09-08-2013, 01:51 PM
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Originally Posted by Pittsburgh Toyota
I was replacing my water pump (due to a leak) on my 95 corolla (1.8 5 speed station wagon). I have done the timing belt and water pump before, so this is not new to me.
My problem is this:
I never find TDC before starting. I just pull off the belt, slip the new one on, and leave the car in gear, being careful not to move the crank or cam. Have never had a problem doing it this way.
This time, however, I bumped the cam and it shifted, so I need to find TDC for the crank and cam, but the belt is off already.
I have the cam aligned right (hole at the top), but I don't know which mark in the plastic cover to align the notch on the crank pully with. It only has 10 and 0 marked, and it is very ambiguous as to which of the four marks in the plastic cover is zero. Any input on this?
I have a picture if necessary, but can't find an easy way to upload it.
Also, how do I know which of the strokes the crank is on (since it turns twice as fast as the cam)?
Any input on this would be great. I'm mad at myself for messing this up, and would love to get the car back together and move on.
Yes, I've learned my lesson with doing this. I've had my head off twice since owning mine and I did this to myself once and NEVER again lol
The 0 is your TDC for the crank. Since its a four stroke motor you have to think of it like that. Turn your crank until the notch is at 0. You're #1 piston should be at TDC Compression. Once its at TDCC, roll your Cams together (Notch to Notch inward. Then take your cam gear, and have the crank and cam gear aligned. The hole on top should line up with something else, can't remember off the top of my head. Once you have that set up, take a feeler gauge and make sure your intake valve is open, and your exhaust valve is closed. This means that piston is at TDC intake stroke.
If you have another cylinder that is at compression on the cams but is at TDC, turn the motor over before by hand. This will create a vacuum in the cylinder and could damage something so make sure you turn everything over by hand first and you'll avoid that. Never had anything bad happen but it could.