D4 7U33999 possible new owner questions

Hi...almost a Cat owner,
The first thing that comes to mind is when an engine starts having water leak problems the owner generally abandons or minimizes the use of antifreeze and corrosion inhibitors so corrosion and sediments in the water side accelerates making liners and pre-combs likely candidates for leakage.

I'd recommend you get yourself a set of manuals or find access to review the material that pertains to your symptoms.

Parts sources are pretty well described in the "sticky" at the top of the discussion page.

If you can't sort it out with the info at hand or by searching the topic, come on back and we will assist you. Good luck and welcome😊

thanks for the help i hope the machine works out, i would love to save it from the scrap man.

At the dealer I made up a pressure testing tool to check cylinders for leakage and other problems. I got a retaining nut that holds the nozzles and stem down in the chamber and welded a pipe nipple on it so I could attach an air hose on it and I also had a pressure regulator in the air line and would set the pressure at about 90 lbs. and would put the engine on TDC on the cyl. I was checking and then observe if air was getting in the cooling system or any other symptoms showing up.I used this dozens of times at the dealer and told me so much when looking for a problem.Cat later came out with a dummy nozzle with a straight through hole in it to do he same test but the one I made worked good.If the engine tends to turn when you put the air down on the piston you can put the tractor in gear with the clutch engaged and the brakes on but make sure the throttle is in the off position.Remember the cyl. your checking has to be on TDC on the firing stroke so the valves are closed.Forgot to mention, that it,s good idea to put a shut off valve in the line before the pressure regulator and you can turn the air off once you get the pressure built up in the cyl. and then you can observe leak down on the cyl. and how fast it is escaping. This test will and can pin point where or what the problem is causing it.This testing saved so much time finding out where a problem was in an engine at the dealer and saved the customer money too.

that sounds like a great idea, do you know what size/pitch threads are on the injector nut. as i have to go to my buddys shop to work on the machine i would like to make a tester up before i go over there.

thanks a million

I have used the rubber tip off of an automotive compression test gauge. The one I used slipped over a 1/4" pipe. It fit right in where the injection capsule goes and you can easily hold it against 100 psi air pressure. I have seen a couple of kits in Wally World air tool dept that you could make one up for 20 or 30 bucks.

Tom

If you go the route of making up an adapter just take the nut to someone that has a thread gauge if you don,t have one and get the diameter of the nut so you can get material to make one up.

Here is a tool I made out of 6061 T6 Al.