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Need to get cams on compression stroke

Left cam faceing motor out of time

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  • mntterror
    mntterror Feb 21, 2012

    I did not break or throw the timing belt , I had to take it off to replace the water pump . And when i was working on getting the crank pully off, the cams got out of time , I know the drivers side times to #1 cylinder , but what cyclinder do I time the passenger side cam to . Is it #2,#4 or #6 cylinder? I know how to check that I am on the compression stroke

  • mntterror
    mntterror Feb 21, 2012

    I believe the passenger side cam is the one that is out off time , because when I put it on the timing mark , it kept wanting to spin pass the timing mark and I would have to turn it back. Does this mean that it could be 180 degrees out?

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I there are many ways to see if you are on a compression stroke but the best and most definitive way is to remove the rocker cover and watch the vavles as they move up and down while rotating the engine by hand by hand by hand with the ignition turned off.
When you are on the compression stroke both the valves for that cylinder will be in their highest position and there should be some slack between the valve and the rocker arm.
When timing and engines this is usually done on number one cylinder top dead centre compression stroke.
Regards

Posted on Feb 20, 2012

  • Trevor Forrester
    Trevor Forrester Feb 22, 2012

    http://www.samarins.com/glossary/dohc.ht... will show you how it works.

    both cams should be set to 1 cylinder top dead centre. It is important to remember that one cam operates the inlet valves and the other the exhaust valves.

    The reason you are having a roll on effect is because one cylinder is still under compression. I would suggest that you remove all the sparkplugs and go back to basics.
    Remove the timing cover and realign all the timing marks on the cam shafts and the crankshaft. Most people do not understand that because it is a four stroke engine that the top dead centre is reached twice in one cycle.

    The first time the piston comes to top dead centre it is on the compression stroke and the second time is on the exhaust stroke. The diagram's at the link above will give you an idea how it works.

    You may only be out in your cam timing by one or two teeth or notches, and this can be enough to give you backfire or instability in the firing cycle.

    Unfortunately there is no easy way to fix this, you could just try moving the cam one tooth or notch at a time but unfortunately you may never get it right.

    That is why I suggest going back to basics.

    Regards

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emissionwiz
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SOURCE: 1988 toyota camry 2.0 engine (timing)

Pull #1 spark plug and rotate the engine until you hear air rush out of the cylinder, (plug the hole with your finger if you can), then look at the timing mark, it will be close to TDC

Posted on Oct 04, 2008

reisdos
  • 1297 Answers

SOURCE: Are your cams in correct time as long as the

as long as it looks like this...

365f2b7.gif


however, this only give you base engine timing

ignition timing is done with sensors and computers

Posted on Jun 09, 2010

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