I have a 97 Disco 1 (V8i). I was driving the other day and as the trip passed, there was ticking sound coming from the engine that got louder and louder as time passed. The noise was coming from the top of the engine somewhere. I noticed a vacuum hose that runs from the top part of the engine. The rectangular block on top of the engine that has the (4.0) cast into it. The hose that runs from there to the valve cover (passenger side) had collapsed. I am assuming that the hose needs to be replaced. Through further research, I understand that deals with oil distribution somehow. I ordered a PCV kit to hopefully fix the problem.
Will this ticking noise go away after I change the oil and replace PCV hoses or is this ticking sound from another potential problem?

Thank you.

chrisusvi

 

It could stay, it could go away...

biggest thing right now is to NOT DRIVE IT, until you fix it, as ticking/knocking in the engine gets worse real fast

 

You mention the upper end ticking noise getting worse while driving. Were you on the interstate at high RPM, was it stop and go traffic. How many miles on the engine? When was the oil changed?

I am assuming that you are sure that this is an upper engine noise which is typically valvetrain related (Lifters, rockers, pushrods, valves). The PCV issue won't fix the ticking noise but it is prudent to get fixed. Change oil and filter and let us know.

On the other hand, if it is lower engine noise (rod bearings, wrist pins), I would not drive it.

 

With the PCV (positive crankcase ventalation) hose clogged you are building up pressure inside the crankcase and this can cause all kinds of issues.
The PCV allows the crankcase gases to be sucked out of the crankcase and sucked into the intake plenum to be burned.