Simms injector pump question

[motoOzarks]

Simms CAV Minimec injector pump on Case/David Brown 1690

I did some cleaning on the injector pump and noticed some puddling of diesel on the third injector "feed". I have looked at parts diagrams but they do not go inside the pump so I don't know what the parts are called.

It's not the line, it is where the line connects and tightens to the top of the pump. They are not meant to have a wrench or socket, unless it is special made, to be used on them.

I found a video on utuber where a fellow had removed the top plate to expose the springs that are under them, when taking the top off all six of the "feeds" stay with that top part.

My question is what seals those? Is there an oring in there? Do they unscrew? Can I tighten it or try? It puddles around it gently as the engine is running and is the only one doing it. That one has also had a new line put on by a previous owner for some reason.

Does anybody know where to find an exploded view of this pump.
thanks

 

[Dieseltech]

There's a special fine splined socket to remove/replace those delivery valve holders. The newer pumps use a steel top sealing washer and an O ring BETWEEN the bottom of the delivery valve and the top of the plunger barrel. When any start to leak it's USUALLY time for the pump to be torn down and gone through anyway to inspect cam bearings and replace the governor weight assembly. The governor has skate wheels that wear on a steel back plate, wearing divots into the plate by the skate wheels, that also get flat spots keeping them from rolling when worn. Ford Simms pumps have the same issues on the older pumps.

 

[showcrop]

Have you changed the oil in that Simms pump yet?

 

[motoOzarks]

I have changed it.
I have not checked the level since to see if it is taking on diesel.

 

[miner09]

Your best to take it to a shop that rebuilds pumps. Dieseltech rebuilds them and has all the special tools. When you remove from tractor you have to know how to keep it in time.

 

[motoOzarks]

Rainy day so I decided to do some investigating.....
4 out of 6 broken springs

 

[Dieseltech]

Rainy day so I decided to do some investigating.....
4 out of 6 broken springs

Common to see on Ford and DB Simms pumps, along with governor weight set wear.

 

[motoOzarks]

Another question
What is this drain for? Fuel or oil? Referencing the fitting under "England".

What causes it to drain?
thanks

 

[Dieseltech]

Another question
What is this drain for? Fuel or oil? Referencing the fitting under "England".View attachment 76320View attachment 76321
What causes it to drain?
thanks

That drip tube drains off excess fuel that is normal from the plungers that slowly leak fuel into the cam box area over time. Newer engines that are ENGINE oiled have DUCTED plungers that don't seep fuel like the early pump plungers do.

 

[motoOzarks]

I have acquired a spare tractor that has a supposedly rebuilt pump. I would like to swap the pump to this tractor and see what happens.
I have the shop manual that describes how to remove and reinstall a pump on an engine that doesn't spin when it is off. It does not elaborate any further.
It is pretty simple find tdc on the compression stroke and leave the engine alone and remount. There is a tdc indent in the flywheel that lines up with a hole in the bellhousing to make this pretty bulletproof. Assuming I don't confuse tdc compression with tdc exhaust.....
It also states that the pump has initial timing advance of 25 degrees btdc. It gives the measurement down from tdc in the chart to use as well.
I'm assuming find tdc compression stroke then rotate backwards 25 degrees/measure the distance as the piston retracts.
My question is do I just set both tractors to tdc on compression stroke and then swap?
Do I need to take the btdc into account for the swap?

thanks