[AT] Off Topic 2001 Ford F250 6.8L engine. Oil pressure gage port size.

[Dave]

NPT size information here: http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html <http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html>
	Dave

> On Dec 14, 2016, at 11:17 AM, Alan Nadeau <ajnadeau1 at myfairpoint.net> wrote:
> 
> As Dennis has already stated, any OP sending unit I have seen has been 1/8" 
> National Pipe Thread (NPT).  I can be confusing as pipe threads bear 
> virtually no relationship to the diameter of the actual threaded 
> fitting/sender/widget.  1/8" NPT is very close to 3/8"Ø.
> 
> OP senders/switches can fail in some very imaginative ways.  We had one go 
> bad on a early-70s Ford Pinto 2.0L engine.  This was a switch, only a light 
> for an indicator.  Very cold conditions and it came on while driving down 
> the highway.  Light would go out when the engine returned to idle.  Oil 
> level was where it was supposed to be.  Installed a new switch, problem went 
> away.
> 
> Had a OP sending unit, gauge in an '89 GMC, 5.0L.  Gauge in that one dropped 
> to almost zero.  Installed a new sending unit along with a mechanical gauge, 
> PITA to get at.  Problem went away.
> 
> Al Nadeau
> 
> ----- Original Message ----- 
> From: "Dennis Johnson" <moscowengnr at outlook.com>
> To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
> Sent: Wednesday, December 14, 2016 10:32 AM
> Subject: Re: [AT] Off Topic 2001 Ford F250 6.8L engine. Oil pressure gage 
> port size.
> 
> 
>> I do not know on this engine, but generally most oil pressure ports are 
>> 1/8" NPT
>> 
>> Dennis
>> 
>> Sent from my iPad
>> 
>>> On Dec 14, 2016, at 9:25 AM, "tmehrkam at sbcglobal.net" 
>>> <tmehrkam at sbcglobal.net> wrote:
>>> 
>>> I am having problems with the oil pressure switch on my F250.  Yesterday 
>>> the gauge "Foo Gage" stayed at zero when the engine was started cold.  I 
>>> shut it off, checked the oil, started the engine which sounded good and 
>>> the gauge finally came up.
>>> I changed the oil and Filter Sunday.  Motorcraft oil and Filter So it 
>>> could be a number of issues.
>>> 
>>> 1. Bad oil pressure switch.2. Bad check valve in the filter.3. Worn 
>>> bearings or oil pump problem.
>>> I am getting a new filter and would like to install a mechanical gauge. 
>>> Does any one have experience with this engine or the 5.4 Liter engine of 
>>> the same vintage. I am going for parts at Noon and would like to know the 
>>> port size.  My best guess is 3/8 NPT.
>>> PS: Drove it home and then back to work with no indications of low oil 
>>> pressure and the gauge worked fine.  But others have reported oil pump 
>>> problems on this engine.   I only have 240,000 miles on this thing and do 
>>> not want to mess it up.
>>> 
>>> 
>>> _______________________________________________
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>>> http://www.antique-tractor.com/mailman/listinfo/at
>> 
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