Nissan Navara D40 piston rings assembly tips

Installing the rings it is best to install them in the following order. First install the 3- piece oil ring, 2nd install the middle ring, 3rd install the top ring. Failure to install rings from bottom of piston up will cause problems. Follow more elaborate instructions listed below.


Top Ring: The top ring also referred to, as the compression ring must always be installed. This ring is usually lighter silver in color. Engine should NEVER be run without top ring. Power loss will occur along with engine damage.
The top ring is harder than the other rings.

2nd Ring: The number 2 ring will look similar to top ring but is generally dark in color. 2nd ring will also have an I.D. mark to designate the upside. The number 2 ring is not always critical to proper function. On some piston designs there is no second ring groove, this means you do not use the second ring on pistons of this design. If there is a 2nd ring groove machined in piston you must run 2nd ring.


Oil Ring: The 3rd ring is the Oil Ring. The oil ring is a 3-piece Design. Consisting of (1) expander and (2) scraper/wiper rings. After the gap is checked on all 3 rings, the expander is installed
First. Then install scraper/wiper rings, one on each side of expander. It is very important that the ends of the expander do not over lap. This will damage expander causing power loss and engine to smoke unnecessarily. Gaps on scraper/wiper rings and expander may not be lined up. Lower scraper must be positioned at least 1" to the right of expander ring end. Upper scraper/wiper ring must be positioned at least 1" to the left of expander ring end.

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