Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 09-20-2015, 04:54 PM   #1
Member
 
Join Date: Jun 2015
Posts: 38
squealing noise from engine only between 45-55 mph

OK
1987 Establishment P30 454 engine
I get a high-pitched squealing sound ONLY between 45 and 55 miles per hour.
I cannot duplicate it by "gassing it" in park! Because it only happens driving down the road it's nearly impossible to pinpoint a location.(i might end up getting a neighbor to ride along and poke their head in the doghouse as we roll) What would cause such an RPM specific noise?? worn-out pulley? failing water pump? serpentine too tight or too loose? I'm grateful for any ideas!
__________________

__________________
Ryan7361 is online now   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 09-20-2015, 05:44 PM   #2
Senior Member
 
jacwjames's Avatar
 
Monaco Owners Club
Join Date: Jun 2014
Posts: 4,598
Sounds like a turbo problem, higher rpm's means 10X times that at the turbo.

I would check the connections from the exhaust to the turbo.

I would also check the connections to the CAC (charge air cooler) as the turbo pulls air through the CAC and pushed it to the intake side of the engine. The CAC could have failed and what you hear is the whistling of air being sucked in.
__________________

__________________
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is online now   Reply With Quote
Old 09-20-2015, 05:56 PM   #3
Senior Member
 
CJ7365's Avatar
 
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 1,524
Quote:
Originally Posted by jacwjames View Post
Sounds like a turbo problem, higher rpm's means 10X times that at the turbo.

I would check the connections from the exhaust to the turbo.

I would also check the connections to the CAC (charge air cooler) as the turbo pulls air through the CAC and pushed it to the intake side of the engine. The CAC could have failed and what you hear is the whistling of air being sucked in.
I would guess he does not have a turbo on a 454 gas motor

but OP your are in the right direction in checking pulleys and belt, my 454 does not have a belt tensioner, so I would just change out the belt, then go from there, usually if the water pump is going it will leak a little coolant out of the weep hole, this is on the bottom of the water pump, get a flash light and take a look, after vehicle has been running.
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
CJ7365 is offline   Reply With Quote
Old 09-20-2015, 06:11 PM   #4
Senior Member
 
mfire1339's Avatar


 
Monaco Owners Club
Workhorse Chassis Owner
Join Date: Jun 2008
Location: Glendora Ca.
Posts: 1,344
On my 1986 p-30 the alt belt had to be (REAL) tight!




Mike
__________________
2004 Monaco Monarch
Blueox, SMI, 1990 Wrangler YJ
mfire1339 is offline   Reply With Quote
Old 09-21-2015, 10:06 AM   #5
Senior Member
 
530ktm's Avatar
 
Join Date: Dec 2014
Location: Northern Arizona
Posts: 1,391
Are you running the A/C unit when this is happening? May be causing addition drag on belt and I agree with CJ7. If belt is old it may be glazed and squeal at times.

I can assure you that you do not have a turbo to be concerned about.
__________________
2014 Itasca Sunova 33C towing a Jeep JK Wrangler
530ktm is offline   Reply With Quote
Old 09-21-2015, 11:03 AM   #6
Member
 
Join Date: Jun 2015
Posts: 38
Dash AC compressor has been totally bypassed. I have a v-belt on power steering pump. Serpentine belt covers alternator, smog pump, and water pump.
__________________
Ryan7361 is online now   Reply With Quote
Old 09-21-2015, 11:18 AM   #7
Senior Member
 
jacwjames's Avatar
 
Monaco Owners Club
Join Date: Jun 2014
Posts: 4,598
CJ7635 is correct probably not turbo with 454 gas.

I tried to delete my response twice after posting and finally gave up. Good lesson on reading and understanding OP's question before responding, I HATE making mistakes or providing bad advice.

