SOURCE: 1994 Toyota Corolla - Valve COver Gasket Replacement
You need an aftermarket serviice manual from Haynes or Chilton.
They will have that kind of info.
I know of no car (I don't know them all) where that is needed and depending on the cover material (sheet steel or cast), could lead to warping and new leaks.
I always use a thin film of silicone whether it is specified or not and there are torque specs for ALL valve covers I have ever seen.
SOURCE: head gasket on my 1990 toyota V6 3.0
I would highly recommend that you go to the local parts store and purchase a Haynes Manual for your vehicle, they are around $ 25.00 Canadian. As when you do your head gasket you wil need to remove your timing belt and this is a procedure in it's self. then you will neen certain torque settings. This manual will provide you with all of this information step by step. they are designed for the do it yourselfer. They also cover many other issues that you may come across through out the ownership of your vehicle. I know that the last ting you need is an added exspence but these manuals are well worth the small investment. There is a site that you can find hrough google search that you can find factory service repair manuals for your vehicle, however they only have a layout for a 4 cylinder engine in there drawings and this is alot different then the 6 cylinder. As the procedure for repairs is totally different. I hope that this helps and that you take the time to rate any solutions you receive. Good Luck.
SOURCE: 1992 Toyota Previa van,Oil dripping onto exhaust manifold, replace head gasket? need a free manual!
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.
SOURCE: toyota ep71 starlet 1988 - 5spd manual trans
The Corolla gearbox has a longer tailshaft than the Starlet and the gearstick is in a different place, you may be able to fit with a modified driveshaft and a new hole in the floor , the starlet 5 speeds were a little fragile and prone to doing bearings. I would recommend rebuilding the one you have as it will probably be less hassle and cheaper.
SOURCE: 1996 Toyota Corolla Valve Cover leaking oil
i have a 1996 1.3 toyota corolla and i changes my roccer cover off a glanza turbo and my car leaked oil we changed the gasket but still seemed 2 b leakin a small bit we also put on gasket sealer now the car is not leakin oil but the oil light is commin on only when the car is under 1000 rpm does any1 no wat is worng with it?
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