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Another D2 experience

On our last trip I had trouble with the coach building air pressure.  Had it on high idle and it still did not build full air pressure.  I turned off the engine and went out to listen for leaks- nothing.  Tried again and she finally built up pressure, everything seemed to work, so we drove on to Yuma, AZ.  Concerned about this I started reading about it in a great knowledge filled area- this forum.
My conclusion is that the D2 could be going bad and since I like to start with simple solutions, I went out today and got one from NAPA $19 like has been said on the forum before.

A friend of mine who has an old MCI ( got your attention Dave M.??) said he would come over and help me change it out as he has experience in doing it.  I got things ready for him to come over and decided to try to break lose the nuts on the D2.  Wow, they were not tight, I didn't have to use any force to loosen them.  I stopped at this point and when Dan came over we talked about it.  He thought the same thing I did- if the D2 was not tight, that could be where the air leak is.  We tightened it up, I fired it up and air built up right away.  Problem solved.

Lesson learned- if having issues with air pressure, check for tightness of D2 before replacing.

I am keeping the D2 I bought for a spare just in case.
Ted & Karen
2001 U270 36' - sold after 12 years full timing

Re: Another D2 experience

Reply #1
Glad you figured that out.  I like to start with the simple, obvious stuff first.  Sometimes I have no idea what that is though.  Thanks for the good tip.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Another D2 experience

Reply #2
Can I ask a dumb question?
 What is D2
Robert and Susan
 1995 36' 280 WTBI 8.3 3060r
 1200 watts on the roof, 720 Ah of lithium's
 Build # 4637. Motorcade # 17599
        FMCA  # 451505
        18  Wrangler JLUR

Re: Another D2 experience

Reply #3
It is the engine-mounted governor regulator.  It controls the air supply to the coach air systems.
Regards,
Brett

'99 42' Foretravel Xtreme
'14 Brown Motorsports Stacker
'05 Chevy SSR
'02 BMW R1150R

Re: Another D2 experience

Reply #4
Can I ask a dumb question?
 What is D2
Bob,
on ours it is located on the frame to the curb side of the engine block, to the rear and above the transmission cooler.
I am going to purchase one from NAPA and keep it in the coach, for $20 its good insurance. Easy to replace.
Justin & Cathy Byrd
1995 U280 "Old Faithful"
36' Build #4673
C8.3 Cummins
Allison MD3060R 6 speed - retarder
Powertech 10KW  4cyl Kubota

 

Re: Another D2 experience

Reply #5
More info on D2 here:

Haldex D2 Governor Service Data
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"