Oil pressure loss

Gtodd · Apr 7, 2017

Ok so I was driving n noticed I lost oil pressure. Heard a knocking and it blew black smoke right after the knocking. I pulled over checked the oil it was a qt low. N now the dipstick won't go in!

I was thinking maybe bad oil pump? I have no ideas it drips oil when running

Rons beast · Apr 7, 2017

Hey G,

welcome.

The oil pressure is preserved by the main bearings. Hearing a knock is a bad sign in an engine.

Did you restart the engine and is the knock gone...or still there?

Did the oil pressure come back or is it still low or nil?

If the dipstick won't go back in there may be something blocking it...like a piece of engine debris.

First impressions are that there was catastrophic engine failure. But answer the questions and let examine more.

Gtodd · Apr 7, 2017

The knock went away after adding more oil. Looks like the oil is coming from the back of the engine. Where I dunno I can't see.

Oil pressure still says zero when I add oil

Rons beast · Apr 7, 2017

Sounds like you need to fix the oil leak and get a mechanical oil gauge to check the pressure. Auto parts stores sometime loan these out for a deposit.

If the pressure is still low by the mechanical gauge plan on replacing the bearings and oil pump.

Gtodd · Apr 7, 2017

Thanks I was thinking it was the pan since it's leaking n need to replace the pan n pump also.

miesk5 · Apr 9, 2017

Yo G,

As Ron advised, check the oil pressure.

This is by Ford in 96 Bronco Workshop Manual: "Oil Pressure Test

SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Engine Oil Pressure Gauge T73L-6600-A or equivalent;

Disconnect and remove the oil pressure sensor (9278) from the engine.

Connect an Engine Oil Pressure Gauge T73L-6600-A and Transmission Test Adapter D87C-77000-A, or equivalent, to the oil pressure sender ***** port.

Run the engine until normal operating temperature is reached.

Run the engine at 3,000 rpm and record the gauge reading.

The oil pressure should be: 392-490 kPa (57-71 psi) at 3,000 rpm.

If the pressure is not within specification, check the following possible sources:

Insufficient oil

Oil leakage

Worn or damaged oil pump

Clogged oil pump screen cover and tube (6622)

Excessive main bearing clearance

Excessive connecting rod bearing clearance"

...

Oil Pan & Pump Removal in a 90 5.0 by RFR (Mark) pics are gone

Oil Pan & Pump Installation in a 90 5.0 by RFR (Mark) pics are gone

Oil Pan & Pump Installation in a 95 by TRUCKY18 (Bco) with pics

Trucky wrote elsewhere "...I a used FelPro PermaDryPlus pan gasket, and I belive thats gonna be the one people tell ya to get, hands down. Its the blue rubber type, with little metal spacers to keep if from being tightened down too much..."

Other tios by various Bronco owners:

This oil pan gasket doesnt need silicone or sealant.

Other things to remember..

unbolt the motor mounts and exhaust from the headers (use rust penetrant & heat on exhaust manifold bolts)

jack up the engine from the tranny as high as you can go, I pulled my upper intake to give me additional clearancedon't be in a rush

...

Exhause Smoke:

Blue/Gray Smoke:
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Oil burning in the combustion chamber. Pull a few spark plugs & ck iaw Spark Plug Diagnostic Chart
http://www.gsparkplug.com/shop/spark...ult-diagnosis/
Oil Deposits Symptoms: Oily coating caused by poor oil control. Oil is leaking past worn valve guides or piston rings into the combustion chamber. Causes hard starting and misfiring.
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shut down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder."
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
--

Black Smoke: Black exhaust smoke is an indication of rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
--
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe."
by ASE Study Guide

Oil pressure loss

Gtodd

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Rons beast

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Gtodd

New member

Rons beast

Active member

Gtodd

New member

miesk5

96 Bronco 5.0

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