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Jul 18, 2009 | 08:44 PM

digman

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Hi all my first time to the site
I just aquired my dads 1997 F150 4.2 V6 343,000km. He was told the bottoom end was shot. The problem is the oil pressure drops when you come to stop but when to you are driving it is fine. I am just wondering if that is the actual problem?? Also I am wondering while I have the engine out if there is anything else that should be done? or should I look at a remanufactured I found one (Long Block) $1850 plus tax. The engine doesn't burn any oil and has lots of power.

Jul 18, 2009 | 10:04 PM

steve(ill)

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the gauge is not a real gauge. it is an on- off switch. when the pressure rises to 8 psi or above, the needle goes to 1/2 scale. when the pressure drops below 7, the needle goes to zero. if you have 6 psi, the gauge will read zero. maybe get a real gauge and screw on it, or get a new sending unit and see if it gets better. you might not have an oil problem, but at 350k miles, you might have extra clearances or a worn pump

Jul 18, 2009 | 10:21 PM

SSG VA BEACH

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Joined: Oct 2008

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From: va beach

Hey if it does'nt burn oil and has power I would keep on driving it and save up money for whatever happens to it next.

Jul 18, 2009 | 10:24 PM

ford390gashog

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Joined: Jan 2004

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From: Brentwood,CA

Quote:

Originally Posted by steve(ill)

, but at 350k miles, you might have extra clearances or a worn pump

It is close to 213k when you convert the KM to miles. The metric stuff always throws me off.

Jul 19, 2009 | 07:32 AM

digman

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Thanks for all your answers
I forgot to mention when the oil pressure drops it goes into a rough idle !!!! Could the oil sending unit cause this to happen.

Jul 19, 2009 | 08:06 AM

steve(ill)

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i dont know, but read this????????????

https://www.ford-trucks.com/forums/8...rformance.html

Jul 19, 2009 | 09:07 AM

Grogtronics

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Joined: Sep 2004

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From: Columbia MO

When my truck started to loose oil pressure, I replaced the stock oil pump with a high flow oil pump and then while I was under the motor I replaced the main journal bearings and the bearings on each of the pistons on the crank shaft this took about a half a day and cost less than a $100. after I fired it up the oil pressure was great. I've done this to a couple of engines just make sure when you get the replacement bearing they are all the stock size, had one set of bearings come in a stock box but were actualy oversize, found the oversize bearing markings on the outside after I couldn't put it in correctly.