Question about Cars & Trucks
Could be the gasket or the head has come lose, check the torque of the bolts. if has come loose and it is not lost that much oil it should be ok just to re-adjust the bolts back to the propper torque
Posted on Oct 15, 2013
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Posted on Jan 02, 2017
SOURCE: Jeep Wrangler leaking coolant
IT IS THE WATER-PUMP. PLEASE DON'T WAIT FOR IT TO OVER-HEAT BECAUSE THEN IT WILL BE TOO LATE, AND VERY COSTLY. PRICE A HEAD-GASKET JOB AND COMPARE IT TO THE COST OF A WATER PUMP. HOPE THIS HELPS YOU MAKE THE RIGHT CHOICE. BEST OF LUCK.
Posted on May 02, 2009
The toyota previa uses a formed silicone gasket for the valve cover and the cover is held in place by metric shoulder bolts ( 10mm). The valve gasket leaks because you can't get enough preload on the bolts to re-seat the old gasket when it gets old and shrinks. The shoulder bolts only allow you to tighten the gasket enough to seat the shoulder on the bolt. If you continue to torque down the suspected bolts, you will snap the bolt off ( don't ask me how I know this ). You can either 1.)replace the old gasket with a new one or 2.) remove the existing bolts around the leak area and put in new metric bolts that do not have a shoulder. You may want to put in a small sleeve into the existing bolt hole but shorter than the thickness of the valve cover to account for the smaller diameter bolt. You can now torque down the bolt and get enough preload to seal the valve cover without removing the old gasket. Make sure you use a torque wrench ( in-lbs) or be very careful not to snap these small valve cover bolts.
Posted on Jul 15, 2009
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