Need Help! D448 piston - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 11 (permalink) Old 08-05-2016, 03:09 PM Thread Starter
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Need Help! D448 piston

Can anyone here help me out with a source for a replacement piston for my D-Series lawn boy I've been looking and even made a monumental mistake buying a F-Series piston.

I cannot find a single source that has them in stock either locally or on-line. Please help me get my 44 year old engine performing at peak efficency! TIA.
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post #2 of 11 (permalink) Old 08-05-2016, 04:44 PM
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Hi! This is apparently going to become an issue if some of the aftermarket suppliers don't start making them available again. I recently bought 5 aftermarket ones and kept one to use and sold the rest through MTF. Is your piston usable? Maybe you could just clean it up and hone the cylinder and install new rings. Not sure if oldlawnboy on MTF would have any more. Bill

1968 Lawnboy 3054 Mower
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post #3 of 11 (permalink) Old 08-05-2016, 05:14 PM Thread Starter
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That could be my only option, I'm going to post up some pictures and you can tell me what you think OK?
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post #4 of 11 (permalink) Old 08-05-2016, 10:27 PM
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I don't have anymore either, like Bill I had bought about 5 extra and sold them all to MTF members. Your best bet I think is ebay, they show up from time to time. Right now there is a seller who claims that he has a Stens 515-510 that will sub as a Lawnboy piston 606607, which is the part number you need, but I could find nothing to back up that claim.

I think you could reuse that piston if you had to, just clean up the scoring, hone the cylinder, install new rings and I think you would be back in business.
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post #5 of 11 (permalink) Old 08-05-2016, 10:59 PM Thread Starter
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That's what I'm going to do. I saw that auction but the rest of the listing is for a Briggs part.... Thanks
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post #6 of 11 (permalink) Old 08-05-2016, 11:16 PM
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Not an expert on small engine rebuilding by any means but I would think as Lawnboy77 said, if you can clean up that piston and install new rings you may be fine. The piston itself doesn't really seal anything. If there are any rough areas you can probably dress them up with a very fine file or a stone and then polish up with a ScotchBrite pad. The rings do all the work. Make sure there is no aluminum residue in the cast iron sleeve in the cylinder. If there is I understand that it can be removed with muratic acid. Be sure to give the cylinder a light hone to get the cross hatch pattern that allows the new rings to seat. Also be sure to check your ring gap with the ring in the cylinder but not on the piston and then stagger the end gaps avoiding the port area. Good luck and keep us posted. Bill

1968 Lawnboy 3054 Mower
1973 Lawnboy 8231 Mower
1975 Lawnboy 5024 Mower
1975 Lawnboy 5273 Mower
1976 Lawnboy 5274 Mower
1977 Lawnboy 5024 Mower
1980 Lawnboy 7268 Mower
1982 Lawnboy 5247 Mower
1982 Lawnboy 5247 Mower
1972 Lawnboy 1015 Edger
1972 Lawnboy 1015 Edger
1987 Lawnboy 1400CL Trimmer

Where there's a will, there's Mr. Bill!
They don't call me MacGyver for nothing!
I have LBAD and DCAD!
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post #7 of 11 (permalink) Old 08-06-2016, 12:39 AM Thread Starter
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Will Do!
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post #8 of 11 (permalink) Old 11-14-2019, 08:13 AM
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Quote:
Originally Posted by Yard Nazi View Post
Not an expert on small engine rebuilding by any means but I would think as Lawnboy77 said, if you can clean up that piston and install new rings you may be fine. The piston itself doesn't really seal anything. If there are any rough areas you can probably dress them up with a very fine file or a stone and then polish up with a ScotchBrite pad. The rings do all the work. Make sure there is no aluminum residue in the cast iron sleeve in the cylinder. If there is I understand that it can be removed with muratic acid. Be sure to give the cylinder a light hone to get the cross hatch pattern that allows the new rings to seat. Also be sure to check your ring gap with the ring in the cylinder but not on the piston and then stagger the end gaps avoiding the port area. Good luck and keep us posted. Bill
What is the proper ring gap?
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post #9 of 11 (permalink) Old 11-15-2019, 12:04 AM
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Ring gap is .015 to .025. Place ring in cylinder and push in square with the piston. Check ring gap at top, middle and bottom. I am guessing when the rings are manufactured they are a bit large so they can be filed to the proper gap. Bill

1968 Lawnboy 3054 Mower
1973 Lawnboy 8231 Mower
1975 Lawnboy 5024 Mower
1975 Lawnboy 5273 Mower
1976 Lawnboy 5274 Mower
1977 Lawnboy 5024 Mower
1980 Lawnboy 7268 Mower
1982 Lawnboy 5247 Mower
1982 Lawnboy 5247 Mower
1972 Lawnboy 1015 Edger
1972 Lawnboy 1015 Edger
1987 Lawnboy 1400CL Trimmer

Where there's a will, there's Mr. Bill!
They don't call me MacGyver for nothing!
I have LBAD and DCAD!
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post #10 of 11 (permalink) Old 11-15-2019, 12:04 PM
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Thank You
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