underhood noise alt or power steering pump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nrb's70gmc · 01-31-2010, 07:10 PM

ok quick question once again
im trying to find a noise under my hood i have got it down to the either the alt, or power steering pump pully.

it is a constiant noise and that is what it sounds like (bad bearing- i think) when i rev the motor up i cant tell if it gets louder because of engine noise, but win at idle it is constaint.

it does not sound like a rattle but more of like a squeel (dont know really how to explain it)

i can hear it in side the cab at idle and parking lot driving.

as far as parts i bought the alt in 2005-06 its a powermater 140amp and the power streeing pump was on there when i bought the truck. i have always kept proper fuild level in it.

anyone else heard this noise before? or have any advise?

**BAD4X4** · 01-31-2010, 07:20 PM

Stick a long screwdriver to your ear and then down to the ps pump or alt and should be able to tell which one it is. Hope this helps.

Longhorn Man · 01-31-2010, 07:26 PM

or loosen/remove a belt and fire it up. if the noise is gone, then the pully that is no longer spinning is the bad one.

nrb's70gmc · 01-31-2010, 07:38 PM

i did do the screwdriver sound test the alt did not sound bad the pump did not sound all theat bad either im going to go pull a belt and see

gkesseru · 01-31-2010, 07:42 PM

I once had a similar noise that I couldn't find. An older mechanic told me that antifreeze on a belt can make a ticking sound. Sure enough, a new belt cleared up the problem.

nrb's70gmc · 01-31-2010, 07:50 PM

ok i just found out that its the power steering pump so, what next? can the noise be a bad belt? or is it a pully problem? thanks mr.longhorn man

junkyardjohn · 01-31-2010, 08:00 PM

I've got a pete jackson gear drive timming set (the noisy one) in my daily driver, & have had several complete strangers (always helpful & sincere) tell me at a light or in a parking lot........ Hey buddy.... Sounds like your p.s. Pump or alternator has a bearing going. I love that whine. I've had water pumps make noise too, but if you grab the fan & try to wiggle it, you can usually tell if theres any slop in the bearing.

john

nrb's70gmc · 01-31-2010, 08:05 PM

ok im confused, i put the belt back on and started it, no noise / maybe a loose belt?

nrb's70gmc · 01-31-2010, 08:07 PM

gear drives sound cool worn out parts sound like a POS

**Stocker** · 01-31-2010, 08:30 PM

Quote:

Originally Posted by nrb's70gmc

ok im confused, i put the belt back on and started it, no noise / maybe a loose belt?

Maybe so, but if the noise comes back, try a new belt.

John! Good to see you posting again, I thought maybe you fell off the face of the earth after you left Nevada!!

Longhorn Man · 01-31-2010, 10:30 PM

No doubt man, I thought you were gone too man. March of 07 till jan of 10... good little break there.

01-31-2010, 07:10 PM	#1
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	underhood noise alt or power steering pump? ok quick question once again im trying to find a noise under my hood i have got it down to the either the alt, or power steering pump pully. it is a constiant noise and that is what it sounds like (bad bearing- i think) when i rev the motor up i cant tell if it gets louder because of engine noise, but win at idle it is constaint. it does not sound like a rattle but more of like a squeel (dont know really how to explain it) i can hear it in side the cab at idle and parking lot driving. as far as parts i bought the alt in 2005-06 its a powermater 140amp and the power streeing pump was on there when i bought the truck. i have always kept proper fuild level in it. anyone else heard this noise before? or have any advise? __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

01-31-2010, 07:20 PM	#2
BAD4X4 Senior Member Join Date: Jan 2003 Location: La pine Oregon Posts: 1,668	Re: underhood noise alt or power steering pump? Stick a long screwdriver to your ear and then down to the ps pump or alt and should be able to tell which one it is. Hope this helps. __________________ 1972 Cheyenne K-30 6"lift {502 PROJECT} 1972 Cheyenne K-30 8"lift 454 450hp {Ol'Blue} 1972 Cheyenne K-20 Custom Stretch 6" lift 454 1972 Custom Deluxe K-20 4" lift 2007 GMC Crew Cab Diesel 6"lift {The Tow Rig 2017 Ford F-350 Crew Cab 6.7 6"lift (Wife's) 1977 El Camino SS Grandpa baught new 1986 K-30 Crew Cab 502 1955 Chevy 2-Door gasser 454 550hp{project} 1956 Chevy Bel-Air 2-Door hardtop 572 700hp 1979 Ford F-350 All Original 4x4 (Wife's)

01-31-2010, 07:26 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: underhood noise alt or power steering pump? or loosen/remove a belt and fire it up. if the noise is gone, then the pully that is no longer spinning is the bad one.

01-31-2010, 07:38 PM	#4
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	Re: underhood noise alt or power steering pump? i did do the screwdriver sound test the alt did not sound bad the pump did not sound all theat bad either im going to go pull a belt and see __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

01-31-2010, 07:42 PM	#5
gkesseru Registered User Join Date: Dec 2009 Location: California, Maryland Posts: 544	Re: underhood noise alt or power steering pump? I once had a similar noise that I couldn't find. An older mechanic told me that antifreeze on a belt can make a ticking sound. Sure enough, a new belt cleared up the problem. __________________ 72 Fleet (died) 78 Step (sold) 55 Step named Fred (sold) 00 F150 68 Step (named El Scorcho by PO) Build thread for the new El Scorcho http://67-72chevytrucks.com/vboard/s...d.php?t=392932

01-31-2010, 07:50 PM	#6
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	Re: underhood noise alt or power steering pump? ok i just found out that its the power steering pump so, what next? can the noise be a bad belt? or is it a pully problem? thanks mr.longhorn man __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

01-31-2010, 08:00 PM	#7
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,425	Re: underhood noise alt or power steering pump? I've got a pete jackson gear drive timming set (the noisy one) in my daily driver, & have had several complete strangers (always helpful & sincere) tell me at a light or in a parking lot........ Hey buddy.... Sounds like your p.s. Pump or alternator has a bearing going. I love that whine. I've had water pumps make noise too, but if you grab the fan & try to wiggle it, you can usually tell if theres any slop in the bearing. john __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

01-31-2010, 08:05 PM	#8
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	Re: underhood noise alt or power steering pump? ok im confused, i put the belt back on and started it, no noise / maybe a loose belt? __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

01-31-2010, 08:07 PM	#9
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	Re: underhood noise alt or power steering pump? gear drives sound cool worn out parts sound like a POS __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

01-31-2010, 10:30 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: underhood noise alt or power steering pump? No doubt man, I thought you were gone too man. March of 07 till jan of 10... good little break there.



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