I was reading some of the boat forums and the 6V92 guys were discussing checking/adjusting the valves and injectors. In an RV application is this something to look at doing? I'm sitting at approx 130,000 miles, mine sounds good, runs good, just a puff of white smoke on a cold start. Just leave well enough alone...?
Peter I asked the same question when I had my Eagle and most of the Detroit guys I know and know there product say that you need to run the rack at or about 100,000 miles. We have 114,000 on our 92 u300 however it was a fresh motor when we bought it last year. The Po smoked the motor due to leak in turbo intake. Not an expert just things I have heard in the Bus world.
Peter,
I think the theory is it catch any problem before there's damage. There is a 92 valve adjust procedure in the media section of the forum if you don't already have it. My experience is most valve adjustments result in little to no actual adjustment but it does tell you nothing is wearing abnormally.
P.S. I don't believe there any adjustment to the injectors since they are electronic.
I run the overhead in my semi with my 60 series detroit at 100,000 about once a year . usually find one or 2 valves out by a bit.
Attached is a PDF on how to do it. Good idea to check after 100,000. Dropped valves is not the problem that 4 cycles have as the 2 cycle runs about 150 degrees lower EGT. White smoke normal at start. You could check the injectors with a Pro Link 9000. Does it all by plugging it into the under dash connector and only takes a minute or so. If running well, they are probably fine.
Pierce
The 6V92 are pretty sturdy. I had Berndt, in NAC, check my rack in 2013 with 164000 miles on it. It was perfect and required no adjustment.
I leave my Pro-Link plugged in all the time. After a trip when I park I can idle up to 1000 rpms and run an injector/cylinder cut-out test during the 5 minute cooling off period. You can also check your trip data and mpg at any time. It keeps the historical data intact and you can reset the trip data for each trip and make print-outs for comparative purposes. I really like the accurate reading of the coolant temperature. Mine shows about 5-8 degrees hotter than the dash gauge. It's a great tool to have if you can get your hands on one. ^.^d
Jerry
You have a DDEC engine? If so, there is no "rack".
FWIW,
keep in mind that in a marine application Detroit's are running at continuous RPM 99%+ of the time and that once adjusted
to their proper spec., rarely need anything more than checking unless something is going away (rarely injectors.)
Personally, the only occasion I've had issue with a Detroit was decades ago (60s) when after rebuilding the blower, my father decided to check out my work and let the Roots swallow a shop towel... after another one was installed, I put the breather
in place before he did it again... pc
While our DDEC II Detroits don't have rack as the mechanical Detroits do, it has become a catch all phrase for checking the injectors with a diagnostic tool like the Pro-Link, adjusting the valves, etc. Have even heard running the rack applied to Cummins and CATs. Sort of like carburetor day at Indy before the race even though the race cars don't have carburetors any longer.
Pierce