Messed up and took head off without putting #1 piston at TDC
I need help!!!!!! I took the head off my 1.5 89crx without putting the #1 piston at TDC first. Now I'm having one hell of a time getting motor back in time... Hopefully someone out there has a solution to my serious mistake....
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Re: messed up and took head off without putting #1 piston...
Hi there.... I'm assuming you have the head back on. the easiest way is to try and line up the timing marks an the pulleys and install the timing belt. If you have done this and the timing marks line up as they should, you can take the sparkplug out of the #1 cylinder and manually turn the engine over till you can feel air pressure coming out of the plug hole. continue turning the engine till you can't feel anymore pressure. Don't go too far cause then you'll be on the intake stroke and you'll have to turn the engine the opposite way. with the #1 cylinder at TDC, take you distirbutor and cap and figure out what position the rotor should be at for #1 plug. Mark the distributor somewhere where that position is ( where the #1post on the cap should be). Finally insert the distributor and try to get the rotor as close to that position as possible. remember when you install the distributor, The rotor position will move due to the gear set up. Once you have the distributor istalled, you can adjust the distributor for timing by turning it. Hope this helps you out. If you have any other questions, please don't hesitate to ask..
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The best way is to turn engine over to #1 cylinder, turn by damper pulley. Remove #1 spark plug first and put a straw or similar device in plug hole on top of piston so you can tell when its at tdc. Just before #1 piston goes down thats tdc. To replace distributor put it back in with rotor button pointing to #1 wire in cap,tighten, replace the plug then start vehicle When vehicle starts adjust distributor by turning it either way. God_bless!
You need to turn the engine over and bring it up to top dead center (TDC). Aline your put the chain or belt on. The crank gear will be on you just will need to aline the cam gear as I believe it is overhead cam. Do NOT force the cam gear to turn as you can bend your valves. When you are putting in the distributer as you slide it in it will rotate a bit. Make sure it is alined to where your rotor will be faceing to the #1 position on the cap. I hope you understand. If need be I can look up the timing marks for the cam for you just post a comment if you need. When I say to bring to TDC you turn the engine over to where the # 1 piston is to the top of the cylinder. Hope this helped and good luck.
Take out the No. 1 sparkplug, turn the crank by hand, watch for the timing mark to come up and when it is close insert screwdriver or similar into cylindar and feel the piston come up. TDC should be at the top of the stroke and match the timing mark. Should remember but don't, No. 1 is drivers side ?? Looking straight down at the motor, it is the one farther foward.
Two major things wrong with this answer: First: NEVER insert a screwdriver into the spark plug hole to find TDC. You can nick or scratch the top of the piston head, which will cause hot spots which in time will crack the piston head which in time will mean you will be paying for a major engine rebuild! Instead, use a plastic (not wire, not wood) coat-hanger cut along it's longest length. Second: You need to know more than just where TDC is for most applications. What most people really need to know is where is TDC on the COMPRESSION stroke. (The stroke where the spark plug fires, rather then the exhaust stroke where the piston pushes the waste gasses out of the combustion chamber at TDC). You do this by putting your thumb against the hole where spark plug # 1 goes. Then rotate the engine by hand (ALWAYS clockwise if you are standing in front of the vehicle, facing it) and wait until you feel a large puff of air escaping. THAT is TDC on the compression stroke. Pull off your Distributor Cap and look at where the rotor is pointing. It should be pointing to Cylinder #1. If not, you either mistook the small puff of air that happens on the exhaust stroke for the big puff of air that happens on compression, OR, your distributor is not seated right in the engine. BTW: Cylinder #1 on a Chevy 350 V8 is on the front left (meaning driver's side of the engine closest to the front of the vehicle.) Good Luck!
To set the timing you should turn the No.1 piston to TDC, then turn the cam to where both valves on No.1 are close. The timing mark on the sproket should now be in line with the mark on the cilinder head. With No. 1 still on TDC fit the chain.
After fitting turn the engin a few times by hand to make sure there's not a valve pushing against a piston.
If the timing chain is still in the correct position its an easy fix. Put screwdriver down spark plug hole #1 and rotate the engine over by hand until you reach TDC e.g. piston fully up. Now your either on the start of the ignition/power stroke or at the end of the exhaust stroke. Im not sure of the firing order of your specific engine but basicly this means that the engine is either firing on 1 at TDC or its firing on its other piston. Just put the screw driver down the other cylinders and find the other piston thats at TDC. Put the distributor back in so that the rotor button lines up roughly with the post on the cap that lines up with one. Put the cap back on and try and start it. If it almost starts just trim up the cap a little (twist it by a few degree either way) If it sounds way out then pull the distributor back out and line it up with its mate piston.
Hope this helps
Turn crank so that timing mark on front pulley is at 0 degrees.
Remove the timing cover and you should see a mark for the cam to line up with.
You want the cam lobes on No.1 cylinder to be pointing away from the followers wether they be rockers above cam or buckets below. This will be the compression stroke.
Once the cam timing is set you can recheck the distributor. It should point to No.1.
Bring the crank to TDC while WATCHING CAREFULLY the camshaft, making SURE that the pistons are moving in the correct sequence as the valve train. Once you have the #1 piston on TDC, Set up your valve train with what looks to be the most logical position. Then and only then should you consider the factory spec for setting the lead/lag time of the valve train, in degrees. Hope this helps....accordianman