Andyw Posted November 24, 2012 Report Share Posted November 24, 2012 Hey everyone, I'm putting together a 73 610 goon and need some help with the vacuum lines. There really aren't too many, but I have a pair of lines for the vapor return and one capped off on the manifold that I am primarily unsure about. The car was running and driving good before, but I want to get it back to what it is supposed to be. Thanks! Andy Quote Link to comment
datzenmike Posted November 24, 2012 Report Share Posted November 24, 2012 The PCV valve is on the intake near the rear base of the carb. It will have a large rubber hose connecting it to a metal pipe coming straight out of the block which vents the crankcase fumes. There should be a much smaller rubber hose connected to the block vent pipe going over to the flow guide on the inner fender. (see (2) in the large circle in the above picture) The flow guide will also have a small hose (1) to the air filter and one to the fuel tank vent line. In operation.... when the motor is off gasoline fumes in the sealed tank accumulate and force their way into the crankcase. The fumes are prevented from going to the air cleaner by a one way valve. When the motor is started, manifold vacuum draws all fumes from the crankcase through the small metered orifice in the one way PCV valve. As the gas tank is emptied and the tank has a negative pressure, air is drawn in through the one way valve in the flow guide from the air filter. PCV valve: It is a metered air leak. The air fuel mixture is unaffected by this as the carburetor compensates for it. It has a built in one way valve so that a back-fire will not be allowed to ignite any fumes in the hoses or the crankcase. It has absolutely no effect on running or performance. It does reduce emissions but it's greatest asset is that it removes fuel and water vapor and combustion blow-by gasses inside the crankcase thereby extending oil changes and keeping the motor cleaner. Quote Link to comment
Andyw Posted November 26, 2012 Author Report Share Posted November 26, 2012 Thanks, DM! Now to figure out why I have so many air hoses coming out of the airbox... Quote Link to comment
datzenmike Posted November 26, 2012 Report Share Posted November 26, 2012 Well there will be one to the valve cover vent. A 2" flexible hose down to the exhaust manifold for warm air. A small hose from the thermostatic valve (which regulates the opening/closing of the air valve in the snorkel of the air filter) to the intake vacuum. Another small hose to the guide valve. Take a picture. Quote Link to comment
Andyw Posted December 11, 2012 Author Report Share Posted December 11, 2012 I'll check on that, and I'll take some pics if need be. What were the stock carbs for these? Quote Link to comment
datzenmike Posted December 11, 2012 Report Share Posted December 11, 2012 Hitachi DCH340-15 for 4 speed (this is the '74 probably similar for the '73) Quote Link to comment
Andyw Posted December 12, 2012 Author Report Share Posted December 12, 2012 Yup, that's what mine looks like. Early 610's only had 4 speed as an option for manual shift, right? Quote Link to comment
ProjectFeint Posted December 12, 2012 Report Share Posted December 12, 2012 Yes the "long" f4w63 4 speed Quote Link to comment
Andyw Posted December 12, 2012 Author Report Share Posted December 12, 2012 thx guys Quote Link to comment
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