Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-16-2008, 11:24 AM   #1
2 Rivet Member
 
philippes's Avatar
 
1994 36' Classic 36
Cincinnati , Ohio
Join Date: Oct 2006
Posts: 32
Images: 1
Engine noise when driving

I need some help.
When I am "full gas", the engine is fairly noisy on my 1994 MOHO. When the belt fan clutches, it is also very noisy. Who knows if it is normal on those MOHOs and if there is a solution to reduce the noise.
At the beginning, it was worse and we have found a crack exhaust manifold and a lack of tune up of the engine. Those issues have been fixes. It is just noisy while driving.
When I put the cruise control, the device has a trend to go often also on full gas position as soon as there is a slope. Again, more noise.

Thanks for your help,

Philip
__________________

__________________
philippes is offline   Reply With Quote
Old 08-16-2008, 11:49 AM   #2
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,192
The howl from the fan clutch is normal, unless it howls all the time, cold or hot. That would indicate a siezed clutch, and would require replacement.
__________________

__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 08-16-2008, 12:35 PM   #3
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,354
I agree with Terry, sure sounds like a fan clutch. I'd eliminate that possibility before looking any farther.

When that fan clutch kicks in it can sound like turbo kicking in at times (without the added boost of course ).

Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is offline   Reply With Quote
Old 08-16-2008, 01:45 PM   #4
Rivet Master
 
guy99's Avatar
 
1984 31' Airstream310
Dunsmuir , California
Join Date: May 2004
Posts: 1,336
Images: 16
If you establish that your engine is operating properly, you may find that improving the sound insulation on the dog house and the 'cockpit' floor (raised area where the driver and passenger seats mount) can reduce the noise quite a bit. The air cleaner also has a role in reducing the noise of the throttle sucking large quantities of air and fuel.
__________________
If you want others to be happy, practice compassion.
If you want to be happy, practice compassion - The Dalai Lama

1984 310 Limited Motorhome
Courtesy Parking (W/S/E/Wi-Fi) on I-5 in Northern California, 70 miles from Oregon border
guy99 is offline   Reply With Quote
Old 08-16-2008, 03:11 PM   #5
Rivet Master
 
Pop Rivet's Avatar
 
1990 25' Airstream 250
Altoona , Georgia
Join Date: Aug 2005
Posts: 805
Images: 5
When you say full gas, I assume you mean full throttle and if so, the noise is most likely caused from the rush of air being sucked into the engine. Solution - stay out of the mountains
__________________
Pop Rivet is offline   Reply With Quote
Old 08-16-2008, 05:16 PM   #6
Vintage Kin
 
slowmover's Avatar
 
Fort Worth , Texas
Join Date: Nov 2006
Posts: 7,583
Images: 1
Trucks are simply noisier. The diesel forum guys have had luck with lead foil sheeting from Mc master- carr
__________________
1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 9-cpm solo, 15-cpm towing
Sold: Silver Streak Model 3411
slowmover is online now   Reply With Quote
Old 08-20-2008, 02:22 AM   #7
4 Rivet Member
 
Chuckles's Avatar
 
1983 31' Airstream310
Iwerne Minster , Dorset. UK
Join Date: Aug 2005
Posts: 270
My 310 was noisy, but can be attributed to the viscous fan (clutch stuck on).
I replaced the lot with electric fans, and presto! it is like driving a car......

Not only is it quieter, but the engine is more responsive and it gave me about another 1-1.5 mpg on average
__________________
Chuck
Dorset UK

Don't take life so seriously.... it is not permanent!
Chuckles is offline   Reply With Quote
Old 08-21-2008, 07:15 AM   #8
2 Rivet Member
 
philippes's Avatar
 
1994 36' Classic 36
Cincinnati , Ohio
Join Date: Oct 2006
Posts: 32
Images: 1
You are hitting the nail on the head. It is a combinaison of the three.
#1 the clutch, on/off to cool down the engine. Very distinct noise. I was wondering if there is an opportunity to add an extra water cooling system (I seen some with a bank something system that add extra power) that will further cool the engine and does not require to clutch the fan so often
#2 the overall noise going through the dog house and the floor: what I am reading is that I should try additional insulation
#3 full throttle: this one is really very noisy and I am wondering if it is normal. It makes a deep noise. As soon as there is some sloop on the interstate, basically, you must be almost full throotle. I think that those Airstream were underpower.

