Editing Forums/Z31P/z31-repairs-forums engine-mechanical/Huge Ticking when Hot idle

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|op_user=z31xac
|op_date=2017-06-01 03:00:35
|post_count=8
|archive_url=/Z31performance_archive/forum/z31-repairs-forums/engine-mechanical/535925-huge-ticking-when-hot-idle.html
}}

'''z31xac:''' <small>(2017-06-01 03:00:35)</small>

Hi, I always had the normal lifter ticking at startup when cold for 2-3 seconds but now when I'm back from a ride I got a huge tick that really sound like crap at idle (like a diesel truck) (not the startup sound). The noise stops at 1000 RPM. It's not the injectors ! I hear them at 1000RPM… the rattle is 5 times louder. Oil Pressure at 2kg on highway (30lb on US gauge), 15lb minimum. Using 10w30 high mileage. I'm really not planning repair (job, kids..). What oil / additive could I use to help if possible. Engine is 291 000 KMs, did run on fresh oil for the last 22 years ! (87NA)

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'''Z_Karma:''' <small>(2017-06-01 03:21:06)</small>

Are you sure it's not an exhaust leak due to a busted manifold stud, or cracked manifold.? They can sometimes tick and mimic a lifter noise.

You could try and run some SeaFoam additive in the oil just before a oil change to help dissolve any gunk in the lifters.

However the side effect of doing this means that you may be dissolving anything that is keeping a already weak seal from sealing anymore.

Disclaimer, i've not done this myself, i get a startup tick that goes away pretty quickly.

If the solvent helps, you might consider switching to synthetic oil if you haven't already done so.

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'''shromy:''' <small>(2017-06-01 12:43:04)</small>

id be willing to bet a lifter has collapsed

.

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'''z31xac:''' <small>(2017-06-01 18:34:47)</small>

{{Quote|user=shromy|id be willing to bet a lifter has collapsed

.}}

The car would run bad right ? car seems fine.

Also I had a cracked manifold (driver) welded for a while and leaks but it was not making that sound.

Thanks.

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'''NissanEgg:''' <small>(2017-06-01 18:58:33)</small>

Sounds like a weak and collapsed lifter. Only issue is determining exactly which one is making the noise.

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'''z31xac:''' <small>(2017-06-02 00:38:58)</small>

So that could possibly damage the engine right ? Is it something we see often on these engine (total fail/damage) ? (Because I can live with the noise).

By the way it is NOT that noise:

[https://www.youtube.com/watch?v=c2T7yUPW2T0 https://www.youtube.com/watch?v=c2T7yUPW2T0]

It is more like if you throw some small bolts in valve cover and hear them rattling around..

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'''Zuphoria:''' <small>(2017-06-02 12:55:04)</small>

Can you post a Video?

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'''z31xac:''' <small>(2017-06-03 19:47:58)</small>

At 00:30

[https://www.youtube.com/watch?v=HOrpvcwJfSI https://www.youtube.com/watch?v=HOrpvcwJfSI]

Pressure when cold at 30lb, 15 when hot.

Noise only when hot and idle.