What are these two holes on the heads?

[magdelyn]

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http://fauxwhore.com

1973 vw super beetle
1988 Jetta
2001 Jetta
1959 beetle, ragtop sunroof
1973 bus westfalia (presently owned)
1967 squareback custom (just bought 04/11/2015)

[ac78]

Left one is temp II sensor for fuel injection. The right is a tin screw but the tin has been cut around it.
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78 Westy 2.0l hydr. FI

VW Campmobile
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[magdelyn]

[Wildthings]

You don't need to plug them but you do want to put fasteners in them to hold the tin tight against the head. The left one is a 10x1mm thread which you may find in a drawer at your local hardware. An old TSII sensor will work as well.

A standard M6 bolt with work for the right hole with a fender washer large enough to span the cutout in the tin. You may need to saw or grind off a bit of one edge of your washer to get clearance.

You need to find something to plug that big unused hole in your tin as well as it will waste a ton of cooling air if left open.

[Bleyseng]

That big old hole is from a early oem temp sensor 2 location and you can buy the rubber piece that fits it.
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70 Ghia Black convert-9/69 build date-stock w/133k 1600 SP-barn find now with a rebuilt tranny and engine
77 Westy 2.0L w/Ljet, Camper Special engine-95hp and with LSD!(sold)
76 Porsche 914 2.1L L20c, 120hp Djet (sold)
87 Syncro Westy Titan Red 2.1L 2 knob 100k miles

[busdaddy]

I wonder if an electrical knockout plug would fit there?, those rubber plugs die an early death from the heat, steel would last forever.
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[magdelyn]

If I were to buy that sensor, like the one near the number three cylinder, could I convert it to use as a temperature gauge?
_________________
http://fauxwhore.com

1973 vw super beetle
1988 Jetta
2001 Jetta
1959 beetle, ragtop sunroof
1973 bus westfalia (presently owned)
1967 squareback custom (just bought 04/11/2015)

[busdaddy]

Not really, yes it would show a rough idea of the temperature of that part of the head, but it wouldn't react fast and may never show what's happening at the combustion chamber where the action happens. It was just to tell the computer when the engine was warmed up, it won't provide a second by second account of when potential damage may happen.

1/8" NPT pipe fittings (like plugs for example) are really close to M10X1.0 and will thread in as well. Or use the male end of an old brake line, they are the correct thread and have a stepped up area you could put a washer under.
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Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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[magdelyn]

Thanks again, everybody for the awesome insights.
_________________
http://fauxwhore.com

1973 vw super beetle
1988 Jetta
2001 Jetta
1959 beetle, ragtop sunroof
1973 bus westfalia (presently owned)
1967 squareback custom (just bought 04/11/2015)

[Vanapplebomb]

[Hoody]

Edit

[Hoody]

Or you could buy a correct stainless plug from Belmetric and not eff up the threads in your head. For very short money. Search drain plugs on their site. The Spanish heads have the temp sensor 2 hole drilled out on both sides. So you just need to plug the one side. Use copper anti seize on the plugged side. The head gets way to hot for rubber and the tin needs to be tight. The one you want uses a hex wench. It's the same thread pitch as the tempS2 with a wide head. If you can't locate it on their site. I can send you the link.

[udidwht]

At the very least plug them or else you'll have popping on high decel situations. Won't be detrimental but annoying.
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1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
Headflow Masters New AMC 42x36mm heads w/Porsche swivel adjusters
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73 Web Cam w/Web solids
Dual 40mm IDF Webers - LM-2 - 47.5 idles/125 mains/190 air corr./F11 tubes/28mm Vents - Float height 10.45mm/Drop 32mm
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Bosch W8CC plugs
Pertronix Flamethrower 40K coil
S&S 4-1 w/Walker QP 17862
3 rib 002 Trans
185R14 Hankook tires

[SGKent]

[udidwht]

[SGKent]

[Wildthings]

[old DKP driver]

There are many that do not want to concede their mistakes when it comes to holes in their head"s
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V.W.owner since 1967