• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

how do I find top dead center on 1978 GS1000

  • Thread starter Thread starter nhgsguy
  • Start date Start date
Line up the 1-4 or 2-3 T mark on the mechanical advance unit with the corresponding mark on the metal plate under the points/signal generator plate.
 
top dead center is when the piston is between its rise and fall.

There is only a brief moment when this happens before the piston begins its way down the cylinder again.

If the engine is assembles: Place your finger in the spark plug hole and turn the motor by hand until you feel the air escape past your finger. (top dead center on that piston) The others are at a little bit different point, but finding them is all the same. Usually two pistons will share the same TDC.

If the motor is UNassembles look at the top of the piston when it reaches the head portion of the motor. turn the crank and You'll see a moment before the piston goes down again.

Hope this helped and was not confusing, First time wrote it down.

YoungGun.
 
This may be obvious but there are two top dead centers in the cycle. The one described above is on the compression stroke with the valves closed and there is another tdc when the exhaust valve is open. Depending on why you need the info be sure which one you are looking for.
 
TDC on my GS1000

TDC on my GS1000

Thank you very much for the info.I was looking into the manual cam chain tensioner.The manufacturer says to bring a cylinder up to tdc,then remove the original tensioner and install the new one.
 
katman said:
This may be obvious but there are two top dead centers in the cycle. The one described above is on the compression stroke with the valves closed and there is another tdc when the exhaust valve is open. Depending on why you need the info be sure which one you are looking for.
Click to expand...



A VERY important point, that.


I use a pencil. Remove the spark plug and place the pencil in the hole......watch VERY carefully as the piston rises and when it stops you have it.

The last few moments before it reaches TDC and the next few as it begins its descent are important as there is not a lot of movement and you have to watch VERY carefully.

You can also fasten a marking pen on the pencil and place the tip against a sheet of paper so that it shows the exact moment the top is reached.
 
I have done it with a pencil before. Still do sometimes. :o

But, yes there is a but.

If one is not experienced in this method. The pencil can easily snap leaving one end in the cylinder. Which is a major, do I say major PITA to remove.

I did a write up on another forum where I mentioned a pencil to locate TDC for valve adjustment.

A fellow member followed the directions, but snapped the pencil, then turned the engine over a few times and the valves chewed it up is why I mention it. ;)


T marks as mentioned.

I tend to watch the ends of cams if adjusting the valves, but that was not the OT.
 
Last edited:
why not a 1/4' drive 6" extension, robertson screw driver, drinking straw?
 
Last edited:
You must log in or register to reply here.
Back
Top