head gasket sealing problem

[Davidgx200]

Ordered a gx200 racing head milled .065 running 11.6:1 compression. Cant get to seal. Tried 3 different 0.009 gaskets, they all leak oil at the bottom of the head on the block. Just put a copper 0.018 gasket after riding today its leaking, dont really want to use the 0.040 gasket due to loss of compression any help would be appreciated.

 

[Bluethunder3320]

check the block surface and the head for flatness with a straight edge. also make sure the surface is clean as can be. my best guess is that either your block or head is slightly warped causing the bottom to not seal like you said.

 

[Davidgx200]

I made sure that it was clean and looks flat. Has anyone used any type of gasket maker successfully for a head gasket? Is so what kind i know black permartex isnt recommeded where gas is present

 

[fowler]

There won't be an issue with the gasket its just paper

Get a ruler and check the head

Are u using a torque wrench to tighten the head bolts?

 

[landuse]

I made sure that it was clean and looks flat

Looks flat, and "is" flat are 2 totally different things. Chech with a straight edge.

 

[r_chez_08]

If you want you could get some emery and a sheet of glass or marble. Stick the sheet of emery to the glaas or marble, then using a figure of 8 motion you can flatten the deck and head.
I heard the gx160 .045 gaskets seal well. Maybe try one, and if it works, get the head milled a little to up compression.

 

[OzFab]

Looks flat, and "is" flat are 2 totally different things. Chech with a straight edge.

i know black permartex isnt recommeded where gas is present

No sealant is recommended for head gaskets. Torque on the head bolts alone will seal it if both surfaces are flat

 

[Davidgx200]

Yes I'm using a torque wrench and torquing to 18ft lbs and haven't had a chance to take the head off and use a straight edge yet. The head is already milled 0.065 yea I know it should seal when torqued I was wondering if the high rpm and Compression may be the cause maybe an additional vent for the crankcase

 

[anderkart]

If all else fails, you could try this:--> http://www.permatex.com/products/au...r_Spray-A-Gasket_Hi-Temp_Adhesive_Sealant.htm

(edit)
I've gotten really good results by simply spraying a light coat of this product onto several types of automotive head gaskets (and water passage gaskets) on problem-jobs when nothing else would make a perfect/long-lasting seal! Just make sure you use a light-even coat, and then let it fully dry/cure before installing

 

[jfxwave]

Make sure you don't have the gasket to smooth. Here is a quote I found on this website.

Most gasket manufacturers say the surface should not be smoother than about 30 RA for most non-asbestos or graphite head gaskets because of these gaskets’ lateral support from the head and block.



When the head is bolted to the block, the metal on both sides bites into the gasket to help hold it in place. You don’t want too much bite when the head is aluminum and the block is cast iron because of the sideways shearing forces that result from the expansion and contraction of the aluminum head. Yet, a certain amount of support is necessary to keep the combustion gases in the cylinders from distorting the gasket and blowing past it.



This is especially critical in the areas with narrow lands and between the head bolts where there is nothing to keep the gasket in place but the gasket itself. In high output or heavy-duty applications where combustion pressures exert even greater force against the head gasket, a surface finish that’s below the minimum smoothness spec might lead to premature gasket failure.

 

[Doc Sprocket]

high rpm and Compression may be the cause maybe an additional vent for the crankcase

Won't do you any good. Wrong side of the piston...