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oil pickup fell off, low oil pressure during braking, fixed

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Old 10-19-2015 | 10:47 PM
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EvelBist's Avatar
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From: Tijeras, NM
Car: 89 Black GTA
Engine: 'close to' stock 5.7 but trending>>
Transmission: 700
Axle/Gears: 3.27
oil pickup fell off, low oil pressure during braking, fixed

Symptom:
Normal oil pressure while driving. When coming to a stop during braking, pressure gauge drops to almost 0.

Problem:
Oil pickup tube and screen came out of oil pump. When braking, oil level in sump drops below oil pump, thereby starving pump for oil. Oil is sloshed to the front of the pan. Once the oil returns to the sump, oil is available to the pump again, and pressure returns. Pickup tube and screen are laying in the bottom of the sump.

You can verify this by draining the oil, and sticking a clean flexible rod into the drain hole and moving around the bottom of the sump to see if something is loose in there.

Solution:
Either pull the engine or lift it high enough (there are threads on this site that explain how to pull the pan with the engine in the car.

In my case, the pickup tube had been tack welded to the pump in the past so I wanted a better method of keeping the tube attached to the pump. I obtained a 1 1/4" 0.092 diameter roll pin, and a 0.085 drill. With the pickup tube in the pump, drill through the pump and tube all the way through to the other side. Pull the tube out and clean out the drill shavings, then put the tube back in and drive the roll pin through till its flush with the pump surface.
Old 10-20-2015 | 08:17 PM
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Re: oil pickup fell off, low oil pressure during braking, fixed

Tack welding is usually a pretty good retention method... if it failed, I'd be thinking about trying to diagnose the cause. Which would ordinarily be, vibration. Which in turn would ordinarily be, balance.

But you're right: the roll pin method is well and widely known to be an acceptable, and possibly better, retainer.

Not sure what "The Best" method is; but, just because it's eeeeeeezy and cheeeeeeeeep, and I've never had one break, I usually braze (or silfoss) the pickup into the pump body after removing the regulator spring. Gives all-the-way-around attachment as opposed to a single spot. Also gives me a good excuse, when appropriate, to put in a higher pressure spring.
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