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

Thomas O Mehrkam tmehrkam at sbcglobal.net
Wed Dec 14 20:05:10 PST 2016


I am not far from you now.  I live in Houston Garden Oaks north of the 
Heights. I lived here when we were a Suburb and we were out in the country.

My father grew up on a farm in Waller.  After the war he settled in 
Garden Oaks and worked as a Printer.  The 47 acres is part of my Grand 
Fathers  farm.   The H belonged to an Uncle. I worked in Sharpstown  and 
Stafford for 35 years.  Now working  290 and Pinemont NW Houston.


On 12/14/2016 9:30 PM, Dennis Johnson wrote:
> Thomas,
>
> You will be close to me when you move. I am about 48 miles South of you in Rosenberg.
>
> Dennis
>
>
> Sent from my iPad
>
>> On Dec 14, 2016, at 9:02 PM, Thomas O Mehrkam <tmehrkam at sbcglobal.net> wrote:
>>
>> Oil pressure followup.
>>
>> Oil pressure specifications. Engine at temperature 200F, 2000 rpm
>> pressure between 40 and 75 psi.  Mine is at 53 psi.   Not bad for
>> 240,000 miles.
>>
>> I found a oil pressure test set at harbor freight.  $27.  It had a
>> gauge, 5 1/2 ft hose and a bunch or adapters.  It could use some type of
>> swivel. I had to crawl under the truck and out from under it at least
>> five times to relieve the torque on the hose to be able to thread in the
>> gate. A swivel would have been much easier but it worked.  The gauge
>> looped over the driver side mirror makeing it easy to perform the test.
>>
>> http://www.harborfreight.com/catalogsearch/result?q=oil+pressure+tester
>>
>> The pressure sender thread is 1/4 18 MPT  instead of NPT.  No O ring on
>> the gas engine just some thread sealer.   It is a straight thread. The
>> tester had a tapered thread and engaged two threads sealed fine for the
>> test.
>>
>> Pressure was 30 psi at 1000 rpm idle.  28 psi in gear at idle 700 rpm
>> and 70 psi max wot.  I installed a new pressure switch and all looks
>> fine.  Time to go hunting this weekend.  Yea.
>>
>> Thanks for the help.  I tried to put a tester together from parts from
>> Northern Tool but they did not have the proper gauge in stock so the
>> Harbor Freight it was. About the same price anyway.
>>
>> ANTIQUE Tractor Reference.
>>
>> I am moving a house on my 47 acres in Waller Texas.  When things dry out
>> I will be using the Ford and trailer to move my Farmall H and blade to
>> level the pad for the house.
>>
>>>> On 12/14/2016 6:19 PM, Steve W. wrote:
>>>> tmehrkam at sbcglobal.net wrote:
>>>> Thank you.
>>>>
>>>> For some reason I did not think about NAPA
>>>> Strange it says MPT which is a straight thread not tapered.
>>> The actual unit in the engine nor has the same thread form as NPT, but
>>> it is a straight thread with an O-Ring that seats against the block to
>>> seal it. Only the OEM switch is made that way.
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