Well, let me first say, I'm a dumbass.



I am building a D16A6 with eagle rods, vitara pistons, etc, the usual. I have the block sitting on an engine stand waiting for the head to go on. Only problem is, when I pulled the head I am using off of the motor it was currently on, I didn't set it to TDC before taking the T-belt off.

Obviously I can line up the marks on the cam gears and line up the marks on the crank pulley and bolt it on, but aren't their rotational speeds different? Like the cam moves twice as fast as the crank pulley, right? So how do i know which rotation to set it on.

My only guess is to go by the valves. With the head off I can spin it around and see which valves are open and closed. When cylinder number one is at TDC, what are the other cylinders valves doing?

If anyone has insight as to how I should make sure the head is at the correct TDC then please enlighten me as it is going in tomorrow.

 

OK, so after some research my plan now is to spin the head around with a wrench on the pulley until it is lined up with the marks, then spin the block around until it is lined up with it's marks, then bolt the two together, slap the belt on and call it a day.

Sound good?

 

I'm dumb. The rotational speed difference makes no difference, which is you think about it, makes perfect sense. I'm going to bed now, obviously I need the sleep.

 

the crank cycles twice and the cam just one revolution.
make sure the crank is matched up to the cam.

 

hell just put a long screwdriver down into the cylinder through the spark plug hole and use that to make sure you have cylinder 1 TDC. then set the cam gear at TDC and put the belt on, and you'll be good to go

 

wait.. the A6 head uses only 1 timing mark on the pulley.. not 2. So you should be lining up the cam with the 1 timing mark on the timing cover for the A6. since there is only one, you can't mess it up.

the d15b2 and other d15's you line up the 2 marks across from each other on the cam pulley with the plane of the head. You are correct about the cam spinning half speed, so you could theoretically mess it up if you didnt notice your valves were open on cyl #1 putting the head on.

for what it is worth, if you wanted to make sure that a d15b2 head was in the right position, a good macro indicator of that is to make sure the third cam timing mark is pointing down instead of up.