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Old 03-30-2013, 02:18 PM
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Weird Oil Leak

I have a rebuilt SB 350 that I did myself a while back. Was using 20-50W oil and never had a leak. I just changed my oil 2 weeks ago to a little bit thinner oil and now I keep having an oil leak somewhere around the fuel pump. The problem is, I cannot see where it is leaking!! It doesn't leak when idling or if I rev it some and then check it. But if I drive it and get up around 50-55 it leaks alot and gets on my headers and all down around the passenger side of the motor and suspension. I don't get it!! Anyone have any ideas? It is driving me nuts!!

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Old 03-30-2013, 02:26 PM
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sounds like valve covers,to get onto the headers
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Old 03-30-2013, 02:27 PM
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Shouldn't there be visible oil on the engine below the valve covers, like a run or something?
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Old 03-30-2013, 02:34 PM
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oil does not usually go up? the fuel pump is well below the primary tubes.Use some Brake Cleens to wash the engine and drive again.If its still not visible,buy some dye from a local auto parts store
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Old 03-30-2013, 02:41 PM
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I guess I should have been more clear. The oil is getting on the headers where it collects down lower, almost where it bolts to the exhaust pipe. When driving at lower speeds it doesn't leak as much. Also, my oil pressure really drops when the engine is warm and about 5-10 when idling. When cold, I have 50-60 at idle and 75 when driving.
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Old 03-30-2013, 02:53 PM
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check the back of the intake,common leak
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Old 03-30-2013, 02:55 PM
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Make sure PCV and breathers are working properly. Also check weephole in side of fuel pump.
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Old 03-30-2013, 03:02 PM
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Quote:
Originally Posted by Richiehd View Post
Make sure PCV and breathers are working properly. Also check weephole in side of fuel pump.
Good point. I rebuilt a 350 and when I initially installed it in my Model A ity didn't have a pcv valve or breathers. It eventually built too much crankcase pressure and it blew oil out of the fuel pump gasket and it went all over the headers.
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Old 03-30-2013, 03:46 PM
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There is a 3/8" thread ended hole at the front of the block right in front of the fuel pump. When installing the fuel pump, you can screw a bolt into it to 'grab' the pump push rod and stop it from slipping down, for ease of pump installation. Make sure ths hole is plugged with a short bolt to stop oil weeping out. Be sure to use a very short bolt a the hole is only 3/4" deep.. If too long a bolt is used, it will foul on the rod.



Duke
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Old 03-30-2013, 04:10 PM
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I have a similar leak. my valve covers don't have any holes for PCV. Should I just drill holes and make PCV or buy new covers?

I have a breather on the passenger side cover could pressure stil be the cause of the leak because on the drivers side cover there is only the oil cap with no breather.
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Old 03-30-2013, 04:58 PM
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You need a pcv 10 yearguy.
A breather on one cover and a pcv on the other
The oil cap can be replaced with a cap like this if you don't want to change valve covers. They come in twist on or push on style.
68 69 70 71 Ford Mercury Oil Cap Stant 10071 Crankcase Breather Cap | eBay.
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Old 03-30-2013, 05:08 PM
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Thanks.

I've heard so many different opinions on PCV (necessary or unnecessary) but now that I'm leaking some oil I'm going to try one out as in my mind it makes sense.

But the link you sent was for a breather. I already have a breather on pass side. What did you suggest for drivers side?
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Old 03-30-2013, 06:00 PM
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I have a PCV and a breather installed. They are Vortec heads and had the holes already in them. Could the PCV have gone bad and cause this? I will try and check the weep hole thing you mentioned. Any pictures of what to look for? I am not sure what to look for.
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Old 03-30-2013, 06:05 PM
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Quote:
Originally Posted by vinniekq2 View Post
oil does not usually go up? the fuel pump is well below the primary tubes.Use some Brake Cleens to wash the engine and drive again.If its still not visible,buy some dye from a local auto parts store
Oil will go 'up' at 55mph if its leaking from the fuel pump pushrods retaining bolt hole at the front of the block, if the hole is left 'open'. I've seen it many times.
It's not an uncommon oversight.

Duke
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Old 03-30-2013, 06:09 PM
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Quote:
Originally Posted by RWENUTS View Post
You need a pcv 10 yearguy.
A breather on one cover and a pcv on the other
The oil cap can be replaced with a cap like this if you don't want to change valve covers. They come in twist on or push on style.
68 69 70 71 Ford Mercury Oil Cap Stant 10071 Crankcase Breather Cap | eBay.
Ok I thought this through. Just let me know if I'm off here. Push style breather brings air in on pax side and PVC has hose connected to carb vacuum line to recirculate the blow by or "dirty gasses"
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