2.0 Crank & Head Venting Issues Options

[tjtryon]

Car: 1973 2.0 with dual Webbers

Issue: I have a leak from the drivers side valve cover, and poking around, I know my crank & head venting is not correct, which may be what's causing issues. I wanted to fix this first, before I change the valve cover gasket.

I have what I believe is the CB breather box already on the car. It has a hose connected to the oil filler area, one to the fan shroud, and one that is venting to atmosphere.

I have a hose port at the base of the carb intake manifold on both sides, that does seem to vent air out. I assume these are the head or valve cover vents, but am not sure. Additionally, nothing in the system seems to pull vaccuum, unless the fan shroud vent does so.

I have 3 main questions: What are the hose ports at the base of the carb intakes (front of intake on drivers side, rear of intake on passengers side)? What's the correct routing of the hoses? Where does the system pull a vaccuum?

Many thanks in advance!

[Spoke]

This thread is very timely for me. I just installed a 2056 with dual carbs. I have the passenger side head vented only through a filter and the driver side head and chimney vented together through another filter. No catch can is used at this time.

I have 2 issues:

1) The passenger side head vent is dripping oil on the engine and making a hell of a mess on top of the engine and below it. Very little oil is coming out of the driver side head + chimney vents.

2) Gasses from the filters from the crankcase are being sucked back into the cooling fan and eventually into the interior when cabin heat is on. I've mounted the filters next to the carb filters to try to get the gasses to be sucked back into the intakes. Positioning the filters next to the carb intakes work ok when the throttle is open. When the throttle is closed on deaccel, I get very noticeable vented burnt oil odor in the interior.

I'm looking to solve both issues.

From Len's and Jake's findings, it sounds like I can connect both head vents together with a straight hose. Then add a filter to the chimney. Should the chimney filter also include a catch can? The chimney filter should then vent the crankcase gasses back into the carb filters to keep the gasses from entering the cabin during heating season (about 1/2 the year here in PA).

Comments? TIA

[HAM Inc]

This thread is very timely for me. I just installed a 2056 with dual carbs. I have the passenger side head vented only through a filter and the driver side head and chimney vented together through another filter. No catch can is used at this time.

I have 2 issues:

1) The passenger side head vent is dripping oil on the engine and making a hell of a mess on top of the engine and below it. Very little oil is coming out of the driver side head + chimney vents.

2) Gasses from the filters from the crankcase are being sucked back into the cooling fan and eventually into the interior when cabin heat is on. I've mounted the filters next to the carb filters to try to get the gasses to be sucked back into the intakes. Positioning the filters next to the carb intakes work ok when the throttle is open. When the throttle is closed on deaccel, I get very noticeable vented burnt oil odor in the interior.

I'm looking to solve both issues.

From Len's and Jake's findings, it sounds like I can connect both head vents together with a straight hose. Then add a filter to the chimney. Should the chimney filter also include a catch can? The chimney filter should then vent the crankcase gasses back into the carb filters to keep the gasses from entering the cabin during heating season (about 1/2 the year here in PA).

Comments? TIA

Sounds like your factory vent tubes are loose. They're very thin wall aluminum tubes that are just pressed into the heads. It's very common for them to come lose. It's also common for them to crimp and/or bend when hoses are installed and hoseclamps over tightened.

The tubes will usually come out without a fight. You might be able to pull yours out with the hose. Leave the hose tight on the fitting and yank it.

The opening in the head can be easily tapped for 1/4" npt fitting with no drilling required. Then you can install hose barbs if you want to stay with vents, or just install pipe plugs if not.