Hey guys...

Just curious if anyone has ever used something like this...

O2 Oxygen Sensor Weld Bung "Adaptor" Stainless Steel M18MM 1 5mm x M12MM 1 25mm | eBay

To use the cheaper / more readily available 12mm glow plugs?

From reading, the stock loop plug uses an 18mm 1.5 thread... the new plugs use a 12mm 1.25 thread.

Apparently its a common o2 sensor adapter that can be had for fairly cheap... ($6 or so)

Just curious..

It looks like (if this will work which it should...)

Cost of the adapter + new bosch 80006 glow plug would still be cheaper then the bosch 80035 conversion plug... and new plugs would be very easy to come by if need be.

Thoughts?

I will most likely try it... also after the cost of the adapter, new bosch 80006 plugs can be had for $8 each... less then half of the 80035.

There is a Member who did make adapters for himself to allow the the 12mm Glow Plugs to be used in the 18mm Holes. However, he was a machinist and had knowlege and equipment and time wise it would not be worth the Money.
With the Adapter Glow Plugs you need to match the external dimensions of the 18mm Plugs and then match the internal dimensions of the 12mm Glow Plugs (the 12mm Plugs seal on the angled shoulder right behind the tip/heater Element.

I think that this it the thread of that I have in my notes:
Glow Plug Adapter, regular Pencil to fit Filiment type.
http://www.peachparts.com/shopforum/showthread.php?t=282022

If you can also do it go-for-it.

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84 300D, 82 Volvo 244Gl Diesel

I see what you are saying... didn't realize how they sealed.

A threaded bushing as I posted wouldn't work as they have no seat. Ive got the equipment to do just that, however, not worth the effort/time. If a simple bushing could have done the trick... sure.. but hours of machine work makes it not worth it.

Thanks for posting that.
-Chris

What do you mean not worth the time ? If you have the equipment you should do it...
it will keep you out of the bars and out of trouble for several nights....

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Lol... just have much bigger fish to fry and need to replace these stock GPs sooner then later. With my current work schedule, etc... just not in the cards.

I may tinker with it down the road or perhaps a winter project.

-Chris

Than OM616 for the thread.

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84 300D, 82 Volvo 244Gl Diesel

The Bosch 80035 Adapter Glow Plugs seem to be extremely reliable as long as your Injectors are not so bad that the spray gets on them.

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84 300D, 82 Volvo 244Gl Diesel

I'm sure they work well... just aren't as easy to come by when out on the road and are a bit more expensive. The 12mm plugs can be had at darn near any parts store where the 18mm plugs are hard to find for under 20 each at a place that actually has 4 in stock at the same time.. lol. I suppose my main concern for them is ease of finding them at a reasonable price. I had heard they were or had been discontinued by Bosch... not sure if there is any truth to it or not.

I'll go with the 80035s for the time being.. I'm sure they will do the trick and serve their purpose.

We all handle things differently. I would just carry some spare Glow Plugs.

If no spares Starting Fluid in an emergency starting fluid is available in any Auto Parts store.

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84 300D, 82 Volvo 244Gl Diesel

One thing to consider is that your adapter and new glow plugs fill the same volume, otherwise you will change the compression ratio. On the flip side, making them fill more volume could help an engine w/ worn rings and low compression.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

This is what OM616 said in his thread as part of the reason he made the adapter.

"I made the adapters instead of buying the special pencil plugs because I like use standard parts that I can get anywhere, any time. Plus I did not like how the special plugs did not take up as much volume as the loop plugs do"

Using the Adapter Bosch 80035 Glow Plugs decreases the compression a bit because they do not fill up the same voume as the loop/filiment type glow plugs do in the precombustion chamber.
However during starting th fact that the 80035s creat more heat for starting then the stoc ones do counters the loss of compression during starting.

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84 300D, 82 Volvo 244Gl Diesel

do you think it would be possible to simply
re wire the old loop type as per the upgrade pencil type
BUT with a resistor in line to bring the voltage down to just under the maximum
that these loop type will take before meltdown?? rather than the wiggly bar resistance idea that wastes energy and under powers them.
wouldnt that be a cheap easier option if its feasable?
i have a hard starting 240d sedan and i am very curious.

unless somebody knows another pencil type plug that fits???
im sure its out there.

No experience, but recall reading that the older loop-type were wired in series. The new type are wired in parallel, so see full battery voltage, so you would need to add parallel wires to them.

Besides O2 sensor bungs, I recall that some spark plugs have the same thread as O2 sensors. Indeed, some cheapsters use an old spark plug as a bung plug. I think there are only 2 sizes of spark plug threads. If true, you can buy an "anti-fouling adapter" at any auto parts (Help line), and it might be easier to fab a glow-plug adapter from one.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

The adapter Glow Plugs also put out more heat faster and are more reliable then the Filament/Loop type Glow Plugs. They are win wins.

What I got form the OP is that he wanted to wire the original Glow Plugs the same way as the Adapter Glow Plugs but with individual Resistors to reduce the Voltage to each Glow plug. Eliminating the zig-zag Wires and the series wiring.

While I think it is possible the results are not worth the trouble.

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84 300D, 82 Volvo 244Gl Diesel