Mike44138

iTrader: (3)

Sticky possibly??

M/T - Improved Hydraulic Clutch Bleeding Procedure

File In Section: 07 - Transmission/Transaxle

Bulletin No.: 01-07-31-002A

Date: September, 2004

INFORMATION

Subject:
Improved Bleeding Procedure for Hydraulic Clutch Release System

Models:
2005 and Prior Passenger Cars and Light Duty Trucks
2005 and Prior Chevrolet and GMC 6-7F T-Series Medium Duty Tilt Cab Models
2005 and Prior Isuzu F-Series Medium Duty Tilt Cab Models

This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 01-07-31-002 (Section 07 - Transmission/Transaxle).

This bulletin is being issued to inform dealers of an improved procedure to aid in the ease of bleeding the clutch hydraulic system for the above listed vehicles. This procedure can be used anytime air is introduced into the hydraulic system. Following this procedure may also reduce the number of unnecessary parts replaced for low clutch pedal reserve and high shift effort.

1. Verify that all the lines and fittings are dry and secure.

2. Clean the dirt and grease from the reservoir cap in order to ensure that no foreign substances enter the system.

3. Remove the reservoir cap.

4. Fill the reservoir to the proper level with the required fluid.

5. Attach the J 43485 (Adapter) to the J 35555 (Mity Vac) or equivalent.

Important: Brake fluid will deteriorate the rubber on J 43485. Use a clean shop cloth to wipe away the fluid after each use.

6. Place and hold the adapter on the reservoir filler neck to ensure a tight fit. In some cases, the adapter will fit into the reservoir opening.

7. Apply a vacuum of 51-68 kPa (15-20 hg) and remove the adapter.

8. Refill the reservoir to the proper level.

9. Repeat Steps 6 and 7.

10. If needed, refill the reservoir and continue to pull a vacuum until no more bubbles can be seen in the reservoir or until the fluid level no longer drops.

Caution: The vehicle will move if started in gear before the Actuator Cylinder is refilled and operational Start the vehicle the first time in neutral to help prevent personal injury from vehicle movement and see it the transmission will shift easily into gear.

11. Pump clutch pedal until firm (to refill actuator cylinder).

12. Add additional fluid if needed.

13. Test drive vehicle to ensure proper operation.

GTA91

iTrader: (14)

"J 43485 (Adapter)"

Where do you get that at??

SIC LSX

iTrader: (10)

pics pics pics

jerflash

ya whats the adaptor

BJM

iTrader: (1)

This sounds like a way to mimic the factory fluid install. Pull a relatively hard vacuum on the system, release the oil and it pulls its way all the way in to the end of the hydraulic circuit, no "bleeding" to be done.

Ferocity02

iTrader: (60)

That is just the Mity Vac bleeding method... which isn't a very good way to bleed the system. Bench bleed is the only way to do it right.

BJM

iTrader: (1)

I just saw this in a thread las week, its how the factory fills hydraulic systems. they don't bench bleed anything. Maybe its hard to duplicate after the fact.

SPEEDYws6

iTrader: (9)

That method seems to be hit or miss. It depends on how much air is in the system. You pretty much have to bench bleed the master, the air always gets trapped in the master, I hardly ever have to bleed a slave.

blkbird_WS-6

iTrader: (14)

Yeah that!

mondi2002

iTrader: (11)

Sounds like its just one of the tips that comes with the mityvac kit.

8a8mfh

iTrader: (3)

In other words whatever else you can make fit.

jannes_z-28

Adapter J 43485 is just asimple rubber plug with a hole in the center for the Mityvac.

Should be found in any hardware store.



Jan

Hugger Z

iTrader: (4)

This method sounds like it mimics the Evac & Fill method at the manuracturing plants. They apply a vacuum to the system and then release the fluid and it gets sucked into the system. That is how they fill many of the fluids on your cars (brake, clutch, coolant). At least it confirms for us that the mity vac method should be fine. That tells me the seals should not have issue with going inverted as others have been concerned about.

1998z28ss

People saying the mityvac wont work due to there being too much air are simply wrong. My tranny fell off the jackstands we had it on and ripped my hose off my slave and completely drained my master. We bled it futily for 20 minutes the "factory" way and NOTHING. 15 minutes with the mityvac and it shifted like butter, it was incredible theres no way i'd bleed it any different.

MrEddie

The J 43485 appears to be the reservoir cap with a connection drilled in the top to accept a fitting, i.e. mityvac. Instead of pulling a vacuum from the bottom of the reservoir hole, it's pulling from the top.

I didn't know the factory fill was done by creating a vaccum and sucking the fluids into the void - interesting. I guess that's why the dealers always perform a safety fluid check (especially brakes) before delivering to the customer.