Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks
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I'm needing to reduce engine vibration and looking at possibility of getting my engine balanced. Since I'm not the first owner of the car, I'm not sure if the engine has aluminum pistons, although the engine looks like it has been overhauled from its external appearance. If so, I'm assuming that the previous owner didn't rebalance the crank, flywheel, and damper to match that possible change. I'm curious whether the flywheel and damper are matched to the rest of the components, or independently balanced and then installed. If matched, I would assume that the flywheel is marked or bolt pattern offset to prevent incorrect installation. The damper is indexed by its keyway. The first assumption one might have is that the engine has a weak cylinder or misfire. Spark plugs have been inspected, compression has been checked. Points, condenser, and cap have been changed. Car has accumulated several thousand miles with this same vibration during the last 8 years. Peak vibration at about 2200 rpm. Idle ok. Looking for more information.
If all the rubber mounts are good and properly installed I would balance the flywheel and clutch assy and then see if it helps before getting inside the engine. Those are the components that in my opinion would have the greatest affect. Also check the trunnions on the u-joint.
7472 old site post
My 37 straight eight Buick does the same thing. About 2000rpm. I've checked everything also. I've just kinda assumed they just weren't that well balanced back then. That and I'm really really not willing to do what it would probably take to get it all balanced out.
If you are, then you're a much better man.
@steve-d The vibration issue is independent of vehicle speed. Vibration is present either driving down the road, or stopped, in neutral. It reaches peak vibration at 2000 - 2200 rpm. I wish the problem could be as simple as the trunion. Btw, I have a '32 Pick-up, restored, that does not have this problem. I can have the flywheel, clutch, and damper balanced. I was just curious if the flywheel is indexed to a position that compliments the crank, rods, and pistons.
@william-j-anderson Yes it is indexed when aligned with the dowels on the end of the crank.
7472 old site post
@steve-d That would indicate that an optimum balance should involve crank, rods, pistons, clutch, flywheel, and damper as a system. Not surprised, just hoped that would not be the case.
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