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I would just like to say thanks for all your help...Over my Xmas break i got the ole cummins running again! she came back to life without to much effort honestly...flushed the coolant system real good...new coolant and added coolant filtration...Got the oil changed and added a spin oil filter...

Update: All three heads passed the pressure test and all my injector cups were good to go...Just got my shop manual yesterday and my injectors will be here on friday...Almost have all the parts to put her back together...I tracked down a spin on oil filter setup and a coolant filter setup that...

Yes very true...if its mechanical it can break or wear out...I'm a maintenance technician in a die cast foundry...I see machines run at full capacity for many hours with out breaks and needless to say there are failures every now and again...I don't mind wrenching and this gives me a good lesson...

Just got back from taking my heads to get pressure tested at a local machine shop the specializes in engine building...Owner is only charging me 50.00 a head to check them. Took a look at the accessory drive pulley and started finding the marks.They had a layer of grime on them that made them...

New surprise under every bolt...I'm tracking down the injector cups and finding a good machine shop for the pressure test...That's a great analogy for the timing...and thanks again for the help Doug...I have spent many a restless night studying Will Wagner's #8 thread on injection and valve...

I agree with your statement of letting a pro handle the copper cup install issue...From what I've been told by some local diesel techs is that they have to be done with precision and only the correct tooling to achieve a good sealing surface against the head and injector body...Somewhat unsure...

Again thank you for the replies/info. How did you go about pressure testing the heads to reveal that the copper cups were indeed bad?...I have all the heads removed and cleaned up and had them checked for flatness at a machine shop where I work...Is that something you could do yourself or is it...

Sorry no pics yet...but its close to an inch or more longer then the non top stop. The injector hold down doesn't fit over it like the non top stop injectors that i removed today...I guess if they won't fit this year engine i'll try and return them for the correct set if they are available...I...

Hello...Just obtained my first military rig...I recovered a 1970 kaiser m818 w/winch with a 1970 nhc 250 cummins power plant from the lower part of ohio...Truck was only reading 1277 miles when I picked her up...Checked all fluids and headed for home about 300 miles away. 5 hrs and some change...