-20-2013, 08:05 AM
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Old 06-20-2013, 03:54 PM
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Sounds like a good mechanic, and I'm not being sarcastic. It is good that he asks these questions and does not make assumptions.

Cylinder numbering.
So we are on the same page, the water pump is the front, the flywheel is the back, the distributor is the right, the oil pump is the left.
On the right bank, numbered from front to back, 1, 2, 3, 4
On the left bank, numbered from front to back, 5, 6, 7, 8.

Firing order 1-5-4-8-6-3-7-2

The distributor cap probably has a 1 near one of the terminals and that is where #1 should be. From there, follow the firing order, counterclockwise.

I don't remember the tune up specs, but I believe that is typical of any points equipped v8.

For stock cams, valve clearance, .019". About 1/4 turn of the adjuster screw loose from 0 clearance will get you real close.
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Old 06-20-2013, 08:43 PM
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Stock cam valve clearance of .019" will work better .
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Old 06-20-2013, 09:09 PM
charliemccraney charliemccraney is offline
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Yes it will. I knew something wasn't right about that when I typed it. I'll correct it. Talk about a brain fart.
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Old 06-20-2013, 09:28 PM
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Recently I relayed a little formula provided by Ted Eaton on flywheel weight. Said a rule of thumb is 1 lb flywheel per 10 lbs. vehicular weight. Left out the second zero .
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Old 06-22-2013, 08:14 AM
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Here is an image that might be helpful.
It was from this thread: https://www.ford-trucks.com/forums/1...lp-please.html


I'm currently putting together my 239 Y-Block. I'm an amateur so I'm going very slow and asking lots of questions. My thread is in my signature.

Here are the distributor specs from the shop manual:
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Old 06-24-2013, 09:44 PM
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Quote:
Originally Posted by Harrier View Post
Here is an image that might be helpful.
It was from this thread: https://www.ford-trucks.com/forums/1...lp-please.html


I'm currently putting together my 239 Y-Block. I'm an amateur so I'm going very slow and asking lots of questions. My thread is in my signature.

Here are the distributor specs from the shop manual:
Thank You, That is very helpful!!
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Old 07-02-2013, 10:18 AM
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I would recommend getting a shop manual... That is where Harrier got his page of info...

Harrier is rebuilding a '55 239... make sure the specs are the same for a 58, if that is what you are working on.
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Old 07-02-2013, 10:22 AM
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Quote:
Originally Posted by abe View Post
I would recommend getting a shop manual... That is where Harrier got his page of info...

Harrier is rebuilding a '55 239... make sure the specs are the same for a 58, if that is what you are working on.

It's mentioned at the top of the image for 54-59 Ford and 55-57 T-bird

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