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If the dash light stays ON until the OD drops out the relay is the problem.
If the dash light goes out then a few seconds later the OD drops out, you have one of three problems. The first having been about 95% of the cause in other similar complaints.
1st. Fluid getting past the seals on the solenoid piston and causing it to stay "ON". Repair is remove solenoid, remove the spring clip on the brass barrel, and with patience get the piston out. The parts in there are the clip, cap, small spring, piston with two O-rings on it. The last is the hardest to get out.
Cleaning is difficult since inside the body of the solenoid is an iron slug which can act like a sink stopper and not allow the cleaning solution and gunk out. Takes a small diameter item to keep it pushed up as you spray electrical contact cleaner up into the solenoid.
Unless you replace the O-rings on the piston, this condition will repeat itself.
2nd. Between the solenoid and the dashpot inside the OD is a small metered port. All actuating fluid must pass through this port to engage or disengae the OD. If blocked or partially blocked, the OD stays on or is slow to dis-engage. Use air only blown from the solenoid side to the dashpot side to clear.
3rd. The relief vlave and or dashpot is sticking and not allowing a smooth pressure release. When you clean the metered port you will notice this as the dashpot has to be removed to clean the port. Keep the springs and dashpot in the same relationship as you remove them.
In any case a fluid change will not correct the problem.
Flame suit on:
And I do not recommend any synthetic that IS NOT a DIRECT replacement for Type F ATF or 30W motor oil.
Reason. For the Sprague clutch to drive in gears one through four and the cone clutch to cause OD, any fluid that is between: the rollers in the Sprague clutch and the drive race; and the friction material of the cone clutch and the brake ring; MUST be squeezed out until essentially none is left. Since all synthetics have excellent cling and lube with super thin film layers, under certain conditions there will be slippage between the contact surfaces.
This slippage will increase: as the temp decreases and the load increases;
either individually or in combination.
In non OD situations this increases wear on the Sprague rollers and heat from the slippage. Neither is wanted. In OD the slippage between the friction material again causes wear and heat. Unwanted.
I got to this conclusion after some board members complained of slippage and after "other" cures did not work a change back to oil based Type F cured the problem.
A lot of research went into synthetics and why they work well compared to the symptoms and how the Sprague system and OD works before this conclusion was reached.
Again, any synthetic that IS NOT A direct replacement for Type F ATF or 30W motor oil I do not recommend.
Duane
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