Automatic Transmission Main Control Inspection (22-7036)

AUTOMATIC TRANSMISSION MAIN CONTROL INSPECTION

Inspection criteria:

• Completely disassemble, clean and dry all parts prior to inspection following the WSM procedure. Metal debris in the valve body should be cleaned and is not automatic grounds for valve body replacement.
• Check balls should have no flat spots (roll check on flat surface).
• Separator plates should have only slight witness marks from check balls.
• Anodized valves only: Inspect the valves for scratches and worn through coating on the face of the valve lands (surface that touches the bore).
• A scratch is any measurable depth or raised area which runs across the entire length of the valve land.
• For anodized valves, a scratch or worn valve land requires part replacement.
• Both anodized and nickel valves should be gravity checked. Place the clean, dry valve into the clean, dry bore and verify the valve moves freely under its own weight as the casting is turned over. Refer to the video at end of this article for demonstration.
• If any clean, dry valve does not move freely the casting assembly must be replaced.
• Check for broken or damaged springs. Springs are not serviced separately from valve/solenoid/pump body.
• If the valve passes the gravity check, the final check is to re-assemble and check valve for free linear motion with a non-marring instrument. Refer to the second video at end of this article. Additionally, use the non-marring instrument to check the valve for excessive radial movement in the bore of the casting. If the valve rocks in the bore of the casting, the casting is worn and should be replaced.

PART DESCRIPTION - CBR1/C456 REGULATOR VALVE (FIGURE 8)

Area circled does not contact bore. Scratching or blemish in the valley area does not affect the operation.

Tech comment: tech reported metal in fluid and shuttles scored so the main control was replaced.

Engineering analysis/comments: photos of the returned part indicate minor surface blemishes that should not be considered as "scuffing" or "scoring". Marks found in the valley area are often normal and occur during manufacturing. Based on the visual inspection this part should have been cleaned and re-used. Part passed all engineering performance tests.

PART DESCRIPTION - CBR1/C456 REGULATOR VALVE (FIGURE 9)

Engineering analysis/comments: area circled shows a cosmetic concern which does not catch on a fingernail. This returned part passed engineering performance testing. Photos indicate minor surface blemishes in the valley area that should not be considered as "scuffing" or "scoring". This part should have been re-used.

PART DESCRIPTION - C35R REGULATOR VALVE (FIGURE 10)

Engineering analysis/comments: this part passed all engineering performance tests. Photos indicate minor surface blemishes in the valley area. As in similar previous examples, these marks were likely created during manufacture. Blemishes in this area do not impact valve sealing and would not create a sticking condition. This valve would not require a valve body or solenoid body replacement.

PART DESCRIPTION-CONTROL PRESSURE REGULATOR VALVE (FIGURE 11)

Engineering analysis/comments: this part passed engineering performance tests. The photo indicates cosmetic issues only. Area in left circle is very light, not measurable or felt with a fingernail, and doesn't extend across entire length of surface so it would not result in a leak. Valley area in right circle is not a sealing surface. This valve should not have been replaced.

VALVE BODY CASTING INSPECTION

If the valve passes the gravity checks outlined in the inspection criteria, the final check is to re-assemble and check the valves for free linear motion with a non-marring instrument. Refer to the second video at the end of this article. If the valve cannot be moved freely side to side, the valve body casting is not reusable and requires replacement. Additionally, use the non-marring instrument to check the valve for excessive radial movement in the bore of the casting. If the valve rocks in the bore of the casting, the casting is worn and requires replacement. (Figure 12)

The video below shows proper valve inspection and movement check, along with gravity test which shows a clean dry valve moving under its own weight.

Valve inspection and movement check 

VALVE INSPECTION AND MOVEMENT CHECK

The video below has some of the same checks, but demonstrates the use an acceptable tool to check valves for sticking after cleaning and assembly.

Using a tool to check for sticking valves 

USING A TOOL TO CHECK FOR STICKING VALVES

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