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transmission leak 200

Car: 86 Volvo 240 wagon, automatic, RWD.
Problem: Leaking transmission?

I recently had my car towed due to a rusted out spring seat. The tow truck was not a flat bed. I tried to get a flat bed but couldn’t, it’s a long story. Anyway, the guy showed up and began hooking up the front of the car. I told him the car is in park, he nods. He then begins pulling it in close with his hydraulics and the rear wheels on my car begin to squeal. I yell, and he stops. I put it in neutral and from that point on we hear a squeak sound from the rear end. He tells me to start the car, I ask why. “It keeps the transmission warm”. Seems to be a good idea so I do. We begin towing, squeak persists. It’s loud, we can hear it from the cab of the truck. When we get up to about 15mph it stops. We tow it for about 20 miles to my home. I pay him and he leaves. That weekend I fix the spring seat. On my first ride out the transmission makes a loud clunk sound every time I put it in drive. The wife suggests I check the fluid. When I check it, it’s really low. Really. I bring it up to a normal level, the clunk is now gone. Several days later I’m noticing a small puddle under the transmission. I check the fluid again and it’s lower but at an acceptable level. My theory is that I have a slow leak. I’m a newbie to this mechanic stuff and I’ve never dealt with a leaking transmission before. Below are my many questions.

Can towing a car this way damage the transmission in this way?
Is it possible for fluid to leak out this much if the car is up at an angle?
Maybe the squeak isn’t related to the transmission but something else on the rear axle?
Does leaving the car running really help?
What’s the best way to find a leak, if it is a leak?

Thanks in advance.
-SteveC








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    transmission leak 200

    > Can towing a car this way damage the transmission in this way?
    Yes, it can trash the transmission depending on the distance of towing.
    I am not sure about Volvo, but BMW manual states that you should to over fill the transmission before towing this way.


    >Is it possible for fluid to leak out this much if the car is up at an angle?
    Yes, there are number of seals located at top rear of AW70. Any of these seals can leak.


    >Maybe the squeak isn’t related to the transmission but something else on the >rear axle?
    It can be differential/CV joint making the noise.


    >Does leaving the car running really help?
    It helps rotating the transmission fluid.

    >What’s the best way to find a leak, if it is a leak?
    Get Bentley Manual, AW70 transmission section, you will find all locations of transmission seals. Walk though and clean them out.
    When after week or so, inspect for leaks.








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      transmission leak 200

      Thanks! I've been meaning to clean everything down there anyway.
      -sc








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    transmission leak 200

    Two very common leaks on these cars are a worn rear seal and a pinhole in one (or both) of the cooling lines.

    I had both of these problems on my '83 GL, and also had the seal problem on my '86 GL. Both occured somewhere around 200k miles, more or less.

    The seal problem is caused by a worn tailshaft bushing. For me, replacing the bushing and seal solved the leak both times and also solved an annoying high-frequency vibration or "drumming" or "humming" sound (due to the driveshaft spinning ecentrically).

    Pinholes in the cooling lines occur where they go under the clamps on the support brackets. Vibration eventially chafes through the steel pipes. You can cut out the 2"-3" of worn pipe and splice in using high quality Neoprene fuel hose and several high quality clamps. I got almost 100k miles out of that repair on my '83 (before it died of rust).

    You can also prevent this from occuring by putting a cushion around the pipes under the clamps so the pipe can't vibrate (I used several wraps of friction tape). If you splice in hose, secure the pipes using heavy zip-ties.

    A less common leak comes from displaced or bad seals on the sides of the tranny where the transverse shift shaft goes through. It's easy to replace the driver's side seal, but more difficult on the passenger's side because you must first drop the exhaust pipe for working room.

    I had an '81 that leaked at a side seal, and I found that the seal had simply popped outward. Reseating the seal solved the leak.

    I doubt that any of these are related to towing your car.
    --
    Don Foster (near Cape Cod, MA)








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      transmission leak 200

      Hope I don't need to drop the exhaust pipe. But if I do, does this require actually disconnectingthe pipe?








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        transmission leak 200

        You must disconnect the pipe at the manifold and at the catalytic converter. Both are flanged fittings, and both have gaskets.

        You might find that the bolts at the cat are rusted solid, so you'll end up cutting them off. If they were originally threaded into the cat, then you simply drill through the remains and use bolts (with nuts) when you reassemble.

        It's a bit of work, but it doesn't require either special tools or rocket science. Just grunting and blisters. Special words help.

        Be prepared with new gaskets. Original metal-clad Volvo gaskets are the best.
        --
        Don Foster (near Cape Cod, MA)







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