B7300 Injector pump questions

[pescadorjm]

I just purchased a B7300 tractor and need some advice to get it to run. First a little history on the machine. The tractor has 122 hours. The engine had problems and the owner hired someone to work on it. The mechanic took off the injector pump and injectors, the front gear cover, water pump, and various other parts. It was determined the injector pump was bad so the owner bought a new injector pump, and new injectors. Then the mechanic left town and the tractor sat for a long time in this condition. Maybe a few years? I bought the tractor and have put the engine together. I lined up all the index marks on the gears (one dot, two dot, three dot). put the gear cover plate on with the water pump etc. I then put the new injector pump on and the new injectors. The pump and injectors were still in the box and had never been opened up. There was one injector pump shim/gasket on the motor. Now I have everything back together and have bled the injector pump and injectors. When I crank the engine nothing happens, it doesn't fire. White smoke is coming out the intake valve cover and not the exhaust. My questions: Is it possible that I need more shims under the injection pump? How do you determine what is the correct amount? Can I take the injector pump off and add new shims without taking off the gear cover and lining up the index marks on the gears again as long as I don't move the crank shaft while the injector pump is out.
I don't have a compression tester and will try to get one. Is there anything else that I should have done or can do?
Thanks for your help.

 

[kubotasam]

When you say white smoke is coming from the "intake valve cover" do you mean from the intake manifold where the air filter connects to? Nothing should come out of the intake manifold. It should have a strong suction in while cranking. If it is blowing out then the valve timing is way off.

 

[pescadorjm]

Sorry, meant to say just "valve cover". Not "intake valve cover".

 

[kubotasam]

so you are saying white smoke coming out from the valve cover breather tube. That suggests bad or stuck rings. A compression test is needed.

 

[pescadorjm]

I took the valve cover off and watched as I cranked the engine. That's how I saw the white smoke/vapor? I was not seeing anything come out of the muffler which I think I should have if there was fuel going into the cylinders.
I should take the head off and check valves and top of the pistons. I know this engine had rain water go in it when the injectors were off. The previous owner had it covered but his goats got to the cover. Not sure how long or how much water got in there.

 

[Russell King]

The rings may be rusted/locked to the piston.

You can try the method in the nest to last post in this thread.

Basically put some Marvel Mystery Oil in the cylinders and let it set for a while. Be sure the oil is out of the cylinders before cranking it over or you will damage the engine. I personally would not know how to do that.

http://www.orangetractortalks.com/forums/showthread.php?t=10796&highlight=marvel+mystery

 

[pescadorjm]

The person I bought the tractor from (not the original owner) had filled all three cylinders with Marvel. The Marvel had been in there at least a month before I got the tractor. With the injectors out I just cranked the engine by hand and that blew out all the Marvel Mystery Oil. Maybe I could try this again now that I have turned the engine over many times.
Something I would like to know and is one of my original questions in this post is " Can I take off the injector pump without having to take off the gear cover and lining up all the gears again?
Thanks for all you replys

 

[pescadorjm]

Re: B7300 Injector pump questions Update

I've done more work on the engine and wanted to pass along things I've discovered and learned.
I've split the tractor and taken the head off and the pistons out. There was much corrosion and crude on the valves and valve seats. Only one valve of the six was getting a seal. All the piston rings on all the pistons were stuck and not doing anything. I've honed the piston bores. Number 1 cleaned up with only a few passes of the hone. Numbers 2 and 3 have bad spots in them where I suspect the top of the piston was when the engine sat for so long with water in the bore. Today I will continue to hone cylinders 2 and three until I get them clean or reach the maximum allowable ID of 2.6444". If this doesn't get it then I will have to have the block bored and buy new oversize pistons and rings.
Things I've learned:
The one dot, two dot, three dot index marks on the gears are for timing the crankshaft so the pistons do not hit the valves. They have nothing to do with the timing of the injection pump.
You can take the injection pump out at any time without worrying about the position of the crankshaft.
The timing of the injection pump is done by first taking out the injectors and the fuel lines from the injector pump to the injectors. Looking at the number one hole on the injector pump turn the engine over by hand until you see the first movement of fluid. This will be when the number one piston is at or just before TDC. Then look in the inspection hole on the side of the engine next to the flywheel on the injection pump side of the engine. There is a mark on the flywheel that should be lined up a line on the engine block. If it is not then you need to add or subtract shims under the injection pump so it does.
There may be a different or simpler way to time the injection pump but this is how I was told by the mechanic at the Kubota dealer close to me.
Some or all of this may be common knowledge to most of you but it's all new to me and may help someone else. If I have given bad information or something I said needs to be corrected please do so.

 

[JJS]

Thankyou for posting your findings with the injection pump, I was on here initially to see how to shim a pump, and how to tell whether you need to add or subtract shims, like you were originally asking, so I decided to join the forum to say thanks, and your post has been appreciated.
Thanks again,
-John