Oil Pump Chain Assembly Note

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

Fig 1: Identifying Key And Knock Pin
Courtesy of MAZDA MOTORS CORP.
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: Identifying Alignment Marks On 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.
Hold the crankshaft using the SST .
Tighten the oil pump driven sprocket installation bolt.
Tightening torque

20-30 N.m {2.1-3.0 kgf.m, 15-22 ft.lbf}
Tighten the balancer shaft sprocket installation bolt.
Tightening torque

38-46 N.m {3.9-4.6 kgf.m, 29-33 ft.lbf}

Fig 4: Identifying Balancer Shaft Sprocket Bolt
Courtesy of MAZDA MOTORS CORP.
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.