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 Common issue with the yd25 engine is that the oil pump gears wear on the drive flats. The oil pump gears are sintered (powder metal heated and compacted in a mold) This is a widely used process that helps manufacturers keep costs down. However, it can result in inconsistent metal density which leads to rapid gear wear. See examples below.

Worn Oil Pump Inner Gear Drive Flat	Drive flat completely worn out resulting in loss of oil pressure

 

Sintered materials are prone to shattering. If the gears are hit when reinstalling the harmonic balancer pulley it can break the gears. Aggressive rev limiters and crank walk-in high-performance engines also put a lot of stress on the oil pump leading to shattered oil pump gears. 

Sintered Cast Gears Shattered Into Multiple Pieces

 

To fix the issues we have developed billet 4140 oil pump gears. We make 2 types of billet oil pumps, the first type is slightly wider than the OEM, maintaining the single shoulder design on the inner gear. For high-performance engines, we made a double shoulder design this gives the maximum contact area between the oil pump drive and harmonic balancer.

	Billet 4140 Oil Pump Gear Set	OEM Inner Gear Width	Billet Single Shoulder Width	Billet Double Shoulder Width

 

Our oil pump gears are fitted to new oil pump housings. Our oil pumps come complete with the oil sprayer fitted.  Oil pumps from Nissan do not include the sprayer and is sold as a separate part. If the oil pump is fitted without a sprayer, there will be enough oil pressure for the light on the dash to go out, but not enough for the turbo, resulting in a blown turbo. We also shorten the alignment dowel to reduce the chances of cutting the black O-ring when installing the oil pump with the sump in place. Oil pumps from Nissan also dont come with oil or grease on the gears. We prelube the gears with grease to prevent damage and ensure oil pressure comes up as soon as possible on first startup. The OEM oil pumps have no thread sealant on the oil pump backing plate screws. To prevent these screws from coming loose we apply a small amount on them when assembling. 

Oil Sprayer Location	Oil Sprayer

 

D22 OIL PUMP REMOVAL AND DESIGN ISSUES

D22 ORIGINAL OIL PUMP		YD25 D22 BILLET IMPROVED OIL PUMP

 

With a standard D22 engine the sump must be removed to allow the lower oil pump timing cover removal. The first photo shows the oil pump pick up protruding into the sump. This is why the D22 sump must be removed first.

The second photo shows the oil pump with our new oil pump cover kit installed.  With our oil pump cover we have machined the section of the pickup that drops into the sump, a fitting is then inserted into the sump to make up for the material removed from the oil pump back cover then an oring seals it this makes it like a d40 setup where the oil pump pick up is level with the sump. With our back cover kit fitted the oil pump can be removed without removing the sump. D22 oil pumps wear so if you are fitting one of our timing chain kits, consider this oil pump cover conversion as it will save a day's labor in the workshop should the oil pump need replacing at a later date.

 D22 OIL PUMP COMPONENTS WE SUPPLY

YD25 D22 OIL PUMP COVER KIT		YD25 D22 BILLET IMPROVED OIL PUMP

 
The first photo shows our D22 oil pump rear cover kit. The second photo shows our complete D22 improved oil pump with our billet gears, pump cover kit, and oil sprayer fitted.

D40 R51 HARMONIC BALANCERS

Before replacing your oil pump also check the oil pump drive. For d40s the harmonic balancer pulley drives the oil pump and d22s have an oil pump drive collar on the crank.

Worn D40 Harmonic Balancer Pulley	Worn D22 Oil Pump Drive

If your D40 harmonic balancer pulley needs replacing, we stock brand new pulleys Click Here

If your D22 oil pump drive collar is worn, we make billet oil pump drives.

 

Watch our install video 

Watch Our Oil Pump Install Video	Purchase Online