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Old 12-28-2020, 12:06 AM   #1
Phil Gillespie
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Unhappy 8BA Style Timing Cover Queries

Have a 69a Engine fitted with 8BA style timing cover.
Running a Chev type distributor.

The cover has a hole in central area which has been closed off with a set bolt and lock nuts. What would have been the purpose of this hole as I see other covers do not have this hole. Oil Supply distributor timing gear??

Also see cover markings:

Pin for timing- C8RT-6059-P Pin is located at this mark.

Lower area- C0BA-6059-?

These 2 choice of locations for timing pin location :
1: Truck Engine. 8RT
2: Car Engine -8BA

DSC06339.jpg

DSC06338.jpg

Appreciate all info for these queries.
Phil NZ
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Old 12-28-2020, 05:32 AM   #2
51 MERC-CT
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Default Re: 8BA Style Timing Cover Queries

My guess is that the hole with the bolt in it is used to satisfy the cover to cam end clearance spec. that would normally be controlled by the dia. shown. Which is probably worn out of spec.


8RT meant to be used with 8RT pulley.
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Old 12-28-2020, 03:09 PM   #3
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Default Re: 8BA Style Timing Cover Queries

Quote:
Originally Posted by 51 MERC-CT View Post
My guess is that the hole with the bolt in it is used to satisfy the cover to cam end clearance spec. that would normally be controlled by the dia. shown. Which is probably worn out of spec.


8RT meant to be used with 8RT pulley.
Appreciate your reply. So it needs to be refitted and not just closed off?
I realize the 8RT is meant to be used with 8RT pulley, But my query was about the ability to have the timing pointer at the upper location where it is now or located at the lower location. This obviously alters timing setting dependant on 8BA or 8RT set up?

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Old 12-28-2020, 03:32 PM   #4
V8 Bob
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Default Re: 8BA Style Timing Cover Queries

The 2 degree BTDC timing remains the same with the pointer in either location.
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Old 12-28-2020, 03:34 PM   #5
tubman
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Default Re: 8BA Style Timing Cover Queries

I don't think that hole should be there on a stock Ford cover. I have never seen one (which doesn't mean much), but it is drilled right through the last character of the cast in part number. I don't think Ford did that.

I am not familiar with the Canadian numbering systems, but if that 8BA type timing cover is on an earlier engine, the hole may be an attempt at controlling cam thrust.
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Old 12-28-2020, 03:53 PM   #6
Phil Gillespie
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Default Re: 8BA Style Timing Cover Queries

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Quote:
Originally Posted by V8 Bob View Post
The 2 degree BTDC timing remains the same with the pointer in either location.
I have trouble understanding this one. If this is correct what is the point of the 2 different locations for pointer then.
Thanks
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Old 12-28-2020, 03:57 PM   #7
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Default Re: 8BA Style Timing Cover Queries

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Originally Posted by tubman View Post
I don't think that hole should be there on a stock Ford cover. I have never seen one (which doesn't mean much), but it is drilled right through the last character of the cast in part number. I don't think Ford did that.

I am not familiar with the Canadian numbering systems, but if that 8BA type timing cover is on an earlier engine, the hole may be an attempt at controlling cam thrust.
I'm sure that hole should not be there also as per above.
As for the fitting of this bolt in this location it seems feasible and will refit when time to assemble and check on set up.
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Old 12-28-2020, 04:50 PM   #8
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Default Re: 8BA Style Timing Cover Queries

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Originally Posted by Phil Gillespie View Post
I have trouble understanding this one. If this is correct what is the point of the 2 different locations for pointer then.
Thanks
Phil NZ

I think it has to do with the diameter of the pulleys.
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Old 12-28-2020, 05:10 PM   #9
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Default Re: 8BA Style Timing Cover Queries

Would that not be an original ford part ,it has the Alcan name on it, not ford
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Old 12-28-2020, 05:34 PM   #10
51 MERC-CT
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Default Re: 8BA Style Timing Cover Queries

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Originally Posted by Phil Gillespie View Post
I'm sure that hole should not be there also as per above.
As for the fitting of this bolt in this location it seems feasible and will refit when time to assemble and check on set up.
Phil NZ
My US cover has identical markings (so yours does not look Canadian)
Check the end play dim. of the cam without the cover gasket to see what you are dealing with.
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Old 12-28-2020, 05:57 PM   #11
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Default Re: 8BA Style Timing Cover Queries

On my french Flathead there is a screw and locknut to adjust endplay of cam.
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Old 12-28-2020, 05:58 PM   #12
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Default Re: 8BA Style Timing Cover Queries

As 51 Merc noted check the cam to cover end play. If its excessive that would explain why someone drilled that hole which could be used to hold some type of thrust limiting device.

Your cover has another item of concern I see some welding has been done on the inside surface of the cover at the location of the lower distributer support hole. This hole is important on how the distributer is located. It would be best to check how the distributor fits in the cover and that the shaft turns with out binding when its in that lower hole.
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Old 12-28-2020, 06:26 PM   #13
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Default Re: 8BA Style Timing Cover Queries

Quote:
Originally Posted by Phil Gillespie View Post
I have trouble understanding this one. If this is correct what is the point of the 2 different locations for pointer then.
Thanks
Phil NZ

The cast iron narrow belt stepped pulley used on '50-'53 Ford/Merc cars measures about 6 1/16" in diameter and uses the lower pointer location. Trucks and '49 Ford/Merc cars used a sheet metal wide belt pulley that measures about 6 3/4" at the rear and uses the upper pointer location.
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Old 12-28-2020, 07:04 PM   #14
Phil Gillespie
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Default Re: 8BA Style Timing Cover Queries

Quote:
Originally Posted by 51 MERC-CT View Post
My US cover has identical markings (so yours does not look Canadian)
Check the end play dim. of the cam without the cover gasket to see what you are dealing with.
Yes will check the cam end play prior to fitting of timing cover to see where its at.
Phil NZ
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Old 12-28-2020, 07:08 PM   #15
Phil Gillespie
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Default Re: 8BA Style Timing Cover Queries

Quote:
Originally Posted by Ronnieroadster View Post
As 51 Merc noted check the cam to cover end play. If its excessive that would explain why someone drilled that hole which could be used to hold some type of thrust limiting device.

Your cover has another item of concern I see some welding has been done on the inside surface of the cover at the location of the lower distributer support hole. This hole is important on how the distributer is located. It would be best to check how the distributor fits in the cover and that the shaft turns with out binding when its in that lower hole.
Ronnieroadster
Yep will ckeck as suggested. There will be another cam being fitted so will check all. The chev distributor was originally running with the timing cover.
Phil NZ
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Old 12-28-2020, 07:11 PM   #16
Phil Gillespie
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Default Re: 8BA Style Timing Cover Queries

Quote:
Originally Posted by V8 Bob View Post
The cast iron narrow belt stepped pulley used on '50-'53 Ford/Merc cars measures about 6 1/16" in diameter and uses the lower pointer location. Trucks and '49 Ford/Merc cars used a sheet metal wide belt pulley that measures about 6 3/4" at the rear and uses the upper pointer location.
Thank you all is clear now.
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