To gasket or not to gasket, that is the question. - JeepForum.com
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post #1 of 29 Old 08-13-2020, 07:13 PM Thread Starter
Horatio
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To gasket or not to gasket, that is the question.

1980 258. The TSM provides instructions for both a gasket method and an RTV only method. I currently have a leaking cork gasket. Is anyone using only RTV with success?

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post #2 of 29 Old 08-13-2020, 07:47 PM
Wabatuckian
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20 years ago, I never had much success with silicone on my CJ. Today, I might consider some of the new offerings.

However, I'd most likely still go with a gasket.

Josh
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post #3 of 29 Old 08-13-2020, 08:00 PM
4Low2G0
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what gasket are we working on? Valve cover?, I go with the gasket and some sealer, don't
over tighten or you'll crush the gasket and have leaks.

also be sure the cover has a good flat mounting surface. you may have to work it flat again where the bolts go.

Whats over that next ridge?
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post #4 of 29 Old 08-14-2020, 12:05 AM
ddawg16
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It would help to say which gasket. But I'm going to assume you mean the valve cover.

No gasket....RTV

This is what worked for me.....

1. Take apart. Clean everything real well.

2. Using Black RTV, run a 1/4" bead of RTV (silicone) around the edge of the valve cover.

3. Real important.........wait at least 30-45 min until that bead is tack free (it doesn't stick to your finger)

4. Carefully place into position. Gently snug the nuts. SNUG!!!!!!!!!!

5. Real Real Real important...........grab a few beers and relax for the evening. Don't touch it. You need to let the RTV cure.

6. Now you can tighten the nuts down

You now have a perfectly formed gasket. It has worked well enough for me I could remove the valve cover and put it back down and it didn't leak.
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post #5 of 29 Old 08-14-2020, 01:47 AM
80cj
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On valve cover and rearend I use gaskets with Permatex aviation form a gasket. No leaks.
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post #6 of 29 Old 08-14-2020, 05:42 AM Thread Starter
Horatio
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Quote:
Originally Posted by ddawg16 View Post
It would help to say which gasket. But I'm going to assume you mean the valve cover.
Yep, sorry folks. I'm doing the valve cover.

ddawg, thanks for your instructions. I think I'm going to give this a shot. I'm also considering using Nord-lock washers.
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post #7 of 29 Old 08-14-2020, 07:50 AM
bob4703
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Consider no other gasket than a Felpro. Tighten in stages and never over torque. Check the tightness of the bolts after a few weeks.
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post #8 of 29 Old 08-14-2020, 11:25 AM
verreaul
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I used Permatex The Right Stuff on differential covers and plastic valve cover.
Differentials are going on 3 years with no leaks and I just did the valve cover in the spring (also no leaks to date).
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post #9 of 29 Old 08-14-2020, 11:39 AM
JEEPFELLER
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Valve cover?

A nice even and thin coat of RTV on the gasket.

Install gasket on valve cover.

Use clothes pins to hold the gasket in place.

Make the clothes pinning resemble thirsty cattle around the water hole, and none of 'em will let one more in beside them!

Once the RTV is dry, apply another coat to the bottom side and install the cover on to the head.

I have one more observation you don't wanna see yourself (I already done it for you!).

If you put RTV on both sides and install it (without one side drying first) As you snug the bolts down, the RTV is so slick it will allow the gasket to suck under between the bolts----it will leak!

If y'all would like to hear and see a horror story of "Gobbing" RTV on drive train stuff, I'll be glad to take the time to show you that! I seldom use RTV, It does have it's place. I categorize gaskets as "Squishy" or "Non-Squishy". I might use this on either type. For sure, on the "Non-Squishy", 99% of the time I use "GASKET SHELLAC" (Indian Head [brand]) on things like the timing chain cover gasket/ the fuel pump gasket/ water pump gasket/ yes, even intake and exhaust manifold to the head and to the carburetor/ and lots more.

Back to the horror story!

I use the Gasket Shellac on the gaskets for the tranny and the shift assembly/ covers on the transfer case/ the covers on both differentials

A few years back, I found that the previous owner had Gobbed RTV on the transfer case cover.

I found it way too late!

I snatched the tranny out for a rebuild, My plan was to do the transfer case later. I set it off to the side.

I perfectly replaced every part inside the tranny--100% perfection!

I reinstalled it and the transfer case.

Five miles down the road and at 55 MPH later, the rear of the Jeep locked down and I began sliding sideways. I was saved by my "cat-like" reflexes.

OK, I'll speed through what happened.

I must have stirred up the "GOBs" of RVT in the bottom of the case when It was off.

The GOBs got into the rear bearing cap and closed off the oil holes to the rear bearing (this is the cast iron part that the yoke comes out of the transfer case)

The bearing starved and locked down, the torque from the 55 MPH driveshaft snatched the seized rear bearing cap and this torqued the case and cracked it too.

Everything in the cap was cooked and broken, like the speedometer stuff.

Winter time/ funds were scarce/ her rig lost it's tranny/ Now "Mr. Jeep" was down/ All that was left was "Willy"!

See us in here! https://www.jeepforum.com/forum/f8/r...-area-4323145/

Sorry my pics are not in order.

If y'all had been there,

You coulda watched me cry like a little girl.

----JEEPFELLER
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BREAKAGE 012.jpg  
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post #10 of 29 Old 08-15-2020, 07:37 AM
Matt1981CJ7
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Another vote for The Right Stuff by Permatex, with no gasket.

Matt
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post #11 of 29 Old 08-15-2020, 09:43 AM
oldschool74cj5
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hello

i used a mahle gasket with the metal shim in between the two pieces of cork. being in aviation i used a thin coating of permatex aviation gasket make on both sides. then made sure to torque all the bolts. the nice thing about the aviation gasket maker is it cleans off with alcohol or other cleaners pretty easily. it dries but never truly hardens.

oldschool
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post #12 of 29 Old 08-16-2020, 06:22 AM Thread Starter
Horatio
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Quote:
Originally Posted by Matt1981CJ7 View Post
Another vote for The Right Stuff by Permatex, with no gasket.

Matt
I'm going to give this a shot. Doing some Amazon shopping I found a couple different Permatex options:

Permatex 27037 Optimum Black Gasket Maker

and

Permatex 25228 The Right Stuff 90 Minute Gasket Maker

Why The Right Stuff over the Optimum Black?
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post #13 of 29 Old 08-16-2020, 06:35 AM
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Quote:
Originally Posted by Horatio View Post
Why The Right Stuff over the Optimum Black?

For me, it was because my FLAPS carried the Right Stuff in stock, but not the other stuff.

Matt


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post #14 of 29 Old 08-16-2020, 06:46 AM Thread Starter
Horatio
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Quote:
Originally Posted by Matt1981CJ7 View Post
For me, it was because my FLAPS carried the Right Stuff in stock, but not the other stuff.

Matt
Had to look up FLAPS!

Found a comparison chart. Think I'll give the optimum black a shot.

Permatex.pdf
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post #15 of 29 Old 08-16-2020, 07:12 AM
cjoffroad
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The right stuff, as I understand it, has the ability to be torqued and put into use right away... as the others need to setup before
Attached Files
File Type: pdf Right Stuff TDS.pdf (38.3 KB, 8 views)
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