Piston ring end gaps
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Thread: Piston ring end gaps

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    Piston ring end gaps

    I am replacing the rings on a JD40 tractor. Does anyone know what the proper end gap for the rings should be? My book only says they are sized correctly from the factory and does not give a number. The ones that I am replacing have about .100 gap, which seems way to much to me. They do not seem to have much wear and I think the engine was rebuilt around 1999 from the date on the rod bearings. Everything is standard bore. Thanks.

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    felixm22's Avatar
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    That does sound really high. I hope some one will be along with the correct answer for you. I did find a generic reference for autos, it was posted in a Hastings MFG catg.
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    Evergreen's Avatar
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    I checked the manuals for my Model M and couldn't find a spec for ring end-gap. Are they genuine JD parts?
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    dzldanz's Avatar
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    Quote Originally Posted by felixm22 View Post
    That does sound really high. I hope some one will be along with the correct answer for you. I did find a generic reference for autos, it was posted in a Hastings MFG catg.
    Good reference
    I would go with the hastings list
    Last edited by dzldanz; 02-26-2015 at 07:03 AM.
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    rings

    I can't tell what brand or part number the rings are. I am beginning to suspect that the wrong rings were used. I ordered a new set of hasting rings and I got them this morning. I will check the end gap on the new rings and see what it looks like.

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    dzldanz's Avatar
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    You NEED to determine if the piston and bore are std or oversize
    Current: 3320 HST cab with 59" front blower, Hydraulic chute deflector, Vertical Exhaust, Front Fenders,
    Grooved and loaded Front and Rear R-4's
    External Mirrors, Jensen Bluetooth Radio / Headset. Front Hydraulics
    Whelen warning lights, JD366 front blade
    Gone: X595 with heated cozy cab,stainless vertical exhaust

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    rings

    I checked the gap with the new rings and they have an end gap of about .020. That is what I am used to seeing on other engines. It appears that either the wrong rings were used last time or someone filed them down for some reason. On another matter, when I took the oil filter assembly off there was no filter in the canister. While cleaning the parts I noticed that the bottom oil filter plate (Looks like a big washer) is missing. The filter will not work without it. Does anyone know where I can buy one? I have done a quick search for one, but haven't found one yet.

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    filter plate

    I found a vendor selling the filter sealing plate, but better yet, I found the specs on it so that I can make my own. (I tend to be cheap :-) ) Thanks all.
    Evergreen likes this.

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