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Old 11-14-2005, 12:01   #1 (permalink)
kyfiremama
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oil releave valve?

what exactually does this do? i have a mustang that loses all pressure to
the engine and starts knockin. i replaced the oil pump and the pickup
tube, what else could it be? it only knocks when the oil pressure drops so
it wouldnt be the rod barrings or it would do it all the time, right?

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Old 11-14-2005, 14:01   #2 (permalink)
Backyard Mechanic
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Re: 3.8 oil releave valve? Ping Warman

"kyfiremama" <kyfiremama@yahoo.com> wrote:

> what exactually does this do? i have a mustang that loses all pressure
> to the engine and starts knockin. i replaced the oil pump and the
> pickup tube, what else could it be? it only knocks when the oil
> pressure drops so it wouldnt be the rod barrings or it would do it all
> the time, right?
>


Sorry for your problems..

If the problem comes and goes, that is possibly it.

Sorry, never tore that engine down...

--
Yeh, I'm a Krusty old Geezer, staving off dementia here..DEAL with it!
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Old 11-14-2005, 20:01   #3 (permalink)
.boB
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Re: oil releave valve?

kyfiremama wrote:

> what exactually does this do? i have a mustang that loses all pressure to
> the engine and starts knockin. i replaced the oil pump and the pickup
> tube, what else could it be? it only knocks when the oil pressure drops so
> it wouldnt be the rod barrings or it would do it all the time, right?
>

Engine size/year?

--
..boB
1997 HD FXDWG - Turbocharged!
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra - Finally on the Road!

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Old 11-15-2005, 06:01   #4 (permalink)
kyfiremama
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Re: oil releave valve?

the engine is a 3.8 v6

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Old 11-15-2005, 06:01   #5 (permalink)
kyfiremama
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Re: oil releave valve?

the engine is a 3.8 v6

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Old 11-15-2005, 17:01   #6 (permalink)
.boB
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Re: oil releave valve?

kyfiremama wrote:
> the engine is a 3.8 v6
>


If the oil pump is part of the front cover, did you replace the entire front
cover? Or simply replace the oil pump gears and use the old cover?
The pressure relief valve is also part of the front cover. If it's old, you
need to remove it and replace as necessary. It could be something as simple as
sludge keeping it open.
If the whole cover is new, then you need to look somewhere else for the
problem: bad bearings, malfunctioning pressure gauge, etc.

--
..boB
1997 HD FXDWG - Turbocharged!
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra - Finally on the Road!

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Old 11-15-2005, 20:01   #7 (permalink)
Jim Warman
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Re: oil releave valve?

Oil pressure relief valve only keeps the oil pressure from going too high,
though a faulty valve can allow oil to bypass at too low a pressure...

A little more information would be helpful since I am assuming that cold,
everything seems fine but as the engine warms, you are hearing the lifters
starting to make noise? The oil is going to act thicker when it is cold....
As the engine warms. we will usually see oil pressure drop to some degree.
In your case, I would certainly suggest using a mechanical gauge to check
oil pressure both cold and warm.

There are so many reasons for low oil pressure on these.... IIRC, early 3.8s
used a gasket on the oil pump cover.... I believe it was a 3.8 I found that
someone had managed to double gasket the pump allowing to much clearance
around the rotors. Later 3.8s use an O-ring seal on the oil pump.

Was the front cover replaced due to a coolant leak?... If the coolant leaks
into the crankcase, it can kill bearings quite quickly.... Was the oil
changed at the time of the front cover replacement.... without turning the
motor over?. Now many miles.. what year...


"kyfiremama" <kyfiremama@yahoo.com> wrote in message
news:30ff8e46c7150a9bb4126a5107641f0e@localhost.talkaboutautos.com...
> what exactually does this do? i have a mustang that loses all pressure to
> the engine and starts knockin. i replaced the oil pump and the pickup
> tube, what else could it be? it only knocks when the oil pressure drops so
> it wouldnt be the rod barrings or it would do it all the time, right?
>



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Old 11-17-2005, 18:01   #8 (permalink)
cprice@here.com
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Re: oil releave valve?


Shut up Warman


Jim Warman wrote:

> Oil pressure relief valve only keeps the oil pressure from going too high,
> though a faulty valve can allow oil to bypass at too low a pressure...
>
> A little more information would be helpful since I am assuming that cold,
> everything seems fine but as the engine warms, you are hearing the lifters
> starting to make noise? The oil is going to act thicker when it is cold....
> As the engine warms. we will usually see oil pressure drop to some degree.
> In your case, I would certainly suggest using a mechanical gauge to check
> oil pressure both cold and warm.
>
> There are so many reasons for low oil pressure on these.... IIRC, early 3.8s
> used a gasket on the oil pump cover.... I believe it was a 3.8 I found that
> someone had managed to double gasket the pump allowing to much clearance
> around the rotors. Later 3.8s use an O-ring seal on the oil pump.
>
> Was the front cover replaced due to a coolant leak?... If the coolant leaks
> into the crankcase, it can kill bearings quite quickly.... Was the oil
> changed at the time of the front cover replacement.... without turning the
> motor over?. Now many miles.. what year...
>
>
> "kyfiremama" <kyfiremama@yahoo.com> wrote in message
> news:30ff8e46c7150a9bb4126a5107641f0e@localhost.talkaboutautos.com...
>
>>what exactually does this do? i have a mustang that loses all pressure to
>>the engine and starts knockin. i replaced the oil pump and the pickup
>>tube, what else could it be? it only knocks when the oil pressure drops so
>>it wouldnt be the rod barrings or it would do it all the time, right?
>>

>
>
>

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Old 11-17-2005, 19:01   #9 (permalink)
Jim Warman
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Re: oil releave valve?

Still don't have the balls to chat???


<cprice@here.com> wrote in message news:437D2E92.8080206@here.com...
>
> Shut up Warman
>
>



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Old 11-18-2005, 20:01   #10 (permalink)
Jim Warman
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Re: oil releave valve?

I thought so....

Once again... if I have offended you in some way (seems to have started
about the time I voiced my opinion on wreckless behaviour), we have two
choices.... we can discuss it as reasonable adults or engaged in
childishness..... the ball is in your court....


"Jim Warman" <mechanic@tenalpsulet.net> wrote in message
news:Dqbff.116196$S4.25957@edtnps84...
> Still don't have the balls to chat???
>
>
> <cprice@here.com> wrote in message news:437D2E92.8080206@here.com...
> >
> > Shut up Warman
> >
> >

>
>



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