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Old 05-16-2018, 02:32 PM   #1
onlinebiker
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Default 93 SW2 sudden loss of oil pressure

Got my 93 SW2 home.

Story from previous owner ( second hand info) the original owner - from southern Indiana was in Holland Michigan a few weeks back - and had the oil light come on - and a bit of lifter noise developed at the same time.


Any likely culprits come to mind?

I' ve been over this car - and it' s by far the cleanest gen one car I' ve seen. Interior near perfect, only a couple scratches in the paint - all the clear coat is still good. It even came with good Firestone tires. Just under 80 k miles.

I' D be happy even if I need to get a new engine for it.

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92 SC2
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Old 05-16-2018, 02:35 PM   #2
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1998 SC2
Default Re: 93 SW2 sudden loss of oil pressure

Pressure switch failure. The switch is a 14mm X 1.5mm and with an adapter to 1/8 TIP you can connect a real gauge and see whats up but as it is a 5-7psi switch that is the first guess and the 2nd is something hard went through the oil pump and cut grooves in the pump cavity.

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Old 05-16-2018, 02:46 PM   #3
amazinghl
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Default Re: 93 SW2 sudden loss of oil pressure

Get a mechanical oil pressure gauge and measure first!

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85 GLH 367whp. http://www.saturnfans.com/forums/showthread.php?p=2261629#post2261629
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Old 05-17-2018, 01:44 PM   #4
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Default Re: 93 SW2 sudden loss of oil pressure

Got a mechanical gauge, pulled the sensor - plumbed in mechanical line and starter it up.

Flat line.

Zero pressure.

Checked gauge. Gauge tests good.


Guess I' m pulling and rebuilding this one.

Cool. Can pull the bottom end, and put oil return holes in the oil ring groove.

This sucker will run a million miles.


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92 SC2
93 SC2
93 SW2
95 SC2
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97 SC2
99 SC2
02 SC2
02 SL2

parts
2 94 SC2 parted out
3 96 SC2
98 SC2 - rusty frame minus engine.

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Old 05-17-2018, 02:01 PM   #5
OldNuc
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1998 SC2
Default Re: 93 SW2 sudden loss of oil pressure

Pistons must come out the top and the pressure failure is probably in the timing cover. You must find out exactly what caused this failure or it will happen again.

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Old 05-20-2018, 12:32 AM   #6
onlinebiker
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Default Re: 93 SW2 sudden loss of oil pressure

Agreed. Plan on total disassembly. I'm guessing either the overpressure valve came out, or the key sheared.

...
92 SC2
93 SC2
93 SW2
95 SC2
97 SL2
97 SC2
99 SC2
02 SC2
02 SL2

parts
2 94 SC2 parted out
3 96 SC2
98 SC2 - rusty frame minus engine.

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Old 05-20-2018, 09:03 AM   #7
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1998 SC2
Default Re: 93 SW2 sudden loss of oil pressure

OPV is far from failure prone but a chunk of plastic guide will jam it open. Most likely cause is guide fragments in the pump and the timing cover recess is now sufficiently scored that all oil bypasses the pump back to the suction at low RPM. The pump is driven by the crank key and they do not shear.

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