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Post by SkiPro on Jan 23, 2009 17:01:16 GMT -5
Hi,
Does any one know if there is any difference between the 330 Piston Ring Part #93823 and Part #96510 also John Deere part #UP07441 ? I ordered some piston rings under the part #93823 and they were much thicker then the 96510's that I had. I've rebuilt about 10 of these saws and have never run across a 330 piston that used these thicker rings. Was there a change after a certain lot number or were these rings simply mislabeled? Any info would be appreciated.
Mark
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Post by SkiPro on Jan 30, 2009 13:45:04 GMT -5
I'll attempt to answer my own question. I found a 330 piston that indeed uses the thicker 93823 piston rings. the IPL for the 330 that lists the piston rings as part #93823 lists the piston as part #A-95882. Later versions of the IPL list the piston rings as part #96510 and lists the piston as part #A-95882-A. I'm guessing the -A is the difference. Still not sure when this change occured.
Mark
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Post by lesorubcheek on Jan 30, 2009 13:59:58 GMT -5
That's some interesting information Mark. I only have a couple of 330s and the only IPL I've looked at shows the thin rings only. I would have made the guess that it maybe belonged on some specialty application. I know for instance the DM-50 uses the 450 as a basis, but has a thick-ring piston. I've seen pics of a DM-20, but don't know anything about it, but was kinda thinking it may use soemthing like what you have described. Its an eye opener to hear that some 330s actually came with thick rings.
Dan
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neal
Groundie
Posts: 3
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Post by neal on Jun 3, 2020 12:42:20 GMT -5
Greetings, to my knowledge as a homeowner type of user/repairer...what I've found is this.
It appears the older 330's like the one my dad bought in the 1970's used a thick ring of about 0.046 inch thick. Apparently, later years Homelite may have changed to a thin ring of about 0.025 inch (about).
I looked up some part numbers and for my 330 that has a number (I assume a production number) of #10608. The parts diagrams for this saw showed part #96510 and the UP 07441. I ordered a new old stock still in original package for 96510 and surprise it was the thin ring of 0.02 inch.
I then dug around on ebay and fortunately, a guy had noted that the thicker ring of 0.045 inch was part number piston ring # 93823. so I searched this part number and sure enough I found several listed as the correct thickness of 0.045 inch. I've never seen this part number of 93823 in a parts diagram...yet...I must have a wrong parts diagram or something.
lessoned learned: the parts diagrams must have been for newer saws despite having the correct model 330 and #10608 listed....OR, they superseded the thick rings with the thin rings for some reason. The question I have if this is the case...the thin ring will move a lot in the land groove of the piston.
neal
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Post by sweepleader on Jun 3, 2020 12:50:23 GMT -5
Welcome to the House of Homelite.
I don't know for certain but I believe the thin ring takes less power to run thus more power out the crankshaft and less friction so less heat to the cylinder wall. Homelite may have only sold them as a set with the piston therefor no need to list a separate part number. That last is conjecture on my part and someone will be along to correct me.
Never install a ring in a groove with that much clearance, trouble will surely result in a hurry.
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