If that doesn’t work out you might want to try a Case-IH dealer. They used the Mitsu for their compact tractors for a number of years.
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Upgrade NowThx for the information. After more research I found the NGK spec plug p/n of NGK-724U but it discontinued everywhere. I found them on JEGS, placed the order and it was canceled. Thx for your link included above. Looking at the images, it appears the tip diameter is the larger (5mm) variety. My application (Mitsubishi 3SL engine) although stated as compliant needs the 4mm diameter. The electrode diameter is not included at all in any specs - head scratcher! I have some plugs on order from both Ebay and Amazon, one due today. I cast a wide net hoping to find 4mm GPs that will work.Doing some surfing, it appears the Mitsu number is 32a66-03100. OR 32a66-03101 OR 32a66-03102. Is your NGK # a cross for these mitsu numbers? Heres the description that i got for the NGK 6628:
I think your auto store needs to try again.
Attributes Brand: NGK
Contents: NGK metal Type Glow Plug w/Mounting Nut
Glow Plug Electrical Rating: 10.5 Volts
Glow Plug Hex Size: 12 mm
Glow Plug Thread Size: 10 mm
Glow Tube Length: 22 mm
Manufacturer: NGK Spark Plugs
Manufacturer Part Number: Y-107V
Overall Length: 84 mm
SDS Required: No
Terminal Type: Stud
UNSPSC: 26101724
VMRS Code: 033003004
Voltage: 10.5 V
https://www.mymromarts.com/glow-plu...sbVpCEM-0p2EBIYiQ2-pQzD9ZT0n3vJAaAldKEALw_wcB
Actually the good folks at Messicks would probably be willing to measure one for you. Give them a call.Just looked up the IH/Case IH part number. 1273118-C1 glow plug was used in all of the compact diesels (234, 244, 254, 235, 245, 255). Messicks has one in stock. It might be worth giving it a shot.
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