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Oil Change Destroys Nissan Altima??

Q. A few days ago, a clicking noise developed under the hood, at the time I was uncertain where it was coming from. Yesterday I changed my oil and filter, and upon starting the car again, the clicking noise sounded more like a rattling noise, the engine was idling very rough and any acceleration made it hesitate.

Oil Change Destroys Nissan Altima??

In removing the oil fill cap, not only was the rattling heard better but one could feel "wind" blowing out of the oil fill hole, the engine idled even rougher when the oil fill cap was off. I installed new spark plugs but the problem wasn't reduced. This morning, the car idled even rougher, finally just breaking down. The engine could be started but then it stalls within five seconds.

I really don't think that the oil change had anything to do with this breakdown. It was probably just a coincidence, as there was some noise heard before the oil change indicating that something was wrong.

I read elsewhere that it could be the timing chain tensioner side guide. A Nissan Technical Service Bulletin (NTB 98055) on Nov 1988 on "Engine - Timing Chain Noise" for the 1996's shows the abstract below. I read elsewhere the guides tend to break and ride around on the chain.

It is an 1996 Nissan Altima GXE with 131,000 miles. The amber "Check Engine Light" was on for a few months, but a code analysis indicated that it was only a knock sensor and O2 sensor malfunction. I don't think that temporarily ignoring these sensor malfunctions for a few months contributed to the problem, but I could be wrong. The red "Check Oil" light never came on, which I assume means that the oil level wasn't low and there wasn't an oil pressure problem.

I believe I have the DOHC KA24DE engine as opposed to the SOHC KA24E as shown with good photos here SOHC KA24E Is the timing off here? Are things majorly messed up, like bent valves or something else?

Again, the car starts but then stalls. Is this what the "blow by" coming out of the oil fill hole indicates, gasses blowing from the cylinders past damaged valves? If I just installed a tensioner side guide, could this solve the problem? What more might be necessary? Where does one get this tensioner side guide from? A general parts store, dealer, or other? I was wondering if it was worth trying to fix, if not much damage was done. Is it normal for air/gasses to blow-by through the oil fill hole?

From a Nissan TSB: Engine - Timing Chain Noise "If a 1993-98 Altima exhibits excessive timing chain noise, the cause may be a broken tension-side timing chain guide on the lower timing chain. A new, metal-backed tension-side timing chain guide is available to resolve this incident. For any reason whenever this guide is replaced, use the new C/M parts listed on page 3. The new guide along with the two bolts that secure it must be installed as a set."

A. Yes, it's true that Nissan had a problem with the tension side timing chain guide breaking. But it didn't usually result in engine damage. When they broke and started making noise, people brought them in to be repaired. And when it was slow, we brought in new vehicles with that engine and replaced them before they were sold.

It is possible for the guide to break and have it result in bent valves, but that would not cause the blowby you are experiencing or the stalling. In fact, the engine would probably not run at all with bent valves and broken timing chain.

The blowby is from worn out piston rings. Low compression would make the engine run rough and when you remove the oil cap, run rougher. By taking the oil cap, or oil dipstick, off you allow unmetered air to enter the engine. The Air Flow Meter doesn't know about this air and as a result you get a leaner fuel mixture.

Oil Change Destroys Nissan Altima??

I don't know if you can get the tension side chain guide from an aftermarket source, but here is the part numbers for the Nissan parts.

DESCRIPTION PART NUMBER QUANTITY
Guide, chain, tension side 13085-1E4O1 1
Bolt, hex 13075-40F20 2

Additional Information provided courtesy of AllDATA

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