Borg Warner 65 oil leak

R

roveratle

New Member
Hi
My 1976 P6 3500 auto have an oll leak I cant cure.
Symptoms as follow:
When car is not used frequently the gear box leaks a lot of oil.
When topped up and used frequently ( lets say once a week) theres no oil leak.
I havent been able to source the leak.
It also have a habit of lifting the dip stick.
I have checked the breather pipe and theres no obstruction.
Any ideas? ( except using the car frequently , whitch is no option in here in the icy winter roads in Norway )
Best regards
AtleG
Oslo, Norway
 
Our '75 3500 does just the same. She's been laid up for a couple of years & the ATF stain on the concrete floor has been spreading gradually (should put a drip-tray down really). When in use it's not noticable. Mind you, perhaps they leak all the time but you only notice when the fluid collects in one place due to the car not moving. All Borg-Warners leak a bit it seems.
 
There is a check valve in the valve block to stop the converter draining back its fluid when the box isn't in use. If the check valve isn't working properly all the fluid from the converter runs back into the box and overfills it, so causing the leak.
 
IIRC the converter check valve is a spring loaded ball bearing, which if sticky or not seating correctly causes the converter fluid to drain back. It's a common problem and would involve the valve block to be removed and dismantled to check the condition of the valve, but it's not a particularly good set up in the first place so theres no real guarantees it will cure the problem.
 
IIRC the converter check valve is a spring loaded ball bearing, which if sticky or not seating correctly causes the converter fluid to drain back. It's a common problem and would involve the valve block to be removed and dismantled to check the condition of the valve, but it's not a particularly good set up in the first place so theres no real guarantees it will cure the problem.
????
Is this a diy job??
Atle
 
roveratle said:
IIRC the converter check valve is a spring loaded ball bearing, which if sticky or not seating correctly causes the converter fluid to drain back. It's a common problem and would involve the valve block to be removed and dismantled to check the condition of the valve, but it's not a particularly good set up in the first place so theres no real guarantees it will cure the problem.
????
Is this a diy job??
Atle
Click to expand...

As far as actually doing the job, no special tools are required, however you will end up dismantling the valve block, and TBH if you don't know what you're doing it's best left to someone who does. Regular use will get around the problem most times anyway, because it only happens when it is left standing.
FWIW if it's filled with Dexron fluid (which it shouldn't be) that could make the problem worse.
 
Harvey, what do you think of the latest article on the BW35 rebuild in Practical Classics ? I see a fellow P6 driver wrote in criticising their P6 rebuild and also the Westfield kit they put together is having a rebuild .
 
DaveHerns said:
Harvey, what do you think of the latest article on the BW35 rebuild in Practical Classics ? I see a fellow P6 driver wrote in criticising their P6 rebuild and also the Westfield kit they put together is having a rebuild .
Click to expand...

I have always been taught that if you have nothing good to say, don't say anything at all!!! :wink:

I particularly liked the 4 spanner rating which said that surgical standards of cleanliness in the working environment were essential. Take a look at some of the pics (the front pump in the vice is a good one) and see the piles of 5h1t that are everywhere, old rags, paint pots, all manner of old rubbish all over the place, and that's not the only one.

The one truth in there is that you cant fit the pistons to the drums without an installer, which I've always said. (I have access to this and would be more than happy to get them done)

I think if you knew nothing to start with, you wouldn't know much more by the time you'd read it all.
 
DaveHerns said:
Isn't it Annables doing the rebuild ?
Click to expand...

From what I read they supplied the boxes and the premises for them to be dismantled and photographed. I couldn't work out why the first article showed a P6B box being dismantled, and the last article a Taxi box was being reassembled. I'd be the first to admit that they're all basically the same, but they aren't exactly the same so why not show just the one box?
 
DaveHerns said:
How did you know it was a taxi box ?
Click to expand...

I knew from the pics that it wasn't a P6B box the same as was shown in the dismantling procedure, and by the time I read on and saw the later pics, it says in the text that it was a Taxi box, as shown by the two speedo cables, one for the speedo and one for the meter.
 
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