Clacking Noise in the engine

[Seangie]

Hey All -

The turtles are on the road here still in Boston.  Trying to troubleshoot a "clacking" sound in the engine.  I've uploaded a video down the bottom so you can hear it.  It seems to be coming from the drivers side of the engine.

It doesn't make the noise upon first start. The noise seems only to appear after turning on the high idle.

I have thoughts on what it might be but don't want to complicate the issue.  Let me know what you think.  We were hoping to be headed back by Friday but would like to get this figured out before I drive anywhere else.

Thanks for your help.

-Sean

https://www.youtube.com/watch?v=6xsnqHYSz5c


www.herdofturtles.org
1984 Eagle Model 10S

[Len Silva]

Does the noise change when the compressor is loaded?  Have someone pump the brakes until the compressor kicks and listen to it..

[gus]

Make sure the unused pulley on the left side (Driver) is not loose.

It takes a huge amount of tightening torque and often loosens.

[OneLapper]

Where abouts in Boston are you?   I might be able to lend an ear.  

Edit:  sounds like the compressor. I have good spare compressor that should work.  It came off a 8V71.  Maybe someone can confirm it'll fit.  

[TomC]

Sounds like the compressor. Take a long screw driver and use it like a stethescope. Put the screw driver on the compressor then put the handle up to your ear.

Funny thing about air compressors-they can make noises for years, and still pump oil free air. Or they can make no noise and come apart. Is it pumping oil? Good Luck, TomC

[Seangie]

Does the noise change when the compressor is loaded?  Have someone pump the brakes until the compressor kicks and listen to it..

Len,

Good question.  I let the bus run for about 15 minutes on high idle and the bus never aired over 110 lbs or so and I've got it set to kick out at about 125 I think (its never taken more than 10 minutes to air up on high idle).  Hard to tell if the pressure gauge is correct as its analog and labeled at 100 and 150 with a mark in between.  I figured that was the 125 mark and set the governer to kick there but the safety relief valve(rated at 150psi) that is on the air dryer was releasing before the air dryer during our trip.  I was going to adjust the governer and address the clacking today but now the air only goes up to just above the 100 mark.  I'm going to try and turn the governor way down later to see if I can get it to kick at 85 and see if that turns off the compressor and stops the noise.  

Where abouts in Boston are you?   I might be able to lend an ear.  

Edit: I have good spare compressor that should work.  It came off a 8V71.  Maybe someone can confirm it'll fit.  

Mark - we are in Foxboro right next to the stadium.  Ill pm u my phone number.  Thanks for the offer...huge help.

-Sean


www.herdofturtles.org
1984 Eagle Model 10S


www.herdofturtles.org
1984 Eagle Model 10S

[OneLapper]

The stadium is a few miles from my grandparents!  I know the area well. 

[luvrbus]

Have someone turn the steering and you listen if it stops you have lost the fiber coupling between the pump and the drive could be several things including a blower I hope not for your sake

good luck

[Seangie]

Clifford -  I am praying its not the blower...  I started the bus again to take another listen.  It was a slow draggy start almost like something was stuck.  It did start up though and I ran it for a few minutes.  The clacking is with the engine,  I just don't know enough to figure out where its coming from.  I turned the wheel left and right and it didnt make a difference.  I did notice on the drive up that in the morning after driving all night it was tough to steer and made a wining noise...and I thought it was the tranny cause of the cold or maybe the steering.  Anyways - I stopped the engine and let it sit for a few minutes and now it won't start at all.  No smoke either.

Here is a video of the start if it helps...
https://www.youtube.com/watch?v=8guu-xVOCtU

We are truly grateful for all of your help and input.  We are praying and trust that everything will work out.  We are blessed that we are with family, and the location we are in is right off the highway with no less than 3 truck repair places less than a mile away.  Will keep you posted.

-Sean


www.herdofturtles.org
1984 Eagle Model 10S

[robertglines1]

ck oil;note color and level and post.

[Seangie]

Nix the engine not starting....I think I have a bad Skinner valve....nothing to do with the engine running.

Bob-  oil looks good.  There is a full mark and a needs more oil mark.  I'm assuming a gallon between the 2 marks.  We were at the full mark when we left, went about 1000 miles and we are still closer to the full mark (I'd guess 2 quarts short)  oil is black.  Just had an oil change about 1500 miles ago.  (This past spring)

-Sean


www.herdofturtles.org
1984 Eagle Model 10S

[HB of CJ]

Or...a wandering rocker arm?  Maybe a reach here.  HB of CJ (old coot)

[RickB]

Sounds like an exhaust manifold leak to me but the audio is nothing like being there


Rick

[robertglines1]

Like Rick said look for Black carbon exhaust tracks around exhaust. I blew one on 8V92TA couple years ago --dropped 300 rpm top end rite away. Would get it figured out for sure before it cost big$$$$.  Exhaust gasket's under $30

[luvrbus]

Only way you will find the problem is what is called the elimination process may take while a good nut turner will chase it down could be anything if is it not the compressor or blower then eliminate the valve train one cylinder at a time do you have Jakes ?