WICKED DIESELS
you need more fuel
You can heat up a plunger by holding it in you hand, it will not go back into the pump...Lots of zeros in front of that first digit, designating the clearance.
Info: CP3....Its insides! EXPOSED!!!
- Thread starter mytmousemalibu
- Start date
I'll be surprised if it's tighter than .00005" (50 millionths).
I'm going to guess... Uh... .00008". Now I'll measure. Might be awhile, working on something.
I'm going to guess... Uh... .00008". Now I'll measure. Might be awhile, working on something.
super diesel
<<<< Under Pressure
I've built things to a mighty tight tolarance being a toolmaker in the medical and military fields in controled environments (pretty lucky and fortunate), but air gauging, I haven't had the pleasure unfortunately. Millionths I've always left to the CMM robots and watch makers.
I'm outa the loop.
Duramaxn. Did you get anything sent out to me yet?
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I've used air gaging a lot. I used to be jig bore machinist (in a previous life), and it's the most repeatable method. But...
You need the plug gage made for the dimension, and you need a master ring to calibrate it. Your accuracy is only as good as those two components, and they only fit one size. It's for production gaging. There is clearance between the plug and it's target bore, and air flow is measured.
You need the plug gage made for the dimension, and you need a master ring to calibrate it. Your accuracy is only as good as those two components, and they only fit one size. It's for production gaging. There is clearance between the plug and it's target bore, and air flow is measured.
I will say this:
If you are going to manufacture components like this, you will need an air gauge setup for it or send them out for finish to a shop that has one. Things like intermikes ain't going to cut it. Not even a CMM is the optimum tool for it due to something called lobing.
If you are going to manufacture components like this, you will need an air gauge setup for it or send them out for finish to a shop that has one. Things like intermikes ain't going to cut it. Not even a CMM is the optimum tool for it due to something called lobing.
So if the heat from your hand expands it so it won't fit, then how in the hell does it not gauld up in the bore? Fuel barrier?
super diesel
<<<< Under Pressure
2 different kind of steels and hardnesses, and the fuel film helps too, I'm sure.
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Until the machine I need frees up (parts on it currently) I can't play with it. It might be a day or two.
But the reason I think there's 2 microns (more?) bore clearance is simply so there can be some fuel to lubricate it. They made the piston and bore very long for it's dia and stroke, so pumping losses shouldn't be too bad with some clearance.
But the reason I think there's 2 microns (more?) bore clearance is simply so there can be some fuel to lubricate it. They made the piston and bore very long for it's dia and stroke, so pumping losses shouldn't be too bad with some clearance.
The fuel keeps all the components at the same temp as well as provides lubrication. Liberal application of diesel during assembly is recommended as it is with any pump. That is unless you have the fancy assembly lube.
The shop that I use to rebuild my big diesel pumps sets and builds the whole pump, parts and all, in a pan with a screen in the bottom filled with fuel. Everything is already spotlessly clean, but any stray dirt gets below the screen and stays there. None of the tiny parts can get away either. Thought it was neat the first time I saw it.
The shop that I use to rebuild my big diesel pumps sets and builds the whole pump, parts and all, in a pan with a screen in the bottom filled with fuel. Everything is already spotlessly clean, but any stray dirt gets below the screen and stays there. None of the tiny parts can get away either. Thought it was neat the first time I saw it.
This is one of the coolest threads on here in a little while!! So fascinating talking about things with clearances that most of us can't even really comprehend they are so little. I'm lovin' it!!
You kinda get good at working with little things....if it is your job...:rofl:...naaaa we do a few jobs that we hold .000010 clearance and continue to hold a roundness callout....so .0000xx is a cake walk....very interesting stuff though....
