Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-18-2002, 09:59 PM   #1
New Member
 
islandvu3@cox.net's Avatar
 
Join Date: Mar 2002
Posts: 3
Unhappy Isuzu Diesel

I have a 1983 classic 31ft motorhome that does not have enough power. It will only run 61MPH on flat ground and it is hard to get it to that point. I have changed the fuel filters, several times, air filter. I use injector cleaner, so don't think my injectors are dirty. It also runs hot when it works hard on extreme grades. The boost only goes to 7.5 lbs--thats all I can get out of it. Exhaust temp runs 1000-1100 degrees. Do the injectors have a filter inside of them? This is my second deisel motorhome and this one does not run like the 1982 airstream. this is the same basic motorhome only difference being the length. The 1982 would run at 78MPH and this one is lazy--what puzzles me is the boost and RPM. can anyone help me? South Dakota is looming on the horizon.
__________________

__________________
islandvu3@cox.net is offline   Reply With Quote
Old 03-18-2002, 10:37 PM   #2
Airstream Driver
 
PeterH-Airstreamer's Avatar

 
1997 30' Excella
1983 31' Airstream310
Austin , Texas
Join Date: Feb 2002
Posts: 3,375
Images: 51
Welcome aboard!
There is a member on this board, LKappenman, who has 31' Diesel and experienced similar problems.
Try to contact him by going to the members list on the top of this page, click letter L and then on his name, to send him an email.
Maybe you could continue a good thread on Diesel MHs?
__________________

__________________
PeterH-Airstreamer is offline   Reply With Quote
Old 03-19-2002, 09:14 PM   #3
4 Rivet Member
 
Join Date: Feb 2002
Posts: 334
Images: 3
Engine performance...Diesel

All devices are not created equal. This is very true for the mechanical world. Nearly no two cars, trucks, or motor hames will operate exactly the same under the same conditions. In many cases the power, economy and longivity are determined by checking for the optimum adjustments and tweaking to get everything just right. Most engines run so well that the ultimate tune condition or performance equiptment is included. There are many areas to check. In diesels, the requirements are the same as gas with no spark to consider. Diesel engine performance can be improved with unobstructed intake and exhaust, turbo and larger turbo, increase injection pump fuel delivery and advance pump timing. All performance modifications MUST be monitored. Power is HEAT which must be observed. A pyrometer is a must with a trans temp gage. Removing any exhaust restrictions, and increasing pipe size, is the cheapest instant power increase. As power increases, the heat increases as well. The trans should also have some attention with a shift kit, trans program, increase oil pan capacity, in line exterior oil filter, oil cooler relocation and maybe fan forced cooling. Many performance oriented folks used only all synthetic auto trans fluid. The torque of a diesel engine can be very very high. It may take some relearning. A single 3 inch exhaust will flow more volumn than dual 2 inch exhaust. All 5 inch exhaust with no muffler or cat turned down before rear axle is the best flow for diesel performance, power and economy. When there is lots of power all the throttle is not needed???. Frank Idaho
__________________
Visit Idaho The people are great
FrankR is offline   Reply With Quote
Old 03-19-2002, 09:22 PM   #4
4 Rivet Member
 
Join Date: Feb 2002
Posts: 334
Images: 3
Our other RV...1967 GMC 4107 Greyhound

A picture of our bus repower and auto trans install. This will be great to pull the Kand Yacht... Frank
Attached Thumbnails
Click image for larger version

Name:	6v92ta into 4107 gmc.jpg
Views:	552
Size:	29.2 KB
ID:	45  
__________________
Visit Idaho The people are great
FrankR is offline   Reply With Quote
Old 03-19-2002, 09:37 PM   #5
Airstream Driver
 
PeterH-Airstreamer's Avatar

 
1997 30' Excella
1983 31' Airstream310
Austin , Texas
Join Date: Feb 2002
Posts: 3,375
Images: 51
I want to sit on the side of the road, when Frank goes by.
A greyhound pulling a 31' Land Yacht
Only in America!
__________________
PeterH-Airstreamer is offline   Reply With Quote
Old 03-19-2002, 09:46 PM   #6
4 Rivet Member
 
Join Date: Feb 2002
Posts: 334
Images: 3
Greyhound pullin' an Airstream??

Hey, wait a minute....... The bus is just 36 feet and the Airstream is 31 feet. That is great, as the limit is 70 feet over all. Let's see the power would be there and lots of everything. I posted the idea as a little humor but I think it can be done........ Fran
Attached Thumbnails
Click image for larger version

Name:	gmc 4107 side view.jpg
Views:	440
Size:	21.0 KB
ID:	46  
__________________
Visit Idaho The people are great
FrankR is offline   Reply With Quote
Old 03-20-2002, 12:48 PM   #7
Finally Retired
 
, Washington
Join Date: Feb 2002
Posts: 152
Images: 1
Isuzu Deisel

We had the exact thing on our 310 Turbo Isuzu for 7 years we love the coach but when we headed back to South Dakota and pulled those passes no power and heating up. No problem on the flat lands . A couple of months ago we took it to a place near Seattle and had them check it out. They first increased the fuel pressure and checked out obvious things that barely helped, then we took it back and they cleaned our injectors they were bad they were low on pop off pressure and the spray pattern was bad,(the previous owner who bought the coach new did not know there were two fuel filters) we also had them adjust the valves while they were in there. Then they found we had bad intake manifold gasket. They tightened the alternator belt and hose clamps that were leaking coolant. We had more boost bay 2-3 pounds making it 12 but still high on the exhaust temp we found we had a bad Pyrometer Guage changed that a wow what a differance.
Regarding the over heating it never did when we were on the flats of small hills only on the long pulls. After talking to the people at Expert Deisel.com they said that probably it was "airflow management" he asked if we had a schroud over the fan No, do we have a fan clutch no, those were recomendations he had also not to the the anti-freeze water mix over 40-60. We had previously re done the radiator.
Our next project is to put on the Gear vendor under/overdrive. But we are very happy with the performance now. LKappenman@aol.com
__________________
LKappenman is offline   Reply With Quote
Old 10-28-2002, 12:53 PM   #8
2 Rivet Member
 
stuart1's Avatar
 
Join Date: Oct 2002
Posts: 24
lost radiator cap

Good stories all! I also have the Isuzu turbo Diesel but I need to replace her radiator cap however, the old one doesn't have the PSI written on it. Does anyone know the correct PSI rating to use?...Thanks..Stuart 3052
__________________

__________________
Tuey
stuart1 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
Poll: Isuzu Diesel MH - Would you do it again? ViewRVs Mechanics Corner - Engines, Transmission & More... 4 08-14-2013 02:51 PM
Isuzu Turbo Diesel Fred Airstream Motorhome Forums 13 04-03-2007 10:47 AM
Isuzu Diesel fan shroud dienst1 Mechanics Corner - Engines, Transmission & More... 3 08-14-2003 10:18 PM
1981 Isuzu Diesel Engine jpurdy Mechanics Corner - Engines, Transmission & More... 10 11-30-2002 11:14 AM
isuzu diesel islandvu3@cox.net Airstream Motorhome Forums 0 03-19-2002 10:48 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:05 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.