Leaking head gasket

The Cub Club -- Questions and answers to all of your Cub related issues.
Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
Cubbuilder
Posts: 21
Joined: Sun Oct 17, 2021 7:01 pm
Zip Code: 54456

Leaking head gasket

Postby Cubbuilder » Sun May 14, 2023 3:03 pm

Hello everyone. Did a full restoration on my 1958 cub and have had a problem with leaking head gaskets. Replaced three times after overhaul and still find moisture when the tractor is cold. After warm up its fine. Head was rechecked the last time to ensure its flat and block was checked for cracks, re decked ect. Cannot find a reason why it has moisture coming out of the exhaust when starting which smells like anti freeze. Are these head gaskets not very well made these days? also used copper gasket every time with no success. Any thoughts on this?

SamsFarm
501 Club
501 Club
Posts: 1853
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
CS Bell No. 60 Grain Mill on a unmodified Fast Hitch Disk hitch prong
Home Made Fast Hitch Potato Plow
54A Blade

Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
Cub-189 Two Way Plow
Cub-22 Sickle Bar Mower
Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)

Misc Belly Mowers

Wish List
International 100 Fast Hitch Blade
Mott Fast Hitch Flail Mower

Wish Wish Wish List
Fast Hitch Rotary Hoe
4E hammer mill
Location: Ne Ohio

Re: Leaking head gasket

Postby SamsFarm » Sun May 14, 2023 4:27 pm

Did you use a Felpro head gasket?

Cubbuilder wrote:still find moisture when the tractor is cold.

Could you define that "moisture"?


Cubbuilder wrote: Head was rechecked the last time to ensure its flat and block was checked for cracks,

Was the head checked for cracks?


Cubbuilder wrote:Cannot find a reason why it has moisture coming out of the exhaust when starting which smells like anti freeze.

Did ypu apply sealer to the head bolt threads?

User avatar
Glen
10+ Years
10+ Years
Posts: 6255
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Leaking head gasket

Postby Glen » Sun May 14, 2023 4:35 pm

Hi,
If you meant you used copper gasket spray, it should be put on as you are putting the head on, so the spray is wet. Don't let it dry before putting the head on and torqueing the bolts.

The head bolts need sealer on the bottom 1" of their threads, the head bolt holes go into the water jacket. Coolant can run up the bolt threads and leak out when there isn't sealer on the threads.
You didn't say if you put sealer on the bolt threads.
If you didn't use sealer, I would put sealer on them.
Antifreeze leaves a sticky film on metal, the metal should be bare so the sealer seals well.
Wash the antifreeze off the threads with water, like a garden hose with a nozzle, before putting the sealer on.
For the threads in the engine, drain the coolant, leave the drain plug out, and remove the head bolts, before removing the head, wash down the bolt holes with the nozzle, and let the water run out the drain hole.
That should keep all or most of the water out of the cylinders, if water got in any cylinder dry it with paper towels, and use compressed air to dry it, and air down the bolt threads to dry them. Dry the bolts too.
Wear your eye goggles when using the water and air.

I use Permatex Aviation Form A Gasket sealer, it is a non hardening liquid. They sell it at auto parts stores. If you buy one, stir it before use, it can settle in the can sitting.
Below is a picture.
After putting the sealer on, I would let it sit for a day before putting coolant in, so the sealer can harden some. Don't run the engine without coolant.
If it still has a leak after putting the sealer on, the engine might have a crack somewhere.
Attachments
Cub Permatex.jpg
Cub Permatex.jpg (8.51 KiB) Viewed 182 times
Last edited by Glen on Mon May 15, 2023 4:21 pm, edited 1 time in total.

cdahl383
Cub Star!!
Cub Star!!
Posts: 291
Joined: Wed Mar 22, 2023 8:01 pm
Zip Code: 48162
Tractors Owned: 1949 Farmall Cub

Re: Leaking head gasket

Postby cdahl383 » Sun May 14, 2023 8:02 pm

Is it low on coolant after using it?


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Majestic-12 [Bot] and 1 guest