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#1 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Help, Loud engine noise!
Alright, I have a 1985 gmc 4x4 305/7004/208np. I now have a noise that ive spent 2 weeks trying to find and can NOT find it for the life of me. So first i thought it was my alternator bearing so i just bought a 140 amp alternator, put it in and noise is still there. Its a hard noise to describe, almost like a loud chatter,chirping but realllllllly loud when pulling a hill. makes the noise 75% of the time now. only time it doesn't is when traveling on dead flat road and or down hill.I had taken the alternator belt off to see if it was those 3 pullys, still there. Messed with the power steering and doesn't see, to be that either. I'm completely stumped, Ive listen to so many videos an cant really see to find it. Please help. Oh and the belts are newer too.
- Jake
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#2 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Help, Loud engine noise!
Take a look at your engine's flexplate. It sounds like it is cracked. I had this happen on a couple of trucks, so I replaced the flexplate with a heavy duty plate and solved the issue. The noise comes from the torque converter ballooning out when you spin it up to speed. The convertor will spread axially and cause the flexplate to crack.
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#3 |
Registered User
Join Date: Oct 2013
Location: Winfield KS
Posts: 489
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Re: Help, Loud engine noise!
Definitely sounds like something tied to your drive train if the noise gets worse when the motor is under a load.
I chased a noise under the hood once. I replaced everything and it was still there. It ended up figuring out that it was the fan clutch. You might check that. They will wobble and chatter when they start to go bad. Grab your fan and see if the fan & shaft wobble any when trying to move it up and down. |
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#4 |
Registered User
Join Date: Dec 2011
Location: Arlington WA
Posts: 1,728
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Re: Help, Loud engine noise!
can you hear it through the exhaust. you can also use a tube to listen at different parts
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GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread |
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#5 | |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Quote:
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1985 ![]() |
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#6 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
I can not, but I'll have to use the tube in the future!!!!
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#7 |
Registered User
Join Date: Oct 2013
Location: Winfield KS
Posts: 489
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Re: Help, Loud engine noise!
If you sprayed the belts and the noise no longer existed then I would say it has to do with your belts. They can make a racket if worn or not inline with the pulleys correctly. Have you tried tightening your power steering belt? Are you sure its the correct one?
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#8 | |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Quote:
Just checked the fan and there is a lil amount of play in it, but to be completely honest the belts a the correct size, so id say yes there correct one, but the power steering side v belts seems 3x's more rigid than the alternator side v belt, and yes I have a few times now, I have the Power Steering belt pretty much as tight as I could get it. bout a 1/2 inch of play up and down. If I let it be any less, the belt squeals like a pig with the slightest turn. Now as for the pulley alignment, I dont know how to Correctly check that, by eye it looks good and straight.
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1985 ![]() Last edited by SnowNeck; 03-22-2014 at 08:33 PM. |
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#9 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
After taking a second look at it, when I grab the fan clutch to see if it has any play. I noticed when it moves, it's also moving the water pump pulley... what does that mean? Anyone?
-Jake
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#10 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,357
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Re: Help, Loud engine noise!
It means you probably found your noise. My truck was making some noises from the front last fall and when I grabbed the fan the water pump pulley was moving. Easy fix.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#11 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
What would you say I have to replace then? New fan and pulley?
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#12 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: Help, Loud engine noise!
Sounds like a water pump. Tighten the bolt on the fan and pulley and if they are tight and the pulley still moves it's the pump bearing.
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#13 | |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Quote:
Thanks for all the help guys! ![]() -Jake
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1985 ![]() |
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#14 | |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Quote:
Anyone any suggestions?????? thanks again, Jake
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1985 ![]() |
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#15 |
Registered User
Join Date: Feb 2011
Location: Cold Canada
Posts: 310
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Re: Help, Loud engine noise!
maybe a video of the noise would help
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#16 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
I would if my phone wasn't also all broke
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#17 |
Registered User
Join Date: Jan 2013
Location: Jasper, IN
Posts: 948
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Re: Help, Loud engine noise!
My power steering pump SQUEALS like a pig when i really get to turnin. I'm redoing all my steering this summer as my new 11" lift has taken it's toll already... Ram assist here i come!
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When in doubt, throttle it out! 1974 Chevrolet Custom K20 2005 Ford Ranger Edge 1985 Chevrolet Custom Deluxe C10 |
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#18 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: Help, Loud engine noise!
If belt dressing helps then it is in your belt system. Maybe you have the wrong pulley configuration. Or one is out of alignment. Saw a bent steering pump bracket do this to a guy for years til he figured it out when he switched out the engine.
Although the symptoms sound a bit like the tranny. Why would it make the sound when pulling on a hill?
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#19 |
Registered User
Join Date: Oct 2013
Location: Winfield KS
Posts: 489
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Re: Help, Loud engine noise!
Have you tried the belt dressing several times and everytime the noise stops? To me it definitely sounds drive train related. I'm thinking tranny now. Maybe your timing chain has got slack in it? Are either of your motor mounts broke? If so your motor could be pulling up on one side when under a load. The motor mount might be rattling when lifted a little (just a thought).
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#20 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
After looking at the truck all day and romping it around at school found out that the noise is coming from the transfer case. I thought it was the belts because it made less noise when the engine was cold so as it warmed up I thought it was the belt conditioner wearing off when really it was just getting warm. But, I'm not at a loss guess I should starting looking for a new 208 transfer case
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#21 |
Registered User
Join Date: Feb 2011
Location: Cold Canada
Posts: 310
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Re: Help, Loud engine noise!
probably not, but does it still has the cathalyc converter? if its from the tc by the sound it makes put your figer in the oil to see if its silver
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#22 |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Cats are long gone, but right in the oil drain plug?
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#23 |
Registered User
Join Date: Feb 2011
Location: Cold Canada
Posts: 310
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Re: Help, Loud engine noise!
take the fill plug out on the tc and put your small finger in and look at the oil if there is still some left, if it sounds like loose shrapnel rolling in there maybe youll see it in the oil color. also put the tc in neutral and shift all the transmission gears maybe youll hear it
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#24 | |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Quote:
Thanks again. -Jake
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#25 | |
Registered User
Join Date: May 2012
Location: Pennsylvania
Posts: 132
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Re: Help, Loud engine noise!
Quote:
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305, bearing, chirping, transfer case, transmission |
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