Anyone know what size the drain plug crush washer should be?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

18 MM

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2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Proudly supporting CRD vendors, and their development of quality parts and accessories.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

I never worry about new ones. Just clean up the old one and put a beat of RTV around it and use it again.

Race,

I just did my first oil change with the Fumoto valve. It was just too easy. The drain lines up perfectly with the hole in the skid. . . zero mess.

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'05 Sport CRD 107k miles. NOBODY knows everything.

TJ2,

I just might go that route.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

Just anneal and reuse the old one. Heat it up until it's dull red then quench it in cold water.

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Quenching metal in cold water tends to harden it. If you want it to be soft, let it air cool.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

That's a very general statement which, in fact, doesn't apply to all metals of which copper is one.

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18mm ID, 24mm OD

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2005 Limited CRD

18 MM is too big.

I bought a bag of them and they fit sloppy, the original crushed washer slides on tight.

I think it's either a 16 or 17MM.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

I've re-used the old one for 100,000 miles never did anything to it, it still works, don't over complicate a simple washer.

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O6 Limited CRD 4X4, Frankenlifted II, Magnaflow, EHM, ORM, 245/16 BFG, AllJ's Rear Rack, Lightforce Aux Lights, Tjm front bumper, Tmax winch, Scorpion diesel tuner and Baja Tested.

I'd guess 16 mm because I bought an assortment of copper washers at HF. The largest ones in the assortment didn't fit- they were 5/8". I could not find any metric ones.

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2006 CRD GDE ECO/HOT Tunes and TCM swap and HD Mopar Torque Converter, EHM
2003 Jetta TDI 155K all stock
1957 International V8 Diesel