Freeze plug help!
I have 10mm, 3/8", and 5/16" hex heads and none of them fit the small freeze plugs on the driver's side of the block or the oil passage plugs. The 5/16" was the only one that went in but was too loose. The 10mm was too big.
So, I figure they are 9mm?
So, I figure they are 9mm?
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Ran into similar issue this weekend. Being a Datsun Z car shop, I have a decent selection of metric hardware on hand, so I found a bolt with the right sized head for the large brass core plug/block coolant drain.
Turns out it is 17mm as pointed out above. Found 10mmx1.25mm bolt with a 17mm head, then wanting a little more “engagement” with the soft brass, I added my last 10mmx1.25mm nut that takes a 17mm wrench, ran it up tight to the bolt, clocked the flats in phase and welded it to the bolt. I then took another 10mmx1.25 nut, this one takes a 14mm wrench, welded that on the end of the bolt. With this totally bubba, uber ugly “tool”, I was able to remove that stubborn brass plug. The block drain for the other bank takes an 8mm allen, already have one of those for a 3/8” ratchet.
Monday went down to Sears and bought a 17mm allen wrench. Will be cutting a length off of it and tacking that into a ½” drive 17mm socket for a dedicated LSx block drain tool.
Turns out it is 17mm as pointed out above. Found 10mmx1.25mm bolt with a 17mm head, then wanting a little more “engagement” with the soft brass, I added my last 10mmx1.25mm nut that takes a 17mm wrench, ran it up tight to the bolt, clocked the flats in phase and welded it to the bolt. I then took another 10mmx1.25 nut, this one takes a 14mm wrench, welded that on the end of the bolt. With this totally bubba, uber ugly “tool”, I was able to remove that stubborn brass plug. The block drain for the other bank takes an 8mm allen, already have one of those for a 3/8” ratchet.
Monday went down to Sears and bought a 17mm allen wrench. Will be cutting a length off of it and tacking that into a ½” drive 17mm socket for a dedicated LSx block drain tool.
Thanks BRAAPZ. 8mm and 17mm 
. I just ordered a Hex socket set from Harbor Freight with I think 8,9,10,12,14,17mm Hex, 7,8,11,13 square and 5/16 and 3/8 square heads.
Link:
http://www.harborfreight.com/cpi/cta...emnumber=94961
. I just ordered a Hex socket set from Harbor Freight with I think 8,9,10,12,14,17mm Hex, 7,8,11,13 square and 5/16 and 3/8 square heads.Link:
http://www.harborfreight.com/cpi/cta...emnumber=94961
Last edited by 1CAMWNDR; Mar 3, 2009 at 11:27 AM.
Possibly. The 2 I took out are the big one behind the alternator that takes a big 17mm allen wrench and the small one above the starter that takes a T50 torx. I stole these pics from another thread:
Last edited by HavATampa; May 31, 2011 at 10:15 PM.
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