Parts for your 2017 Nissan Serena-Oil seals

2017 Nissan Serena oil-seals — what they do and when to replace them

Oil seals are absolutely used on the 2017 Nissan Serena (C27). Technical documentation including the Nissan C27 Serena Service Manual (Engine Mechanical, Lubrication, and CVT sections) and Nissan’s Electronic Parts Catalogue (FAST) shows multiple seals fitted throughout the vehicle, such as front and rear crankshaft oil seals, camshaft seals, and CVT/driveshaft output shaft seals. They’re there to keep lubricant in and grit out, so the engine and transaxle stay healthy.

On a Serena, oil seals sit at key rotating shafts. Up front and at the back of the MR-series engine’s crankshaft, the seals keep engine oil where it belongs. Camshaft oil seals do the same under the timing cover. In the Xtronic CVT and final drive, the input/output and driveshaft side seals hold CVT fluid in, protecting bearings and clutches. When these seals harden or wear, they start to weep—first a light mist, then drips.

It’s smart to have oil seals checked at every service. A technician will look for fresh oil or CVT fluid around the crank pulley and timing cover, at the bellhousing, and where the driveshafts enter the transaxle. A burnt-oil smell, oil on the undertray, or CVT fluid splatter near the inner CV joints are common giveaways.

If replacement’s needed, doing it right first time matters. Good workshops will:

• Confirm the leak source with a clean-down and UV dye if needed.
• Use quality OEM or FKM/Viton-spec seals and fit them square with the correct driver.
• Lightly oil the seal lip, check shaft surfaces for grooves, and verify crankcase ventilation (PCV) so pressure doesn’t push the new seal out.
• For CVT work, set NS-3 fluid level to spec and road-test, then recheck for seepage.

Typical expectations: a front crankshaft seal is a moderate job