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Removing Pistons from WD-45

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Jon

08-10-2002 20:37:18




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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 build up. 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, 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. 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? It feels like a pretty distinct ridge.

Jon

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Bill Hires

08-11-2002 13:08:41




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 Re: Removing Pistons from WD-45 in reply to Jon, 08-10-2002 20:37:18  
Use a ridge reamer to remove the ridge before removing the pistons, this is not difficult.If this is not done the compression ring,or ring land will be damaged. Using an inside mike measure cylinder taper and out of round at both top and bottom of piston travel. The recommended piston skirt clearance is .0025-.0045 with a maximum clearance of .010 for service. You can measure the ring end gap as an indication of wear. Recommended end gap of all rings is .007-.017. Recommended side clearance is .001-.0025. Any measurement beyond these require the sleeves and pistons be replaced. There are rules for installing sleeves and pistons.

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Jon

08-12-2002 05:29:41




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 Re: Re: Removing Pistons from WD-45 in reply to Bill Hires, 08-11-2002 13:08:41  
Thank you Bill, for that insight. It sounds very do-able after reading your post and other info on this and other sites. I picked up a ridge reamer today from Autozone (they lend them for FREE with a deposit - can't beat that!), and will give it a whirl and take measurements later. One follow up, is cutting oil useful in this situation?

Thanks again,

Jon



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