B6000 Glow Plug Thread Size?

warmblood58

Member

Equipment
B6000DT
Dec 28, 2022
77
20
8
Jacksonville Oregon
Is there a common tap size to ream my GP threads - used to have a Mercedes glow plug reamer - cannot find it. I've heard M10x1.0? I was able to back them out with PB blaster and lots of back and forth movement. Both GP's were a little loose which surprised me so no doubt a fair amount of carbon must have moved up into the threads. Installing the new GP's, I found they would go down a fair amount but met some resistance and I thought it best to back off a little vs forcing them because breaking a brand new GP in a head would be just plain stupid. Actually, it just occurred to me that I can take a GP to the hardware store and match thread with a metric nut to determine size and pitch and go from there. Both GP's had way too much resistance and lil 6000 was firing on compression alone - going to be nice to have working glow system soon!
 

North Idaho Wolfman

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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
30,234
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Sandpoint, ID
You can't / shouldn't ream the holes out as any material you ream will fall into the cylinder and could do some serious damage to the cylinders.
I would spray some Kroil, PB Blaster in the threads and re thread the glow in and out.
 

warmblood58

Member

Equipment
B6000DT
Dec 28, 2022
77
20
8
Jacksonville Oregon
You can't / shouldn't ream the holes out as any material you ream will fall into the cylinder and could do some serious damage to the cylinders.
I would spray some Kroil, PB Blaster in the threads and re thread the glow in and out.
I might just shoot some carb cleaner (to dissolve the carbon) and using an old glow work it in and out so I can get new glow to thread all the way down and seat
 

North Idaho Wolfman

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Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
30,234
6,397
113
Sandpoint, ID
I might just shoot some carb cleaner (to dissolve the carbon) and using an old glow work it in and out so I can get new glow to thread all the way down and seat
Would be a safer bet, as it won't pull metal off.
 

TheOldHokie

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L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
Apr 6, 2021
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Myersville, MD
windyridgefarm.us
Is there a common tap size to ream my GP threads - used to have a Mercedes glow plug reamer - cannot find it. I've heard M10x1.0? I was able to back them out with PB blaster and lots of back and forth movement. Both GP's were a little loose which surprised me so no doubt a fair amount of carbon must have moved up into the threads. Installing the new GP's, I found they would go down a fair amount but met some resistance and I thought it best to back off a little vs forcing them because breaking a brand new GP in a head would be just plain stupid. Actually, it just occurred to me that I can take a GP to the hardware store and match thread with a metric nut to determine size and pitch and go from there. Both GP's had way too much resistance and lil 6000 was firing on compression alone - going to be nice to have working glow system soon!
NGK Y107 - M10 X 1.25

Dan