Re: camshaft

Posted by 32model901 On 2010/11/5 18:05:47

Hello Erwan,

Are the cam and crank sprockets and chain original or new old stock? If they are reproduction parts it is possible they may not match the original design.

I was able to find some information out of a 30's Motor's Manual for checking and setting the valve timing on '35 thru '37 Packard six's.

Possibly one of the other fellow members can advise you if this information is applicable to your '39.

1935, 36, and 37
Packard 120, 120B, 120C

Checking valve timing:

Exhaust valve should just close 5 degrees or two flywheel teeth after top center with tappet adjusted to .013 inch clearance. To check the valve timing, adjust No. 1 one exhaust valve tappet to .017 inch clearance and insert a .004 inch feeler gage between the tappet and stem. Turn flywheel until the feeler gage is tight and continue slowly until feeler is just released sufficiently to be removed by finger pull. Timing is correct if the pointer now registers with a mark 5 degrees after No. 1 UP DC mark on the flywheel.

Timing chain renew:

With No. 1 piston at TDC and No. 1 exhaust valve just closed, line up the sprockets, with the chain assembled, and slip them on the shafts. The timing marks should be nearest each other and in line with a straight edge placed across the centers of both shafts.

Regards,

Dave