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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 74stepside on June 28, 2006, 09:15:00 pm

Title: ridge reaming cylinders???
Post by: 74stepside on June 28, 2006, 09:15:00 pm

is it always necessary to ream the top of the cylinders prior to pistion removal?? im bringing my block to the machine shop to have it rebuilt and my buddy said he'd help me take the crank and pistons out i just wasnt sure   if reaming was a must...this is my first time taking a motor apart and i just wanted to make sure i did it right..

Title: Re: ridge reaming cylinders???
Post by: 1976Scottsdale on June 28, 2006, 09:02:00 pm

I have never reamed cylinders before removing the pistons myself.  That is just me though.  I would think it would be hard to do the reaming with the pistons still in.

Title: Re: ridge reaming cylinders???
Post by: VileZambonie on June 28, 2006, 10:05:00 pm

If there is a severe ridge yes ream it. If not don't bother.

Title: Re: ridge reaming cylinders???
Post by: Z28 c10 on June 29, 2006, 07:36:00 pm

If your pulling the crank and all with the block on a stand, why don't you just push em through the bottom of the cylinders?? Might be a dumb question, but who knows??

 JayTater

 Z28 C10

Title: Re: ridge reaming cylinders???
Post by: Lt.Del on June 30, 2006, 01:07:00 am

Jay is right.  push those bad boys down throught the bottom.  I have honed the bores to get rid of the top lip of the bores after the pistons have been removed.

If you are getting the block bored .30 over or .40 over of whatever, you dont' need to hone it.

SgtDel
aka "Andy"

www.delbridge.net

1979 Big 10 383 stroker
1991 Blu 'Burb 3/4 ton 4x4

Title: Re: ridge reaming cylinders???
Post by: 74stepside on June 30, 2006, 06:11:00 pm

alright thanks for the info..im new at this i wasnt sure if the pistons could be removed from the bottom or not... i am getting a hone done anyway so that should take care of the ridge...i just bought a engine kit from a company called fast engine parts ..prices are pretty good heres the link if anyones interested....

www.fastengineparts.com/p...php?id=269

Title: Re: Re: ridge reaming cylinders???
Post by: 123 pugsy on June 30, 2006, 06:29:00 pm

Cover the connecting rod studs with pcs. of plastic hose or fuel line before lifting out the crank to avoid scratching the crank journals.

Title: Re: Re: ridge reaming cylinders???
Post by: Z28 c10 on June 30, 2006, 07:32:00 pm

if your re-using the old crank, you can do an old hillbilly trick to see what kind of shape the journals are in. chances are you may have to get er turned or polished but check this anyways. Take an old penny and rub it across the bearing surfaces, small particles of copper will be left in the deep scratches. Don't worry about damaging the crank with the penny neither, coppers too soft to damage the steel or iron, whichever one you have.

 JayTater

 Z28 C10

Title: reaming
Post by: Mr Diesel on July 01, 2006, 04:04:00 pm

If the rings have worn the cylinder significantly you may have to ream the top ridge in order to get the piston out. If there is much of a ridge the the rings will catch when you try to remove them.  

- Mr Diesel
'76 C30 Crew 6.2

Edited by: Mr Diesel at: 7/1/06 3:19 pm

Title: Re: reaming
Post by: 1976Scottsdale on July 03, 2006, 06:23:00 pm

If the rings catch, the bottom of a Blue Point ball pien hammer works well to knock the pistons out... also works on siezed pistons.

Title: Re: reaming
Post by: roundedline on July 05, 2006, 05:04:00 pm

you cannot remove all the pistons from the crank side of the block...  If I remember correctly Only #1 and #8 can be removed this way...

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project