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Old 07-23-2019, 03:30 PM   #1
Tim Brown
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Default Help! Why is there excess oil in a crab dist?

Heres the deal, 49-53 merc block, 59A style cam and crab 2 bolt dist.

Every time we drive the car (34 3w) for a short while, the crab cap and rotor get bathed in motor oil fouling the electrical system.

More info: 59A style intake with fuel pump and breather mounted above.

Any ideas on this one?

Stumped...
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Old 07-23-2019, 05:41 PM   #2
BUBBAS IGNITION
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Default Re: Help! Why is there excess oil in a crab dist?

I get this quite a bit, as there isnt any main feed of oil to the timing cover , i think its got to be crankcase pressure caused by lack of ventilation. Check fresh air vent etc... Try removing the vacuum brake line for testing as well........
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Old 07-23-2019, 06:12 PM   #3
Tony, NY
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Default Re: Help! Why is there excess oil in a crab dist?

Check out this old thread. You may find some answers.
https://www.fordbarn.com/forum/showthread.php?t=146772
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Old 07-23-2019, 06:15 PM   #4
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Default Re: Help! Why is there excess oil in a crab dist?

Somebody can check me on this.......seems 59A timing gears cut opposite to 8BA gears so that one set moves oil opposite of the other set?

Which gearset do you have Tim?
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Old 07-23-2019, 06:33 PM   #5
Tim Brown
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Default Re: Help! Why is there excess oil in a crab dist?

I’m also wondering if there could be too much oil in it. It’s got a full flow conversion on it and unknown origin of the dipstick.
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Old 07-23-2019, 06:44 PM   #6
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Default Re: Help! Why is there excess oil in a crab dist?

Don't use the dipstick to determine initial oil level. Dain the oil and add five qts. Check it with the dipstick and see where it is at. Mark the dipstick at the 5qt level.

Last edited by JSeery; 07-23-2019 at 08:47 PM.
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Old 07-23-2019, 08:12 PM   #7
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Default Re: Help! Why is there excess oil in a crab dist?

Quote:
Originally Posted by JSeery View Post
Don't use the dipstick to determine initial oil level. Dain the oil and add five qts. Check it with the dipstick and see where it is at. Mark the dipstick at the 5qt levels.
Thatís where it is right now.
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Old 07-23-2019, 08:47 PM   #8
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Default Re: Help! Why is there excess oil in a crab dist?

Ok, I'm confused. Thought you stated that the dipstick was of unknown origin. If you know the dipstick is correct then why the concern of being overfilled?
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Old 07-23-2019, 10:05 PM   #9
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Default Re: Help! Why is there excess oil in a crab dist?

If you examine the timing cover you should find 2 little oil holes in the recess for the distributor; one at top to let oil in, and a larger one at the bottom to allow oil to drain back into engine. Check that the return hole is open....
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Old 07-23-2019, 10:13 PM   #10
Tim Brown
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Default Re: Help! Why is there excess oil in a crab dist?

Quote:
Originally Posted by JSeery View Post
Ok, I'm confused. Thought you stated that the dipstick was of unknown origin. If you know the dipstick is correct then why the concern of being overfilled?
Sorry for the confusion. I have 5 quarts in it and put a new mark on the dipstick.
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Old 07-23-2019, 11:10 PM   #11
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Default Re: Help! Why is there excess oil in a crab dist?

What Brian said x2. Also, is there too much clearance in the back bushing?
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Old 07-24-2019, 01:14 AM   #12
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Default Re: Help! Why is there excess oil in a crab dist?

I had it a couple of times when people havenīt understood that the bushing absorbs oil and have drilled oil holes through it...
Or someone took the oilwick inside the shaft out while cleaning...
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Old 07-24-2019, 09:42 AM   #13
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Default Re: Help! Why is there excess oil in a crab dist?

Quote:
Originally Posted by Tim Brown View Post
Heres the deal, 49-53 merc block, 59A style cam and crab 2 bolt dist.

Every time we drive the car (34 3w) for a short while, the crab cap and rotor get bathed in motor oil fouling the electrical system.

More info: 59A style intake with fuel pump and breather mounted above.

Any ideas on this one?

Stumped...
Is this a newly built engine? What is the oil pressure like?
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Old 07-24-2019, 10:02 AM   #14
Tim Brown
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Default Re: Help! Why is there excess oil in a crab dist?

Thanks everyone. I’ll have a look at it tomorrow evening and report back ... T
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Old 07-24-2019, 03:57 PM   #15
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Default Re: Help! Why is there excess oil in a crab dist?

Another thing to look at, a high pressure oil pump could override the relief valve in the valley ,the valve opens occasionally to lube the timing gears and the back of the distributor ,Most distributors that I have worked on do not have holes drilled at the rear bush possible to reduce this problem .
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Last edited by FlatheadTed; 07-24-2019 at 04:03 PM.
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