The King of weird noises does it again.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gray Ghost · 12-12-2007, 12:56 PM

My truck holds the record in our club as being the one that has the strangest noises. Today a new one cropped up and I wanted to see if any of you guys had ever heard this one.

I accelerated up to 65 on the way to the bank in Forney today when I got on the highway. After reaching 65 I let off a bit to hit cruising speed and this weird valvetrain sounding noise started clattering. It sounds almost like revving a motor up with very little oil in it. At first it was only doing this at speed and not making a sound if I either let off the gas or accelerated more. Now I am beginning to hear it a bit at part throttle acceleration. Oil has been checked [I added Lucas to it last week cause my upper rings are loose and I thought it would minimize the blow-by]. The oil level is fine and it's been say 6000 miles since the last change.

I looked for something that might be vibrating but found nothing loose under the hood. As the noise progresses, I am pretty sure it's in the valvetrain, but it doesn't do it at idle or when the pedal is to the metal.

Anyone heard of this? The motor has bever been rebuilt and has at least 149k on it. I talked to a couple of friends that say I have the strangest noises and that most of them they've never heard before....lucky me huh?

69GMCor70Chevy · 12-12-2007, 01:11 PM

Same thing happened to me. It was the pinion bearing in the rear end. For me it sounded like the noise was at the back of the cab about where the tranny is. Jack it up and listen to the rear end while someone revs it up. Remember safety first.

BigDaddyDave · 12-12-2007, 01:14 PM

Drive it till it wont drive no more,thats how i diagnose all my problems.hehe

Shyguy · 12-12-2007, 04:24 PM

Is it possible it could be a timing problem?

It kind of sounds like it could be the clatter when there is a problem with the mechanical or vacuum advance.

Danny

Jtrux · 12-12-2007, 04:47 PM

Lifter failure possibly???

ChevLoRay · 12-12-2007, 05:00 PM

Quote:

Originally Posted by BigDaddyDave

Drive it till it wont drive no more,thats how i diagnose all my problems.hehe

If it ain't broke, I can't fix it....or, fix it 'til it breaks.

60ratrod · 12-12-2007, 05:42 PM

well i think that it's about time that you change that oil there. i change mine every 3k(give or take a few hundred miles). you may just have to go in and just adjust your rocker arms. its a simple enough thing to do. a stethoscope is a mechanic's best friend. if you don't got one, a screwdriver works almost as good.

Gray Ghost · 12-12-2007, 06:17 PM

I just installed a new distributor the day before. It's an Accel Billet. I can check the vacuum advance tomorrow and see if it is working.

I know a ton of folks who change their oil at 3k, I usually change mine every 5k, I know I am a little late on that, but I can't imagine that causing the problem when the factory recommended 6500-7500 miles between changes.

Lifter failure....that may be the case, I just don't know.

The sound is definitely coming from the front of the truck so I doubt it's the rear axle.

**Boog** · 12-12-2007, 08:36 PM

Kelly with that many miles on it the timing chain can be real loose allowing the chain to flop around and maybe slap the timing cover, the valve lash might need to be adjusted or just an oil change as it starts getting pretty thin with that many miles on the oil. I think I'd start with an oil and filter change to a heavier weight oil like say a 20w50 and see how it sounds. Have you tested the oil pressure to see just what it has?
Just reread your post. Did it make this noise BEFORE you changed the dist?

Gray Ghost · 12-12-2007, 09:15 PM

No it didn't, it's a brand new noise. I am going to change the oil in the morning and see if that helps.

I checked the timing chain 5 months ago when I replaced the timing cover and it was only moving about 1/8".

Gray Ghost · 12-13-2007, 07:02 AM

Well the verdict is in...lifter failure on number 5 cylinder. I thought it was an exhaust leak and the ticking was just getting louder, but the headers are not the cause. The motor has never been rebuilt from what we could tell last year when we pulled the pan and the intake so I guess it's time to replace it.

Since this is my daily driver I'll be getting a stock motor with an RV cam for towing from a local rebuilder so that I can get back on the road soon.

The 350 in the truck now will get stripped down and inspected for possible use later in the stepper as a 400-425 hp 383.... :evil:

**Boog** · 12-13-2007, 05:03 PM

Ah, a man with a plan! Now you can put all those foul noises to rest....

**clay68c10** · 12-13-2007, 06:44 PM

Then you can make the squealing tires noise!

Gray Ghost · 12-14-2007, 03:23 AM

You bet!....might even go with a little hotter cam in the this motor just for fun factor whilst hauling deck lumber...

12-12-2007, 12:56 PM	#1
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	The King of weird noises does it again.... My truck holds the record in our club as being the one that has the strangest noises. Today a new one cropped up and I wanted to see if any of you guys had ever heard this one. I accelerated up to 65 on the way to the bank in Forney today when I got on the highway. After reaching 65 I let off a bit to hit cruising speed and this weird valvetrain sounding noise started clattering. It sounds almost like revving a motor up with very little oil in it. At first it was only doing this at speed and not making a sound if I either let off the gas or accelerated more. Now I am beginning to hear it a bit at part throttle acceleration. Oil has been checked [I added Lucas to it last week cause my upper rings are loose and I thought it would minimize the blow-by]. The oil level is fine and it's been say 6000 miles since the last change. I looked for something that might be vibrating but found nothing loose under the hood. As the noise progresses, I am pretty sure it's in the valvetrain, but it doesn't do it at idle or when the pedal is to the metal. Anyone heard of this? The motor has bever been rebuilt and has at least 149k on it. I talked to a couple of friends that say I have the strangest noises and that most of them they've never heard before....lucky me huh? __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. Last edited by Gray Ghost; 12-13-2007 at 01:45 AM.

