Hello all --
My overdrive has been slow to engage (and sometimes slips) when hot. I thought I had licked the problem with heavyweight oil and an operating valve adjustment a few years ago (which did help enormously), but it seems unhappy again on hot days at slow speeds....
Measured cold (with 50 weight oil), I got ~275 psi @ 1500 RPM in 4th. I then a) replaced the spring on the non-return valve, b) replaced the accumulator spring, and c) added a 1/16" washer in the accumulator piston.
Now (cold, still with 50 weight oil) I get ~510 psi @ 1500 RPM (and ~540 psi @ 3000 RPM) -- guess I didn't need the washer! -- BUT, the pressure now drops rapidly to zero as soon as I stop the transmission spinning.
I assume either the operating valve isn't seating or I messed up the accumulator piston rings? Fiddling with the former didn't seem to help, and how bad can the accumulator rings be if I'm seeing >500 PSI?
So I guess my question is, should I care? Everthing seems happy (at least on jackstands), except for the pressure dropping quickly. Or any troubleshooting ideas?
Thank you ever so much!
My overdrive has been slow to engage (and sometimes slips) when hot. I thought I had licked the problem with heavyweight oil and an operating valve adjustment a few years ago (which did help enormously), but it seems unhappy again on hot days at slow speeds....
Measured cold (with 50 weight oil), I got ~275 psi @ 1500 RPM in 4th. I then a) replaced the spring on the non-return valve, b) replaced the accumulator spring, and c) added a 1/16" washer in the accumulator piston.
Now (cold, still with 50 weight oil) I get ~510 psi @ 1500 RPM (and ~540 psi @ 3000 RPM) -- guess I didn't need the washer! -- BUT, the pressure now drops rapidly to zero as soon as I stop the transmission spinning.
I assume either the operating valve isn't seating or I messed up the accumulator piston rings? Fiddling with the former didn't seem to help, and how bad can the accumulator rings be if I'm seeing >500 PSI?
So I guess my question is, should I care? Everthing seems happy (at least on jackstands), except for the pressure dropping quickly. Or any troubleshooting ideas?
Thank you ever so much!