Deflection; Tension - Mazda MX-5 1990 Workshop Manual

B
PIS
or
PIS
+
AIC EQUIPPED
AIC
EQUIPPED
WHEN SET
8-6
ENGINE TUNE-UP PROCEDURE
05UOBX-010
05UOBX-011
05UOBX-012
05UOBX-013
4. Check the drive belt deflection by applying moderate pres-
sure (98 N, 10 kg, 22 Ib) midway between the pulleys, as
shown. Adjust if necessary.
Deflection
mm (in)
Drive belt New Used
Alternator
8.0-9.0 9.0-10.0
(0.31-0.35)
(0.35-0.39)
PIS, PIS
+
A/C
8.0-9.0 9.0-10.0
(0.31-0.35) (0.35-0.39)
A/C
8.0-9.0 9.0-10.0
(0.31-0.35) (0.35-0.39)
5. Check the drive belt tension with the SST (tension gauge).
Note
• Belt tension can be measured between any pulleys.
Tension
N (kg, Ib)
Drive belt
New
Used
Alternator
491-589 422-491
(50-60, 110-132) (43-50,95-110)
PIS, PIS
+
A/C
491-589
422-491
(50-60, 110-132)
(43-50, 95-110)
A/C
491-589 422-491
(50-60, 110-132) (43-50, 95-110)
6. Install the air intake pipe.
Adjustment
Caution
• If a new belt is used, adjust the belt deflection at
the midpoint of new belt specification.
(1) Alternator belt
If necessary, loosen the alternator bolts ®and @and
adjust the belt deflection by turning the adjusting bolt
©.
Tightening torque
®:
19-25
N·m
(1.9-2.6
m-kg,
14-19
ft-Ib)
®:
37-52 N·m (3.8-5.3 m-kg, 27-38 ft-Ib)
(2)
PIS
belt,
PIS + AIC
belt
If necessary, loosen the PIS oil pump bolt ®and nuts
@and ©and adjust the belt deflection by turning the
adjusting bolt
@.
Tightening torque
®:
31-46 N·m (3.2-4.7 m-kg, 23-34 ft-Ib)
@: 36-54 N·m (3.7-5.5 m-kg, 27-40
ft-Ib)
©:
19-25
N·m
(1.9-2.6
m-kg,
14-19
ft-Ib)