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No, I don't have any issue with the paper element itself. It is the sealing interface (cork) and the o-ring on the shaft that I don't trust to be 10 micron tight.

The button on the LDS427-2 is a BO901 and all of the rest from LDT to LDS are BO903. Ambac specifies that the BO903 is the replacement for the BO901. The ambac manuals also specify that the replacement buttons must be lapped to the plungers. I have NO doubt that anyone with a couple of...

Measuring vertically from the top of the plunger, the only difference between the plungers is the height of the groove around the plunger; about 0.012 taller on the LDT head. The vertical location of all ports is the same. I don't the means to easily measure the "timing" of the ports.

I appreciate the insight, Rusty. However, both of these pumps had the same maximum governed speed: 2600 rpm. Only the LDS427-2 and LDS465-2 had higher governed speeds (2800 rpm). I like the comparison to a distributor on a gas engine. However, on a distributor, the timing of the spark is...

Probably even less meaningful after noting that the cam determines the injection event and those are all the same.

I have wondered for quite awhile why there is a different hydraulic head on the LDS engines. I wasn't able to find any differences in the military or Bosch documentation. It wasn't clear why a different hydraulic head was specified for such a minor difference in horsepower. I have accumulated...

I read part of that thread but it didn't really agree with what I saw here in the truck shops. Based on discussions in two different truck shops, it seems that all they have ever used is 50wt. However, it was your comment that the viscosity should be 50wt "minimum" in that thread that led me...

I've heard of talcum powder being used as well; back in the depression era cars. I hope that my transmission isn't that bad yet. :grin: I put in 40wt engine oil based on the recommendations of the board and the shifting got a little notchy as the transmission warmed up. Straight 50wt is...

I replaced the 40wt engine oil with 50wt transmission oil from the local truck shop. Not really less noisy but it does seem to shift better (or doesn't shift worse as it warms up). The benefit of the engine oil is that the detergents did clean out the transmission and transfer case.

David, There certainly is some slop in the 2nd gear. I don't think as much as what is shown in the video. I can't hear any metal "clacking" sound as I move it back/ forth. Rusty, I was running cheap 40wt oil; going to put the correct 50wt back in and let it be. I have another spare...

Found time to pull the cover off today. There is a strange wear pattern on third gear and a few teeth broken off of the reverse idle gear. Overall, thought that I'd have found worse. I think that I will refill with 50 weight and start planning for a transmission swap next summer or a new...

About a year ago, I drained the oil in my deuce transmission (very dark) and put 40wt in and magnets on the fill and drain plugs. Yesterday, while preparing for a 150 mile trip, I discovered that the fill plug magnet had quite a bit of metal glitter. I drained the oil and found the same amount...

Hey, nobody else provides as much entertainment as you do. Til next time, Rusty.... :-D

https://m.jdparts.deere.com/partsmkt/document/english/pmac/5452_fb_BreakInOil.htm

Modern tractors still use break in oil. At least the green ones do.

Rusty, please see here, right from the ring manufacturer: http://www.ms-motorservice.com.tr/fileadmin/media/MAM/PDF_Assets/ks_50003958-02_web_53094.pdf 1.6.11Piston ring movementsRing rotationIn order for piston rings to run-in andseal properly, they must be able to rotatefreely in their...

LOL. I know you love to argue EVERYTHING. You are correct that they will stop rotating if the cylinder becomes out of round. Otherwise, they will normally rotate. This has been studied quite a bit by engineers and published; read up. Let me know if you need some hand-holding and I'll even...

Yes, piston rings rotate. I'd guess that the cross hatch is the cause. What is also interesting is that the rings will rotate at different rates. Accordingly, no matter that you carefully you space out the gaps, they will eventually line up.... and then move out of alignment....

You wrote "the Air-Pak has a "multiple" factor of 10 between the inlet and outlet pressures" which is not really what your scanned document states. The document states that you multiply the third part number by 10 to get the hydraulic pressure at an air pressure of 90 psi under full braking...

I don't think that is what it says. Read your scanned text again. You multiply the part number by a factor of 10.