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 Post subject: New timing Belt (+)...
PostPosted: Tue Nov 28, 2017 7:07 pm 
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Joined: Fri Dec 25, 2015 7:39 pm
Posts: 535
Location: Long Island, N.Y.
Well.... I've bitten the proverbial bullet and changed the TB (very hard on dentures). :lol:. With only 35,000 original miles the 1985 Z had timing belt #2 installed. The first one was changed in 1994 when the car had 29,000 miles and now, 23 years later, and 6,000 additional miles I thought it was a wise decision to change the TB again along with the cam seals and drive belts. Things went well with no dents, scratches or breakage of any body or engine parts. 8) :D Yeah!!!

The 20 mile ride (shake down cruise) was, as always, fun fun fun. The next day I decided to prep the car for the chilly days ahead by topping off the gas tank and adding some Stabil. While backing the car into the garage I thought I heard a whining sound from the engine bay. I popped the hood but everything was nice and quiet until I throttled up to 1,300rpm. It sounds like a turbo whine (I don't have one of those), or an over tightened belt causing the alternator bearings to whir/complain (belt deflection of drive belts meet mfg. specs perfectly). :? The sound increased up to 1,800rpm, before it was no longer audible. My well qualified, Z loving, meticulous mechanic assures me that the TB tensioner specs are also spot on.

He (and I tend to agree) thinks that it might just be all the new belts having to be given appropriate time to properly seat themselves. The whirring sound isn't heard above 1,800rpm or below 1,300rpm. :o We decided the I should put on about 40-60 more miles on Z car to see if the sound stays the same, goes away or gets worse. If need be he said he'd back off the tensioner (below specs) if the noise doesn't go away. (F.Y.I.- He said that the old TB slid right off the sprockets without having to touch the belt tensioner). Yikes! Scary, too. :shock: :shock: :shock: Will definitely do what has to be done. Just another excuse to run through all them gears. 8) :mrgreen: :D

Has anyone else had this issue before? If so, was it resolved? Is this "normal" when the belts are changed? And "No." - Frank, I won't let you take it off my hands. Lol. :P :lol:

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1985 300ZX- GLL Dark Pewter Metallic - Survivor


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PostPosted: Wed Nov 29, 2017 12:46 am 
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Location: CT
How extremely odd ~ I *just* signed-in to ask you if you ever decided to change your timing belt!!! :lol: That's just weird!

OK, so I already know what your problem is. The timing belt you bought was made during the summer (daylight savings time) and you used it now, during the winter (daylight standard time). You've got the wrong 'time' on the belt and it will always skweel like that until next May when we spring ahead again. Your mechanic should have known this and I'm surpriZed he unloaded an untimed timing belt on you when you weren't looking. There is no way to adjust the time on these belts that I know of, so I'm sorry to say you're stuck with it. HOWEVER, because I'm your Bud and don't want you to fret about this all winter, I will buy your old car from you. Meet me this weekend and bring the keys and the title.

in the meantime, see if it makes the same squeal when you depress the clutch pedal.

Your buddy,
Frank T

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PostPosted: Wed Nov 29, 2017 10:59 am 
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Joined: Mon Jun 30, 2008 2:16 pm
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Location: Ansonia, CT
:shock:
Wow!

Good to know this Frank.

Does the same hold true if you are planning to replace the timing chain on a 240Z? :?

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John Kish
1971 240Z original owner


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PostPosted: Wed Nov 29, 2017 11:09 am 
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Location: Somers CT
It only matters if you try to set it differently then the way it was installed when it was originally built ! !
Just replace it the same time of year and you should be good John. :wink:

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W.Karl Walton
Somers CT



75' - 280Z - HLS30203249 - #304 Gold Metallic (stockish)
96' - 300zx TT - JN1CZ24d3TX960293 - Black on Black (enhanced)


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PostPosted: Wed Nov 29, 2017 11:15 am 
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That depends on what time zone you're in, John. If you bought a chain out west but installed it back east, you might have to advance or retard the timing twice each year. If you, here on the Rust Coast, bought and installed a NOS chain all the way from Japan, you almost certainly would encounter the dreaded Time Warp Dislocation phenomenon, wherein your Z engine's timing could be an entire day off. This is more common than you might suspect, and is the exact reason so few classic Z dash clocks work anymore.

