[cyoung24]

Inline six tech help. 200 cu.in. '67

This problem may have been encountered with other engine types.
Problem: after driving at highway speeds over a twenty-thirty minute interval, I begin to hear valves ticking (loud), and water temp will peg. Slowing and letting the temp come back to normal quietens the lifter/valve tick. Going back up to speed sees ticking go away and temp back to normal for another short while. Then it repeats. Oil is being seen in the air filter (AF) housing after these occurances, apparently blown in through the valve cover filter that is connected to the AF housing. Oil pressure remains high and constant during these times.

I pulled the oil pan, pick-up tube screen is clear, flushed tube: no restrictions were apparent. The oil appears to fill up in the valve cover and not drain back adequately.

Appreciate any assistance

[Jay H 237]

Not really sure about this without really looking at it but have you checked the PCV valve to make sure it's working and not building up pressure in the crankcase and forcing it out into the air cleaner? If you say it appears the oil isn't drianing back down fast enough I'd pull the valve cover and check the return holes that they're not plugged with anything.

Those are the two things I can think of off hand since it maintains pressure no matter what so it appears the pump is working fine.

[The Greek]

I agree with the previous post about the PCV. The engine over heating problem may be caused by a collapsing lower radiator hose when driving at sustained highway speeds. There should be a spring inside the lower hose to prevent this from happening. Some cheaper hoses don't come with them. Find a hose that has the spring and most likely your over heating problem will be solved. NAPA may have the hose with the spring. All the best,-Chuck

[cyoung24]

Appreciate the suggestions. I did check to relief holes and they appear to be unrestricted. As a matter of checking, I removed the valve cover and poured the last quart in at idle during the last oil change.

I thought maybe the overheating was a product of losing the oil's cooling effect as it drains back into the pan. Collapsed hose is an area I'll check.

[cyoung24]

Good suggestion for the PVC. i will try and elbow into the PVC gromet and dtermine if problem might lie there. PV rattles when shaken.

[cyoung24]

'68 coupe uilt over the course of about 10 months. Pictured at the SAAC 31 on VIR's racetrack

[cyoung24]

Still needing suggestions. Anyone else run into this problem before?

[cyoung24]

Comments to this thread caused me to think back to when oiling problem began. It was after the valve cover gasket was replaced and the nasty PVC hose to the manifold was replaced with fuel line. I have since replumbed the system with steel line used 1'-1.5 inch pieces of fuel line to couple the steel line to PVS valve and manifold (metal to metal) and ...problem solved. the PVC replacement hose was collapsing under high manifold pressure creating an inability to relieve crankcase pressure, oil got hung up in the valve cover causing the car to overheat and lifters to tick due to oil starvation. Amazing how much heat the oil pulls from the block.

Thanks again for your comments

Cyoung24