Unknown Object

Bill UK · 09-21-2006, 07:51 PM

Not sure what this is at the bottom of the hole, checked the parts catalogue the nearest I can see it being is a union for cylinder head. What does it do? as you can see its almost looks like a ball bearing.

Location: inlet side of cylinder head at the very front.

mrnickleye · 09-22-2006, 12:54 AM

I believe it is a machining hole use during manufacture of the head. Thats why they plugged it off, as it is no longer needed.

Bill UK · 09-22-2006, 09:44 PM

Seams odd Mr Nickleye Toyota never blocked it off with a large grub screw like they did with the oil gallery at the front and rear of the block.

mrnickleye · 09-23-2006, 12:42 AM

I suspect the hole that has a threaded plug in it had something threaded into it at the factory. Why else to spend $$$ threading it??

While the other hole was simply a drilled hole to access a galley, or tie in 2 passages.

Machining blocks is a complicated affair. And then imagine an assembly line. So they have to do it as efficiently and quickly as possible.

suprra_girl · 10-01-2006, 05:14 AM

they probably threaded the oil galleries to make for easier cleaning of the galleries when taken to a reconditioner

09-21-2006, 07:51 PM	#1
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Unknown Object Not sure what this is at the bottom of the hole, checked the parts catalogue the nearest I can see it being is a union for cylinder head. What does it do? as you can see its almost looks like a ball bearing. Location: inlet side of cylinder head at the very front.

09-22-2006, 12:54 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	I believe it is a machining hole use during manufacture of the head. Thats why they plugged it off, as it is no longer needed. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

09-23-2006, 12:42 AM	#4
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	I suspect the hole that has a threaded plug in it had something threaded into it at the factory. Why else to spend $$$ threading it?? While the other hole was simply a drilled hole to access a galley, or tie in 2 passages. Machining blocks is a complicated affair. And then imagine an assembly line. So they have to do it as efficiently and quickly as possible. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08. Last edited by mrnickleye; 09-23-2006 at 12:46 AM.

10-01-2006, 05:14 AM	#5
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	they probably threaded the oil galleries to make for easier cleaning of the galleries when taken to a reconditioner __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

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09-22-2006, 09:44 PM	#3
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Seams odd Mr Nickleye Toyota never blocked it off with a large grub screw like they did with the oil gallery at the front and rear of the block.