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Oil return passage slow?

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Oil return passage slow?

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Old

Sep 22, 2008 | 10:04 AM

#1

MikeWire

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From: Laurel, MT

Oil return passage slow?

I am just about finished with my rebuild and I was testing my new oil pump and I see my rear drivers side oil return passage is slow to drain. Turning the dizzy (without the gear on) by hand pumps oil up and out over the rockers, but the drain is slow enough that it starts to back up and pour off the edge of the head (I have the VC's off). The other side seems to drain faster - is this typical and is it something I need to be concerned about? What could be slowing the return?

BTW, oiling looked great except that slow return.

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Sep 22, 2008 | 10:55 PM

#2

Thunderjet4x4

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Possible blocked return-run a piece of wire down it-and hope you don't knock some crap into the pan.
Another possibility is that the headgasket is on wrong? Eeep!
Good luck.

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Sep 23, 2008 | 12:02 AM

#3

MikeWire

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From: Laurel, MT

Quote:

Originally Posted by Thunderjet4x4

Possible blocked return-run a piece of wire down it-and hope you don't knock some crap into the pan.
Another possibility is that the headgasket is on wrong? Eeep!
Good luck.

Thought about that - I am able to put a long piece of cable down the hole with no binding or bending, and I do see oil draining, but it's slower than the front hole, and slower than the passengers side. I also blew some comp air and I could hear it circulating OK. HG is on correctly - I triple checked it before bolting the head, so I don't think that's the problem.

The heads and block were hot tanked and washed out, and I saw no obstructions - is it possible that this oil return is just slower in the FE? Any other ideas?

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Sep 23, 2008 | 08:28 AM

#4

fastfarmer

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From: southwest Wisconsin

FEs tend to pump more oil up to the valve train than is needed. Many folks - including me - restrict the oil to the top end by removing the rocker shafts and slipping a Holley #80 main jet into the oil passage that feeds the valve train, located under the stand second from the front on the driver side, second from the rear on the pass side. Fits perfectly, prevents oil from flooding the top end.

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Sep 23, 2008 | 09:31 AM

#5

MikeWire

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From: Laurel, MT

I have heard of people mentioning that in other threads and now I know why - I was turning the dizzy by hand and it was pumping a ton of oil. So the #80 jet just sits in the bottom of the oil passage? So, just unbolt the bolt, pop a jet in and bolt it back up? sounds all too simple...

I don't know if anyone has a diagram of the 360/390 FE block, but does this rear oil return go straight back into the oil pan?

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