George, the 624 Diesel should have a German build D-206 engine with a Bosch VA Injection Pump. The D-206 was used in 624,584,595,3230.
The later models of D-206 used the newer Bosch VE Injection pump. In Canada parts are still available for these Bosch injection pumps as my brother replaced the front lip seal on his 454 with D-179 and Bosch VA3 injection pump.
Go to CaseIH parts at: http://www.caseih.com/home.aspx?RL=ENNA Follow the links Search for Parts and then in the Model: box enter D-206 and click Search button.
Also check out: http://www.realdiesel.com/vapump.html
This company appears to still service BoscH VA injection pumps.
Hope this Helps