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Is it unreasonable to think my 235 should not leak oil
#1411098 Sun May 23 2021 10:56 PM
Joined: Aug 2019
Posts: 35
K
'Bolter
I have done a bunch of work on the engine / transmission, or, I have had work done on engine and transmission. It's no longer leaving puddles of oil from engine, transmission and Diff, but i am finding a small film of oil on the oil pan after a 30-40 minute drive. Still no drips on the garage floor, but a small film of oil.
I had been a land rover owner for over 25 years, before buying my 1954 Chevy 3100. And after years of spending money fixing oil leaks, and finally being told, "Kevin, it's ok, they are going to leak a little bit. Not worth trying to solve it"
Should I say good enough on the oil leak of my 235 engine, or should I pull bits apart and try to fix every small dribble?

Thanks, K


1954 Chevy 3100
Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411100 Sun May 23 2021 11:37 PM
Joined: May 2001
Posts: 1,668
W
'Bolter
Others will give better solutions but there are ways to keep oil or gear lube, in this case, off the driveway.

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Last edited by Wally / Montana; Sun May 23 2021 11:57 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411101 Mon May 24 2021 12:09 AM
Joined: May 2021
Posts: 1
H
Moderated
Is it coming from the road draft tube/crankcase vent?

Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411103 Mon May 24 2021 12:21 AM
Joined: Dec 2017
Posts: 972
D
'Bolter
They all leak a little. So it sounds like you got it cleaned up pretty well!


Mike
Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411105 Mon May 24 2021 12:23 AM
Joined: Mar 2014
Posts: 2,476
J
'Bolter
You can make the 235 oil tight up to a point. That "point" is the rear main seal. I only know of one way to make the rear main oil tight and that is to polish the seal surface well and have the rear part of the block machined to accept a one-piece lip seal.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411123 Mon May 24 2021 01:43 AM
Joined: Feb 2001
Posts: 1,375
T
'Bolter
If it is a small film of oil, I would think that may be from the road draft tube.


Tommy
59 apache 1/2t
261 short stepside
Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411127 Mon May 24 2021 01:48 AM
Joined: Jan 2013
Posts: 1,987
'Bolter
If you get the leaking to stop, make sure you add oil because you are out!

Chris

Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411143 Mon May 24 2021 06:09 AM
Joined: Apr 2005
Posts: 2,837
C
'Bolter
On road draft tube equipped engines that just have a film of oil like yours a pcv valve will usually keep everything clean. They were offered from the factory for big truck applications but are easy to make. There are numerous "how to" articles on this so read up before starting. Done wrong you will have a mosquito fogger.


Evan
Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411155 Mon May 24 2021 11:55 AM
Joined: Aug 2005
Posts: 9,347
Ex Hall Monitor
Show me an old Chevy six that doesn't leak some oil and I'll show you an old Chevy six that is out of oil. Minimizing leaks is good and achievable. Trying to stop all leaks is folly. As noted above the film of oil on the pan is likely coming from the road draft tube. Engines of that era were not designed to be leak free because the environmental concerns were not present. An old Chevy six that doesn't mark her parking spot is almost unicorn rare.


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Re: Is it unreasonable to think my 235 should not leak oil
Kevin13Shaw #1411195 Mon May 24 2021 06:31 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
I don't know how it goes for that specific engine, but I can say that, in my experience, those blue rubber gaskets are like the Messiah for fixing oil and tranny fluid leaks. I had a 327 on my Chevelle that I was sure liked to drip at the timing cover just to make my BP go up, and it had the old school gaskets on it.

The 350 in my Panel Truck has the blue rubber gasket, and the only leak I noticed was right after I reassembled it and fired it up for the first time. I cranked down that one pan bolt, and no more leak. May be worth seeing if they make those gaskets for the 235.

Of course, by posting this response, I've probably now jinxed myself with new leaks.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
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