Oil Pump Whine?? (Video Included)
I've got a '97 Saab 900 SE Turbo with 350k miles. Just replaced the head gasket on it. Now that I've got it back together there's a noticeable whine coming from the oil pump area. The whine is still there even with the serpentine belt off. (Video link: https://vimeo.com/218544188/f86017032e)
I've tried replacing oil pressure regulator and spring, dropped the oil pan and checked the pickup screen for debris (it's clean), swapped oil filters, and pulled and reset the timing chain tensioner. I've also pulled the oil pump and visually inspected (replacing the housing oring and crankshaft seal). No sign of problems.
No luck. I'm out of ideas. Timing and balance chains were replaced 1yr ago with Saab OEM chains.
Any ideas on what I should check out?
Update: I ran out of ideas and took the Saab to a shop to see if they could help diagnose it. They ran through some of the same list that I didn't and couldn't figure out what was causing the whine. They pulled an oil pressure test and pressures checked out as normal. Idle: Between 18-20 psi. 2500 RPMs: Between 35-40 psi.
That sounds like balance shaft or timing chain to me. It didn't make that sound before the head gasket was done? When you removed the timing chain tensioner did the back chain guide pivot freely?
Stupid question, but you released the ratchet in the tensioner by removing the 13mm hex head bolt and spring from the tensioner before you put it back in, right?
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