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Oil sump plug size
Posted: Sat Mar 01, 2014 1:53 pm
by Gumby
can someone tell me the thread pitch size of the 19mm oil sump plug?
Re: Oil sump plug size
Posted: Sat Mar 01, 2014 3:08 pm
by Locutus
M14x1.5
Re: Oil sump plug size
Posted: Sat Mar 01, 2014 9:51 pm
by Gumby
Locutus wrote:M14x1.5
not being rude but are you sure?, as i have recieved a magnetic sump plug from uk and its not fitting, apparently same size (M14x1.5)
Re: Oil sump plug size
Posted: Sat Mar 01, 2014 10:27 pm
by Locutus
Yes - that's the spec of the plug that I'm using and it fits perfectly.
Have you measured your new plug to verify the thread and pitch are correct?
Re: Oil sump plug size
Posted: Sun Mar 02, 2014 9:32 am
by project.r.racing
didn't the pitch and thread change pre and post 98?
Re: Oil sump plug size
Posted: Tue Mar 04, 2014 8:05 am
by Neat
My only listing for the engine drain plug is M14x1.5 and I sell drain plugs. It's not uncommon for the sump to be drilled and tapped to the next size e.g. m16x1.5 if it has been cross threaded in the past. Have you measured the plug that does fit?
Re: Oil sump plug size
Posted: Thu May 21, 2015 5:53 am
by telsun
Digging this question up from the archives as want to check the thread size on my 1990 MX5. Anyone confirm for sure please?