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Old 09-26-2014, 05:29 PM   #1
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Viggen engine whine.

I thought I'd start my own thread, didn't want to high jack a previous engine whine thread. No one was replying that one anymore anyway.

So here's my story. I bought a Viggen with a cracked piston. After having the car sitting for a year I finally got around fixing it. I replaced the cracked piston with a used one, same type. Cylinder walls looked like new. Replaced all the timing bits. Cleaned the pan... It was dirty but there was sludge... Screen looked Ok.. Replaced the rod bearings. Opened up the first main bearing to check... It looked fined. On the first start I was welcomed with much valve noise and a whine... All the valve noise disappeared after a few minutes... But the whine remained till now. 1500km later.

Well.. I tried undoing the chain and turning a few times. Put back the chain... Same whine. Replaced the plastic pin on my tensioner as well since the rear portion seemed to have broken.
No change....
Removed the belt... Engine had the same whine... Used a stethoscope and it seemed the loudest when I placed the probe on the valve cover right above the timing chain.
Installed a cheap Chinese oil pressure gauge at the oil filter... Getting about 72psi on cold start and gradually goes down to 10psi... Lol... Maybe something wrong with the gauge and my wiring since turning on the headlights the pressure drops by 10 psi... Thus showing 0 when engine is warm. Anyway... I think the 72psi at start up can be trusted. I'll get a mechanical gauge or a better quality electric one.

For now.. I don't think it's an oil. Pressure problem. Never heard of anyone with oil starvation have engine whine.... Or is there.
The only thing I'm suspecting right now is maybe I didn't installed the main bearing I removed correctly? Is it possible to have it reversed? I'm puzzled.

Here's a video. Greatly appreciate any input.

Viggen engine whine.: Viggen engine whine. - YouTube
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Old 09-26-2014, 06:44 PM   #2
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If it's loudest on the chain side top and bottom it's probably worn timing or balance shaft chain guides, especially if it was sludgy.
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Old 09-26-2014, 06:52 PM   #3
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If it's loudest on the chain side top and bottom it's probably worn timing or balance shaft chain guides, especially if it was sludgy.
New timing kit was installed... So new chains... guides... sprockets...
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Old 09-26-2014, 09:01 PM   #4
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Oops! Missed that bit.
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Old 09-26-2014, 11:56 PM   #5
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How did the oil pump look? What is end play on it, although they are almost always out of spec lol...
Is it possible for you to get a video for us with good qaulity audio?

Have you taken the serpentine belt off and ran the engine? If not try that, might be a quick way to see if it actually coming from the engine!
Best of luck.
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Last edited by 93viggen; 09-27-2014 at 12:01 AM.
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Old 09-27-2014, 04:23 AM   #6
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Originally Posted by 93viggen View Post
How did the oil pump look? What is end play on it, although they are almost always out of spec lol...
Is it possible for you to get a video for us with good qaulity audio?

Have you taken the serpentine belt off and ran the engine? If not try that, might be a quick way to see if it actually coming from the engine!
Best of luck.
There were a few fine scratches on the pump gear... Other than that it seemed like a tight fit...

Quality audio... I'm not sure what could produce better quality... I just used my HTC one... Would an iPhone 5 be better?

Yes I did ran it without the belt... Same...

So you think it could be the pump whining? Maybe I should replace with a new one and see?
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Old 06-12-2017, 07:33 PM   #7
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Did you ever figure out what the problem was? I've got a 97 900 SE Turbo with the same issue. I ran through the same set of diagnostics (dropping the pan, checking the pickup screen and oring, replaced the oil pressure regulator, pulled the oil pump apart and renewed oring and crankshaft seal, etc.).
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