Install oil pressure gauge

[Gary Sweat]

At least the bulb is not turned down.It should slide by the limbs? Why is the loader always in the way?? Bending over the arms can be a chore? At least for me. Jy.

I know what you mean! Used to be a breeze to work on. Just one of them things ya don't think about while building something.:confused2:

 

[California]

One thread per inch difference on npt verses bpt. McMaster-Carr

Interesting! I just learned something.

At 27 tpi for USS and 28 tpi for the BS in the Yanmar block , and assuming you can thread the brass fitting into the block about 6-7 turns before it takes excessive force to go any more and also won't leak (based on my observation), then it's in about a quarter inch. The Mcmaster-Carr diagram says 0.26" engagement if the threads matched. Since the threads don't match, I expect a little less than a quarter inch engagement.

27 tpi calculates to a thread pitch of roughly .040. (1 inch / 27).

In that quarter inch of engagement, the threads are mis-aligned about .010 overall, which is about 1/7 of .010 (about .0014) per each thread.

Assuming you use brass fittings, and that a tapered threaded fitting is intended to deform to attain a seal, then screwing a 27 tpi brass fitting into a 28tpi hole a quarter inch deep seems pretty harmless. Not ideal, but 'good enough for the girls I go with' as an old Carpenter friend used to say!

And applying theory to practice, putting 1/8 USPT fittings into my Yanmar block temporarily to verify that I had a dead oil pressure sender sealed fine, and didn't distort anything so far as I could see. I had also bought a HF oil pressure test gauge and whatever the threads were on that, it screwed in fine too.

 

[Gary Sweat]

Got the gauge installed. I like the fact it came with the ability to keep the light too. Built into the sending unit. Here are the pics with the engine running at about 1100rpm. It is 68 degrees in my garage so the oil pressure will drop I'm sure when it gets hot. At least it seems the oil pump is working fairly good. I run Rotella T 15-40 and so far it seems to work ok.

And yea, I let the grinder slip when I was enlarging the hole to 2" so I get to repaint the dash again

The switch below the oil gauge is the TS. I wanted something to remind me if it was not off.

 

[Gary Sweat]

Interesting! I just learned something.

At 27 tpi for USS and 28 tpi for the BS in the Yanmar block , and assuming you can thread the brass fitting into the block about 6-7 turns before it takes excessive force to go any more and also won't leak (based on my observation), then it's in about a quarter inch. The Mcmaster-Carr diagram says 0.26" engagement if the threads matched. Since the threads don't match, I expect a little less than a quarter inch engagement.

27 tpi calculates to a thread pitch of roughly .040. (1 inch / 27).

In that quarter inch of engagement, the threads are mis-aligned about .010 overall, which is about 1/7 of .010 (about .0014) per each thread.

Assuming you use brass fittings, and that a tapered threaded fitting is intended to deform to attain a seal, then screwing a 27 tpi brass fitting into a 28tpi hole a quarter inch deep seems pretty harmless. Not ideal, but 'good enough for the girls I go with' as an old Carpenter friend used to say!

And applying theory to practice, putting 1/8 USPT fittings into my Yanmar block temporarily to verify that I had a dead oil pressure sender sealed fine, and didn't distort anything so far as I could see. I had also bought a HF oil pressure test gauge and whatever the threads were on that, it screwed in fine too.

I don't see how leaving a 27 tpi permanently would hurt anything. If it seals and you have a 1/4" into the threads that should be more than secure enough for a gauge. It's not like it is trying to hold anything up. I don't think you could take it out and put it back more than a few of times before the threads on the gauge would be to distorted and wouldn't seal but then, why would you need to? Unless it was some really thick brass, I don't see how it could damage the steel threads in the block. I just got lucky and the bspt adapter came with the gauge.

 

[Neat 1500]

i used all electric gauges to remove the "showered in hot oil" problem. i bought mine from Hong Kong and all the fittings and the like fitted the Yanmar perfectly.

 

[Gary Sweat]

i used all electric gauges to remove the "showered in hot oil" problem. i bought mine from Hong Kong and all the fittings and the like fitted the Yanmar perfectly.

Where did you get your gauges from? I still want to put in a temperature gauge.

 

[Neat 1500]

Where did you get your gauges from? I still want to put in a temperature gauge.

i found them on Ebay, i will go looking again for the seller as i want another set for the YM14.

 

[normde2001]

Most guys use SUNPRO 1 1/2' triplet gauge kits, (separated), available at Autozone or most autoparts stores. Harbor freight also has similar gauges for about 1/2 the price, and probably just as good.

 

[Gary Sweat]

Most guys use SUNPRO 1 1/2' triplet gauge kits, (separated), available at Autozone or most autoparts stores. Harbor freight also has similar gauges for about 1/2 the price, and probably just as good.

Back about 2 years ago I bought the triple set from Autozone but only put in the oil gauge at the time. The face plate ring around the gauge rusted up over time and eventually the oil line at the gauge broke. This time I looked for one that was either stainless steel or aluminum. I want to put the other two in now as long as they have the same material for the face plate.

I wanted 1 1/2" but all they had in stock was 2". Easy to read but takes up a lot of room on the dash.

 

[Gary Sweat]

i found them on Ebay, i will go looking again for the seller as i want another set for the YM14.

Thanks. The oil gauge I purchases is a iEquus performance and cost 49.00. I like it because it came with several different size fittings and had the BSPT fitting, all of the wire connectors and really good instructions on how to install it. I got it at O'reilly auto parts and supposedly the sender can be purchased separately if it ever craps out.