I have a 1992 toyota previa 2.4L mini van. It is NOT 4-wheel drive nor is it S/C. It has automatic windows.
Looks like I have a head gasket problem. For a long time, during the cold start, lots and lots of white smoke comes out of the tail pipe, but the engine ran fine. Than, the car started struggling, hesitant and also felt as if there was a crack in the ditributer cap. I had my mehanic change the spark plugs and dist. cap/rotor. He said he also did compression test and readings were 115 on two pistons and 90 on the other(the two middle ones). After the tune up the car ran very good but the mechanic said, probably there is leak from the head gasket. After driving the car just a few times after the tune-up, I did not drive it for 3 weeks. When I tried to start it after 3 weeks, it took severall times of trying to get it started. Once it started, I noticed lots of coolant was coming out of the muffler pipe. It definetaly sounds like head gasket problem right? The car is still in drivable condition for now. I just have to add coolant/water one quart every two hunred miles or so.
My question is, instead of having the head gasket repair which is costly(I don't really want to spend that much money on it) how well does steal-seal works? Has anyone have any experience with that chemical?
Re: I have a 1992 toyota previa 2.4L mini van. It is NOT...
I have bought Toyota Previa 2.4L mini van. It is not four wheel driev nor is it S/C. it has automatic windows.
My problem is the operators/owners manual is in German language. Could you please as a matter of urgency furnish me with the English version type on pdf transmission to my mail box.
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www.toyotavantech.com > Forum > Technical Discussion > Toyota Previas
Dec 3, 2011 - 20 posts - ‎2 authors
Okay, so you've got a Toyota Previa with a blown head gasket. ... The next few pix are taken after dropping the engine out from the bottom using a ... You can see a definite path between the water jacket and the cylinder. ... I believe this was a result of #1blowing and over pressurizing the cooling system.
- Check the radiator cap for proper sealing.
- Blow air from outside and inside of the radiator to clean the fine dust accumulated in the feathers and fins.
- Check the radiator for clogged inside. Clean the radiator after disassembling it.
- Check the water pump belt for looseness or wear.
- Check the thermostat valve.
- Check the cylinder head gasket or re-torque the cylinder head bolts.
There are several likely causes, none very rosy:
1) head is warped (was it surfaced and/or straightened in conjunction with the new head gasket?).
2) gasket damaged during installation.
3) head is cracked.
4) block is warped and/or cracked.
If you are committed to the car I'd recommend finding a re-manufactured head from a quality supplier and have it professionally installed. That covers 1 -3. #4 is very difficult to access without removing the engine from the car and taking it apart and having it magnafluxed. The only sure thing is a complete engine with a warranty. Cost of the reman engine is probably in excess of the value of the van.
Good luck
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.
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