Yanmar Injector Removal Picture

[nico105]

Originally Posted by endoftheroad

This leads me to not believe that sealant isn't necessary as some suggest,

You are correct in this assumption. unnecessary. the heat is the sealant. new head gasket w/ the head reinstall.
you've prob got this all figured out by now. good luck just the same. David

[endoftheroad]

Originally Posted by nico105

You are correct in this assumption. unnecessary. the heat is the sealant. new head gasket w/ the head reinstall.
you've prob got this all figured out by now. good luck just the same. David

Sorry,

My statemant was confusing.

I meant to say that some suggest that zero sealant is suitable for the threaded fittings but when the assembly is filled with gasoline the petro seeps through the threads.
My conlusion, at this point because so many here are uncertain, is that a sealant is needed.

You say "heat is the sealant"

Don't we heat tight connections to get them loose?

[nico105]

my initail respose was concerning a sealant for an exhaust elbo. the heat of the exhaust in the elbo swells the elbo and seals the elbo connects...in reguards to the heating for the loosening of a siezed up connection, the swelling of the steal at the connection, more than likely will help speporate the individual parts. My appologies for any added confusion, these are things that have worked for me on the Nico. David

[endoftheroad]

Originally Posted by endoftheroad

Yanmar doesn't require sealant on the head gasket.

But maybe they base this on a perfectly machined head.
This is not the case with my head.

I would like to use some sealant.

Any suggestions?

UPDATE;

GOOD and BAD,

The good is that I got it all back together with my new injector and she runs like a bear. No more black soot caused from my old injector.

The BAD is that the head gasket is liberally leaking sea water after about 15 mins running. I have great compression as motor starts up perfectly and runs great.

I did NOT use any sealant on the gasket as I couldn't get any information to do so.

What to do?

[PamlicoTraveler]

Permatex Ultra Copper Maximum Temperature RTV Silicon is what I would use

[endoftheroad]

Originally Posted by PamlicoTraveler

Permatex Ultra Copper Maximum Temperature RTV Silicon is what I would use

Permatex 81878?

Hylomar was recommended on another forum (85249).
The Hylomar website calls for it's use on Head gaskets.

I like them both, I must choose the one that will seal my scratched block surface as removing it from the boat is not an option.

Thanks

[endoftheroad]

My mechanic suggested more torque and it sealed the gasket.

I am running like new again, now I can get in and out of this cove against the currents so I can do more sailing.

That black soooty water caused from my old injector (that was siezed inside the head) was a bother for about 10 months.
The motor would start and run great but couldn't do much under load.

Thanks everyone.