Wow!! This goes on and on.

As most everyone has said the most likely culprit is fuel system related.
In my experience air leaks are very rare except when the engines have been
recently serviced. If this started after servicing the fuel filters an air
leak is very probable.

Injector tips are another possibility. BTW, injector timing is critical to
a DDA running well. You should probably invest the few dollars for a timing
gage. If you own the engines for a while you'll need one.

These engines are so simple and easy to work on that you would do well to
take a course on them. You could learn everything you'd ever need to know
in about a 40 hour course. That would include a complete teardown and
reassembly phase with a tune up. IMO, these are wonderful engines for the
DIY inclined owner.

Butch
"Larry" wrote in message
...
Gary wrote in
news:C1EBf.325410$2k.236563@pd7tw1no:

There are valves.
Check:
http://www.yachtsurvey.com/comparing_diesel_types.htm

Courtesy of Detroit diesel!



He's right....Sorry.