Do you have the front cover off the engine?
There will not likely be a timing mark on the flywheel or balancer.
They are usually on the gears under the engine front cover;
When the engine front cover is removed you will likely have a cam gear, an injection pump drive gear, an accessory drive gear, the crank drive gear and likely a balancer drive gear.
All of those gears should have a mark and often two marks, that will all line up with the marks on the meshing gears. Gears with 2 marks will usually line up with the marks on two different meshing gears.
When all the dots are properly adjacent to each other the engine is in time.
Then the fuel injection drive gear can be removed from the injection pump and the pump removed.
Every engine is going to have it's own final pump timing procedure for removal and re-installation.
The gear timing marks can be similar to these,
This is one of Branson's timing procedures for final injection pump timing;
This why you will need a service manual.