Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-13-2006, 07:46 AM   #1
Senior Member
 
Jim&MaryJo's Avatar
 
Join Date: Jul 2005
Location: Anaheim Hills, CA
Posts: 381
Toured the Colorado Rockies last month. On steep grades, temp readings seemed to go a little high.

After a read of the Cummins and Coach manual, it appeared the Cummins ECU should light a "temp warning" idiot light at 205 degrees and further sets a "maximum allowable" temp at 212 degrees, which --if programmed-- would initiate an engine shutdown.

Put a call into Mark Hara (great help in the past on technical issues). Mark advised the temp gauge can be off by 10-15% (not sure if that's of range or value) and the ECU 205 setpoint would be more accurate (which never lit up on my trip).

AT this point, I'm cautiously concluding my temp gauge reading on grades of well over 205 was inaccurate and I never hit over 205??

I have 2 questions:

Has anyone seen an over-temp idiot light (or other similar Silverleaf indication) on when running?

And, there's an implication in my Cummins manual that the ECU will protect the motor under high IAT/temp conditions, regardless of FIG (Mike's moniker for pedal mashing). My last diesel had this feature and would override FIG and back off fuel/power. Anyone experience this after the idiot light lit?

Thanks for any replies...
__________________

__________________
2004 Alpine 34 FDDS
Anaheim Hills, CA
Jim&MaryJo is offline   Reply With Quote
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!

Old 08-13-2006, 07:46 AM   #2
Senior Member
 
Jim&MaryJo's Avatar
 
Join Date: Jul 2005
Location: Anaheim Hills, CA
Posts: 381
Toured the Colorado Rockies last month. On steep grades, temp readings seemed to go a little high.

After a read of the Cummins and Coach manual, it appeared the Cummins ECU should light a "temp warning" idiot light at 205 degrees and further sets a "maximum allowable" temp at 212 degrees, which --if programmed-- would initiate an engine shutdown.

Put a call into Mark Hara (great help in the past on technical issues). Mark advised the temp gauge can be off by 10-15% (not sure if that's of range or value) and the ECU 205 setpoint would be more accurate (which never lit up on my trip).

AT this point, I'm cautiously concluding my temp gauge reading on grades of well over 205 was inaccurate and I never hit over 205??

I have 2 questions:

Has anyone seen an over-temp idiot light (or other similar Silverleaf indication) on when running?

And, there's an implication in my Cummins manual that the ECU will protect the motor under high IAT/temp conditions, regardless of FIG (Mike's moniker for pedal mashing). My last diesel had this feature and would override FIG and back off fuel/power. Anyone experience this after the idiot light lit?

Thanks for any replies...
__________________

__________________
2004 Alpine 34 FDDS
Anaheim Hills, CA
Jim&MaryJo is offline   Reply With Quote
Old 08-14-2006, 06:38 AM   #3
Senior Member
 
Danny Gayhart's Avatar
 
Join Date: Feb 2002
Location: Surprise, AZ, USA
Posts: 355
I can tell you from first hand experience you can't trust the idiot light. I though I had an overheating problem for years. After many calls to WRV and Cummins I solved it on my own. I bought a SilverLeaf to track temp. My idiot light would come on at 200! According to experts you can run a Cummins diesel all day long at 212, some say as high as 224.

SilverLeaf confirmed my suspicions. I now ignore the light. According to the SilverLeaf my temp never goes above 205. On the subject of shut down, Cummins has disabled that function in our coaches. Since you own a 34ft overheating is the least of your worries, try fuel prices!

Danny
__________________
Danny & Claudia

2000 Alpine Millennium Edition
Danny Gayhart is offline   Reply With Quote
Old 08-14-2006, 02:29 PM   #4
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
Jim, On my last diesel rig there were 2 temp sending units, one for ECU & other for temp gauge on the dash. Our light = 3 reporting functions (including Silverleaf & gauge) which could be accomplished on less than 3 senders. Presumably the ECU sender would be the more respected device. Under the theory that w/one watch I know the time, but w/two watches I don't, having more than one sender puts us in the position of having to worry which reporting path is working. I haven't determined whether we have multiple senders yet, but Danny probably knows.
Dan- IIRC you did your own Silverleaf install, no? What did you hook to for coolant temp input?

I hate being called an idiot. Specially by a dumb light.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 08-14-2006, 05:10 PM   #5
Senior Member
 
Danny Gayhart's Avatar
 
Join Date: Feb 2002
Location: Surprise, AZ, USA
Posts: 355
SilverLeaf gets data from engine and trans through diagnostic port under the dash. I run the pc based model.

Danny
__________________
Danny & Claudia

2000 Alpine Millennium Edition
Danny Gayhart is offline   Reply With Quote
Old 08-17-2006, 03:21 AM   #6
Senior Member
 
Join Date: Jun 2005
Location: Abington, PA
Posts: 1,103
We have just returned from the Charlotte, NC pre rally where we were affordr a question & answer period with Cummins, Allison,Onan.,Silverleaf, HWH & Onan. I believe that Cummins considered an overheat @ 260?. I am still a poor believer in Silverleaf and I did not feel that their representation at Charlotte was very convincing.
__________________
Ted & Carol Ulmer
2005 Alpine 34', 34FDDS
2006 PT Turbo pusher
Ted III is offline   Reply With Quote
Old 08-17-2006, 06:27 AM   #7
Senior Member
 
Jim&MaryJo's Avatar
 
Join Date: Jul 2005
Location: Anaheim Hills, CA
Posts: 381
This is all very confusing....

I would think the Cummins Manual would be "reliable"; it says the maximum "allowable" temp is 212.

I interpret their choice of words to mean the ECU takes preventative action at that temperature, which the manual indicates is a warning followed by a delayed programmable engine shutdown.

The Alpine manual says the idiot light comes on when the motor temp is out of range (185-205), which coincides with the Cummins manual.

Not stressing over this, just have an inquiring mind and wanted to validate what appears to be a temp gauge that reads high, apparently by ~10-15 degrees.
__________________
2004 Alpine 34 FDDS
Anaheim Hills, CA
Jim&MaryJo is offline   Reply With Quote
Old 08-18-2006, 09:02 AM   #8
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
Jim,
My Actia speedo has a preset and constant 2mph minimum, adding 2mph to velocity at all times (great for fuel economy while parked). Maybe your temp gauge has a similarly fictitious 12 degree "boot" in the reading.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 08-18-2006, 02:31 PM   #9
Senior Member
 
Jim&MaryJo's Avatar
 
Join Date: Jul 2005
Location: Anaheim Hills, CA
Posts: 381
__________________

__________________
2004 Alpine 34 FDDS
Anaheim Hills, CA
Jim&MaryJo is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel gauge accuracy danes-on-tour Monaco Owner's Forum 13 07-18-2017 10:30 AM
Temp Gauge jsede MH-General Discussions & Problems 8 08-20-2008 10:14 PM
LP Gauge Accuracy? Ding-a-ling Winnebago Industries Owner's Forum 3 01-03-2008 04:15 PM
Temp. Gauge pilot81 Workhorse and Chevrolet Chassis Motorhome Forum 12 12-10-2006 07:30 PM
temp gauge & fuel gauge indicators antlerz MH-General Discussions & Problems 9 02-16-2006 06:34 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:56 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.