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#1458614 Wed Jul 13 2022 12:16 PM
Joined: Feb 2019
Posts: 94
87GN Offline OP
nothing beats a try but a failure
My new 235 has an oil leak. Oil is found on the block at the edge of the head, passenger side, about mid way from the front to the back. The valve cover is sealed and not leaking. Head was checked for cracks, had none. The head is rebuilt and decked, same as the block. Has any one had this oil leak and if so can it be fixed?

1955.1 3600 5 window 4 speed all original.
87GN #1458615 Wed Jul 13 2022 12:22 PM
Joined: Feb 2019
Posts: 2,967
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Can you post a picture of the leak?

Moderator, The Engine Shop & Interiors

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery Forum

‘59 235 w/hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
87GN #1458618 Wed Jul 13 2022 01:00 PM
Joined: Mar 2011
Posts: 260
Is it near the coil bracket? I had to reseal the bolts holding my coil on and it solved one of my leaks.

1955 First series 3600
87GN #1458620 Wed Jul 13 2022 01:24 PM
Joined: Jan 2014
Posts: 2,345
The coil mount bolts enter an oil passage?

87GN #1458621 Wed Jul 13 2022 02:04 PM
Joined: Apr 2005
Posts: 3,090
We use an indicator dye and a UV light for oil, coolant, or refrigerant. Shows EXACTLY where leak is.

JW51 #1458623 Wed Jul 13 2022 02:14 PM
Joined: Feb 2004
Posts: 25,334
Kettle Custodian (pot stirrer)
Originally Posted by JW51
The coil mount bolts enter an oil passage?

They go through a thin casting into the valve valley that holds the rocker arms. It's not pressurized, but splash oil can seep through the threads unless you put a little LocTite or some other sealer on the bolt threads.

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!"
Abraham Lincoln

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

87GN #1458638 Wed Jul 13 2022 04:38 PM
Joined: Jan 2014
Posts: 2,345
Hm. I’ve got some wet look back in that area that I assumed was a valve cover seep.

Learn something new every day.

87GN #1458652 Wed Jul 13 2022 06:16 PM
Joined: Dec 2017
Posts: 1,183
Makw sure the hex plug at the midde center top of the head, pass side, is tight and not leaking.

87GN #1458659 Wed Jul 13 2022 06:27 PM
Joined: Jan 2014
Posts: 2,345
My 235 is always “sweating horsepower” and it’s hard to figure where one seep ends and the next begins.

One of these days, I will start tracking down the source. But as it is today, it rarely swears enough to leave more than a drop on the floor.

87GN #1458662 Wed Jul 13 2022 07:01 PM
Joined: Mar 2014
Posts: 3,147
If it is leaking right in the center of the head on the passenger side (where the head meets the block), there is an oil passage there. It leads up through the head and on from there to the rocker arm shafts (to lubricate those). If the head gasket wasn't sealed (even if the block and head were decked) I've seen 235s leak right there. Usually this is a seeping leak. Especially if your 235 was rebuilt to factory specs. By that I mean the proper bearing to crank tolerances, new cam bearings, new oil pump, etc...that will cause you to have a nice amount of oil pressure and it can seep out at that passage.


1952 1/2 ton with 1959 235
T5 with 3.07 rear end
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