So, I read on the Bosch website where Bosch 80035 glow plugs have been discontinued with no replacement. Anyone know of a good alternative?

https://www.boschsparkplugs.net/learning-center/article/509/discontinued-bosch-glow-plugs

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85 300D

I believe Monark and Heyco also make them. Look on US and UK ebay and buy some extras.
From what I have read the 80035 Glow Plugs seem to hold up well unless your Injectors are spraying poorly or there is some other issue like poor timing.

There are places that may not be out of stock.

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84 300D, 82 Volvo 244Gl Diesel

Bosch 80035/ 0250201044 (alternate number) Duraterm Glow Plug

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84 300D, 82 Volvo 244Gl Diesel

Bummer, I have one out on my car and gave my spares away, about time I got adaptors made up

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

Try looking on eBay.

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84 300D, 82 Volvo 244Gl Diesel

Yes true.

I also have a second purpose for my glow plug adaptors as an experiment however

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

Glow Plug Adapter, regular Pencil to fit Filament type.
http://www.peachparts.com/shopforum/showthread.php?t=282022

You could start of using some loop/filiment type Glow Plugs and see if you can rework the inside diameter of them.

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84 300D, 82 Volvo 244Gl Diesel

Yes, quite a good thread that one. Here's mine while I'm here Lowering compression ratio with special 'glow' plugs?

Think loop plugs have bit of a thin wall unfortunately. Used 80035s would be perfect but I've already bought 50mm M18 bolts from a hardware store just waiting for me to put them on the lathe.

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

What pitch are the threads?

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84 300D, 82 Volvo 244Gl Diesel

M18x1.5mm

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

That is the same size used to tap out the Oil Cooler on 300Ds with a turbo to accept the repiar nipples. Also older car spark plug holes.
Nice to have the possiblilty of double duty if you buy a tap.

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84 300D, 82 Volvo 244Gl Diesel