I have an 1835B with a diesel I'd like to adjust the valves on. There's so little room around the timing cover to find the mark. I seem to remember there being a way to do it without needing the timing mark. A method called the over/under method or something like that. Somewhere I saw it as an alternative and supposedly better method to check the valves on our Cummins or any inline diesel. Can anyone enlighten me?

I ve done a method of rolling over till I find the compression stroke where both valves of that cylinder are closed. Like on 12V Cummins engines I tend to use this because most trucks the pin is broken or jammed. I just roll the engine over using the alternator and watch the valve train. Starting with 1 and 6 since they are running mates. Then 2 and 5. Then 3 and 4. 

Found 2 ways searching Google. The 188D is a 4cyl engine. Alt. nut won't turn it over (tiny V belt) but Case used their heads and broached a 1/2" square drive in the crank nose. Turning over until #4 ex. closes and in. just starts to open (overlap) #1 can be adjusted. then #2 for #3 and #1 for #4. I set them using this method. Then there is the rule of 9 method. looking at the engine from the front the first valve is #1, second #2 and so on. When #1 is down you can adjust #8. 8+1=9. Then when #2 is down you can adjust #7. 7+2=9 and so on. I double checked them using this method and they were very close. Like within .001". It's much quiter now and seems to start better too.