87 turbo supra runing bad.

IHateHacks · 03-24-2007, 01:39 AM

Ok, you said: "at tdc the timing mark is at like 4 or 5". You must be talking about the crank pulley, correct? Bottom line here is, the crank pulley is "keyed" onto the crankshaft nose, so if the crank pulley is installed (only one way to install the crank pulley because its keyed) TDC is at 0. What makes you think TDC is at "4 or 5"?

It really sounds like someone didn't install the timing belt or the cam gears correctly.

Try this, take off the upper timing belt cover, put the crank pulley at 0 and make sure the matchmarks on the cam gears line up with the notches on the inner timing cover. When the crank pulley is lined up with the 0 mark you could be at 1 of 2 TDC's. One of them is the compression stroke and the cam marks will line up with the notches on the inner cover. The other one is on the exhaust stroke and the matchmarks will be 180 degrees from the notches on the inner timing cover, so you might have to spin the crank twice to be on the correct TDC. The crank spins twice for every time the cams spin once, so the cams will revolve 1 time for every 2 revolutions of the crank.

So just make sure every 2 times you spin the crank to the 0 mark, the cams line up with the notches. I would really start there, I know it sounds confusing but once you know what I'm talking about, you'll see its pretty much common sense.

One last question, did this problem just arise out of nowhere or did someone "repair" something and now it runs like this?

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03-24-2007, 01:39 AM	#2
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Ok, you said: "at tdc the timing mark is at like 4 or 5". You must be talking about the crank pulley, correct? Bottom line here is, the crank pulley is "keyed" onto the crankshaft nose, so if the crank pulley is installed (only one way to install the crank pulley because its keyed) TDC is at 0. What makes you think TDC is at "4 or 5"? It really sounds like someone didn't install the timing belt or the cam gears correctly. Try this, take off the upper timing belt cover, put the crank pulley at 0 and make sure the matchmarks on the cam gears line up with the notches on the inner timing cover. When the crank pulley is lined up with the 0 mark you could be at 1 of 2 TDC's. One of them is the compression stroke and the cam marks will line up with the notches on the inner cover. The other one is on the exhaust stroke and the matchmarks will be 180 degrees from the notches on the inner timing cover, so you might have to spin the crank twice to be on the correct TDC. The crank spins twice for every time the cams spin once, so the cams will revolve 1 time for every 2 revolutions of the crank. So just make sure every 2 times you spin the crank to the 0 mark, the cams line up with the notches. I would really start there, I know it sounds confusing but once you know what I'm talking about, you'll see its pretty much common sense. One last question, did this problem just arise out of nowhere or did someone "repair" something and now it runs like this?