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No Oil Pressure

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Old Jan 14, 2010 | 01:14 PM
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Jr. Mechanic's Avatar
Jr. Mechanic
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Default No Oil Pressure

I get a call from my dad last night saying that he has zero oil pressure in his 98 1500 with the 318 and around 200,000 miles.

Apparently, he was almost to the fishing pier when the truck died. Turned out the alternator took a crap. He called up his tow truck buddy and had it towed back to our shop so he could replace the alternator. Slapped a new one on, charged the battery and fired it up only to hear clanking and knocking and no oil pressure on the gauge.

He verified it by hooking up a mechanical gauge, as well as loosening the oil filter. There wasn't even any dribble from the filter.

He said it had 40psi before the truck quit. Now me, I would see this as someones way of preventing me from blowing up my engine, by killing the alternator slightly before the oil pump.

He however doesn't believe in coincidences. His theory is that when they picked the front of the truck up to tow it, all the sludge in the pan ran to the pickup screen and clogged it.

I could see this, as he said that the oil was nasty and mucky when he drained it. With a bad plenum gasket, he was going through a quart of oil a week, so that oil should not have been too terribly bad.

Any opinions? He said it was clanking pretty bad. Right now he's deciding if he should drop the pan and see whats up, put a used engine in, or just yank the motor and rebuild it. The truck is pretty beat, spending it's entire life ungaraged in the South Florida heat. The clear coat is pretty much gone, it needs front end work again, and the interior is starting to show it's age, again mostly due to the heat.

However it has a rebuilt and upgraded transmission with around 30,000 miles on it, and he just put a 75,000 mile rear axle in about a month ago.
 

Last edited by Jr. Mechanic; Jan 14, 2010 at 01:17 PM.
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Old Jan 14, 2010 | 01:21 PM
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i'd say pull the pan and check the mains, rods, pickup tube/screen and the pump before you do anything else
 
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Old Jan 14, 2010 | 01:37 PM
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Yeah, new oil pump and you should be fine.
 
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Old Jan 14, 2010 | 01:42 PM
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although if there was a heavy clunk, the rod and or main bearings may be pretty beat
 
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Old Jan 14, 2010 | 02:15 PM
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Originally Posted by Jr. Mechanic
I get a call from my dad last night saying that he has zero oil pressure in his 98 1500 with the 318 and around 200,000 miles.

He verified it by hooking up a mechanical gauge, as well as loosening the oil filter. There wasn't even any dribble from the filter.

He said it had 40psi before the truck quit.
His theory is that when they picked the front of the truck up to tow it, all the sludge in the pan ran to the pickup screen and clogged it.

I could see this, as he said that the oil was nasty and mucky when he drained it. With a bad plenum gasket, he was going through a quart of oil a week, so that oil should not have been too terribly bad.

Any opinions? He said it was clanking pretty bad. Right now he's deciding if he should drop the pan and see whats up, put a used engine in, or just yank the motor and rebuild it. The truck is pretty beat, spending it's entire life ungaraged in the South Florida heat. The clear coat is pretty much gone, it needs front end work again, and the interior is starting to show it's age, again mostly due to the heat.

However it has a rebuilt and upgraded transmission with around 30,000 miles on it, and he just put a 75,000 mile rear axle in about a month ago.
++ on the new oil pump, with a new pick up, and sludge removal. It should be ok if it wasn't ran but a few seconds. You will know much more about it when you take the oil pan off. If you use full synthetic oil and change it often, sludge will never become a problem.
 
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