What size is the freeze plug

2006 NISSAN SENTRA
200,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
Avatar
SHADOWFIREOMEGA
  • MEMBER
  • 2 POSTS
Cannot find this anywhere in the owner manual or via a quick search online. It's one of the center ones so expansion plugs won't work (really friggin shallow in there) so we are going with steel, but 1-1/4 is just too big, and 1-1/8 is much too small. I think it may be a 31mm, but don't have an accurate way to measure it. Bonus question, where the heck do you even get metric size freeze plugs?
Aug 12, 2019 at 5:32 PM
Advertisement
Avatar
DANNY L
  • CERTIFIED EXPERT
  • 5,648 POSTS
Hello, I'm Danny.

Do you have access to a micrometer? Quick math shows 1-1/4 equals 31.75mm and 1-1/4 equals 28.575mm I believe Napa auto parts sells metric freeze plugs. Hope this helps and thanks for using 2CarPros.

Danny-
Aug 12, 2019 at 6:21 PM
Avatar
SHADOWFIREOMEGA
  • MEMBER
  • 2 POSTS
Found out it was a 30mm, visited a machine shop where the mechanic/machinist was working on an identical engine!
Aug 14, 2019 at 3:24 PM
Advertisement
Avatar
DANNY L
  • CERTIFIED EXPERT
  • 5,648 POSTS
Good news ! Thanks again for using 2CarPros,
Danny-
Aug 14, 2019 at 4:26 PM