Water temp sensor for cylinder head
Thread Starter
Le Mans Master
Joined: Jun 2003
Posts: 5,135
Likes: 71
From: Umeå Sweden
Water temp sensor for cylinder head
I would like to have the temp sensor on my new blueprint engine in the head, but the old sensor is to big for that, is there a one that is smaller that fits the gauge in the car?
The hole in the head is 15-16 mm, I'm bad at inches when living in Sweden
The hole in the head is 15-16 mm, I'm bad at inches when living in Sweden
Former Vendor
Joined: Aug 2006
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Drifting
Joined: Jul 2004
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From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
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St. Jude Donor '07
To keep my original sending unit with my Blueprint stroker motor, I drilled out the hole and re-tapped it with the proper 1/2" pipe threads. Easy peasey. 
Le Mans Master
Joined: Aug 2017
Posts: 8,336
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From: Cool Northern Michigan
C69 is correct about drilling the hole out. But I took my alum head to a machinist and he charged me $20 to drill and tap. I was thinking it was a 3/8 NPT? Maybe not.
Last edited by HeadsU.P.; Oct 10, 2017 at 09:29 AM.
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 65
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
Cruise-In VIII Veteran
St. Jude Donor '07
The original iron heads have a 1/2" pipe thread for the temp sender. The aftermarket aluminum heads have the 3/8" pipe thread.
Thread Starter
Le Mans Master
Joined: Jun 2003
Posts: 5,135
Likes: 71
From: Umeå Sweden
Mine is assembled so I don't want to take the head of.
But if you drill and tap I would be worried to get metal shavings inside the water channels, maybe could take the vacuum cleaner?
But if you drill and tap I would be worried to get metal shavings inside the water channels, maybe could take the vacuum cleaner?
Pro
Joined: Sep 2017
Posts: 516
Likes: 72
From: Modesto California
The few drill chips that would get into the water jackets would just find their way to the bottom of the block and stay there. Or you could use a little pocket magnet and fish them out. Better to use the 3/8" NPT sender that Wilcox sells.
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Le Mans Master
Joined: Oct 2007
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From: RI, Now Franklin/Nashville TN
This is what I did with my AFR's before the engine was assembled by me and reinstalled...I don't think I would drill and tap the heads with them already on the block...I would go with the Wilcox solution....
Pro
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