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Piston Removal Problems

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Jon

08-11-2002 05:02:09




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I removed the head and oil pan on my WD-45 today and disconnected one of the connecting rods so I could push the piston out the top in preparation for a ring job. When I tried to do that, the piston would travel freely upward and then stop dead cold, halted at the what I assume is the ridge. What is my next step? The head on this tractor was overhauled maybe 200 hours ago max, but I didn't have the money to pay someone to do the ringjob at that time( now that I know better, it was a really shortsighted mistake. I should have found the money ). The compression leakage just got worse and worse past the rings, once the head and valves were tight,and plug fouling has made it unusable. So anyway I'm trying to fix the rest myself and ran into this piston removal problem. What now? Do I need to use a ridge removal tool and can I do it in the minimal barn shop that i have? I really didn't want to change sleeves; I was hoping to reuse these, or are they to worn? Feeling with my finger, it is a pretty distinct ridge.

Thanks in advance,

Jon

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Jon

08-12-2002 05:34:56




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 Re: Piston Removal Problems in reply to Jon, 08-11-2002 05:02:09  
Thank you gentlemen for your input and insight. It sounds very do-able by this novice rebuilder and I will keep you posted how it is going. I picked up a ridge reamer today from Autozone, which lends them for free with a deposit.

Thanks again,

Jon



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Jim in N.S.

08-11-2002 16:24:48




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 Re: Piston Removal Problems in reply to Jon, 08-11-2002 05:02:09  
Regardless of whether or not you need new sleeves, you should never try to force the pistons out without removing the ridge.If you do you will likely break the land's on the piston's.



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Mr.Dennis

08-12-2002 08:06:46




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 Re: Re: Piston Removal Problems in reply to Jim in N.S., 08-11-2002 16:24:48  
If you are replacing the sleeves why do you care what the old piston to be discarded looks like? Youare going to get new piston with the sleeve. I have used piston to drice out sleeve from block. I agree they looke rough but why should i care when i could save a bit of time by not saving a piston which had already worn out a sleeve? For light work old sleeves and pistons mat last another set of rings.

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Jon

08-13-2002 19:13:18




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 Re: Re: Re: Piston Removal Problems in reply to Mr.Dennis, 08-12-2002 08:06:46  
I'd like to just replace the rings if possible, but if the wear is too great, I will replace the sleeves. This tractor probably won't do much more than push some snow around and do some mowing., so I guess that qualifies as light work. The cylinder reamer I got from Autozone was defective, but O'Riellys auto parts also has loaners they lend for only a deposit, and it works quite well. I did 2 cylinders tonight after work and am real pleased, but I haven't tried to push the pistons out yet.

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Jim in UK

08-11-2002 06:38:41




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 Re: Piston Removal Problems in reply to Jon, 08-11-2002 05:02:09  
Sorry, but I am not real familiar with the A/C tractors. Although I have had to remove a few pistons from various different makes and models of tractors, cars, pickups, etc. What you will need to do is use a Ridge Reamer on the cylinders. It sounds like you have ALOT of wear on that engine if you are unable to push the pistons out with a wooden bock and hammer. The ridge reamer is not hard to use, and you should be able to purchase one from your NAPA Auto Parts Store, SEARS, most of your Tool Dealers (Mac, Snap-On etc.)

Put the connecting rod cap back on the connecting rod and run the piston up to top dead center. Then set the ridge reamer into the cylinder and adjust the cutting edge. You should be able to operate the tool with a 3/8" ratchet and socket. You may have to re adjust the cutting edge a few times before you get the top area of the cylinder wall cut flush with the rest of the cylinder or cut enough to remove the piston.

Prior to joining the military, I worked for quite a few years in a few repair shops and dealership, plus on my own. Am looking forward to when I will be getting out. I hope to go into the repair and restoration on the side and hopefully make enough money at to support the hobby.

Good Luck with your project, I hope it all turns out well.

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