|
11-20-2016, 07:07 PM
|
#1
|
Member
Join Date: Oct 2012
Posts: 47
|
Help, What the Heck Is This Part, What Does it Do.
Hi,
Here are the specs,
1997 Freightliner Liner Chassis
Tiffin Allegro Bus 32' DP
ISB C 275 24 Valve
We were returning from our last adventure and noticed that the unit in our MH that normally makes a buzzing/chipping sound started to increase it's interval of operation. Normally this makes a sound about every 40 seconds, now it's down to about every 10-15 seconds. This part is located on the front firewall and had a couple of wire leads and a small vacuum type hose attached.
I thought that it might be part of the compressed air system and dumped the chassis air and drained the tanks. No water was released on the tank drain.
The air pressure maintains it normal location on the gauge. Both needles at about 110-120 PSI with normal cutoff at 120 PSI
I started the MH back up and the interval was back to about 40 seconds or so. Now after taking it to refuel and dump the holding tanks, it back to 10-15 seconds.
I'm at a loss and concerned that this may be more important that I understand. Not knowing is not the best place to be on these complex beasts.
Attached is a photo, any information would be appreciated as we are supposed to leave the day after Thanksgiving.
TIA,
J R Setser
__________________
J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
|
|
|
|
Join the #1 RV Forum Today - It's Totally Free!
iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!
You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
|
11-20-2016, 07:14 PM
|
#2
|
Senior Member
Join Date: Oct 2013
Posts: 387
|
Looks a lot like a vacuum pump for the AC/heater controls. Normally has a ball shaped reservoir associated with it.
__________________
2005 Monaco Knight 40PLQ
2013 Ford Edge
|
|
|
11-20-2016, 07:19 PM
|
#3
|
Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
|
Quote:
Originally Posted by xydial
Looks a lot like a vacuum pump for the AC/heater controls. Normally has a ball shaped reservoir associated with it.
|
Exactly right. Diesels don't create a vacuum so they add a pump and accumulator tank to compensate. The accumulator tank is the "ball shaped reservoir" mentioned, they can also be other shapes but the ball is more common.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
|
|
|
11-20-2016, 07:35 PM
|
#4
|
Senior Member
Ford Super Duty Owner
Join Date: Aug 2012
Location: costa rica / river ranch fl.
Posts: 977
|
i see a white fitting is a hose missing ?
__________________
99 coachman catalina mbs-334
5.9 275hp dp
|
|
|
11-20-2016, 08:08 PM
|
#5
|
Member
Join Date: Oct 2012
Posts: 47
|
Help, What the Heck Is This Part, What Does it Do.
Hi,
Ok, yes there is a round ball shape attached at the end if the vacuum hose.
Does the increase interval mean that the pump is failing?
Could it be a vacuum leak in the hose or is the pump shot.
Where the heck would I get a replacement.
Glad to find out the coach will still stop when I hit the service brake.
Anyone have any additional insight.
TIA,
J R
__________________
J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
|
|
|
11-21-2016, 08:13 AM
|
#6
|
Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,678
|
Quote:
Could it be a vacuum leak in the hose or is the pump shot.
|
Yes (could be either). A cracked or disconnected hose is the most likely, however.
The position of the dash a/c & vent controls may have an effect on it, since the basic purpose of the vacuum pump is to operate the doors that open/close/divert air to various outlets, e.g. defrost vs heat vs vent or to control the air temperature mix.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
|
|
|
11-21-2016, 08:36 AM
|
#7
|
Member
Join Date: Oct 2012
Posts: 47
|
Thanks Gary,
I'll check on that right now.
You just have to love IRV2. Without the help I receive here, owning a MH would be much more expensive.
Once again, thanks to all the posters for your help,
J R
__________________
J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
|
|
|
11-21-2016, 10:09 AM
|
#8
|
Senior Member
Newmar Owners Club
Join Date: Jul 2016
Location: Somewhere out west
Posts: 467
|
Definitely a diesel vacuum pump. Looks identical to one I have installed several times....believe it or not it's the same part as the one in a C4 ZR-1 Corvette!
__________________
Mark, Peggy and Samson on the road full time
2016 Newmar Ventana 3709 and a 2016 Subaru Crosstrek
Real Life in the Cloud
|
|
|
11-21-2016, 01:32 PM
|
#9
|
Member
Join Date: Oct 2012
Posts: 47
|
Hi,
Following Gary's advice, I went out and cut 1" off of the vacuum hose running to the unit from the reservoir. The hose end was pretty brittle and this appears to have fixed the problem.
Thanks all,
J R
__________________
J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
|
|
|
11-21-2016, 02:06 PM
|
#10
|
Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
|
Quote:
Originally Posted by hooptie00
Hi,
Following Gary's advice, I went out and cut 1" off of the vacuum hose running to the unit from the reservoir. The hose end was pretty brittle and this appears to have fixed the problem.
Thanks all,
J R
|
Cool, that'll be $5.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
|
|
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|