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Plugged too deep thermistor hole in head?
Posted by: kcjengr ()
Date: November 04, 2018 07:15PM

While cleaning up the cylinder heads for my '64 110hp engine I found what looks to be
a plugged hole that comes thru the gasket seat area. It appears to be in line with
the thermistor hole. The material it's plugged with seems like a hard lead alloy.

Is this normal?



Thanks!

--
Kurt J.
Atlanta, Ga
'64 Monza Coupe 110hp 4spd
Restoration in progress here
Photo album here

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Re: Plugged too deep thermistor hole in head?
Posted by: steve c goodman ()
Date: November 04, 2018 07:23PM

Someone tried to drill deep enough for a thermistor.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Plugged too deep thermistor hole in head?
Posted by: MattNall ()
Date: November 04, 2018 07:27PM

If it works... keep driving... I drove an engine 13k miles with a bad TM sticking into the head... never pinged!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Plugged too deep thermistor hole in head?
Posted by: kcjengr ()
Date: November 04, 2018 08:28PM

Aha, so the stock hole in the 110 heads is for a temp SWITCH, so is not deep enough for a thermistor,
hence somebody trying to drill it deeper. I guess the threads are also different for the thermistor.

They must have hired a rat to gnaw that hole, LOL


I'm starting to understand why the heads were switched on the parts engine this head came off ...

Guess I should pull the other head and see if it is in any better shape.

Thanks Steve and Matt.

--
Kurt J.
Atlanta, Ga
'64 Monza Coupe 110hp 4spd
Restoration in progress here
Photo album here

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Re: Plugged too deep thermistor hole in head?
Posted by: MattNall ()
Date: November 04, 2018 08:29PM

Correct... Swich is 3/8-16

Thermister is 24





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Plugged too deep thermistor hole in head?
Posted by: vairmech ()
Date: November 05, 2018 05:09AM

steve c goodman Wrote:
-------------------------------------------------------
> Someone tried to drill deep enough for a
> thermistor.
>>>>>>>>>>>>>>>>>>>>>>>>>

Yup, What Steve said!

I have said many times here that you cannot just drill into a head to put a thermistor in, it will break into the combustion chamber as you see in the picture above. If you want a thermistor in anything but a turbo or 140 head you need an adapter to add length. The turbo and 140 heads have the boss moved so the thermistor can be at the top center of the combustion chamber, the hottest spot of the head.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Plugged too deep thermistor hole in head?
Posted by: jjohnsonjo ()
Date: November 05, 2018 07:03AM

Or drill a completely drill and tap a new hole just beneath the original, which I have done a few times. Or use the adapter which I have also done. No matter which way you go it will read a little lower than the factory position.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
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2010 BMW F 650 GS
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2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
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