Question about 1990 Toyota Celica

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Oil on sprark plugs

How do I change valve seals ?

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  1. Disconnect the negative battery terminal.
  2. Remove the valve cover, using the proper procedures.
  3. Remove the camshaft, shims and rockers, if equipped, using the proper procedures.
  4. Remove the spark plugs.
  5. Rotate the engine to Top Dead Center (TDC) for each cylinder's seals that are being replaced; e.g., if replacing the No. 2 cylinder valve seals, have the No. 2 cylinder at TDC. Use a coat hanger put down into the cylinder to determine when it is at TDC.
  6. Attach a fixture at the flywheel or the front of the engine to prevent the engine from rotating. Make sure the fixture damages no components.
  7. Thread an adapter into the spark plug holes that can be hooked up to a shop compressor air hose.
  8. Apply 90 psi of shop compressor air to the adapter hose. This is done to keep the valves from dropping down into the cylinder when the valve springs are removed.
CAUTIONTo avoid personal injury, wear eye and ear protection. Keep hands and clothing away from engine parts that rotate, in case the engine does rotate from the cylinder air pressure.
  1. With the cylinder under pressure, remove the valve spring retainer and the spring, using a spring compressor tool. Hitting the spring retainer with a soft hammer may help loosen the valve keepers, if the keeper will not move downward when trying to compress the spring.
  2. With the valve spring removed, remove the oil seal.
To Install:
  1. Install a new seal, using Toyota Special Service Tool (SST) 09201-41020, or equivalent.
  2. Reinstall the valve springs (See Valves).
  3. Release the air pressure and reverse the removal procedures to complete installation.
  4. Connect the negative battery terminal, start the engine and check for leaks.
oil on sprark plugs - 0900c15280046373.jpgFig. 1 Removing the valve sealsCelica Fig. 2 Intake and exhaust valve sealsCelica 0900c15280046379.jpgFig. 3 Installing the valve sealsCelicaWith Cylinder Head Off Engine
  1. Disconnect the negative battery terminal.
  2. Remove the cylinder head, using the proper procedures.
  3. Remove the valve and spring (See Valves).
  4. Remove the oil seal.
To Install:
  1. Install a new seal, using Toyota Special Service Tool (SST) 09201-41020, or equivalent.
  2. Reinstall the removed components to complete installation.
  3. Connect the negative battery terminal, start the engine and check for leaks.

Posted on Aug 25, 2008

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Rocam1.6 06 model uses oil sparkplug No2 gets wet with blk carbon, misfirin smokin white.If I change tht spark plug it goes well For3 days.Mechanic changed the rings after 6 weeks problem persists.hlp


The carbon suggests that oil is finding its way into that cylinder and oiling/carbonising the plug.

The mechanic changed the rings so it's doubtful that the oil is finding its way into the cylinder, past the rings. The only other thing I can think of is that the valve stem guide is worn (this would allow oil down into the cylinder) or the valve stem seal is perished/worn.

The photos below are generic images. They are NOT of your car:




26063798-uep1qeforvmfktksxbn30q5u-5-0.jpeg A valve in the valve guide. A worn guide can allow the valve stem to 'rock' and permit oil to trickle down the valve stem into the cylinder.



26063798-uep1qeforvmfktksxbn30q5u-5-1.jpeg The seal itself - rubberised.

There's many different types of seal. General image below just for illustration purposes:


26063798-uep1qeforvmfktksxbn30q5u-5-3.jpeg
Bluish smoke indicates that oil is being burnt in a cylinder. To be honest, worn valve guides/worn seals are quite common. You say your car is misfiring? That would indicate quite a lot of oil is fouling the plug. In most cases there would be no misfire after just 3 days. The exhaust would cough out bluish smoke at start up and maybe on the over-run, when going downhill.

A short term measure is to try a can of valve seal additive to see if the problem temporarily goes away. Repair is the best option though.


26063798-uep1qeforvmfktksxbn30q5u-5-6.jpeg
Try a can of valve seal? It's worth a shot..

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ONE FOULED SPARK PLUG


Either worn valve guides, valve guide oil seals on that particular cylinder, or worn piston rings. You need to perform a compression test to find out which one of these it is.

Compression check each cylinder with all plugs removed. Take notes on which cylinder has the weakest compression.

If no compression difference and if all operating within range, then change the valve guide oil seals on problematic cylinder.

If the cylinder shows a significant drop in compression, then drop no more than five or six drops of oil down the plug hole of the problematic cylinder, and perform the compression test again. The oil will temporarily seal any worn piston rings, so the pressure should rise when retesting if the rings are worn. If the pressure remains low, then your valves are not sealing properly and require attention.

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If the fluid is engine oil ( most likely) then the seals on the spark plug tubes have failed. they are part of the valve cover gasket. If you don't fix it then the tubes can fill with enough oil to stop the sprark plug(s) from firing.

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We change the spark plug of my aveo 2004, and we found out that there is a oil leak on the third cylinder, what may cause the problem?


The valve cover has rubber o-ring seals that fit into the valve cover and seal oil out of the spark plug wells. Over time, they get hard and shrink, allowing oil to enter the plug wells from the top of the engine. You need to remove the valve cover and replace the valve cover gasket and o-ring seals. The seals should come with the valve cover gasket set.

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1 Answer

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Oil on spark plug


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Hi! This is not normal.What is happening,two of your cylinders are oiling.This is sign that your rings or your valve seals are bad.

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