Plug size for air injection? (1 Viewer)

Joined
Aug 11, 2005
Messages
110
Location
Gig Harbor, WA
Can anyone please tell me the correct size/threads, etc for 1978 FJ40 2F engine? The air rail is coming off this weekend for a set of Downey headers (without the EGR fitting), and I'd like to source appropriate plugs beforehand. Thanks.

Looks like a search reveals 1/4 NPT?? So...never mind!! Thanks anyway...
 

cruiserbrett

Moderator
Joined
Feb 19, 2002
Messages
2,565
Location
San Diego
 
 
 
 
bull said:
you can use the 1/4"NPT plugs for plugging off the ports, or FJ62's had two plugs in the cylinder heads from the factory, and you can get the plugs from toyota.
 
Joined
Nov 14, 2004
Messages
3,399
Location
PNW
 
 
 
Or you can just make some. I did that once and made them flush to the head with screwdriver slots. Disapeared under a coat of black paint.
 
Joined
Jan 31, 2005
Messages
3,782
Location
Denver CO
 
 
 
1/4 NPT is actually close, but not quite there...it's a little small. The actual size and pitch is M14 x 1.5 IIRC, now I can't find the post I made where I confirmed that...I still had exhaust leaking out with the 1/4 NPT. If you take it in and compare the threads you'll find it. Try to find a metric supply company near you. :popcorn:
 
Joined
Feb 24, 2004
Messages
1,628
Location
Monroe, WA
 
 
 
subzali said:
M14 x 1.5
I searched for a LONG time both at local 'got everything' bolt houses and online sources and never was able to find a suitable plug with the correct threads. I wanted a recessed allen head plug - not a big bolt head sticking out. AFAIK, no such animal exists, although the 3FE factory plug sounds promising.

The brass 1/4" NPT plugs can be had at any hardware store and they seal fine in my experience. A little high-temp sealant or loctite probably isn't a bad idea, though.
 
Joined
Sep 26, 2005
Messages
86
Location
JP, MA 02130
I just had the Man-A-Fre 2-piece headers put on my '78 FJ40 and when the shop was doing the work they found my EGR and Air injection were toast. (oh gee, too bad.) It was recommended that i use 1/4" brass allen head pipe plugs to plug up the air injection ports. I found them on-line at:http://www.kimcoweb.com.

the question now is, what sort of plug do i use to fill the pipe the comes off the carb where the EGR attached. Does this need to be heat resistant? Seems not as the exhaust manifold is now divorced from the Intake.

the other issue is finding a nice way to cap the pipe that comes off the air cleaner top that fed air to the air pump. Specter shows one that was apparently available for Canada, but is discontinued. i was just going to use a big black rubber stopper and jam it in there with a bead of weather strip cement around it.

any thoughts?

btw, i LOVE the way i can hear the CO2 molecules singing in the headers as i accelerate. my shop acknowledged that the Man-A-Fre tuned 2-piece headers are the nicest they've installed and they do a lot of Cruiser work.
 
Last edited:
Joined
Sep 26, 2005
Messages
86
Location
JP, MA 02130
oh and i've owned my truck since February of '82. yeah, i'm a lifer.

did a 1st gen suspension correction 15 years ago as well as Canadian Vac. Adv. Dist and Carb. otherwise pretty much stock, though i made the mistake of a Mallotte Fiberglass tub and front end parts. I'm now back to an entirely OEM steel front end, and just replaced my badly rotted driver's door with a NOS one. sweet. Got a NOS left Ambulance door that will go on soon. Still looking for RT Ambulance and passenger doors in good consdition.

i laugh and say that at some point, even though the VIN is the same, every part on the vehicle will eventually turn over so it will be like building a new city on top of old.

yep, there ya go. bury me in my Cruiser.
 

Colorado Boy-74-FJ40

I may grow older but I refuse to grow up!
Joined
Aug 5, 2005
Messages
1,462
Location
Windsor Colorado
 
Air filter hole

I used an aluminum An plug for plugging the hole coming from the air filter. I RTV'd it in place and painted it black. seems to work pretty well
cap.jpg
 
Joined
Dec 23, 2003
Messages
3,772
Location
Payson, AZ
 
 
 
e rock said:
I searched for a LONG time both at local 'got everything' bolt houses and online sources and never was able to find a suitable plug with the correct threads. I wanted a recessed allen head plug
my local ACE hardware has them,,, at least they did when i bought 6
 

bkfj40

Wishin i was in Wydaho
SILVER Star
Joined
Apr 5, 2002
Messages
3,159
Location
new erection, va
 
 
 
 
Colorado Boy-74-FJ40 said:
I used an aluminum An plug for plugging the hole coming from the air filter. I RTV'd it in place and painted it black. seems to work pretty well
my eyes hurt when I look at that picture....

bk
 
Joined
Sep 26, 2005
Messages
86
Location
JP, MA 02130
sorry to have hijacked this thread with the puzzling about other plugs. i posted the full deets on where to get brass 1/4" plugs in a seperate thread.

that said, yeah i'm havin a hard time seeing what's going on in the shot above. for the air cleaner hole i just jammed a black rubber stopper in and that should do it.

now to figure out what to plug the EGR port on my carb with.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top Bottom