Originally Posted by brewer00
We just picked up a 1982 diesel 280 and being new to the diesel engine I was curious what RPM I would expect to run @ 55mph. I'm assuming that it has a stock transmission and we are running around 3000 RPM. It seems/feels like I should have another gear and seems a bit high as my tach only goes to 4000.
The first thing I would question is the tach. The tach on our gas 310 motorhome is extremely flaky. I've been meaning to replace it but haven't had the time. What I would suggest is getting an independent verification that the tach is working properly.
Just a thought.
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)