TwinTurbo.NET: Nissan 300ZX forum - Well it's definitely RPM related. It does concern me that
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Subject Well it's definitely RPM related. It does concern me that
     
Posted by jzack on September 17, 2017 at 12:42 PM
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In Reply To Engine whine posted by infoschumi on September 17, 2017 at 04:35 AM
     
Message when the timing belt was installed the belt tensioner wasn't set to the right 4mm gap spacing. That's actually pretty important. Here's what I would do:

Get an auto stethoscope or just a short length of garden hose and rule out the whine isn't from the AC compressor, alternator or power steering pump. Garden hose makes it easier to localize engine bay sounds - just be careful since the engine will be running. FYI - I've duct taped the garden hose end to a 3/8 long wood dowl. Makes moving the hose end around a lot easier and safer than sticking your hand next to moving parts.

Pull off the driver side t-belt cover and inspect the belt for wear or fraying. Some folks install the crank t-belt large guide washer backwards and it can cause t-belt edge wear from rubbing. It can cause a whinny sound too.

Other than a vacuum leak (idle issue) if the t-belt tensioner wasn't set right its possible the timing belt jumped a tooth and messed up the timing setting. If that's the case you'll need to pull everything apart and reset the tensioner gap along with re-doing the belt install to get the timing between the crank and cam gears reset.

PS - only tool needed to set the tensioner gap is a 4mm Allen wrench. Easy to get at any car parts store.

     
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