Crank Bearings? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HotRod73 · 01-10-2007, 01:11 AM

Is it possible to have bad crank bearings? i was looking at buying another truck but they told me it may needs the crank bearings changed out soon, what does this mean???

*Billla* · 01-10-2007, 02:06 AM

It means you should only buy the truck if you plan on rebuilding the engine

Seriously, anything can go bad...but I can't imagine how they know that's the problem...

HotRod73 · 01-10-2007, 02:27 AM

how do u tell if they are going bad? will it make any noises?

piecesparts · 01-10-2007, 10:43 AM

YEAH, instead of the growly, rumpety, whirring noise that you normally hear, it sounds like a grindy, chunk, chunk, clunkety clunk, skkkkrawwwwwky noise. It is a sound that you will never forget.

HotRod73 · 01-10-2007, 11:40 AM

oh well this truck runs good and it doesnt knock or anything like that or make any grinding noises.. so im guessing they are okay? he just said its a old motor and it may need new bearings soon and i need to keep oil in it...

edman87 · 01-10-2007, 04:05 PM

How is the oil pressure when it warms up? Low oil pressure could be the reason they think it has bad bearings, ...or it could be that they have no idea what they are talking about and someone told them that.

lurch115 · 01-10-2007, 09:25 PM

you'd know if the crank bearings needed to be replaced soon...

*Billla* · 01-10-2007, 10:18 PM

Quote:

Originally Posted by edman87

it could be that they have no idea what they are talking about and someone told them that.

That's my take :/ Basically, they're telling you that the engine isn't sound so that if you come back to them the day after buying the truck with a blown engine they can say "Hey, I told you so".

By the time you can hear a bearing clearance problem, the bearings are spun.

hiway · 01-10-2007, 10:56 PM

There basically telling you it needs a motor. Mains knock under light load.

HotRod73 · 01-10-2007, 11:25 PM

it doesnt make any knocking sound i reved it up etc and no noises except for a lose exhaust....

HotRod73 · 01-10-2007, 11:46 PM

what is low oil pressure for a sbc??

HotRod73 · 01-18-2007, 12:00 AM

well i think i know why they said that.... when u first start it up u can hear a knockish/rattlish sound only for a few seconds when u first start it and then goes away. i let it warm up and i never heard it come back... they say its probably exhaust hitting somethin or lose but could be bad bearings, what do yall think? they dont know anything really....

01-10-2007, 01:11 AM	#1
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Crank Bearings? Is it possible to have bad crank bearings? i was looking at buying another truck but they told me it may needs the crank bearings changed out soon, what does this mean??? __________________ 1973 Chevrolet C20 (Under Construction)

01-10-2007, 02:06 AM	#2
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,815	Re: Crank Bearings? It means you should only buy the truck if you plan on rebuilding the engine Seriously, anything can go bad...but I can't imagine how they know that's the problem...

01-10-2007, 02:27 AM	#3
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Crank Bearings? how do u tell if they are going bad? will it make any noises? __________________ 1973 Chevrolet C20 (Under Construction)

01-10-2007, 10:43 AM	#4
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Crank Bearings? YEAH, instead of the growly, rumpety, whirring noise that you normally hear, it sounds like a grindy, chunk, chunk, clunkety clunk, skkkkrawwwwwky noise. It is a sound that you will never forget.

01-10-2007, 11:40 AM	#5
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Crank Bearings? oh well this truck runs good and it doesnt knock or anything like that or make any grinding noises.. so im guessing they are okay? he just said its a old motor and it may need new bearings soon and i need to keep oil in it... __________________ 1973 Chevrolet C20 (Under Construction)

01-10-2007, 04:05 PM	#6
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	Re: Crank Bearings? How is the oil pressure when it warms up? Low oil pressure could be the reason they think it has bad bearings, ...or it could be that they have no idea what they are talking about and someone told them that. __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

01-10-2007, 09:25 PM	#7
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	Re: Crank Bearings? you'd know if the crank bearings needed to be replaced soon... __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L

01-10-2007, 10:56 PM	#9
hiway Mad Scientist Join Date: Jul 2005 Location: Enola Arkansas Posts: 380	Re: Crank Bearings? There basically telling you it needs a motor. Mains knock under light load. __________________ Everythang relates to Beer! 86 1/2ton on tons! sbc/465/208/D60/14/35's 81 Postal....with 468 bbc 97 Merc Marq comuter 07 Suburban 02 Danger Ranger

01-10-2007, 11:25 PM	#10
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Crank Bearings? it doesnt make any knocking sound i reved it up etc and no noises except for a lose exhaust.... __________________ 1973 Chevrolet C20 (Under Construction)

01-10-2007, 11:46 PM	#11
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Crank Bearings? what is low oil pressure for a sbc?? __________________ 1973 Chevrolet C20 (Under Construction)

01-18-2007, 12:00 AM	#12
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Crank Bearings? well i think i know why they said that.... when u first start it up u can hear a knockish/rattlish sound only for a few seconds when u first start it and then goes away. i let it warm up and i never heard it come back... they say its probably exhaust hitting somethin or lose but could be bad bearings, what do yall think? they dont know anything really.... __________________ 1973 Chevrolet C20 (Under Construction)



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