Hot trans, cold pipes?

Demon James · Post by **Demon James** » Sat Mar 12, 16 1:19 pm

I was adjusting the shifter cable this morning after a gentle (20 mins) run since my engine build and noticed that the two pipes to a from the rad where cold to touch, as in cold not cool or warm.

The sump pan was very hot which made me question why the pipes were so cold, even at the point they enter the transmission case.

Any ideas chaps, cheers.

Oh, torqueflite 727

Dave81 · Post by **Dave81** » Sun Mar 13, 16 8:46 am

Blockage in the trans cooler system?

Think the system is high pressure though so not sure how you'd be able to trace the key point with it in place without jetting the walls.

Rebel · Post by **Rebel** » Mon Mar 14, 16 12:42 am

To test it, get two buckets, fill one with trans fluid and leave one empty. Undo the pipe work from the cooler / radiator, put the feed pipe in the full bucket and the return pipe in the empty bucket ( probably need some rubber hose to temporarily extend the pipes to reach the buckets ).
Rear of car on axle stands and fire it up, if all is ok you should have fluid pumping into the empty bucket and fluid draining from the full one

Hope this helps

Demon James · Post by **Demon James** » Mon Mar 14, 16 8:56 am

I had a short run out to a local meet on Sunday morning with Matt H and it was still the same when I parked up.

However, when I drove back and checked at home, the trans was not as hot and both pipes were very warm for their entire length.

I am going to fit a separate trans fluid cooler (currently on the stock rad lower section) and at the same time I will use the flow test method, Rebel

I also noticed that the kick down lever was, or rather the split pin holding the rod in place, was fouling the gear selector lever on the trans body.

This was preventing the lever going back all the way and also reducing throttle travel so I hope I haven't damaged anything

I have set the kickdown correctly as I've done this successfully before when I changed the inlet manifold so I'm confident this is close and I have now fixed the lever interference issue.

Since installing the new torque convertor (2400 stall), up shifts seem a lot later so I think some fine tuning is now in order when I next get time.

Having just put the engine back together I am reluctant to floor it until I get some miles in

John · Post by **John** » Mon Mar 14, 16 5:31 pm

If you have a installed a higher stall converter your trans will run hotter James.

MilesnMiles · Post by **MilesnMiles** » Mon Mar 14, 16 6:14 pm

James, that's the same JW convertor I have, right?
Give it some welly and let me know how it launches

Demon James · Post by **Demon James** » Mon Mar 14, 16 9:54 pm

John wrote:If you have a installed a higher stall converter your trans will run hotter James.

More slippage giving fluid a harder time creating friction I guess?

My first concern was how cold the trans cooling pipes where after the first two trips. Seems fine now, could it be air in the pipes and cooler? It was completely empty for a while

Definitely going to fit a seperate cooler though

Demon James · Post by **Demon James** » Mon Mar 14, 16 9:57 pm

MilesnMiles wrote:James, that's the same JW convertor I have, right?
Give it some welly and let me know how it launches

Might have to wait a while

certainly pulls a lot smoother than before, no bogging down from a standing start with mild throttle