Re: Set timing on 1924 Straight Eight Engine

Posted by Owen_Dyneto On 2011/3/29 7:48:28

I know the 1st and 2nd Series Eights had a unique firing order, different from all later in-line Packard 8s, and I'm not sure that would make a difference but I doubt it. The earliest references I have are for the 7th series.

Packard specifications say "OOs of crankshaft and camshaft sprockets should be nearest together and line up on each side of center". Note they make no reference to piston position.

Chilton's says "Valve timing: With No. Inlet tappet set to .004 in. inlet opens 20 degrees or 6-1/2 flywheel teeth before T.C.. Marks on cam and crank sprockets should align thru the shaft centers". But they don't say the marks should align at this point of valve opening.

Assuming you've got the correct crankshaft and cam sprocket, just aligning the marks should do the trick, but then before you button it up, rotate to 6-1/2 flywheel teeth or 20 degrees before TDC and see if inlet #1 is at the opening position. I believe the cam grind is a bit different in the 1st and 2nd series, so perhaps give or take a few degrees may be of no consequence.

Sorry, wish I had some earlier references. If you really get in a bind, let me know by PM, I have a friend who has rebuilt several 1st and 2nd series Eights.