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#1 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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Big Knock in enigine Bottom end?????
My buddies truck just broke down!! He is in the dark ages so I thought I'd ask the pro's for him! Just wondering if any one has any idea what the problem could be????? The moter blew a gasket and spit the oil out on the highway. The motor still runs fine, but makes a loud Knock Knock Knock Knock !!!!!!!Knock!!!
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1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
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#2 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,855
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sounds like he spun a main bearing and it's worn into the crank. This causes the connecting rod to knock against the crank since it's loose now.
Just my guess
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#3 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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i had a connecting rod "wrist pin" go bad,,,my knocking noise on deceleration,and idle only,,like you said the motor ran fine,,no noise under load
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#4 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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It knocks at idle and when you drive it! We drove it home about 15miles and nothing changed same knock while it's running!
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1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
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#5 |
CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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It won't be long before he finds the problem...it will be sticking out of the side of the block
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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#6 |
Registered User
Join Date: Dec 2002
Location: Canada
Posts: 695
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Either look for another engine or tear it down now. If you keep running it - it won't be for long.
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1968 Chevy - 292 with a powerglide |
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#7 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Stick a fork in it it's done! All he's doing now is circulationg bearing material throughout the block. Park and rebuild!
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#8 |
KEEP ON TRUCKING
Join Date: Sep 2000
Location: martinsville va
Posts: 2,563
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time for a rebuild a rod thru the block is not a nice pic
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72 cheyenne 2wd lwb 71 k20 sons bassett va |
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#9 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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Thanks guys!
He just called and he took the oil pan off to see if it is a 4 Bolt Main so he doesn't get ripped off! I told him to rebuild it himself but he is worri!! Time for a rebuild Book!LOL Cheers ![]() ![]() ![]() ![]()
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1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
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#10 |
Registered User
Join Date: Mar 2003
Location: Stillwater MN
Posts: 1,166
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It will need a crank for sure, and if it is a main that spun, the block will be toast as well. I wouldn't get my hopes up until I determined the source. It may need to be completely replaced....HHHmmm good time for a ZZ4???!
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69 GMC K10 ..some restoration required....still.. ![]() |
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