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> 1973 2.0L head question for the experts, no cylinder temp holes tapped in heads with 914 2.0L p/n
Superhawk996
post Apr 14 2019, 07:41 AM
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This falls under the category of I hate previous owners: (IMG:style_emoticons/default/chair.gif)

I knew coming into this vehicle that it was not well taken care of and has issues. That is part of the game with a 45 year old car.

This one appears to have had some real fun in its past life.

AC installed - strike 1
Cooling flaps taken out of the engine for "better cooling" - yeah right like the German's had no idea what they were doing. Strike 2

Yesterday I pulled the engine tin and it turns out Cylinder 3 isn't tapped for Cylinder Head Temp (CHT) sensor. Oh and someone welded up the breather hole. That is probably a sign of worse discoveries ahead. Other side breather was a complete cobble job of thin wall brass tube stuck in the hole and held in with RTV! (IMG:style_emoticons/default/headbang.gif)

I thought maybe the head with it tapped was put on wrong side. So I pulled the other side tin. Nope - Driver side head not machined or tapped for CHT either.


Now the plot thickens. I pull the valve covers to look at head part number. They do carry the 914 2.0L part number and they are 3 stud heads.


I'm confused.

1) Were all heads drilled for CHT or just passenger side for Cyl#3? I can't remember from my original 914 I had.
2) Are there aftermarket heads that have 914 p/n's but don't drill and tap for CHT?
3) other possibilities I'm missing?

Can add pictures later this morning.

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Mark Henry
post Apr 14 2019, 07:50 AM
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QUOTE(Superhawk996 @ Apr 14 2019, 09:41 AM) *

This falls under the category of I hate previous owners: (IMG:style_emoticons/default/chair.gif)

I knew coming into this vehicle that it was not well taken care of and has issues. That is part of the game with a 45 year old car.

This one appears to have had some real fun in its past life.

AC installed - strike 1
Cooling flaps taken out of the engine for "better cooling" - yeah right like the German's had no idea what they were doing. Strike 2

Yesterday I pulled the engine tin and it turns out Cylinder 3 isn't tapped for Cylinder Head Temp (CHT) sensor. Oh and someone welded up the breather hole. That is probably a sign of worse discoveries ahead. Other side breather was a complete cobble job of thin wall brass tube stuck in the hole and held in with RTV! (IMG:style_emoticons/default/headbang.gif)

I thought maybe the head with it tapped was put on wrong side. So I pulled the other side tin. Nope - Driver side head not machined or tapped for CHT either.


Now the plot thickens. I pull the valve covers to look at head part number. They do carry the 914 2.0L part number and they are 3 stud heads.


I'm confused.

1) Were all heads drilled for CHT or just passenger side for Cyl#3? I can't remember from my original 914 I had.
2) Are there aftermarket heads that have 914 p/n's but don't drill and tap for CHT?
3) other possibilities I'm missing?

Can add pictures later this morning.



1) Were all heads drilled for CHT or just passenger side for Cyl#3? Just the passenger side
2) Are there aftermarket heads that have 914 p/n's but don't drill and tap for CHT? not at the time this was done. Aftermarket heads won't have VW/audi logos
3) other possibilities I'm missing? the PO replaced the head with a 1/2 side head.
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Superhawk996
post Apr 14 2019, 08:41 AM
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QUOTE(Mark Henry @ Apr 14 2019, 09:50 AM) *

QUOTE(Superhawk996 @ Apr 14 2019, 09:41 AM) *

This falls under the category of I hate previous owners: (IMG:style_emoticons/default/chair.gif)

I knew coming into this vehicle that it was not well taken care of and has issues. That is part of the game with a 45 year old car.

This one appears to have had some real fun in its past life.

AC installed - strike 1
Cooling flaps taken out of the engine for "better cooling" - yeah right like the German's had no idea what they were doing. Strike 2

Yesterday I pulled the engine tin and it turns out Cylinder 3 isn't tapped for Cylinder Head Temp (CHT) sensor. Oh and someone welded up the breather hole. That is probably a sign of worse discoveries ahead. Other side breather was a complete cobble job of thin wall brass tube stuck in the hole and held in with RTV! (IMG:style_emoticons/default/headbang.gif)

I thought maybe the head with it tapped was put on wrong side. So I pulled the other side tin. Nope - Driver side head not machined or tapped for CHT either.


Now the plot thickens. I pull the valve covers to look at head part number. They do carry the 914 2.0L part number and they are 3 stud heads.


I'm confused.

1) Were all heads drilled for CHT or just passenger side for Cyl#3? I can't remember from my original 914 I had.
2) Are there aftermarket heads that have 914 p/n's but don't drill and tap for CHT?
3) other possibilities I'm missing?

Can add pictures later this morning.



1) Were all heads drilled for CHT or just passenger side for Cyl#3? Just the passenger side
2) Are there aftermarket heads that have 914 p/n's but don't drill and tap for CHT? not at the time this was done. Aftermarket heads won't have VW/audi logos
3) other possibilities I'm missing? the PO replaced the head with a 1/2 side head.



Actually option #3 is my best case scenario. That would be great news. Machining to drill and tap for CHT sensor is very doable.

Thank you so much for responding (IMG:style_emoticons/default/first.gif)

Now about that welded breather hole . . . what else did they weld . . . to be continued?
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mgphoto
post Apr 14 2019, 06:33 PM
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Tap for the hole is an odd size, the size if I remember correctly is 13 mm maybe 14 mm but the pitch is 1.0

I made the mistake of positioning the hole for 1.7 tins but I was installing 2.0 heads and tin. I will have to pull the tin if I need to change my temp sensor.
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jcd914
post Apr 14 2019, 11:18 PM
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Head temp sensor is 10mm x 1.0mm thread, not common but not too hard to find.
the hole is blind and not real deep, which makes it harder. I have or had (not sure) two 10x1.0 taps, one standard tap and one bottom tap. Start with the standard and then when it bottoms out finish with the bottom tap.

Jim
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Mark Henry
post Apr 15 2019, 07:37 AM
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QUOTE(Superhawk996 @ Apr 14 2019, 10:41 AM) *



Now about that welded breather hole . . . what else did they weld . . . to be continued?


Sure it's not JB weld?
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mgphoto
post Apr 15 2019, 08:19 AM
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QUOTE(jcd914 @ Apr 14 2019, 10:18 PM) *

Head temp sensor is 10mm x 1.0mm thread, not common but not too hard to find.
the hole is blind and not real deep, which makes it harder. I have or had (not sure) two 10x1.0 taps, one standard tap and one bottom tap. Start with the standard and then when it bottoms out finish with the bottom tap.

Jim

Thanks for the correction.
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