#8 injector change

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Sep 19, 2013 | 08:49 PM

powerfloat

Thread Starter

New User

Joined: Sep 2013

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#8 injector change

You all have me scared about autolite glow-plugs from a previous threads so I will be pulling my driver side valve cover to see what type the previous owner put in. While I'm in there, I have been considering changing the #8 injector from the AE LL to a plain old AD injector now that I have a regulated fuel return mod installed. Does anyone have any experience with this? good idea or bad idea?

Sep 19, 2013 | 11:52 PM

Traildust

Mountain Pass

Joined: Feb 2004

Posts: 212

Likes: 11

From: Fallon, NV

I replaced my #8 AE for a regular AD Injector. It was three or four years ago but I can say it was a fairly straight foward job, just make sure you get all the oil/fuel out of the cylinder before you turn it over the first time. I have not had any trouble with it since. It did reduce the knocking sound by about 25% at most.

Sep 19, 2013 | 11:55 PM

jgilrfr

Laughing Gas

Joined: Aug 2008

Posts: 804

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From: Staten Island,hamilton ny

#8 isnt too bad to do i just did all 8,dont loosen the top bolt, remove the oil deflector and the bottom bolt slide the plate up and pry under it leveraging from the top and it will pop out

Sep 19, 2013 | 11:56 PM

jgilrfr

Laughing Gas

Joined: Aug 2008

Posts: 804

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From: Staten Island,hamilton ny

also torque all the top bolts to the same amount 12 ft lbs while you are at it

Sep 20, 2013 | 06:38 AM

Tugly

Hotshot

Joined: Jan 2011

Posts: 18,849

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From: Puget Sound

Quote:

Originally Posted by jgilrfr

also torque all the top bolts to the same amount 12 ft lbs while you are at it

I had a ft/lb torque wrench when I did mine and my injector hold-down bolt problems were epic... really. Acquire an in/lb torque wrench, even if it's rented or borrowed. THe spec calls for 120 in/lbs, many recommend 130 in/lbs, and I read a magazine article where they urge 140 in/lbs. With such varying opinions and my experience with this, that 120 in/lbs seems to be inadequate. I ultimately landed on 130 in/lbs, with an extra 1/8th-turn for good measure.

Drain your fuel bowl before you pull the stick, it sends less fuel into your oil.

Don't install anything until you've consulted with us on how to clear all the fluid out of the cylinder.

Sep 21, 2013 | 12:34 AM

Bonanza35

Lead Driver

Joined: Sep 2005

Posts: 9,399

Likes: 188

From: Norco,CA

Any reason you want to change the #8 Injector? Dose it knock bad or you just want to do it. I did change mine but it still had a fuel knock with FRX. Fuel tank mods should be done also.