Just bought a 65 Monza with leaking transmission!

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screwrod@gmail.com
Posts: 26
Joined: Thu Nov 05, 2020 10:59 am

Just bought a 65 Monza with leaking transmission!

Post by screwrod@gmail.com »

Hey everybody, so I got a pretty good deal on this 65 Monza, just picked it up for a hobby to hopefully get in drivable condition, new to this forum, looks like there is a lot of knowledgeable people in here,Cuz I'm only need some help!

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flat6_musik
Posts: 2433
Joined: Sun Apr 04, 2010 10:03 am
Location: Hesperia, CA

Re: Just bought a 65 Monza with leaking transmission!

Post by flat6_musik »

We usually just say "I bought a corvair". 😁 Welcome!

Better climb under there, wipe down the pan and see what you see. A pan gasket is probably step 1....

Wagon Master
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Joined: Thu Jul 28, 2011 6:36 pm

Re: Just bought a 65 Monza with leaking transmission!

Post by Wagon Master »

That is some excellent troubleshooting. I can't figger out how you determined it's an automatic.

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flat6_musik
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Joined: Sun Apr 04, 2010 10:03 am
Location: Hesperia, CA

Re: Just bought a 65 Monza with leaking transmission!

Post by flat6_musik »

Sticks don't leak enough to be annoying. 😁

joelsplace
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Joined: Wed Oct 13, 2010 12:51 pm
Location: Northlake, TX

Re: Just bought a 65 Monza with leaking transmission!

Post by joelsplace »

If you have the pan off you need to replace the shift cable o-ring and TV o-ring. The pan has to be off to replace the TV o-ring and it is easier to do the shift cable o-ring with the pan off but not required.
113 Corvairs, 5 Ultravans and counting
Northlake, TX

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bbodie52
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Re: Just bought a 65 Monza with leaking transmission!

Post by bbodie52 »

:welcome2: :wave: Welcome to the Corvair Forum!

With the Corvair Powerglide automatic transmission, you have what is normally a reliable, solidly built transmission. It has a weakness in that any chronic transmission fluid leak places its operating health in jeopardy. They don't tolerate overfilling or low fluid levels very well. You should examine the existing fluid on the dipstick. The fluid DEXRON fluid should be red in color. If it is discolored or brown in color, or has a burnt odor, this is a sign that it has been running with low fluid and low oil pressure, which can cause slippage and burning of the internal bands and clutches. For this reason it is important to correct fluid leaks quickly so that more-serious damage does due to low fluid levels does not occur.

Overall the Corvair Powerglide has established a good reputation for reliability. Its weak links are brought out by improper fluid levels, with leaks bringing on chronically low fluid levels resulting in internal clutch and band slippage and internal damage. High fluid levels can result in foaming and air entrainment caused by the planetary gear assembly spinning in a bath of transmission fluid.

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Not all Powerglide dipsticks are the same length. When the Corvair body style changed in 1965, the dipstick tube and matching dipstick had to be lengthened to match the new body shape and dimensions. Over the years it might be possible that the incorrect dipstick made its way into the wrong model year. Here are guidelines to verify that you have the correct dipstick in your Corvair...

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The vacuum modulator will usually wear out and fail over time, but is relatively easy to replace. A failed modulator is often indicated by the presence of transmission fluid in the vacuum hose.
Modulator (Modulator Valve) C876 8 oz. http://www.corvair.com/user-cgi/catalog ... w_page=135
Clark's Corvair Parts,Inc. has EXACT ORIGINAL REPRO modulator valves. Don't Settle for "Should Work" Replacements. If your modulator is more than 10 years old, you are really on borrowed time. The inner reinforced rubber diaphragm is VERY THIN (.017 - .019) and is weakened by hot PG fluid and constant flexing.
Image Powerglide Vacuum Modulator Leak

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VIN - LM Corvair Passenger Car VIN Tag Decoding.jpg

The link below will provide you with a list of useful websites that are Corvair-related. Some of the links will lead you to an extensive technical library that will allow you to download shop manuals and other technical references in Adobe Reader format at no cost. There is also a link that will help you to locate nearby CORSA (Corvair Society of America) club chapters. You will also find a list of essential Corvair parts suppliers. Clark's Corvair Parts in Shelburne Falls, MA is the biggest and oldest Corvair supplier in the world. You will find a link that can provide you with a series of videos that amount to a tour of the Clark's Corvair Parts facilities. Parts suppliers such as this truly make our Corvair hobby possible.

Common and Useful Corvair Websites

Corvair Forum :link: http://www.corvairforum.com/forum/viewt ... 225&t=6007

:dontknow: I would like to encourage you to expand on your initial post and tell us more about yourself, your Corvair interests, and your goals for your Corvair Monza. Helping us to know more about you will help us to write comments to you that are tailored to your needs and experience. Detailed pictures of your Corvair — including the engine compartment — would possibly be useful. If one is near you, local CORSA club chapter members can most-likely advise you concerning local Corvair-qualified mechanics. If you are considering doing any maintenance on your Corvair yourself (highly recommended) the CORSA club members and Corvair Forum members would be happy to assist you.

:welcome: :welcome2:

:chevy: :wrench:
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Brad Bodie
Lake Chatuge, North Carolina
Image 1966 Corvair Corsa Convertible

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