timing car with engine in car
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Northstar Engines and System Technical Discussion Discussion, timing car with engine in car in Cadillac Engine Technical Discussion; can a 95 Eldo be timed with the engine still in car? reason why I'm asking is that I'm considering ...
  1. #1
    Pete315 is offline Cadillac Owners Fanatic
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    timing car with engine in car

    can a 95 Eldo be timed with the engine still in car? reason why I'm asking is that I'm considering replacing my HG myself with Norms Inserts. I going to secure the chain the best I can w/o it tightening up. in case the timing chain moves, I need to know if it can be timed still with engine in car. is there a special tool to lock the chain in place? with chain locked in place, will I be able to slide the cam sprockets on and off? I did a search but was unable to get procedure of securing chain. if anyone has procedure or pics, that would be great.

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    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
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    Re: timing car with engine in car

    As soon as you release the tension on the chains (by sliding them off the cams) the tensioners down under the front cover will extend and you will not be able to recompress them without taking the front cover off. You have to figure out a way to keep those tensioners from extending, or your screwed. They make a special pair of holders to keep the tensioners compressed, but they look lik a gaint pair of pliers and you can't pull the head off with them inplace.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: timing car with engine in car

    Great big black nylon tie-wraps. The front (chain) cover has to come off anyway, so you can put considerable tension on the chains, and then you follow the GM shop manual procedure for pinning the tensioners.

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    bigtone's Avatar
    bigtone is offline Cadillac Owners Fanatic
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    Re: timing car with engine in car

    If you remove all the bolts from the front cover, it will open up about an inch and a half or so at the top. You can use a steel pick or a piece of wire to release the tensioner while pushing the shoe back from the top opening in the head with a big screwdriver. There really is not alot of tension there. You can see the orange handled pick in these pics locking the tensioner (if they will upload for me). Also, make life easier by locking the engine at TDC #1 before you start taking it apart. Also lock the cams.
    Attached Images

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    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
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    Re: timing car with engine in car

    Rotate the engine so that it is at TDC compression on cylinder #1 (the lines on the cam sprockets with be at 90 degree angles to the valve cover gasket seating surface). Take a screwdriver and etch a line on the timing cover and the crankshaft pulley so you know where that has to be (I say this because it is very hard to take off the sprockets without having the chain jump; this is your plan B). Mark the chain and the cam sprockets. Get a piece of wood and cut it into a triangle (you may have to figure out the dimentions and make sure no splinters will fall in). Stuff it down in the chain to keep the tensioners from expanding. Take off the sprockets and remove them from the chain. Now the head can come off.

    ^^Certified ghetto engineering^^ haha

  7. #6
    Pete315 is offline Cadillac Owners Fanatic
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    Re: timing car with engine in car

    so it looks like I would need that cam locking tool and the tool that locks the flywheel. from that picture, what are you pushing with that pick to unlock the tensioner?

  8. #7
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
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    Re: timing car with engine in car

    Quote Originally Posted by Pete315 View Post
    so it looks like I would need that cam locking tool and the tool that locks the flywheel. from that picture, what are you pushing with that pick to unlock the tensioner?
    The pick is engaging the tensioner release lever.

    These are my opinions:

    I really think the easiest thing is to drop the cradle.

    If you really insist on doing it in the car, I think you should, at the minimum, remove the damper and timing case cover, at least the first time you do it, so you can inspect the timing chamber components and see what is going on in there and also to be sure you are timing the engine correctly. I have done the HG project, with the cradle and engine completely out of the car and the damper and timing case cover off, and if I had to do it again, I wouldn't do what you want to attempt. To attempt it, with no prior experience or a complete understanding of the engine timing, on an interference engine, seems very brave and adventurous to me, but maybe it'll work out OK for you.

    But I still say: drop that cradle - it's really much, much easier in the long run.

  9. #8
    bigtone's Avatar
    bigtone is offline Cadillac Owners Fanatic
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    Re: timing car with engine in car

    Quote Originally Posted by Pete315 View Post
    so it looks like I would need that cam locking tool and the tool that locks the flywheel. from that picture, what are you pushing with that pick to unlock the tensioner?
    As mentioned above, the pick is holding the lever on the tensioner. You dont need any locking tools, for the cams just remove one cap and put a small piece of paper in there and reinstall the cap. For the crankshaft, I removed the starter and used a piece of scrap aluminum that had a threaded hole in it. I bolted the aluminum down using one of the starter bolt holes, then threaded another bolt through it to provide friction against the flywheel. I could force the engine to turn if I wanted to, but this method help it from turning for the most part.

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