Posted by Ken(Ark) on March 23, 2013 at 18:58:28 from (173.185.123.234):
In Reply to: Gasket sealant posted by Gustafson on March 23, 2013 at 13:09:56:
Silicon is usually used to fill small gaps , like the ends of the oil pan and timing cover gaskets .
Silicon will make cork gaskets slippery and squish out of place when the bolts are tightened .
Excess silicon can easily be pushed out . The stray silicon can either be sucked down the intake runner or if it is internal , then it winds up in the oil pick up tube screen .
There are probably more N's running without a screen since it is built into the drain plug and not the pick up tube like modern engines .
Not all silicon sealers are equal , the different colors are for different applications , don't know which is which though . Only one I use is the high heat copper on the exhaust .
Since you have it , I would smear a thin coat of #2 on the water pump gasket , I like Indian head shellac on water passage gaskets and heater hose nipples where applicable .
Most gaskets should seal without any sealer if the surfaces are clean and in good shape . Sealers are usually just insurance . Personally I don't want to take a timing cover off of a running motor because because it is seeping a little oil . I would just assume spend fifty cents on sealer and be done with it . Your motor , your call .
Never use sealer on head gaskets , unless it has a metal outer layer or the manufacture specifically calls for it .
Personally I like the Copper Coat spray because it applies an even thin tacky coat .
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