we have a 4-53 diesel engine i am not much of a diesel person, but this thing has a miss/ low power it is in a log skidder, i was wondering how to test the injectors this is what the owner suspects.

The injectors have to come out and be tested with the appropriate test rig/ball vavle.  Get a manual, the injectors aren't that hard to remove, but you can mess up the timing (which is essentially controlled by the "lash" between the injector and rocker arm) when you reinstall them.  Find a qualified shop to test them.

The injectors have to come out and be tested with the appropriate test rig.  Get a manual, the injectors aren't that hard to remove, but you can mess up the timing (which is essentially controlled by the "lash" between the injector and rocker arm) when you reinstall them.  Find a qualified shop to test them.

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