A freinds motor blew 1 of the larger oil galley plugs out the back of the case,has anyone seen this and what size drill bit and tap would i need to fix it.

Here is some info on you request, but I don't know what size you will need depending on how large the hole is.

NPT National Pipe Thread
Tap size. Threads per inch. Drill size.
1/8 - 27 - 11/32
1/4 - 18 - 7/16
3/8 - 18 - 19/32
1/2 - 14 - 23/32
3/4 - 14 - 15/16
1 - 11-1/2 - 1-5/32

_________________
"Loud pipes saves lives"

Best if you use a tapered reamer along with that tap drill.
3/8" NPT is the most common plug for the bigger galley.
Here is a good site for some pointers on galley plugs.

http://www.huelsmann.us/bugman/FilterTech.html

_________________
Gary

Turbo VW Sand Racer
Polaris Ranger



"If you don't run into the Devil every once in awhile, you must be going in the same direction!"

Davis Motorsports FaceBook Page

That site and chart is a big help,thanks alot Gary.