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Old 09-30-2005, 07:39 AM
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Ridge reamer?

I have come into some engine blocks which I am stripping down..there is a small ridge..carbon? at the top of the cylinders that make it a bit tough to get the pistons out..do I need to buy a ridge reamer or is there some tip to get that ridge out so the pistons slide out..??

OMT
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Old 09-30-2005, 09:21 AM
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If you don't cars about the rings, Just beatem out out. IF you may want to salvage something, scrap off the carbon with a pocket knife. IF you are intending an using the pistons and rings again and won't be over boring you might then need to worry about a ridge reamer.
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Old 09-30-2005, 10:26 AM
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If you are planning to use the pistons again, then you should use a ridge reamer. If you just drive them out, they could be damaged and not show (small cracks etc.) then fail later.

TRoy
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Old 09-30-2005, 10:39 AM
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It's true that you can simply drive the pistons out (as long as you don't intend to use them again) but you also take a chance on putting deep scratches in the cylinder walls when the rings break up while you're driving them out.

A Ridge Reamer is a pretty inexpensive tool to have around the shop. They're simple to use and if I were you I'd use one rather than simply beating the pistons out of their bore.
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Old 09-30-2005, 10:43 AM
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A ridge reamer is a pretty inexpensive tool to have around the shop. They're simple to use and if I were you I'd use one rather than simply beating the pistons out of their bore.[/QUOTE]
Very good advice!
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Old 09-30-2005, 11:10 AM
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Thanks guys..I picked up a pile of small block Ford stuff..engines and trannies and such and am cleaning it up and salvaging what I can out of the pile..what I do not use in my project I will swap meet out..

I will pick up a ridge reamer and use that..the block that I will use will go over to my machine shop guy for block prep as well as the heads..

thanks Again

OMT
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Old 09-30-2005, 11:30 AM
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The ridge in the cylinders must be fairly substantial to keep the piston from coming out with a moderate tap. If you have to really whack the piston and rod assembly hard, then the ridge is probably larger than you think it is. If it's that worn, you are probably going to have it bored to the next oversize anyway. If your intentions are to just re-ring it, then you might want to get out the ridge reamer and cut it out before disassembly.

Brian
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Old 10-01-2005, 06:48 PM
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Quote:
Originally Posted by NAIRB
The ridge in the cylinders must be fairly substantial to keep the piston from coming out with a moderate tap. If you have to really whack the piston and rod assembly hard, then the ridge is probably larger than you think it is. If it's that worn, you are probably going to have it bored to the next oversize anyway. If your intentions are to just re-ring it, then you might want to get out the ridge reamer and cut it out before disassembly.

Brian
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yes to all the ridge reamer stuff.

But be careful with it.

I have seen more than one block that was ruined by cutting too much out with a ridge reamer. .060 over would not clean up the ridge reamer cut even on a worn standard bore block. If your block is already .030 over and there is .020 wear (.010 on each side) you only have .005 to play with on each side so you have a 95 % chance of ruining that block. Let the machine shop cut out the ridge..
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Old 10-02-2005, 10:00 AM
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I Would Use It If You Want It To Run.
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Old 10-02-2005, 10:07 AM
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Well it only takes one or two turns on the reamer to get enough of the ridge out to get the pistons to come out..and the block goes over to the shop for dunking and magnaflux to see if it is usable..

Always is a bit of a risk on using old blocks..but that is just the way life goes..

OMT
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