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Old 01-14-2011, 12:16 AM   #1
rollin thunder
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help with diagnosing a knock in my engine

I have a 1984 Chevrolet 1/2 ton c 10 with a 250cu straight six.This is an amazing find i got it for only a $100 and for the shape its crazy i have only read about these finds but the only thing i noticed wrong with it is it has a knock in the engine. It sounds like it is coming from deep like almost the bottom of the block. I thought it might be a wrist pin and i tried pulling spark plugs caps on each cylinder at a time and that had no effect on the knock. Any suggestions? or maybe it is a wrist pin and isn't the piston still moving so maybe the knock would continue? makes sense i guess i am still learning so any advice would be great

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Old 01-14-2011, 01:00 AM   #2
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Re: help with diagnosing a knock in my engine

do you have oil presure?
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Old 01-15-2011, 12:51 AM   #3
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Re: help with diagnosing a knock in my engine

yeah I have oil pressure
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Old 02-13-2011, 07:16 PM   #4
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Re: help with diagnosing a knock in my engine

[IMG]100000046668860&aid=28782#!/photo.php?fbid=150207834990771&set=a.150203861657835.28782.100000046668860&theater[/IMG]

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Old 02-13-2011, 08:38 PM   #5
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Re: help with diagnosing a knock in my engine

we had a 250 with bad piston slap sounded like a deisel motor. ran a lot of miles like that.
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Old 02-13-2011, 10:54 PM   #6
ETsC10
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Re: help with diagnosing a knock in my engine

Flexplate?
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Old 02-16-2011, 07:21 PM   #7
rollin thunder
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Re: help with diagnosing a knock in my engine

as far as it being a flexplate i forgot to mention (manual, 3 speed on column) i just recently replaced the entire clutch assembly flywheel included i figured since i was taking the transmission down i might as well check everything else out and replace it. but i am going to pull the motor and have it completely rebuilt at a performance shop locally so i can wait till then to find out what it is exactly and if it is just a piston slap which i got more information from some of the shops and they all agree its probably that then im good to drive it till i pull the motor i assume. Can not wait till the truck is finished i have a lot of plans for it i will try and get some pics on this thread soon of then and now

Last edited by rollin thunder; 02-16-2011 at 07:25 PM.
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Old 02-17-2011, 04:06 PM   #8
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Re: help with diagnosing a knock in my engine

the day we brought it home

[IMG][/IMG]






the same day after we washed and waxed and replaced all fluids

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Old 02-17-2011, 04:10 PM   #9
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Re: help with diagnosing a knock in my engine

[IMG][/IMG]

About a month later here... and i`m gonna go take pics of it today here in a little bit
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