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1995 Chevrolet Silverado Z71 6.5 TD
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Discussion Starter #1
Cold start, after engine runs for 2.49 mins noise starts right side of engine. At 4.15 min noise increases. When driving engine runs fine otherwise. Where or how can I upload a audio file from iphone recording voice memo.
 

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I'm gonna wait for the video or audio file.... :thumb:
 

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1995 GMC Suburban
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17,811 Posts
Check the front pulley first.
That is the Crankshaft Pulley which is attached to a Harmonic Balancer.
You need to go down under, remove the skid plate if it is there.
Then look at the rubber sorrounding the center of the pulley with a good lighting.
After that, you can have somebody turn on the engine (make sure it is not moving).
Go down there again and see the pulley when it rotates.
 

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1995 Chevrolet Silverado Z71 6.5 TD
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115 Posts
Discussion Starter #6 (Edited)
Here is the video/audio of the noise on right side if engine. Engine was cold start and noise starts at 2:00 minutes there are about 30 seconds of video with noise. I also noticed that when noise begins the exhaust tone changes a little muffled.
. Let me know if the link doesn’t work. Thank you
 

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Yea it came through..



That has rotating assembly sounds, too light for rods or piston slap..



What is your oil pressure when this starts?



You could remove the belt and see if the sound stops, if it does it's something in the accessory's...
 

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1995 Chevrolet Silverado Z71 6.5 TD
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115 Posts
Discussion Starter #8 (Edited)
Engine Noise

Yea it came through..



That has rotating assembly sounds, too light for rods or piston slap..



What is your oil pressure when this starts?



You could remove the belt and see if the sound stops, if it does it's something in the accessory's...
Engine oil psi at startup 45psi. Once engine temp up to 195 and engine at idle oil 20psi but 40psi when driving. I dont think its rods or piston noise. Engine runs fine at all speeds it quiet no miss, hesitation or bucking great power also.
 

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Vacuum pump I believe. :thumb:
 

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To test that ^^^

Just ***carefully*** put ur hand over the side of the pump while it's running. Theres a little cap muffler thing that falls out (common) and it starts to get a bit noisy. They also get noisey when they begin to fail as well.

Let me see if I can dig up a pic of a vac pump and circle the area I'm talking about.

Be right back.
 

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... that part..

May not be the correct replacement part BUT... just grabbed the pic to show where you put ur hand.

Careful about that fan. Dont want anyone getting hurt!

:thumb:
 

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Premium Member
1995 Chevrolet Silverado Z71 6.5 TD
Joined
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115 Posts
Discussion Starter #12
Engine Noise

... that part..

May not be the correct replacement part BUT... just grabbed the pic to show where you put ur hand.

Careful about that fan. Dont want anyone getting hurt!

:thumb:
Thanks i'll check it out and get back.
 
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