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PostPosted: Sun Dec 03, 2017 4:39 pm 
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Joined: Fri Dec 23, 2016 7:11 am
Posts: 248
Howie, before going to crazy I think you should consider removing the accessory drive belt (s), and then run it (briefly, in the driveway) to see if your noise is still present.

If it's not than the noise is coming from one of your accessories. You can isolate from there, you said you replaced those belts too right?

If the noise is the same with no accessory belts than I'd consider the timing belt or tension.

Hope that helps.

Jay


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PostPosted: Mon Dec 04, 2017 5:42 pm 
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Joined: Fri Dec 25, 2015 7:39 pm
Posts: 442
Location: Long Island, N.Y.
Thanks Jay for your thoughts. That's the beauty of this forum.... members giving their thoughts and ideas for solutions to problems and answering questions.

The front of the engine is coming apart again to put in a new timing belt tensioner. Keeping my finger crossed.

Howard

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1985 300ZX- GLL Dark Pewter Metallic - Survivor


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PostPosted: Mon Dec 04, 2017 8:03 pm 
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Joined: Fri Dec 23, 2016 7:11 am
Posts: 248
You're welcome Howard, I hope the repair goes smoothly for you.

Jay


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PostPosted: Fri Jan 05, 2018 7:12 pm 
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Joined: Fri Dec 25, 2015 7:39 pm
Posts: 442
Location: Long Island, N.Y.
As a precaution, due diligence and "What the hell" maneuver, a new OEM tensioner and a new OEM water pump were installed since they hadn't been changed for over 23 years. Turns out, the mechanic found that the water pump seal was making the "bearing/whining" noise.
I didn't quite understand what he meant by that because I always thought of a seal as a device that's made of metal and rubber, round, and is static after being pressure fitted into place. He commented that when he manually rotated it he could hear that it was noisy, and replaced it.

Bottom line... the engine is running smooth and quiet just like it always did. In addition I was told that the old timing belt slid off the gears WITHOUT having to back off the screw on the belt tensioner :shock: and that the belt could have slipped off at any time, doing major engine damage.

I am very thankful that I'm no longer playing Russian roulette driving my work of art. I'm looking forward to the upcoming Z events of 2018.

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1985 300ZX- GLL Dark Pewter Metallic - Survivor


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PostPosted: Fri Jan 05, 2018 7:55 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12809
Location: CT
:shock: Duuuuude.....your intuition just saved you an engine.

You are EXACTLY the man to walk Point.

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1970 240Z


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PostPosted: Fri Jan 05, 2018 9:29 pm 
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Joined: Mon Jun 30, 2008 2:16 pm
Posts: 356
Location: Ansonia, CT
Good catch on the belt and water pump Howie! :thumbs_up:

I never liked the idea of timing belts. I realize they are quieter than a chain and maybe even save weight, but the potential for huge engine damage if the belt fails is just too great in my simple mind. It's one of the features of the old L24 that endears me to my old Z, a dual chain driven cam. :wink:

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John Kish
1971 240Z original owner


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PostPosted: Sat Jan 06, 2018 10:05 am 
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Joined: Fri Dec 25, 2015 7:39 pm
Posts: 442
Location: Long Island, N.Y.
Frank T wrote:
:shock: Duuuuude.....your intuition just saved you an engine.

You are EXACTLY the man to walk Point.


Thanks Frank, but I'll take two steps back on taking Point. Lol. :mrgreen: 8)

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1985 300ZX- GLL Dark Pewter Metallic - Survivor


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