Pedcock thread size

R

RebuildD1105

New member

Equipment
D1105 engine
Dec 15, 2019
1
0
0
California
Searching for the thread size for water drain cock hole in a Kubota diesel D1105-E engine. My water pedcock broke off and I need to chase the threads prior to installing a new part. I believe the replacement part is Kubota 15841-73020. I purchased a replacement that came in a bag marked as Onan 185-5490 Cock-Assy. Do you know this thread size or can you direct me to who might?
 
dlundblad

dlundblad

Member

Equipment
G5200, L2501, ZD1211
May 16, 2009
503
10
18
IN
Can you take the part to the hardware store?

Should be a tapered pipe thread.
 
D

DustyRusty

Well-known member

Equipment
2020 BX23S, BX2822 Snowblower, Curtis Deluxe Cab,
Nov 8, 2015
5,137
3,821
113
North East CT
Can't say exactly what yours is, but many in the automotive field us 1/8" NPT (National Pipe Thread). I have also seen 1/4-28 machine thread, and checking the O'Reillys website, I see the following sizes listed:
M10-1.25
M12-1.25
M14-1.50
5/8-18 Inch

This leads me to believe that there is no universal size. Back in the 1960's, the common size was 1/8 NPT. If you have to rethread the fitting, then the choice is yours. Just pick the one that you can get a tap easily, and won't be too large.

https://www.oreillyauto.com/shop/b/cooling---heating-16773/radiator-drain-petcock-11358/fc5e9fcf4fd6
 
North Idaho Wolfman

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
28,592
5,050
113
Sandpoint, ID
It's probably BSPT, it will be the same size as NPT but a different thread taper.
 
GeoHorn

GeoHorn

Well-known member
Lifetime Member

Equipment
M4700DT, LA1002FEL, Ferguson5-8B Compactor-Roller, 10KDumpTrailer, RTV-X900
May 18, 2018
5,681
3,008
113
Texas
Take it to a machine shop if you don***8217;t have a thread-gauge, and they can use a thread gauge to tell you what it is. (Most likely 1/8 NPT. One way to determine is to take it to a hardware store and see if it will thread into a 1/8NPT fitting.)
 
Last edited:
North Idaho Wolfman

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
28,592
5,050
113
Sandpoint, ID
GeoHorn said:
Take it to a machine shop if you don***8217;t have a thread-gauge, and they can use a thread gauge to tell you what it is. (Most likely 1/8 NPT. One way to determine is to take it to a hardware store and see if it will thread into a 1/8NPT fitting.)
Click to expand...
Most likely 1/8 or 1/4 BSPT, Kubota engines almost never come with NPT fittings. ;)
 
Last edited:
You must log in or register to reply here.

Top Bottom