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PostPosted: Wed Nov 29, 2017 3:02 pm 
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Good to know that Frank . . . . since my clock works fine I can now rest assured my timing is still good ! ! :mrgreen: :thumbs_up:

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W.Karl Walton
Somers CT



75' - 280Z - HLS30203249 - #304 Gold Metallic (stockish)
96' - 300zx TT - JN1CZ24d3TX960293 - Black on Black (enhanced)


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PostPosted: Wed Nov 29, 2017 4:34 pm 
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Joined: Fri Dec 25, 2015 7:39 pm
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Location: Long Island, N.Y.
Thanks guys for all that useful information. It makes me feel so much better, now that my engine noise concerns have been put to rest (buried).

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Last edited by HowardJ on Wed Nov 29, 2017 5:49 pm, edited 1 time in total.

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PostPosted: Wed Nov 29, 2017 5:05 pm 
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Image

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W.Karl Walton
Somers CT



75' - 280Z - HLS30203249 - #304 Gold Metallic (stockish)
96' - 300zx TT - JN1CZ24d3TX960293 - Black on Black (enhanced)


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PostPosted: Wed Nov 29, 2017 9:45 pm 
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:lol:

Seriously Howie, sit in the car at idle and slowly depress the clutch. See if the squeal changes or goes away. Throwout bearings make weird little noises when they want attention. Also, the alternator or tensioner might be singing.

Don't forget the old shadetree trick we used for new belts as kids; rub a bar of hand soap along the inside surface of the new belt to reduce squeals. NOT when the engine is running, tho.

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PostPosted: Wed Nov 29, 2017 11:47 pm 
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Location: Long Island, N.Y.
It's an alternator "type" whine that I'm hearing and not really a squeal that occurs between 1200 & 1800rpm but not at idle and doesn't go away even if the clutch is being depressed. Since I didn't have this noise before the new TB I'm going to presume (not assume) that it's being caused by the belt tensioner needing to be backed off a smidge. Or maybe it's the tensioner itself? Not sure. Now I have to decide if I'll have my mechanic redo a 3 hour disassembly to readjust the belt tension or just pray to the Z gods that the belt will seat and stretch like it's supposed to. Grrr. :evil:

I'll definitely try the old soap on the drive belt trick. :thumbs_up: Ivory or Dove? :shock: :wink: Good thought. Yes, one at a time. I'll also try the pipe stethoscope on the alternator trick. Thanks. :)

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PostPosted: Thu Nov 30, 2017 7:58 am 
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When was the alternator changed last from your description it could be the bearing in the alternator a well.

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W.Karl Walton
Somers CT



75' - 280Z - HLS30203249 - #304 Gold Metallic (stockish)
96' - 300zx TT - JN1CZ24d3TX960293 - Black on Black (enhanced)


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PostPosted: Thu Nov 30, 2017 9:57 am 
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I'll be stethoscoping the alternator/bearings today. Thanks.

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PostPosted: Thu Nov 30, 2017 10:00 am 
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Joined: Wed Apr 09, 2008 5:53 pm
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Well, altho "old", Howie's zx has fairly few miles, so I would tend to suspect the whirring noise might come from either the high speed muffler bearings or one of the torsion equilibrium chambers being dirtier than the others. Open the hood, the doors and the hatch and drive it slowly thru the carwash twice. I'll bet you don't even notice the little noise at the end of that. Take a female along to help keep the car balanced level and to give you input as you go. 8)

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PostPosted: Thu Nov 30, 2017 12:57 pm 
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FM6 wrote:
When was the alternator changed last from your description it could be the bearing in the alternator a well.


October 11,1984. - Japan :) :)

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PostPosted: Thu Nov 30, 2017 1:59 pm 
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when you're poking around with your stethoscope stick, poke near the power steering pump.

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