May 4, 2009The other day I climbed under the hood of my 89 Chevy Fullsize blazer to change the spark plugs, and go figure one of the old rusty sparkplugs threading broke off right inside the block.. I should be able to take a wrench and tap to it and rethread for the new spark plug.. Anyone know what size tap will do the job? Thanks
Forums : Engines-Gasoline : What size tap? (91 Views)
May 4, 2009It''s 14 mm, not sure of the pitch. Use an easy-out and some heat to get the plug out if it is still in the head.
May 4, 200914mm sounds correct
check with any auto parts store. they make a specific tap for just spark plugs
what i wold do is get a new plug for the truck and match it to the tap then grease up the tap before you run it threw the block, that way the metal shavings stay on the tap and not end up in your motor
May 17, 2009wheel bearing grease would be the best
something that is very sticky so that it will hold the shavings from the tap
May 26, 2009The Plug isn''t in the threading the threading is the only thing in the block, probably be better off tappin it huh?
May 26, 2009Parts store should have a kit with a remover for the threads left in the block and then a tap to clean up the threads.Be careful if you apply heat, could melt injector *or* have a small fire. Best to use penetrant to help remove the old part of the plug.
Let us know how it goes.