Gasket sealant

[JimSraj 430]

What kind of gasket sealer do you all use for oil pan, fuel pump, valve cover and cam gear cover?  Apply to one side of gasket or both?

 

[kpinnc 12,083]

Permatex makes multiple versions of gasket sealer for different applications. Set time seems to be the primary difference, as well as strength. Most silicone will tolerate high temps and remain flexible. 

 

Personally, I use the orange silicone in about everything except the head gasket. Just keep in mind that it just helps fill tiny imperfections between the two surfaces and gasket. It isn't strong enough to replace or repair a gasket. 

Edited December 28, 2021 by kpinnc

[squonk 41,150]

If I'm gluing a gasket in place Permatex High Tack Sealant. If I just want to seal an irregular surface Permatex Aviation Gasket Sealant.

[Gregor 4,846]

21 minutes ago, squonk said:

Permatex Aviation Gasket Sealant.

But don't plan on reusing any gasket you put this stuff on. 

[AMC RULES 37,130]

[pfrederi 17,741]

Do not use RTV Blue orange black whatever on a hydro.  Little tiny bits that squeeze out on the inside can come loose and if you ever looked at Sunstrand hydro acceleration valve ports it doesn't take much to plug it up.  Have found it in Hydros I have worked on..  Even Pros have issues.  When I tore down my MAGNUM 18 Kohler use adhesive between case half's and Jugs to case.  Found bits of it inside some of the small spaces made by casting ribs.    Doesn't really affect an engine as there you do not have the tiny passages of a hydro.

[WHX?? 48,828]

21 minutes ago, AMC RULES said:

gets my vote.  The Dino suggested it years ago on three piece trannys. Picked up a tube and never looked back. 

 

Hydros never anything because of what Paul said. They leak abit so be it. Park it on the gravel to keep the dust down. 

Edited December 28, 2021 by WHX??

[pfrederi 17,741]

6 hours ago, kpinnc said:

 

 

Personally, I use the orange silicone in about everything except the head gasket. Just keep in mind that it just helps fill tiny imperfections between the two surfaces and gasket. It isn't strong enough to replace or repair a gasket. 

 

 

So I guess this wasn't your handiwork?

[squonk 41,150]

I remember years ago replacing a head on a Chrysler 2.2 Turbo. Some manifold studs went into the waterjacket. After getting things all together antifreeze weeped out of the studs. Thread sealant didn't help. I had to coat the studs with RTV even though nothing was on them from the factory. 

[stevasaurus 22,764]

That Yamabond #4 is what Brian @buckrancher used on a 2 piece gas tank and did not use a gasket.  Personally, I do not like to use any sealer on gaskets...especially on a Wheel Horse transmission.  The factory did not use anything, and if I can get it clean, I don't either.  

   Now, as far as needing something to hold a rocker cover gasket in place, I like Copper Coat.  It's sticky, fast, and it is just a light, smooth coat.  I don't use anything on head gaskets, thermostat gaskets, carburetor gaskets or any other gaskets you can think of.  I always hate when I am the next guy to remove something.    

[squonk 41,150]

On a small block Kohler, the only gasket I glue is the oil pan gasket to the pan itself. The pan has those thin side rails and it's very easy for the gasket to slide off and into the pan when assembling it to the block.

[pacer 3,173]

I'm with @squonk  and @stevasaurus I use very little sealant - pan and valve cover come to mind, definitely not on the head & carb gasket. If the part wants to move around when bolting down, I'll put a thin coat on.

 

 

[JimSraj 430]

Thanks to all who offered experienced options. 

The reason I asked is that I’ve recently got to fire up the K301S that I rebuilt(first ever).  After some initial gas tank valve leaks and leaks between the upper and lower parts of a new fuel pump that I did get sorted I discovered oil leaks from the valve cover and possibly from 1 corner of the oil pan gasket. Might be one from the cam great cover too. Can you imagine, some novice used blue permatex on all of them. Well now that guy gets to take it all apart again to install new gaskets. Seems most opinions are no sealant or only Hi Tack if there is a gasket between the parts. 

I guess experience is the best teacher. 

[WHX?? 48,828]

2 hours ago, stevasaurus said:

.especially on a Wheel Horse transmission.  T

Tranny for the 701 I didn't Steve.... and it leaks....  Right on the bottom & not a great lot but it ain't coming back apart. Park it next to the Harley and let her leak.

Surfaces were as clean as a whistle too and I hand filed nicks and burrs flat from the last guy that was in it. 

Like Squonky I do use this once in awhile.

https://permatex.com/products/gasketing/gasket-sealants/permatex-high-tack-spray-a-gasket-sealant-6-oz/

 

Anybody use this?? Used to be the go to for old skool mechanics.

https://www.amazon.com/Permatex-20539-Indian-Shellac-Compound/dp/B0008KLOG6/ref=asc_df_B0008KLOG6?tag=bingshoppinga-20&linkCode=df0&hvadid=80333120120295&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583932699546844&psc=1

[kpinnc 12,083]

4 hours ago, pfrederi said:

So I guess this wasn't your handiwork?

 

Eewwwww no that wasn't me!

 

That's funny. Oh well that question got answered: it stands up to the heat of the heads no problem.

[squonk 41,150]

55 minutes ago, WHX?? said:

Tranny for the 701 I didn't Steve.... and it leaks....  Right on the bottom & not a great lot but it ain't coming back apart. Park it next to the Harley and let her leak.

Surfaces were as clean as a whistle too and I hand filed nicks and burrs flat from the last guy that was in it. 

Like Squonky I do use this once in awhile.

https://permatex.com/products/gasketing/gasket-sealants/permatex-high-tack-spray-a-gasket-sealant-6-oz/

 

Anybody use this?? Used to be the go to for old skool mechanics.

https://www.amazon.com/Permatex-20539-Indian-Shellac-Compound/dp/B0008KLOG6/ref=asc_df_B0008KLOG6?tag=bingshoppinga-20&linkCode=df0&hvadid=80333120120295&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583932699546844&psc=1

Jim the InJun shellac is very similar to the aviation sealant. Napa # 765-1229   

  765-1210 

[stevasaurus 22,764]

Jim, those 3 piece transmissions can be a bear.  The problem is, most of them have been like you would throw them out in the 1st place.  Now you try to save it.  I almost always end up taking it back apart at least once...that is why I do not like to use sealant on the gasket.  Sometimes the side plates need a little love with a BFH.  I have never had to use sealant yet on one of those...gee whiz...there are 9 bolts on each side, like 3" apart.  I would rather put 2 gaskets on the bad side then use sealant.  Actually, I was cutting my own gaskets...the material might have been thicker by a touch.  

   Just a thought on those 3 piece transmissions...the 5003 & 5010,   They come off as a sloppy transmission, but I can tell you that you need to have those gaskets in there.  I tried to use Yamabond  #4 on one (without a gasket) and it closed so much that it jammed the gear shafts.  Those silly millimeters do make a difference.  Gasket cement plus the gasket could make the transmission sloppy.    Something to think about.  Sooo...pour a Rock & Rye and sit down and look at the situation...do not be afraid to take a trans back apart to check something out that just does not seem right.  Put a straight edge on the casting and side plates and see if they need that little bit of love with that BFH.