Valve Adjustment

Gertrude76 · 09-17-2009, 07:32 PM

Hello,

I'm struggling away doing my first valve adjustment (ever) on my 912 E, and I have a couple of questions.

First, I have found that articles referring to this process are a little ambiguous about what the gaps should be (.006 or .008). Hopefully someone can clear that up.

Second, some of these articles say that the intake and exhaust gaps should be different, which one is the intake and which is the exhaust.

Any help is appreciated.

Thank you in advance.

Rob Heath · 09-18-2009, 03:21 PM

Hi you may also want to search and post your 912 questions on the 912bbs.

Great group of people and source of information that have helped me a lot with my 912.

http://www.912bbs.org/index.php?a=forum&f=13

cali4sun · 09-19-2009, 12:21 AM

Hi,

912 (1976)
Intake .006
Exhaust .008

Clymer Porsche 911 & 912 1965-1978 Shop manual

'89 928S4 GP White/Black
'76 912E Silver/Black sunroof

butzip · 09-21-2009, 11:12 AM

In theory the exhaust valve will always experience more expansion due to more heat from the exhaust gases. Therefore it needs a larger gap. This applies across the board. Make sure each that for each pair of valves you are adjusting that particular cylinder is @ TDC. an easy way to do it is to pull the dist cap, set #1 to TDC and adjust that valve first then turn the crank 180 degrees then adjust the next cylinder. You can use the dist rotor to 'point' you in the right direction. Follow the spark plug wire to the cyl that the dist rotor is pointing at. This gives you a methodical way of hitting each cyl in the proper order.

09-18-2009, 03:21 PM	#2
Rob Heath Addict Rennlist Member Join Date: Jul 2006 Location: Boulder, CO Posts: 31	Hi you may also want to search and post your 912 questions on the 912bbs. Great group of people and source of information that have helped me a lot with my 912. http://www.912bbs.org/index.php?a=forum&f=13 __________________ Rob '68 912 Coupe '88 Carrera Targa

09-17-2009, 07:32 PM	#1
Gertrude76 New User Join Date: Sep 2009 Posts: 2	Valve Adjustment Hello, I'm struggling away doing my first valve adjustment (ever) on my 912 E, and I have a couple of questions. First, I have found that articles referring to this process are a little ambiguous about what the gaps should be (.006 or .008). Hopefully someone can clear that up. Second, some of these articles say that the intake and exhaust gaps should be different, which one is the intake and which is the exhaust. Any help is appreciated. Thank you in advance.

09-19-2009, 12:21 AM	#3
cali4sun User Join Date: May 2009 Location: Pismo Beach, CA Posts: 116	Hi, 912 (1976) Intake .006 Exhaust .008 Clymer Porsche 911 & 912 1965-1978 Shop manual '89 928S4 GP White/Black '76 912E Silver/Black sunroof

09-21-2009, 11:12 AM	#4
butzip Addict Rennlist Member Join Date: Nov 2005 Location: Suffield, CT Posts: 999	In theory the exhaust valve will always experience more expansion due to more heat from the exhaust gases. Therefore it needs a larger gap. This applies across the board. Make sure each that for each pair of valves you are adjusting that particular cylinder is @ TDC. an easy way to do it is to pull the dist cap, set #1 to TDC and adjust that valve first then turn the crank 180 degrees then adjust the next cylinder. You can use the dist rotor to 'point' you in the right direction. Follow the spark plug wire to the cyl that the dist rotor is pointing at. This gives you a methodical way of hitting each cyl in the proper order.