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> Engine failure on track day, need some help, T4 GB 2.0 head failure
CheeRS
post May 10 2019, 01:08 PM
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Hi, here is my presentation post :

http://www.914world.com/bbs2/index.php?showtopic=337989

two weeks ago I was in Monthlery near Paris France, for a wagenfest with my 914.

Get some troubles with the engine, a hammer noise and the engine stopped smoothly like out of gas.

here is what I found :
https://drive.google.com/open?id=1gzsWwNBOh...86Kbof2P4BCHHrm

some pics
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CheeRS
post May 10 2019, 01:20 PM
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my own workshop, this is a Aircooled specialized self garage


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CheeRS
post May 10 2019, 01:21 PM
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cylinder 3 admission valve stand in open position


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CheeRS
post May 10 2019, 01:29 PM
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Opening the engine and disassembling the djetronic I found somme stranges things I will like to show you

question #1 :
the head temperature sender was not plugged, perhaps I unplugged it myself by mistake.
where does it plug ?


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914_teener
post May 10 2019, 01:30 PM
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classic dropped valve seat.

Pull the heads and redo them.
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914_teener
post May 10 2019, 01:33 PM
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QUOTE(CheeRS @ May 10 2019, 12:29 PM) *

Opening the engine and disassembling the djetronic I found somme stranges things I will like to show you

question #1 :
the head temperature sender was not plugged, perhaps I unplugged it myself by mistake.
where does it plug ?



Plugs into the ecu wiring harness.
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CheeRS
post May 10 2019, 02:07 PM
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QUOTE(914_teener @ May 10 2019, 01:33 PM) *

QUOTE(CheeRS @ May 10 2019, 12:29 PM) *

Opening the engine and disassembling the djetronic I found somme stranges things I will like to show you

question #1 :
the head temperature sender was not plugged, perhaps I unplugged it myself by mistake.
where does it plug ?



Plugs into the ecu wiring harness.


I agree but where ?
here ?


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914_teener
post May 10 2019, 02:30 PM
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Follow the ecu harness back from the ECU...you should see a wire with a plastic connector shield on the end of the lead. Usually the wire is white like the one I see in the picture.
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CheeRS
post May 10 2019, 02:55 PM
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Thanks, to be sure I will track the wire and the number in the ECU connector.

Another part was not plugged, the additionnal air valve.


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GregAmy
post May 10 2019, 06:00 PM
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I'd be more worried about the dropped valve seat before where the wires plug in...but that's just me...
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bandjoey
post May 10 2019, 06:11 PM
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For a guy with that shop, I don't think he worries about wires or seats. (IMG:style_emoticons/default/first.gif)
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Chi-town
post May 10 2019, 07:02 PM
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Have the head checked for cracks before you waste time / money in machine work putting a seat back in it.

Look in the exhaust seat to the plug
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Dave_Darling
post May 10 2019, 08:46 PM
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After you look at the heads, consider the LN series heads from the Type 4 store, or if you have a good machinist locally consider getting new head castings from AMC in Spain and using them as cores.

It might make more sense to repair yours, but new castings are available.

--DD
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CheeRS
post May 11 2019, 12:42 AM
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QUOTE(GregAmy @ May 10 2019, 06:00 PM) *

I'd be more worried about the dropped valve seat before where the wires plug in...but that's just me...


Thanks friends, you are right.
I checked the head, saw no scratch, I will check again after cleaning.
Next week, I will give the head to a specialised shop
http://www.rectif2000.com/

This is why I already thinking about the engine reassembly.
Djetronic works fine but is complicated.

A pic of my selfgarage
near Paris named Atelier M8



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CheeRS
post May 11 2019, 12:43 AM
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more


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Bleyseng
post May 11 2019, 08:43 AM
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If I were you I'd order a set of new castings set up by Len at HAM for replacing those. I just did mine with a set from him including having bigger valves installed (44x38). Well worth every penny!
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rhodyguy
post May 11 2019, 08:56 AM
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Chimp Sanctuary NW. Check it out.
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Do you intend just to do the one head?
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Bleyseng
post May 11 2019, 09:57 AM
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Buy a set of these with the coating to keep the heat out of the head.


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CheeRS
post May 11 2019, 06:36 PM
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QUOTE(Bleyseng @ May 11 2019, 08:43 AM) *

If I were you I'd order a set of new castings set up by Len at HAM for replacing those. I just did mine with a set from him including having bigger valves installed (44x38). Well worth every penny!


To keep the race passport available, I need to keep the engine stock specs.
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CheeRS
post May 11 2019, 06:38 PM
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QUOTE(rhodyguy @ May 11 2019, 08:56 AM) *

Do you intend just to do the one head?


I will ask to the machining shop to check each valves, then will see.
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