I'm gonna remove the conrods and pistons tomorrow and I was wondering if it was necessary to ream the unused upper portion of the cylinder bore in order to remove the pistons.

If I'm not mistaken, the precaution of reaming the edges is to prevent the piston rings from being damaged upon removal. Is this correct?

Of course you can't pull the piston out from the bottom b/c the main bearing castings get in the way.

I won't be reusing the old P72-A0's. Instead I'll be using P73-00's with new rings.

So, how necessary is the procedure?

 

I didn't have to. It depends on the mileage of the motor. 180k miles and I didn't

 

do it!
that way when you hone your walls it wont F it up

 

DONT DO IT. A ridge reamer is a very easy way to trash you block if you mess up. I have never seen the neccesity for one on a Honda. Its used in primitve pushrod engines, that have carbs, and 4 wires total for the engine. The run like **** and have carbon build up. It can catch a ring and bring some of the cylinder wall with it. In that case use it. The ridge in your engine does not need to be reamed.

 

I have not came across a B-series Honda bore that needed to be reamed in order to remove the piston.

Who cares if you damage the piston rings taking them out? If you are taking the pistons out in almost all cases you are not going to use them again.

-kenji

 

yea, mine came out no problem. no ridge on my cylinders at 76K.

 

Thanks everybody for confirming and clearing that up.

 

My D16Y8 had 64K miles on it, and I had the ridge reamer sitting there in case I needed it... but the pistons came out just dandy! No ridge found, they just popped out.

 

Stock Honda sleeves are to hard to have a ridge at the top...

 

I popped mine out pretty easily yesterday. #'s 1 and 2 needed a little tap out and that was it.

Thanks again.

 

 

damn i must be an old hot rodder because well i read that it was always a necesisty in an old hot rodding mag a long time ago well...
learned something new

later

 

yea, I looked at mine after like 40K and the sleeves were slightly glazed
but the ridge..? what ridge I kept my headgasket inner layer as a
dressup kit for my coffee table and there is almost no carbon on it
at all.

 

it IS a nesscity on old hotrods that carbon up bad (carbed)

 

run your fingernail up the cylinder like you are going to scratch an itch. If your fingernail catches at the top ream it, it it doesn't don't bother. A ridge will catch your fingernail. Just like it would the rings. You may not have to do anything. The ridge is cause by the point where cylinder wear stops at the highest point. ANd that is were the carbon build up would be.


[Modified by virginia_dude, 9:10 AM 7/26/2002]

 

I caught a little lip with my finger and still just pushed the pistons out.

Two days ago.

 

Well your ridge was minimal then, thats what catchs the rings in the way out. and can damage piston skirts. Point was you don't automaticaly have to use a ridge reamer. but thats an easy way of telling if you have one and how bad it is.

 

That and I didn't care about the pistons........forged goodies....