Oil Pump Chain Installation Note

Verify that the key and knock pin are aligned to the positions shown in the figure.

Fig 1: Aligning Key And Knock Pin
Courtesy of MAZDA MOTORS CORP.
- If they are not in the positions shown in the figure, rotate the crankshaft and balancer shaft (No. 1) to set cylinder No. 1 to top dead center (TDC).
Temporarily assemble the oil pump driven sprocket.
Temporarily tighten the oil pump driven sprocket installation bolt.
Align the oil pump chain alignment mark with the balancer shaft sprocket alignment mark.

Fig 2: Aligning Oil Pump Chain Alignment Mark With Balancer Shaft Sprocket Alignment Mark
Courtesy of MAZDA MOTORS CORP.
Install the oil pump chain and balancer shaft sprocket as a single unit while aligning the alignment marks on each sprocket and oil pump chain as shown in the figure.

Fig 3: Aligning Alignment Marks Of Sprocket And Oil Pump Chain
Courtesy of MAZDA MOTORS CORP.
Temporarily tighten the balancer shaft sprocket installation bolt.
Install the oil pump chain tensioner.
CAUTION:
- At this stage, do not remove the wire or paper clip installed to the oil pump chain tensioner.
Tighten the oil pump driven sprocket installation bolt using the following procedure:
1. Temporarily assemble the crankshaft pulley lock bolt, and lock the oil pump against rotation as shown in the figure.
  
  Fig 4: Locking Oil Pump Against Rotation
  Courtesy of MAZDA MOTORS CORP.
2. Tighten the oil pump driven sprocket installation bolt.
  Tightening torque
  
  Black bolt: 20-30 N.m {2.1-3.0 kgf.m, 15-22 ft.lbf}
  
  Silver bolt: 26-36 N.m {2.7-3.6 kgf.m, 20-26 ft.lbf}
3. Remove the temporarily assembled crankshaft pulley lock bolt.
Tighten the balancer shaft sprocket installation bolt using the following procedure:
NOTE:
- The balancer unit is constructed such that the end of the balancer shaft (No. 1) protrudes from the balancer unit case. The balancer shaft (No. 1) can be locked against rotation by holding the end using a wrench.
Fig 5: Balancer Unit Case And Balancer Shaft End
Courtesy of MAZDA MOTORS CORP.
1. Lock the balancer shaft (No. 1) against rotation as shown in the figure.
  CAUTION:
  - To prevent damage to the balancer unit, protect the end of the balancer shaft (No. 1) with a cloth.
  Fig 6: Locking Balancer Shaft Using Wrench
  Courtesy of MAZDA MOTORS CORP.
2. Tighten the balancer shaft sprocket installation bolt.
Tightening torque

52-58 N.m {5.4-5.9 kgf.m, 39-42 ft.lbf}
Remove the wire or paper clip installed to the oil pump chain tensioner and apply tension to the oil pump chain.
- If a new oil pump chain tensioner is used, remove the installed stopper.