installing new senders

#1

My brother says the best place for the op sender is in place of the oem op switch under the oil filter. What is the thread for the op switch. I need to order an adapter for my op sensor and I don’t want to drain my oil to pull the old switch.

#2

You want to remote a sensor to that port with a couple feet of hose. Pressure sensors won’t take the vibration and heat of the engine well.

IIRC correctly, the port is 12X1.5. You want to adapt it to 1/8NPT. There’s a number of adapters available that will do it.

http://www.gress.org/Home/Cars/TrackTales/DIY/OilingSystem%20Improvements/OilingPlan.htm

You won’t have to dump your oil to swap it out.

#3

Unfortunately army hydraulics guys know less than I do about AN threads, and aeroquip is half as good as earl’s. I have 1/8-27 threads on my senders which I believe is actually the same as 1/8-npt. My guess is that the taper of -2 AN is between straight and npt. I have an unlimited supply of the aeroquip AN fittings. Can I just get AN tap and run it through a straight thread.

#4

My answer is probably in Engineer to Win but I can’t be bothered to read it right now.

#5

1/8-27 is 1/8NPT.

AN fittings are nice because they are more tolerant of multiple removals and re-installs, but that doesn’t mean you should play around rethreading things. Go get the 12mm to 1/8NPT adapter. Then if you want to use AN, get an 1/8NPT to -2 AN adapter. Then put AN fittings on both ends of your hose.

You can save a lot of $$ going with standard steel and brass hydraulic fittings instead of aircraft aluminum ones. In the hydraulic world, AN is called JIC.

Don’t stop at a pressure sensor, put in a pressure switch too.

#6

A couple more issues worth mentioning. -2AN is pretty small. Might be hard to find adapters. -4 is a fair amount bigger but hose, hose ends, and adapters are common.

In order to put both a sensor and a switch at the end of your hose you will need a 1/8NPT manifold of sorts. These are usually made of brass and in your case will need 3 female 1/8NPT ports. So the whole thing will look like this…

Block>12mm to NPT>NPT to AN>AN barb>Hose>AN barb>AN to NPT>NPT manifold.

The barbs would be hose-ends if you got the hose professionally made, which wouldn’t be a bad idea.

#7

A 150lb box of high pressure, stainless braided AN lines with kevlar chafe sleeves fell off a truck today. Manufactured -4 to -18 assorted lengths with crimpted on ends. B) All I need now are some adapters and it looks like my oil cooler is going to get some new lines also.