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Record using the "stock" LDT rockers first, then using the LDS rockers. That way we can have a base line to go from.

Could be the cam. I would like to have a LDT and LDS cam side by side and compare lift and duration. That is of course if they are still original and not the replacement cams which were all the same. Also the LDS injection pump springs allow the engine to spool up faster. Could make for an...

The piston squirters are all the same in the later engines. The lower compression pistons where in the smaller multifuel. The LDS and LDT both used "C" and "D" turbos as far as I can see. The earlier LDS used that funky turbo (cannot remember the number) until the 1960's in the 5 tons. Then it...

Well after tearing down 3 Injection pumps and measuring everything I can honestly say the only difference between the LDS and LDT pumps I found is the different springs for the governor assembly and the settings on the "Smoke Limit Cam" . The smoke limit cam adjusts the amount of fuel flowing at...

I found out why there is a circular groove cut into this area. There is a very small hole drilled from the groove to the exhaust port. This passage then creates a small vacuum to help suck out any fuel that goes down the piston shaft. This passage in my housing was blocked that's why I didn't...

I found something interesting while cleaning my "FDC" today. There is a groove cut in the shaft hole for the piston that looks like it will fit an 'O' ring ! I measured this cut-out and it is 0.290" . That is 0.040" over the shaft size of 0.250" (1/4") . According to the "Parker" catalog the 'O'...

Hey quite playing with my hair ! Also I like Dan Fogelberg ! I was at his last concert here in Seattle before he died. Oh by the way sent you a PM.

That's the whole reason for adding a Turbo, increasing the fuel. You can increase fuel but without the air to burn your just wasting fuel. So you add a Turbo and increase the fuel but you need the "pyrometer" to check the exhaust to make sure you haven't gone to far. I just assumed you knew that.

Yes the "Holset" HX35 would be an improvement. In fact a big improvement ! I would install a "pyrometer" first before you changed the "Turbo" though. Don't want to melt your pistons !

I found out something today. The stamped metal housing for the gear on the bottom of the Hydraulic Head is not needed to run the unit. It is just there to hold the gear and shaft in place until it is installed into the pump housing. I also installed all the little side plugs and the 12 point...

Finished disassembly of the LDS pump. Now I'm cleaning up the Hydraulic Head. It was very rusty as it had been laying in a wooden crate on a dirt floor barn for years. It took every thing off except the gear and retainer and thoroughly sandblasted it. I believe once I put it back together it...

Are they different weights ?

Well today was our first "snow" of the year. We got 3" here and everything shut-down ! So after doing my outside chores I went in and decided to clean up the shop and my work bench. After that I saw two of my injection pumps laying there (the other ones are in my container) . One was a LDS and...

OK, the cam gear is pressed on with an alignment key and some bolts to keep it on.

The gear has a nut that is connected to a plate that is adjustable. This is to set initial timing.

These are just the 4 manuals I own, but there are more out there.

Actually there are about 4 manuals like TM 9-2910-226-35 . If you go to all of them you will see different "NSN" and "Federal Stock Numbers" on certain parts, as they where changed throughout the years.

Your right, there is only one cam "Federal Stock Number 2910-871-5432" . I thought I had read about two different cams, but I was mistaken. There are many different sizes of governor springs though which control the rate of fuel delivery.

Yes, but there is a number of differences like the governor springs "Gimpyrobb" mentioned and the total cam height which pushes the plunger in the hydraulic head. If I would just get off my butt and teardown the LDS and LDT pumps I have I could come up with some specification differences.

Ahh come on, that's the easy way out ! LOL !!! We need someone who can machine out there LDT injection pump. Now that would be hard core !