Replacing the Head Gasket - Sealant? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 12-22-2006, 07:11 PM Thread Starter
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Replacing the Head Gasket - Sealant?

After cleaning up the front cylinder on Orleans, I still wasn't sure about the head gasket and decided to replace it anyway. MIght as well do it while I've got access. There seem to be a couple of gasket sealants "out there", however, and I was wondering if someone could point me in the right direction (which might include steering away altogether). There's the red RTV sealant which appears really to be a gasket maker (like for an oil pan); then there's some blue stuff, which seems more sealant-y. And then there's just the "coat it with oil, put it where it's supposed to go, and put the cover back on the cylinder." Anyone have suggestions?

C
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post #2 of 23 (permalink) Old 12-22-2006, 07:25 PM
 
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Cindy if memory serves me right (lol yeah right) I believe the red rtv is the high temp and the blue is mid heat range, I would say the red would hold up longer personally but lets wait for a second opinion...theres always indian head gasket sealer
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post #3 of 23 (permalink) Old 12-22-2006, 07:31 PM
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I don't know about the 750 but I've never used sealent on a head gasket.

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post #4 of 23 (permalink) Old 12-22-2006, 07:46 PM Thread Starter
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Quote:
Originally Posted by TrashLord View Post
Cindy if memory serves me right (lol yeah right) I believe the red rtv is the high temp and the blue is mid heat range, I would say the red would hold up longer personally but lets wait for a second opinion...theres always indian head gasket sealer
What memory? Who are you?? Ha ha. The red is definitely the high temp, but i actaully saw no traces of any sealant when I pulled of the existing gasket. Given the oil leak, I thought, "Well, maybe they should've put something there," so I thought I'd better ask. I'm also replacing the o-rings on the spark plug retainers (which is the area most likely the source of the leak), so between the two, that engine oughta be good and sealed.

C
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post #5 of 23 (permalink) Old 12-22-2006, 07:55 PM
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You don't use any sealent on headgashets. I never have on all the motors I have built over the years.

Chad Falstad "Hawk"
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post #6 of 23 (permalink) Old 12-22-2006, 09:16 PM Thread Starter
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Works for me, then. I'll just go drop that one on, bolt 'er up, and call it a new head gasket.

Out of curiosity, though, when do you use sealant? Clutch gaskets? Uh..I'm trying to think where else we have 'em.

C
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post #7 of 23 (permalink) Old 12-22-2006, 09:52 PM
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You use sealent on rubber gaskets, like the valvecover. I would put some in the corners where it goes over the cam lumps and in the half moons.

Chad Falstad "Hawk"
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post #8 of 23 (permalink) Old 12-22-2006, 10:21 PM
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The headgasket requires no sealant. The only time I have used a sealant on the head area is when I was trying to get a little more horsepower. No gasket and surfaces sprayed with coppercoat then bolted togather wet. It raised compression but did nothing for reliability. It usually "blew" in a few short hours(sometimes laps) and made tear down much harder.

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post #9 of 23 (permalink) Old 12-23-2006, 08:42 AM
 
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If you are just doing the head gasket and not splitting the crankcase, the only place that you should need any sealant would be a small amount on the half moons of the valve cover. I use a product called "the Right Stuff". It has some type of fiber in it and isn't as slippery as RTV.
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post #10 of 23 (permalink) Old 12-24-2006, 09:48 PM
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There are two gaskets on the cylinders of our bikes. One is a metal gasket that is coated with a sealing material. This one requires nothing, the other one is a standard paper gasket. I used plain old Permatex on mine and have had no problems at all.
One word, be careful when torqueing down the smaller head bolts. Even with a torque wrench and well before I reached the recommended torque, I managed to snap one off and had to disassemble the head to get the stump out. It just "felt wrong" while I was tightening it. You will notice it if you ever snap a bolt off that while tightening, it just doesn't feel normal. That's about the only description I can give but those who have experienced this will know what I am talking about.

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