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Message started by OK-944 on Aug 13th, 2019 at 2:59pm

Title: "Fluttering" Under Load
Post by OK-944 on Aug 13th, 2019 at 2:59pm
Well maintained 1987 NA with 165K miles: While driving under some load...like a medium uphill grade in 5th gear with engine at around 3K rpm's - I can feel a slight "fluttering," like something is just a bit out of balance. 

Hard to say exactly where this is coming from - but definitely not from the rear of the car.  More like either directly underneath the gearshift, or forward towards the back of the engine.

Balance shaft timing checks out ok - so my thought is that this is a torque-tube issue.  As in it may be time to address the TT bearings.  Then again - perhaps this an early sign of a main bearing issue?

Oil pressure has always been good.  All other gauge readings fine and consistent.

Any ideas?  Thanks!

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