Mazda RX7. Manual - part 23

1.1L ROTARY

Article Text (p. 6)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

control valve spring free length. Free length must be 2.74" (69.6 mm).

NOTE: Cap bolt and valve spring for 1983 models are painted
yellow. Never use a control valve spring from a 1982 or
earlier year in 1983 models.

4) Check for stepped wear on rotor sliding surfaces of the 3
housings . Measurements are made using a dial indicator and gauge
body. See Fig. 6.

Fig. 6: Measuring Housing Wear with Dial Indicator
Check entire circumference of housing.

5) Side seal step wear must be checked on the inside and
outside of oil seal tracing mark. See Fig. 7.

Fig. 7: Checking Side Seal Step Wear
Replace housing if step wear exceeds limit.

SIDE SEAL STEP WEAR TABLE

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Location Limit

1.1L ROTARY

Article Text (p. 7)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

Inside Oil Seal Tracing Mark ............. .0004" (.01 mm)
Outside Oil Seal Tracing Mark ............. .004" (.10 mm)

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6) Check oil seal step wear. Limit is .0008" (.02 mm). See
Fig. 8.

Fig. 8: Oil Seal Step Wear
Step wear limit is .0008" (.02 mm)

7) Measure inner diameter of main bearing and outer diameter
of bearing journal on eccentric shaft. Standard clearance is .0016-.
0028" (.04-.07 mm). If clearance exceeds .0039" (.10 mm), replace
bearing.
8) To replace front or rear main bearing, remove stationary
gear retaining bolts. Using a mandrel (49 0813 235), drive stationary
gear with bearing out of housing .
9) Place stationary gear in a press. Use same mandrel and
press main bearing out of stationary gear.
10) Install new bearings while aligning tang bearing with a
slot of stationary gear. Press bearing into gear until adapter of
mandrel just contacts stationary gear flange. Install the stationary
gear into the housing, aligning the slot of the gear flange with the
dowel pin on the housing. See Fig. 9.

NOTE: When installing rear main bearing, check condition of "O"
ring and replace if necessary. Apply sealing agent on
stationary gear flange prior to installing it on rear
housing. Align pin and slot.

1.1L ROTARY

Article Text (p. 8)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

Fig. 9: Stationary Gear Slot & Dowel Alignment
Illustration applies to front and rear housings.

Rotor Housing
1) Inspect rotor housing for signs of water or gas leakage.
Check for wear or damage to rotor running surface or stationary gear.
Check main bearings for signs of scoring or flaking.
2) To clean housing, wipe off sealing agent or carbon in
rotor running surface with a rag and ketone or thinner. Remove rust
deposits in water cooling passages.
3) Inspect for cracks or damage to chromium-plated surface.
Check for signs of gas or water leakage. Housing must be replaced if
any of these conditions exist.
4) Place a straightedge across sealing surface of rotor
housing and check for distortion with a feeler gauge. If distortion
exceeds .0016" (.04 mm), replace housing. See Fig. 10.

Fig. 10: Measuring Rotor Housing for Distortion
Replace if distortion exceeds limit.

5) Check rotor housing thickness at points A, B, C, and D in
Fig. 11. If micrometer readings vary between point A and minimum value
for B, C, and D by more than .0024" (.06 mm), replace rotor housing.

1.1L ROTARY

Article Text (p. 9)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

NOTE: This excessive clearance would indicate a possibility of gas
or water leakage.

Fig. 11: Rotor Housing Thickness Check Points
Check thickness at A, B, C & D.

Rotors
1) Inspect rotor for wear or damage, and check internal gear
for chips, cracks or scoring. Measure rotor width at 3 points, and
subtract maximum width from width of rotor housing at point "A" in
Fig. 11.
2) Clearance between side housing and rotor should be .0047-.
0071" (.12-.18 mm). If clearance is excessive or rotor is damaged,
replace rotor assembly.
3) If clearance is less than specified, internal gear may
have come out. Strike internal gear lightly with plastic hammer and
remeasure.
4) Measure inner diameter of rotor bearing and outside
diameter of rotor bearing journal on eccentric shaft. Replace rotor
bearing if clearance exceeds .0039" (.10 mm) or any damage is shown.
See Rotor Bearing Replacement.

Rotor Oil Seal
With oil seal installed in rotor, measure contact lip width
of seal. Seal must be replaced if contact width exceeds .020" (0.5
mm). Measure seal protrusion, and replace seal spring if protrusion is
less than .020" (0.5 mm). See Fig. 12.

Fig. 12: Measuring Point of Oil Seal Protrusion
Check for free movement of seals in groove.

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