Air Injection Plug

Capt Bob · Capt Bob's Garage

Had an air injection plug blow out last night from Nr 1 cylinder of my 1982 Euro 930. I found identical replacement plugs on Partsklassic.com.

Anyone have any recommendations regarding who to buy them from and since one blew out should I change the remaining five? Any special installation procedures to ensure they don't blow out again?

Thanks

Alexm930 · Alexm930's Garage

I got mine from Patrick racing. Read here on the forums that some guys had them loosen & back out. I have not had this happen. I did not use any locktite. If your threads are in good shape just replace & check others for snugness.

T77911S · 08-17-2017, 04:55 AM

I had one come out on my 2.7. man that was loud. scared the crap out of me.

you need to check the threads to make sure they are still good.
i used epoxy on it the first time and that lasted about 2yrs. I ended up putting in a helicoil because the threads stripped out the first time

I don't think what you put In matters if the threads are good unless the plugs are different lengths. IE, a short threaded plug may not be good.

Capt Bob · Capt Bob's Garage

As best I could see the threads looked OK, but will find out when I put the replacement one back in. I will also go around and check the other (5).

Ken911 · 08-17-2017, 05:19 AM

had them blow out before even with red loctite. the temp is too high for the loctite. I took a center punch punched a small divot in the threads of each one. it doesnt destroy the threads but they will not back out.

flightlead404 · flightlead404's Garage

I drilled mine and safety wired them

Capt Bob · Capt Bob's Garage

All the others were tight so that was good. I ran a 10X1.0 tap up there in the Nr 1 cyl air port, cleaned the threads but when that plug blew out it ripped out the threads. So I put a new plug in but without much thread depth remaining in the head I could not get any bite. So I ended up installing a Helicoil and reinstalled the plug. The plug is in tight now and I took the car out for a test ride...all good!

Tom F2 · 08-22-2017, 08:34 AM

A 1/8 NPT plug is very close to the same size. If your threads are a little messed up, the taper on the pipe plug might do the trick. They're available at NAPA, O'Reilly's, etc.

TurboKraft · 08-22-2017, 09:37 AM

Good repair, Capt. Bob.

We use metric shouldered plugs with a crush washer, $18/set. Never had one come out while driving.

NO NPT!!! There is such thing as a metric tapered plug, useful if your threads are a little fubar and you haven't got a helicoil or Time-sert kit.

Alan L · Alan L's Garage

There is a tapered 914 brake plug - brass- you will find it in the Pelican parts list. Fits perfect and stays there. Ask me how I know. Loosing one on the track is no fun. You think your day and engine is done.
Alan

Tom F2 · 08-23-2017, 02:38 AM

Quote:

Originally Posted by TurboKraft

NO NPT!!! There is such thing as a metric tapered plug, useful if your threads are a little fubar and you haven't got a helicoil or Time-sert kit.

They work fine, just don't put too much force on them. The threads in the head will be fine, too, when you're ready to put in a correct plug. If you're stuck, 1/8 NPT is an easy, temporary fix.