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water in intake manifold

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tomstractor
5+ Years
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Joined: Mon Sep 04, 2017 11:12 am
Zip Code: 01007
Tractors Owned: 49 Cub,57Cub, 57 Low Boy, 48 BN, 48 Ford8N, 49Ford 8N, 56 Massey Harris 50, 58 MF 65, 77 MF 265
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Location: Belchertown, MA

water in intake manifold

Postby tomstractor » Thu Apr 22, 2021 9:42 am

My new rebuild of my 58 cub has water (antifreeze) leaking a little around at the block to head surface. It also has
water leaking out of the intake manifold. I took the manifold off and water is leaking out of the 3/4 manifold intake port.
Removed the head and all looks fine that I can see. Is this a crack in the block at the valve? Has anybody seen this problem? This was a basket case that I put together. Bored 30 with all new valves and guides. :help:
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tomstractor
5+ Years
5+ Years
Posts: 129
Joined: Mon Sep 04, 2017 11:12 am
Zip Code: 01007
Tractors Owned: 49 Cub,57Cub, 57 Low Boy, 48 BN, 48 Ford8N, 49Ford 8N, 56 Massey Harris 50, 58 MF 65, 77 MF 265
Circle of Safety: Y
Location: Belchertown, MA

Re: water in intake manifold

Postby tomstractor » Thu Apr 22, 2021 9:45 am

Also checked the head and it is very flat. I have a pro straight edge and no warpage.
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tst
10+ Years
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Zip Code: 12514
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Re: water in intake manifold

Postby tst » Thu Apr 22, 2021 9:46 am

I used heat to warm up a suspected crack area and it worked, when it got hot it expanded enough to find the crack
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Eugene
Team Cub Mentor
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Location: Mo. Linn

Re: water in intake manifold

Postby Eugene » Thu Apr 22, 2021 9:57 am

Head removed. Dry the valve seat area and top of block. Add water to the engine block/radiator to about 1/16" below the top of the block.

Since the leak shows up with a cold engine, the "crack" area should show up as a damp spot.

Another thought. Head bolt threads in block tapped/cleaned?
I have an excuse. CRS.
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tomstractor
5+ Years
5+ Years
Posts: 129
Joined: Mon Sep 04, 2017 11:12 am
Zip Code: 01007
Tractors Owned: 49 Cub,57Cub, 57 Low Boy, 48 BN, 48 Ford8N, 49Ford 8N, 56 Massey Harris 50, 58 MF 65, 77 MF 265
Circle of Safety: Y
Location: Belchertown, MA

Re: water in intake manifold

Postby tomstractor » Thu Apr 22, 2021 10:07 am

All headbolt threads were cleaned and sealer used on threads. I will try the water test when I take the head back off.
Thanks
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SamsFarm
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Re: water in intake manifold

Postby SamsFarm » Thu Apr 22, 2021 10:59 am

Well, I hope you do not have any cracks!

And it was just a defective head gasket!
1968 Cub Fast-Hitch
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