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Topic: Detroit 6V92 questions (Read 1350 times) previous topic - next topic

Detroit 6V92 questions

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 and Tammy Fleming
1991 U300 GV 40 - Sold, owned for 4 years
Downsized to Roadtrek Popular 210 class B

Re: Detroit 6V92 questions

Reply #1 –
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.
Andy & Eileen
MONTROSE COLORADO
1992 U300  40' 6V92 TA
2016 4 Runner
1998 Jeep Grand cherokee

1998 Jeep Grand Cherokee) Build # 4135 Skp# 122921

Re: Detroit 6V92 questions

Reply #2 –
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.
John Fitzgerald
1991 U300 (SAI) Side Aisle Island Bed 40'
Detroit 6V92 with Allison Retarder
Meridian (Boise), Idaho

Re: Detroit 6V92 questions

Reply #3 –
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.
91 GV U300 Unihome 40' Build 3811
6V92TA Detroit

Re: Detroit 6V92 questions

Reply #4 –
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

Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Detroit 6V92 questions

Reply #5 –
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.
The selected media item is not currently available.Kent Speers
Locust Grove, OK
1993 U300 SSE 40' (Restored at FOT 2009) Build 4323
720 watts Solar
6V92TA DDEC Silver Engine
2014 Subaru Outback

Re: Detroit 6V92 questions

Reply #6 –
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
The selected media item is not currently available.
Jerry and Cindy Maddux
1993 U300/36WTBI DD6v92TA
build 4271  "Miss Lou"
1995 suzuki sidekick 4x4 toad
Gulfport, Ms

"Pride of Ownership"

Re: Detroit 6V92 questions

Reply #7 –
Quote from: Kent Speers –
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.

You have a DDEC engine? If so, there is no "rack".
1998 U270 34'

Re: Detroit 6V92 questions

Reply #8 –
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
S/W Houston 95" U320C SE/40' 
Build #4778  Cummins M11
Repairs & Covered RV Parking (BAO)
PPL is close..
 

Re: Detroit 6V92 questions

Reply #9 –
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
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)