I agree that it could be a belt issue, after the vehicle gets warm the belt may expand/slip.
__________________
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is online now   Reply With Quote
Old 09-21-2015, 11:24 AM   #8
Senior Member
 
DonDee's Avatar
 
Join Date: May 2012
Location: Spring Valley AZ
Posts: 1,204
Quote:
Originally Posted by mfire1339 View Post
On my 1986 p-30 the alt belt had to be (REAL) tight!




Mike
Same here.
__________________
Don, Mary and Spooky
'00 Bluebird Skoolie Conversion
Geo Tracker/Dodge Neon/Aprilia Scooter towed
DonDee is offline   Reply With Quote
Old 09-21-2015, 09:21 PM   #9
Senior Member
 
slickest1's Avatar
 
Monaco Owners Club
Join Date: Jul 2011
Location: B.C.
Posts: 3,727
Also could be a vacuum leak. Check hoses from intake manifold.
__________________
Dennis & Marcie & Captain Hook The Jack Russell,aka PUP, 04 Dodge/Cummins 01 Citation 29.rk fifth wheel.RVM59
slickest1 is offline   Reply With Quote
Old 09-22-2015, 08:45 AM   #10
Senior Member
 
Join Date: Feb 2010
Posts: 4,493
Try forced downshift at speed to confirm which side of tranny making noise.

If changes then engine if no change running gear.


A friend recently had to change front rotor and brakes due to clogged brake line that would not allow caliber to fully rest. ..made same noise.
__________________
Tony & Lori
1989 Country Coach Savannah SE
TQ60 is offline   Reply With Quote
Old 09-23-2015, 07:25 AM   #11
Senior Member
 
Murf2u's Avatar
 
Join Date: Aug 2011
Location: Near Toronto, Canada
Posts: 1,842
If you have a clutch fan check it. They are notorious for howling or screeching at a certain speed as they're failing.
__________________
Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).
Murf2u is offline   Reply With Quote
Old 09-23-2015, 07:59 AM   #12
Senior Member
 
Ford Super Duty Owner
Join Date: Jan 2011
Location: Lowell, Arkansas
Posts: 4,693
Putting anything on the back of a belt like: spray belt dressing, bees wax, candle wax, will for a short time change the coefficient of friction and the belt will usually stop squeaking if it's a belt. Very simple diagnostic practice. I do not recommend any of those as a FIX just a diagnostic technique to narrow down the problem.

JFYI, The tension on belts should not be REAL tight. REAL tight means some of the bearings in the devices being spun by the belt may have to much excessive side forces placed on them and may fail earlier than designed.

There is a specific way of determining the correct belt tension. They do make belt tension gauges but i never owned one. You just know from experience how tight to make them. Some would say 1/2" deflection in the center of the belt. That's not always easy because most belts have various distances between pulleys. I'm a fan of the serpentine belt and the the automation belt tension pulley. That does take the guess work out of the equation and the tension is good for as long as it and the belt hold up.

A serpentine belt can't be to tight only to loose if the spring in the tension assembly is weak. There is a bearing in that tension pulley that might be the cause of the noise. The dynamics of the belt and the tension-er do change based on current (alternator) demand, speed, load, centrifugal forces on the belt etc. That may be why the noise is speed (RPM's) specific.

TeJay
__________________

__________________
TeJay Auto Instructor/4-yrs USAF/ Liz: RN/ WBGO 2014 Vista 30T/ F-53/CHF/5-Star/Koni * Bella & Izzy * Golden /Cocker mix/ Louie The Cat* All Retired
TeJay is offline   Reply With Quote
Reply

Tags
engine, noise



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
Engine compartment noise for 2006 fleetwood jamboree 23.5 Cusick4 Fleetwood Products Owner's Forum 4 09-08-2015 12:25 AM
Engine noise rodz Ford Motorhome Chassis Forum 32 08-28-2014 10:02 PM
Squealing belt noise on 03 Dutchstar r vernerey Newmar Owner's Forum 6 08-19-2014 10:12 AM
Wiring Coach vs Engine batteries lpasekof Winnebago Industries Owner's Forum 6 05-20-2014 06:48 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:58 AM.


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