Thanks for all the advises,

Philip
__________________
philippes is offline   Reply With Quote
Old 08-21-2008, 08:03 AM   #9
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,192
At full throttle, the deep howling roar is the sound of air and fuel getting dumped into the air intake, and that is more or less normal. You have a 36 foot long motor home, which is very heavy, so it takes a lot of muscle to get it rolling. Most RV's use an RV ground cam to increase torque and fuel economy, at the expense of top speed (horsepower) As you know, torque is how much "stuff" an engine will move, and horsepower is how fast it will move it.
As for the fan, you can remove the fan and fan clutch, and install an electric radiator fan, and save some effort of the engine.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 08-21-2008, 03:24 PM   #10
Rivet Master
 
mustang's Avatar
 
1986 31' Sovereign
Kent , Ohio
Join Date: May 2006
Posts: 803
try taking your hand (with the engine off) and rotate the fan, if it moves freely or with minnimal resistance it is fine and probably a result of the thermal spring engageing it. When you say full gas that beast is making horsepower and heat. What is your temp guage saying if it goes up then the noise happens then comes down it is normal esspecially if it is hot outside.
__________________
mustang is offline   Reply With Quote
Old 08-21-2008, 05:42 PM   #11
Rivet Master
 
Pop Rivet's Avatar
 
1990 25' Airstream 250
Altoona , Georgia
Join Date: Aug 2005
Posts: 805
Images: 5
If your MH is newer than a 1990, it may well have electric cooling fans
__________________
Pop Rivet is offline   Reply With Quote
Old 08-23-2008, 09:21 PM   #12
Vintage Kin
 
slowmover's Avatar
 
Fort Worth , Texas
Join Date: Nov 2006
Posts: 7,583
Images: 1
You won't see electric fans on a big truck, they simply can't move the air. The mechanical fan, clutch, and associated radiator shrouding is designed to work together. I wouldn't change it (though I would see about replacing those components; and/or sealing the shrouding better). Outguessing factory engineers on drivetrain cooling is a bad idea. The thermal loads can be tremendous.

Just because someone else is "okay" with a change is not sufficient reason, not to mention lack of proper testing.

The ADDITION of a helper, or pusher, fan may work to keep the bigger fan from cutting in "prematurely".

It's a truck, it's meant to work. Enjoy it. Understand that you are overpowered on the flats, and only somewhat underpowered on hills. You'll establish a rhythm in time, just stand on that thing EARLY to get it cooking properly!
__________________
1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 9-cpm solo, 15-cpm towing
Sold: Silver Streak Model 3411
slowmover is online now   Reply With Quote
Old 08-24-2008, 12:38 AM   #13
2 Rivet Member
 
Olielulu's Avatar
 
1972 25' Tradewind
Webb Lake , Wisconsin
Join Date: Aug 2007
Posts: 46
Images: 29
solution

the best solution for all of this is to buy a really good stereo system and turn it up louder than the noise that the engine is making!

Ignorance is bliss.
__________________
Olielulu is offline   Reply With Quote
Old 08-31-2008, 11:16 PM   #14
Rivet Master
 
mustang's Avatar
 
1986 31' Sovereign
Kent , Ohio
Join Date: May 2006
Posts: 803
I am intrested what was it and how did you fix it?
__________________

mustang 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
Scraping Noise under MH spat61 General Motorhome Topics 14 02-19-2008 07:32 AM
Engine Noise Level philippes Classic Motorhomes 3 08-19-2007 07:00 AM
Fan noise flyguy 2005 and newer - Bambi all models 2 07-29-2007 01:00 AM
Noise flyguy Batteries, Univolts, Converters & Inverters 5 06-07-2007 05:56 AM
engine noise 77 R GO C MH Airstream Motorhome Forums 9 05-10-2004 07:46 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:49 AM.


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.