12-12-2007, 01:11 PM	#2
69GMCor70Chevy Registered User Join Date: Jul 2007 Location: Greenwater Lake, SK Posts: 175	Re: The King of weird noises does it again.... Same thing happened to me. It was the pinion bearing in the rear end. For me it sounded like the noise was at the back of the cab about where the tranny is. Jack it up and listen to the rear end while someone revs it up. Remember safety first. __________________ 68 Camaro - 327 Original Red on Red Car 69 GMC LWB - Built 350 a Blast To Drive 69 GMC LWB - "Green Machine" One Family Truck 70 Mercury Marauder - Future Project Last edited by 69GMCor70Chevy; 12-12-2007 at 01:12 PM.

12-12-2007, 01:14 PM	#3
BigDaddyDave RIP BigDaddyDave ~7-23-09~ You will be missed~ Join Date: Aug 2007 Location: Concord NC Posts: 1,361	Re: The King of weird noises does it again.... Drive it till it wont drive no more,thats how i diagnose all my problems.hehe __________________ BigDaddyDave's Truck: http://www.flickr.com/photos/daves71chevy/ \| See it in Action!

12-12-2007, 04:24 PM	#4
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: The King of weird noises does it again.... Is it possible it could be a timing problem? It kind of sounds like it could be the clatter when there is a problem with the mechanical or vacuum advance. Danny

12-12-2007, 04:47 PM	#5
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: The King of weird noises does it again.... Lifter failure possibly??? __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

12-12-2007, 05:42 PM	#7
60ratrod yes, i do Join Date: Jun 2007 Location: Spokane, wa Posts: 2,734	Re: The King of weird noises does it again.... well i think that it's about time that you change that oil there. i change mine every 3k(give or take a few hundred miles). you may just have to go in and just adjust your rocker arms. its a simple enough thing to do. a stethoscope is a mechanic's best friend. if you don't got one, a screwdriver works almost as good. __________________ ERROR 404....... SNAPPY COMEBACK NOT FOUND _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900

12-12-2007, 06:17 PM	#8
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: The King of weird noises does it again.... I just installed a new distributor the day before. It's an Accel Billet. I can check the vacuum advance tomorrow and see if it is working. I know a ton of folks who change their oil at 3k, I usually change mine every 5k, I know I am a little late on that, but I can't imagine that causing the problem when the factory recommended 6500-7500 miles between changes. Lifter failure....that may be the case, I just don't know. The sound is definitely coming from the front of the truck so I doubt it's the rear axle. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. Last edited by Gray Ghost; 12-12-2007 at 06:20 PM.

12-12-2007, 08:36 PM	#9
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,141	Re: The King of weird noises does it again.... Kelly with that many miles on it the timing chain can be real loose allowing the chain to flop around and maybe slap the timing cover, the valve lash might need to be adjusted or just an oil change as it starts getting pretty thin with that many miles on the oil. I think I'd start with an oil and filter change to a heavier weight oil like say a 20w50 and see how it sounds. Have you tested the oil pressure to see just what it has? Just reread your post. Did it make this noise BEFORE you changed the dist? __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross Last edited by Boog; 12-12-2007 at 08:38 PM.

12-12-2007, 09:15 PM	#10
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: The King of weird noises does it again.... No it didn't, it's a brand new noise. I am going to change the oil in the morning and see if that helps. I checked the timing chain 5 months ago when I replaced the timing cover and it was only moving about 1/8". __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

12-13-2007, 07:02 AM	#11
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: The King of weird noises does it again.... Well the verdict is in...lifter failure on number 5 cylinder. I thought it was an exhaust leak and the ticking was just getting louder, but the headers are not the cause. The motor has never been rebuilt from what we could tell last year when we pulled the pan and the intake so I guess it's time to replace it. Since this is my daily driver I'll be getting a stock motor with an RV cam for towing from a local rebuilder so that I can get back on the road soon. The 350 in the truck now will get stripped down and inspected for possible use later in the stepper as a 400-425 hp 383.... :evil: __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. Last edited by Gray Ghost; 12-13-2007 at 12:43 PM.

12-13-2007, 05:03 PM	#12
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,141	Re: The King of weird noises does it again.... Ah, a man with a plan! Now you can put all those foul noises to rest.... __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

12-13-2007, 06:44 PM	#13
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,935	Re: The King of weird noises does it again.... Then you can make the squealing tires noise! __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

12-14-2007, 03:23 AM	#14
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: The King of weird noises does it again.... You bet!....might even go with a little hotter cam in the this motor just for fun factor whilst hauling deck lumber... __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.



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