What is the part number for the recomended glowplug replacement for a 84, 6.2L ? There is a "new" one right?

as far as I understand it, there are 9G, 11G, and 60G. from oldest to newest. I believe that 11G is the best for standard setups, while 60G is best for manual switches.

9G's like to overheat and mushroom, then a pain to get out. JUNK. Though, when i got my truck I redid my glowplugs, they where 9G. but none were swollen.

11G's are a lower chance of swelling, but still possible. with the standard on-off duration of the glow plug system its rare as I understand it.

60G are best for manual switch since they take a bit to warm up. but they are self limiting so they dont over heat, so with a switch you can pretty much cycle them as long as you want. just remember not to leave them on!

TFL,

Would the 60gs still be recommended with the stock glow plug controller? No manual switch...or would the 11gs be a better choice here?

Exactly the question I was going to ask.......

My experience depends on the timing of the controller. Some controllers inherently stay on longer than others. My pickup controller stays on 10-11 seconds. My suburban, 7-9 seconds. The wear and general condition of the engine (i.e. compression) adds to the mix.

The 11G's seem to work best in an engine that has lost a little of it's "get up and go". My pickup starts best with the 11G's because of general loss of compression/normal wear. I tried the 60G's and had to cycle the plugs two or three times when cold. The 11G's start on the first cycle if I "pre-fuel" it by cranking the engine for about one to two seconds before allowing the glo-plugs to heat up. The one negative on my pickup is that the plugs cycle even when the engine is warmed up, though not as long as when the engine is cold. The truck was built prior to the "glo-plug inhibit switch" system, which was added the next year.

The suburban now has the later style 4-wire controller that stays on for up to 20 seconds. I installed 60g's and a backup manual override switch on it. On cold mornings, I wait until the relay turns off, push and hold the manual override switch for an additional 10-20 seconds and it usually starts first try. The original controller just wouldn't stay on long enough for a quick start when cold.

I can't say why the early 6.2 (gray, white label, six pins, screws in the lt. cyl. head water outlet cover at rear of the engine) controller has such a wide range of "on" time. I just know from lots of experience, they are all different. I've installed several new ones in the same engine and had wide differences in the amount of "on" time. It's frustrating when you have a marginal engine that needs just a little more time on the glo-plugs to start and you (the customer) are forced to cycle the plugs several times to accomplish the mission. That's why lots of us have added the manual bypass system.

Would the 60gs still be recommended with the stock glow plug controller? No manual switch...or would the 11gs be a better choice here?

Simkins and CR, Fred pretty much summed it up. I really dont think 60's would work good in a stock setup because they dont warm up enough with the time it cycles. Add your own switch and theyd work fine.

Im actually using 11g in my truck right now, and they seem to work fine. I put them in, in place of the stock 9G's I think, before this past winter, and honestly I still had to wait a couple of cycles after 2-3 attempt of cranking. But they still worked.

On another note, I came across some 15G recently. Apparently for the 24V military 6.2L engines?

Also, just so you know...when I changed my plugs out, the headers were in the way for 6 out of the 8 plugs I changed. A few tips(the electrical end) actually broke on extraction. hard going in but no breaks. but its not liek you change them often!

Fred/TFL....

Thanks for the info. I don't think the AC60gs would work well in my neck of the woods. I'm in an area that is at least 90degrees F or hotter for 11months out of the year!

I'm guessing that I will run 11g's with the stock setup.

Thanks again.

I doubt you will have any problems. good luck with them!

Lots of issues with glo-plugs but nothing a little work won't solve. There are many ways to address it and I think we've covered most of them. Just use good judgement and you'll have success. These guys won't steer you wrong, it's just that each engine responds differently. Like we said, you should be fine. Fred

Fred: If your glow plugs still cycle when your engine is warm then your temp. controller in the right rear cylinder head is bad. And doesn't the glow plug controller in the left rear head also have a temp. limiter? The electrical schematic that I saw years ago had one so maybe it has also failed.

When I installed a manual switch, I kept the temp. controller in the circuit so my glow plugs will not go on when the engine is warm.