What clearance between valves and valve body bores requires valve body replacement?

If inspection reveals excessive clearances of 0.03 mm (0.0012 in) or more between the valves and the valve body bores, replace the entire valve body rather than attempt rework.

What cloth should be used to clean sticking transmission valves?

Always use crocus cloth, a very fine type of cutting material. Never use emery cloth, as it is too coarse and can scratch the valves or valve bores.

How long can the valve body be submerged in carburetor cleaner?

Do not leave valve bodies submerged in carburetor cleaner longer than five minutes. Rinse parts thoroughly and dry.

Why should the separator plate be checked for scratches?

Scratches or score marks can cause oil to by-pass correct oil passages and result in system malfunction. Replace the separator plate if necessary.

What is the first step in reassembling the control valve body?

Reinstall the six steel balls in the upper valve body, as shown in the assembly illustration.

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Nissan Automatic Transmission Control Valve Body Inspection & Assembly - AT-27

Control valve body cleaning and assembly notes with valve body photos and separator plate inspection figures

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Service manual page AT-27 with control valve body cleaning, inspection and assembly notes and photographs.

AI caption October 2005 · Photo 209 of 412

This is page AT-27 from a Nissan automatic transmission service manual section titled "Repair for Component Parts," continuing coverage of the Control Valve Body. The page explains inspection and cleaning procedures: replace the entire valve body if clearance between valves and bores exceeds 0.03 mm (0.0012 in); clean sticking valves with crocus cloth (never emery cloth, which is too coarse); avoid removing sharp valve edges; clean valves with alcohol or lacquer thinner and dip-clean valve bodies in carburetor cleaner for no more than five minutes; and lubricate all parts in clean A.T.F. before reassembly. Numbered inspection steps cover checking valves for burning, checking the oil strainer (illustration SAT306), checking the separator plate for scratches that could allow oil bypass (illustration SAT307), inspecting oil passages and threaded holes in upper and lower valve bodies, and testing valve springs against the Valve Body Spring Chart. The Assembly section begins with reinstalling the six steel balls in the upper valve body, shown in an illustration with arrows marking ball locations. Readers learn valve body inspection criteria, safe cleaning materials and methods, and the first step of valve body reassembly.

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Frequently asked questions

What clearance between valves and valve body bores requires valve body replacement?: If inspection reveals excessive clearances of 0.03 mm (0.0012 in) or more between the valves and the valve body bores, replace the entire valve body rather than attempt rework.
What cloth should be used to clean sticking transmission valves?: Always use crocus cloth, a very fine type of cutting material. Never use emery cloth, as it is too coarse and can scratch the valves or valve bores.
How long can the valve body be submerged in carburetor cleaner?: Do not leave valve bodies submerged in carburetor cleaner longer than five minutes. Rinse parts thoroughly and dry.
Why should the separator plate be checked for scratches?: Scratches or score marks can cause oil to by-pass correct oil passages and result in system malfunction. Replace the separator plate if necessary.
What is the first step in reassembling the control valve body?: Reinstall the six steel balls in the upper valve body, as shown in the assembly illustration.