Forums/Z31P/z31-repairs-forums engine-mechanical/Huge Ticking when Hot idle
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z31xac: (2017-06-01 03:00:35)
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)
Z_Karma: (2017-06-01 03:21:06)
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.
shromy: (2017-06-01 12:43:04)
id be willing to bet a lifter has collapsed
.
z31xac: (2017-06-01 18:34:47)
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.
NissanEgg: (2017-06-01 18:58:33)
Sounds like a weak and collapsed lifter. Only issue is determining exactly which one is making the noise.
z31xac: (2017-06-02 00:38:58)
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
It is more like if you throw some small bolts in valve cover and hear them rattling around..
Zuphoria: (2017-06-02 12:55:04)
Can you post a Video?
z31xac: (2017-06-03 19:47:58)
At 00:30
https://www.youtube.com/watch?v=HOrpvcwJfSI
Pressure when cold at 30lb, 15 when hot.
Noise only when hot and idle.