cam/ignition timing

[goldwar]

ok so my 89 rex has a sohc zc {d16a6} and i recently did a full rebuild on it.
new pistons, rings , bored to 76mm head and block surfaced bearings the works
now when i go to put the timing belt on it doesn't line up so i bought a adjustable cam gear and made it work but how much would the machinist have to have shaved off to make it off almost a full tooth on the belt....... but the adjustment varies. one day took the belt off retarded the gear 10 degrees then put every thing back together and i have to advance the cam 18 degrees to make it in range for the ignition timing. so i take it off again set it to zero and put it all together and i only have to advance it 7 degrees.
timing belt tight all the time.i have no idea what i'm doing wrong if its me but i cant figure it out... anything would be helpful

 

[jlicrx]

are you sure you are getting the cam gear in the right position? stock gear has 3 marks on it, one at 3 o'clock, one at 9 o'clock and one at about 7 o'clock - for the D16A6 and SOHC ZC non-vtec, you use the mark on the cam gear that is at 7 o'clock (forget the other 2) - it aligns with the pointer on the inside timing belt cover

 

[jlicrx]

The cam will be 1.2* retarded for every .010" taken off.

not quite right - see attachment

 

[goldwar]

thanks ill try setting it before running the car. but i wish i knew how much my machinist took off the head and block. do you have a pdf for the compression differences with a milled head ?

 

[jlicrx]

i don't have a pdf with that - when setting the cam timing, make sure that you are using the correct mark on the crank pulley for TDC - it is the mark (should be white) that is off to the right a little ways from the 3 marks that are used for ignition timing