>> >> Paul,
>> >>
>> >> re pick up tube to go with the wedge tank. Originally I was
>> >> going to silver solder hard copper plumbing fittings to make this.
>> >> My logic was that silver solder is very strong and has a melting
>> temp
>> >> of over 1000 �º. However, I learned yesterday that silver
solder has
>> >> a service life that is quite short when temperatures are sustained
>> >> above 300�º. The words service life and pick up tube should not
>> >> appear together. It has to last forever. So I am back to steel or
>> >> stainless steel. Can someone put a magnet on the stock tube and let
>> >> me know if it is SS? Is there any reason to defend against oxidation
>> >> at all given the location inside the pan. I am not looking forward
>> >> to building the bolt flange out of SS but what ever Mazda did
will >> be
>> >> the standard.
>> >>
>> >> Jerry
>> >>
>> >>
>> >> Jerry,
>> >>
>> >> Some stainless steels are magnetic - some are not.
>> >>
>> >> The "magnet test" is inconclusive...
>> >>
>> >> Jack Beale
>> >
>> > I am aware of that but I have yet to run into the magnetic variety.
>> > If it does not react to the magnet, then it is SS. If it does react
>> > then it is possibly SS. or more likely just steel. I can take from
>> > there. Jerry
>> >
>> > I am pretty sure it is steel Jerry although I am not at the hanger to
>> > check.
>> >
>> > Paul
>>
>> Jerry,
>> I have one out of an 86 that has been stored in a slightly damp,
>> unheated shed for the last few years. Tube, plate and screen are all
>> magnetic. The tube has two small pea size spots of surface rust
while >> the
>> plate the screen and the rest of the tube are rust free.
>>
>> John Gibbons
>>
>> Jerry,
>> The likely possibility is that the tube on the stocker is standard mild
>> steel (1010 or 1018)
>> with the surface passivated or coated. 400 series stainless is usually
>> used in an application
>> the material needs to be hardenable. Ferritic stainless is hardenable,
>> frequently it is used
>> to make knife blades. Ferritic (usually 400 series) is magnetic. It
>> would be super unlikely
>> that the PU tube would be made from this material. 300 series stainless
>> steel is the bright
>> stuff we normally think of as "stainless". 300 series is non-magnetic.
>> Both stainless types
>> are expensive. Mazda wouldn't use them unless problems forced it. The
>> tube is likely
>> 1010 or other low carbon mild steel.
>> Bill Jepson
>
> Bill, I need further education. Do you think the pick up tube
> needs to be coated? Jerry

Jerry,
I would say so, a small pin hole from rust will introduce air and
disrupt your suction..
George ( down under)

If you have water in your oil you have more problems than rust
on your oil pick up tube.

Paul Lamar ...No rotor no motor.

Jerry,
For an oil pickup you needn't worry about corrosion much, just oil up
the tube after you weld it.
4130 will be total overkill for that part. The factory likes soft
(relatively) tubing so the bends are easy.
For our use I always remind people to safety wire the pickup tube
mounting bolts to avoid problems
Manufacturers often use electrogalvanized (fine surface not like hot
dipped) steel for bad areas. Not
needed in the oil pan.
Bill Jepson

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