Urgent prechamber question
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Senior User
Joined: Oct 2007
Posts: 256
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From: Good old Oswego.
Urgent prechamber question
Hey People,
I'm finally starting the process of getting my truck going. One question.....how are the combustion prechambers held in place? Two of the ones on the engine I have are not in tight. Need help ASAP!!!!!!!!!
I'm finally starting the process of getting my truck going. One question.....how are the combustion prechambers held in place? Two of the ones on the engine I have are not in tight. Need help ASAP!!!!!!!!!
Laughing Gas
Joined: Feb 2007
Posts: 962
Likes: 89
From: upstate ny
i believe they are held in with an interference fit, i donno about our ford motors but the chevy 6.2s and 6.5s come loose from overheating. i noticed when i rebuilt my 7.3 i had the heads milled and each prechamber had what looked like a ***** punch mark on it when i got it back put im not sure y.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
They are interference fit. Removal and installation is done with a hammer, brass drift, and lots of care.
Once in the engine, part of the prechamber is pinched between the engine block and the head since it overlaps the fire ring. Are they actually rattling around and fall out by gravity?
Once in the engine, part of the prechamber is pinched between the engine block and the head since it overlaps the fire ring. Are they actually rattling around and fall out by gravity?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Here is the best picture I have of them installed.
You can see the slightly different color of the precup more on the left side of the head.
You can see the slightly different color of the precup more on the left side of the head.
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New User
Joined: Jun 2008
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haha, wow. just pulled the heads from my 6.9 and I can't wait till they look anywhere close to that clean!...almost every cylinder has THICK carbon build-up...up to 1/10 inch thick on the gaskets...and the heads look like they lost a mud fight with the pistons they're caked so thick
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Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
on both of my heads they were loose. Right or wrong, I used a small piece of paper (1/8x1/8" square) between the cup lip and cylinder head. It was just enough to get the head on and once fired up that little bit of paper just decinagrated. DO NOT use grease as this would contanimate the gasket.
New User
Joined: Jun 2008
Posts: 15
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oh i know this is over a year old but i did find a page that's got some pictures of the cup installed and removed...could be helpful to someone in the future as it was to me to figure out how to get the darn things out.
"Glow plug removal article"
some useful information about the glowplug tip problem
"Glow plug removal article"
some useful information about the glowplug tip problem
Mountain Pass
Joined: Feb 2012
Posts: 244
Likes: 0
oh i know this is over a year old but i did find a page that's got some pictures of the cup installed and removed...could be helpful to someone in the future as it was to me to figure out how to get the darn things out.
"Glow plug removal article"
some useful information about the glowplug tip problem
"Glow plug removal article"
some useful information about the glowplug tip problem
Mountain Pass
Joined: Feb 2012
Posts: 244
Likes: 0
They are interference fit. Removal and installation is done with a hammer, brass drift, and lots of care.
Once in the engine, part of the prechamber is pinched between the engine block and the head since it overlaps the fire ring. Are they actually rattling around and fall out by gravity?
Once in the engine, part of the prechamber is pinched between the engine block and the head since it overlaps the fire ring. Are they actually rattling around and fall out by gravity?
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