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Antifreeze Leak 235 6 cyl Chevy
#1377359 Wed Sep 16 2020 11:15 PM
Joined: Jul 2016
Posts: 19
5
New Guy
I am getting less than a thimble of antifreeze dripping on the floor under my 1959 Chevy PU. I have almost traced the leak to the source but... It comes down from the back of the head and above the bell housing. It runs down the right side of the bell housing and into the lip of the flywheel inspection cover and out the little hole. Initially I thought it was a freeze plug but they are lower than the leak. All I can identify above the bell housing is the head, which could have a crack. Any ideas from the group? I will say I flushed the block and replaced the radiator and had MUCH rust. I then used a rust melter in the block for 3 days and now no rust. Maybe I loosened up an old leak.


1959 Chevy Apache Stepside Truck
Re: Antifreeze Leak 235 6 cyl Chevy
59rebuild #1377409 Thu Sep 17 2020 12:45 PM
Joined: Feb 2004
Posts: 21,017
H
Boltergeist
Try re-torqueing the head. It can't hurt, and it just might help. Loosen the bolts about 1/2 turn one at a time, following the factory torque sequence, and retighten them. You're probably headed for a head gasket change, but it never hurts to make one last stab at a quick fix.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Antifreeze Leak 235 6 cyl Chevy
59rebuild #1377431 Thu Sep 17 2020 04:48 PM
Joined: Jun 2004
Posts: 8,221
W
Master Gabster
There are some core plugs (freeze plugs) behind the manifolds that can leak sometimes & run down the back of the engine. A pressure test may help locate it.
George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: Antifreeze Leak 235 6 cyl Chevy
59rebuild #1377450 Thu Sep 17 2020 08:33 PM
Joined: Mar 2010
Posts: 127
B
Curmudgeon
If it's not leaking at the head and/or head gasket, it could be the rear freeze plug.
It's covered by the bell housing.
Picture borrowed from Deve's website.

Attached Files
Rear Plug.jpg (58.93 KB, 118 downloads)
Re: Antifreeze Leak 235 6 cyl Chevy
59rebuild #1377458 Thu Sep 17 2020 10:39 PM
Joined: Aug 2018
Posts: 394
2
Shop Shark
Also something to consider
I have a small coolant leak in one of my 235s that’s right in the middle of a flat spot on the side of the block, not even at a seam or ridge in the casting
So a defective block is possible too
Just like 59rebuild my leak was only noticeable after I cleaned the rust out the block, before that it was dry (oily and dirty tho).
-s

Last edited by 2ManyTrucks; Thu Sep 17 2020 10:40 PM.
Re: Antifreeze Leak 235 6 cyl Chevy
59rebuild #1377474 Fri Sep 18 2020 01:37 AM
Joined: Sep 2001
Posts: 30,447
ace skiver
I sealed a small crack/leak with epoxy cement/glue in the same location on my Suburban’s 1960 261 block over 15 years ago (based a recommendation/suggestion posted here).

It has not leaked since then.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Antifreeze Leak 235 6 cyl Chevy
59rebuild #1377607 Sat Sep 19 2020 03:26 AM
Joined: Mar 2010
Posts: 9,443
5
Master Gabster
What is the condition of this engine in terms of how long before it may need an overhaul?
If its high miles (over 60-70k miles for these engines most of the time), add some stop leak in it to buy you some time until a rebuild is in order. I did that on well worn, but great running 216 which had a 5 inch crack in the water jacket by the petcock drain. It still had a bit of a weep, but did not leave a puddle. I drove it for 20,000 miles after that with no issues.

Re: Antifreeze Leak 235 6 cyl Chevy
52Carl #1377641 Sat Sep 19 2020 04:23 PM
Joined: Jul 2016
Posts: 19
5
New Guy
I really do not know though it runs very well, no strange noises, good power. I bought it and restored with partial cab/engine on frame. The only thing I notice is moisture out the exhaust when it first starts up which I figured was due to being cold and moisture had settled in the ehaust.


1959 Chevy Apache Stepside Truck
Re: Antifreeze Leak 235 6 cyl Chevy
buoymaker #1377642 Sat Sep 19 2020 04:26 PM
Joined: Jul 2016
Posts: 19
5
New Guy
Originally Posted by buoymaker
If it's not leaking at the head and/or head gasket, it could be the rear freeze plug.
It's covered by the bell housing.
Picture borrowed from Deve's website.

My leak is above the bell housing and dripping down the side, into the flywheel inspection cover.


1959 Chevy Apache Stepside Truck
Re: Antifreeze Leak 235 6 cyl Chevy
Hotrod Lincoln #1377643 Sat Sep 19 2020 04:27 PM
Joined: Jul 2016
Posts: 19
5
New Guy
Originally Posted by Hotrod Lincoln
Try re-torqueing the head. It can't hurt, and it just might help. Loosen the bolts about 1/2 turn one at a time, following the factory torque sequence, and retighten them. You're probably headed for a head gasket change, but it never hurts to make one last stab at a quick fix.
Jerry

I will give that a twist, no pun intended.


1959 Chevy Apache Stepside Truck
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