Question about Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: head gasket sealant
As a A S E Certified Tech I Do NOT RECOMEND ANY "QUICK FIX" ADDITIVES Especialy for such a Critical Engine Component
More Costly but Also More effective is to Tear down Engine and Replace Head Gasket as You may have A Cracked Head Or Block That NO ADDITIVE will TRUELY REPAIR PROPERLY
Rough Estemate In USA Midwest $350.00-$600.00 For The Real FIX yep they vary that wide Some of us Love Helping PEOPLE the Rest LOVE THE MONEY MORE
Posted on Jan 14, 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
1.9L SOHC - head gasket set which includes all gaskets needed to remove cylinder head with thermostat runs about $150.00. Head mechine ( check for cracks and milled ) $145.00. Labor time to remove and reinstall cylinder head 8.5 hrs X shops labor rate.
1.9L DOHC - head gasket set and thermostat runs about $210.00. Head mechine $175.00. Labor to remove and reinstall cylinder head 10.7 hrs X shop labor rate.
Labor times per Mitchell labor book, this is a guide all repair shops used.
Posted on Jan 12, 2010
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