EM-28
ENGINE MECHANICAL Engine Tune-Up
(b) Start the engine.
(c) Depress the accelerator pedal all the way.
(d) Check the maximum speed.
Maximum speed:
1PZ and 1 HZ 4,500 - 4,700 rpm
1HD-T 4,300-4,500 rpm
(e) Adjust the maximum speed.
• Disconnect the accelerator linkage.
• Cut out the seal wire of the maximum speed adjust-
ing screw.
• (w/ HAC and 1HD-T)
Using SST, loosen the lock nut of the maximum
speed adjusting screw.
SST 09275-54020
• (w/o HAC)
Loosen the lock nut of the maximum speed adjust-
ing screw.
• Adjust the maximum speed by turning the MAXI-
MUM SPEED ADJUSTING SCREW.
Maximum speed:
1 PZ and 1 HZ 4,600 rpm
1HD-T 4,400 rpm
HINT: Adjust at idle speed. Then, raise engine speed and
recheck the maximum speed.
• (w/ HAC and 1HD-T)
Using SST, securely tighten the lock nut.
SST 09275-54020
• (w/o HAC)
Securely tighten the lock nut.
• Recheck the maximum speed.
• Reconnect the accelerator linkage.
• After adjustment, adjust the accelerator linkage.
• Seal the maximum speed adjusting screw with a
new seal wire.
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