Question about 1992 Toyota Previa

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1992 Toyota Previa van,Oil dripping onto exhaust manifold, replace head gasket? need a free manual!

1992 Toyota Previa van, replace head gasket

Posted by jsuper46 on

  • Håkan Sterner May 11, 2010

    To me this sounds like you actually mean that the valve cover gasket might need to be replaced which is far easier and less expensive than replacing a head gasket. If this gasket is leaking you may get oil dripping out of the engine as you say.

    What symptoms have you observed other than the external oil leak that lead you to believe you need to replace the head gasket?

  • Imax
    Imax Jan 20, 2014

    It is wet in that area also I can see from above the oil pan cover



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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

  • guyinseattle Sep 13, 2016

    Update (guyinseattle) - Valve cover leaking oil again. I took the valve cover off and added a bead off silicone sealant around the entire periphery and let it sit for 5 minutes to cure. I then installed the valve cover and tightened the bolts finger-tight to squeeze out the silicone and let it set. After 60 minutes, I tightened the valve cover per specification. No leaks so far (Sept 2016 - 1991 Previa with 360k miles so far)




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Our family -- same problem. I have a '91 (435,000 miles), dad's '95 (160,000 miles) both leaked almost profusely. There are 2 major reasons for these leaks. 1) As mentioned above, the valve-cover bolts (actually 6mm - with 10mm head) are too long after years of pulling the gasket tight. a couple washers under each will get you on the 'road to recovery' with this issue. 2) Next if not replaced with the valve-cover gasket, replace the distributor O-ring. This is more easily done at time of VC gasket replacement. And, "yes", use the Toyota silicone. gasket sealer. NOTE: It is ABSOLUTELY recommended that you DON'T use a heavier grade oil, northern climes or not, than that specified (5W30). See (Search: Ferrari Chat Oil)

Posted on Sep 27, 2011



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You will need a new head the block is bomb proof consider a second hand engine also consider the cost and value of the car

Posted on Jul 14, 2009

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2 Answers

The compression is the same for all cylinders(150), but when I turned motor over, water came out of #1 cylinder only. Any idea?

Sounds like a head gasket leaking water in from the cooling system. Does it run OK? Any water in the oil on the dipstick and a mayonnaise type film on the oil filler cap?

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Check the oil on your dipstick. If there's a greyish/cream sludge - sometimes referred to as 'mayonnaise' - this points towards coolant entering the oil system via a leaking head/head gasket.

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Jan 21, 2016 | 1992 Toyota Previa

1 Answer

Numbers for re-tensioning head gasket bolts on 2002 toyota hiace van

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1 Answer

My toyota vienta 3VZ-FE 1996 - oil leak onto exhaust


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1 Answer

Is replacing the head gaskets on a 1992 eldorado a diy, replaced the sensors temperature is still hot 192-228

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1 Answer

1991 Toyota Pickup Leaks oil

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Sep 18, 2008 | 1991 Toyota Pickup

2 Answers

1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse

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Take the head back to the machine shop & tell them to fix it. For free.

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