They do that -

Posted by Bob Carabbio on February 26, 1998 at 17:45:43

In Reply to: engine vibration
posted by Joe Koehler on February 26, 1998 at 13:48:04

Joe's list is inclusive -
My experience is that "A"s settle down nicely in high gear at 35 - 45 M.P.H. and shouldn't vibrate a LOT in that cruise range UNTIL you take your foot off the gas. The "Spool down" vibration was what used to drive me crazy in my old tudors (both used the same motor / tranny). They will always shake more that a modern engine, and there's a strong 2nd harmonic of the crankshaft speed that's a vertical vibration that CAN'T be balanced out without the "Silent Shafts" that all the 4 cylinder cars use nowadays.
If yours has an insistant vibration that just gets worse as RPMs rise, though, then something's wrong and the main bearings will pay for it before long.
I'd just add that the runout of the flywheel can be checked in a gross fashion by removing the access cover on the clutch housing and applying a dial indicator to the edge of the flywheel just outside the clutch pressure plate. This should be done both front to back, and from the side.
If you don't have an indicator, then good lighting and a screwdriver tip held close to the flywheel while another person turns the engine with the crank will spot runout for you. If you can see some - it's too much.
Let us know -
Bob Carabbio

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