Packard Forum Index » Pre-War (1899-1942)

I have a 1928 6 cyl and need to adjust the valve tappet spacing. Can anyone point me to a guide that will tell me how many thousands of an inch I should have for the intake and exhaust valves? I think they should be .007 (in) & .010 (out) I will also add .002 as they will be measured cold.

Thanks
Gar

1929 manual gives .004 or greater, when hot. Page 129

packardinfo.com/xoops/html/modules/archi ... p?catID=10&cat_pid=56&ContentID=130

I suspect that any greater measurement that permits silent operation would be acceptable.

Hi Gar,

The 1922 - 1928 Service Manual says the same: “Remove valve cover plate and adjust tappets standard - not less than ,004” clearance with motor warm and idling. Be sure to use wrench S. T. 216. Note: Be sure valve adjusting screws are properly locked. See that valve cover center stud is tight so it will not lie against distributor drive shaft, causing rattle”

Phil

I always set them warm at .007in inlet, .010in Exhaust. Set half the valves in the engine firing position ( No 1 Inlet and Exhaust Closed). rotate the engine 360 degrees and set the remainder of the valves ( No 8 inlet and Exhaust closed). Use tappet spanners which are readily available at flea markets, Hershey, etc. Peter Toet

Is is safe to use heat on the tappet nuts?

I have tried to break the buts free with my std open end wrenches but cannot get enough leverage to break the nut free.

Thanks
Gar