67 289 transmission and radiator leaks - Ford Mustang Forum
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post #1 of 6 (permalink) Unread 4 Days Ago Thread Starter
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67 289 transmission and radiator leaks

My 67 coupe is in pretty good condition but I have a couple issues that are probably fairly simple fixes but cant seem to find them. One, I have a radiator leak that is dripping on the engine block which is creating a small pool. I'm thinking it might be a bad gasket and I just need to replace it or the main line needs to be tightened, but at the moment I cant seem to figure out where it is coming from. And two, I have a moderate transmission leak on the passenger side of the car which I also cant find. If anyone has any suggestions on what to check or what might be the issue I'd greatly appreciate it.

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Originally Posted by Seay67 View Post
My 67 coupe is in pretty good condition but I have a couple issues that are probably fairly simple fixes but cant seem to find them. One, I have a radiator leak that is dripping on the engine block which is creating a small pool. I'm thinking it might be a bad gasket and I just need to replace it or the main line needs to be tightened, but at the moment I cant seem to figure out where it is coming from. And two, I have a moderate transmission leak on the passenger side of the car which I also cant find. If anyone has any suggestions on what to check or what might be the issue I'd greatly appreciate it.
A radiator leaking cannot leak on the engine block.......in is in FRONT of the engine. So, if you mean a leak is present seen on the engine, it might be a heater hose, intake manifold gasket, cooled carb spacer, water pump or it's hoses, timing chain cover, expansion plug in the block.

Transmission leak on right side often results from leaking fitting securing the dipstick tube to the pan. Try tightening it.

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there is a tool made that will pressurize the cooling system, which should make the leak obvious. it fits onto the radiator where the cap normally goes. clean the tranny off with brake cleaner, let it dry, start it up, this will make the leak more apparent. a hoist helps so you can get under it and see things better
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Passenger leaks on the C4 are *usually* a problem with the dipstick seal, and while messy, it's thankfully a pretty easy fix.


When you say 'dripping on the block' if it's up by the intake, under the upper radiator hose, your thermostat housing gasket may be to blame, or possibly the upper hose itself. If your radiator hoses feel 'crunchy', rock hard, or soft and squishy when you squeeze them, it is time for new ones!

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The leak on the block is probably only the thermostat hosing gasket to the inlet manifold.
The trans leak could be the dipstick tube seal or a pipe fitting that just needs to be nipped up.
Best way is to clean or degrease the area, dust some talc powder on and inspect regularly to find the leak.
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15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.
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post #6 of 6 (permalink) Unread 23 Minutes Ago
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A cooling system pressure tester is very helpful for finding small leaks that are otherwise hard to find. They're not expensive; I got mine used on Ebay. It's one of those things that once you have it, you won't know how you did without it.
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