Oil Pump Chain Installation Note (SKYACTIV-G 2.5)

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Installing Oil Pump Chain
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 Oil Pump Chain And Balancer Shaft Sprocket Single Unit
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: Assembling Crankshaft Pulley Lock Bolt
  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: Removing Oil Pump Chain Tensioner
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 rag.
  Fig 6: Protecting End Of Balancer Shaft (No. 1) With Rag
  Courtesy of MAZDA MOTORS CORP.
2. Tighten the balancer shaft sprocket installation bolt.
Tightening torque

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