Question about 1993 Lincoln Continental

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Replaced valve stem seals on 93 town car today and now it run very rough and dies

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  • Tim Dehnke Sep 17, 2010

    no, the heads were not removed infact i was not able to replace the seals due to a spring compressor tool failure. plugs were out during the work done and they are new. the chain gear was removed from the cam shaft but it has a key way so i cant imagine the timing would be lost. car wont stay running and run very rough when it does. i am at a loss as to why.

  • Tim Dehnke Sep 17, 2010

    on my 1993 lincoln town car i attempted to replace the valve stems seals but was not able to remove the springs due to compressor failure. chain gear was removed but the chain remained on the gear. i did manually turn the motor clockwise to bring the piston up after the chain gear was removed from the cam shaft. re-installed the cam shaft and had to manually turn the motor in order to line up the key way on the shaft and chain gear. tried to fire up the motor after everything was re-installed and it wont run smooth or at all.

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  • Master
  • 1,978 Answers

The valve stems seals should not effect the engine running at all. At most some exhaust smoke. You will have to look carefully at the items you took off when you were working on the engine. If any wires were taken off or knocked off the distributor cap, they may have been put back on incorrectly. Also vacuum plays a very important role in the way your vehicle runs and of course climate control inside. Go over all the vacuum lines carefully , may sure they were not switched or that hidden connections were not missed( not plugged back in at all). The same thing goes for any wire harness plugs that were disconnected for access to the valve covers. One missed sensor wire could be the source of the problem. Use a small mirror if necessary but look over the entire engine compartment. You could even have a broken ground cable to the engine or alternator giving you head aches. Replace any broken ground cables you discover , This is important for proper operation.

Posted on Sep 17, 2010

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  • Master
  • 1,796 Answers

Hi!
If you replace the valve stem seals without removing the cylinder head as I understand, and let's say the seals where correctly installed. Two thins could have happened, some oil got into the burning chamber and got the spark plugs, fouling them, or the oil bot carbonized on the seating base of the valve or the sealing surface or the head preventing the valve from sealing properly.
Check and replace your Spark Plugs if they are fouled, Make sure all vacuum hoses are good and tightly connected.as well as all the electrical connectors.
Good luck and Keep me posted!!

Posted on Sep 17, 2010

  • 2 more comments 
  • Rene J Solis Sep 17, 2010

    OK, make sure all your vacuum hoses and electrical connections are nice and tight. Go over the procedure once again in your head (without removing anything), just to see if something was left out. You know what was done and how, try to go back and recheck that everything was put back the way it was removed. Keep me posted in case you need some diagram or something to help you fix the problem.

  • Tim Dehnke Sep 17, 2010

    the only thing that was done was cam shaft was removed and all rocker arms taken out, timing gear was removed from shaft but chain was not removed from it. rotated the engine manually clockwise to bring piston up and then had to reassemble due to compressor failure. once the shaft was re-installed the chain gear key way did not line up any more so i manually turn the engine clockwise until it did. re-assembled everything else and fired up the engine and it ran very rough. I thought the rockers may have fallen off but they are tight. i may have not put the rockers back in the same place as they came out but the all look the exact same.

  • Rene J Solis Sep 17, 2010

    If the timing marks are not aligned properly it can cause the problem you are experiencing and damage to other engine parts can occur as well.



    During most engine rebuilds, a completely new timing assembly should be installed. If wear exists on any component, replacement of the entire assembly is necessary. Wear in the chain, gears, or sprockets means a timing lag, which results in poor engine performance.

    The timing chain or belt is generally installed with the gears in their correct positions. Before installing a new chain, soak it in oil.

    OHC (Overhead Cam) Engines

    Some OHC engines use a chain drive; others use a belt drive. Removing the cover on some OHC engines that have timing chains is more difficult, because the cover often fits between the oil pan and the cylinder head. There are special procedures for replacing cam timing components in these engines.

    Before a chain repair job, perform a leakage test on non-freewheeling engines to check for bent valves, so that an accurate repair estimate can be made.

    OHV (Overhead Valve) Pushrod Engines

    On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).

    The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).

    The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another.


    The timing chain or belt is generally installed with the gears in their correct positions. Before installing a new chain, soak it in oil.

    OHC (Overhead Cam) Engines

    Some OHC engines use a chain drive; others use a belt drive. Removing the cover on some OHC engines that have timing chains is more difficult, because the cover often fits between the oil pan and the cylinder head. There are special procedures for replacing cam timing components in these engines.

    Before a chain repair job, perform a leakage test on non-freewheeling engines to check for bent valves, so that an accurate repair estimate can be made.

    OHV (Overhead Valve) Pushrod Engines

    On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).

    The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).

    The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another.

  • Rene J Solis Sep 17, 2010

    I would recheck the timing. I am almost certain that the timing marks are not aligned.

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