turbojohnny Posted July 1, 2009 Share Posted July 1, 2009 it looks like the crank pulley and degree marks line up, but i don't see anything special lined up on the cam sprocket with the chain? can you give me a hand so i can go ahead with my Head Gasket replacement? Quote Link to comment Share on other sites More sharing options...
turbojohnny Posted July 1, 2009 Author Share Posted July 1, 2009 anybody? Quote Link to comment Share on other sites More sharing options...
rossman Posted July 1, 2009 Share Posted July 1, 2009 You're not getting a response because you are asking a question that can be found by searching or RTFM. Sorry, not trying to be an a$$, just letting you know. I can't tell by looking at the timing chain. Is the #1 piston at the top of its bore? Are both the #1 cylinder intake and exhaust valves closed? If the answer is yes to both of those then it is at TDC. Quote Link to comment Share on other sites More sharing options...
roger.svoboda Posted July 1, 2009 Share Posted July 1, 2009 if you should do this again you might try marking with a sharpie and/or take some pics before you dissasemble you'd be surprised how helpful that is. Another thing might be to study how an engine works and learn the suck,squeeze, bang, blow cycle then you wouldn't have to ask silly questions like where is tdc. Quote Link to comment Share on other sites More sharing options...
Careless Posted July 1, 2009 Share Posted July 1, 2009 shove a straw in the spark plug hole and hold it upright with your finger and align the mark to where it's supposed to be at TDC by manually turning the engine over, and when the straw reaches its high point and the marks are on spot, you're at TDC. simple as that in most cases. just hold the straw because of the weird angle on the spark plug holes for L heads. Quote Link to comment Share on other sites More sharing options...
turbojohnny Posted July 1, 2009 Author Share Posted July 1, 2009 i understand how an engine works, this isn't my first time finding tdc , just my first time working on a nissan motor, i did search, and i even have a manual for the car. and everyone says something about some mark on the cam gear having to line up with a bright link on the chain, but i don't see any markings on the gear lining up with any bright links on the chain. i just wanted to be sure i wasn't going to mess anytrhing up before i took the gear off the cam and pulled the head. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted July 1, 2009 Share Posted July 1, 2009 Turn the motor over a few times by hand and keep stopping at TDC on the crank pulley. When the front two valves are shut and the piston is up, you are at TDC. Eventually, you will see that the cam/chain marks will line up too. Quote Link to comment Share on other sites More sharing options...
thrustnut Posted July 1, 2009 Share Posted July 1, 2009 There is also a V shaped notch on the back part of the cam gear, and an oblong grove in the cam retainer plate. Like stated before, when you are at the top of the power stroke (piston all the way up, both valves closed) that notch should line up with the grove. I never worry too much about the bright spot on the chain. Quote Link to comment Share on other sites More sharing options...
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