Engine - Piston & Cylinder Specifications

Bulletin: P91-003

Section: PRODUCT

Dated: 01/23/91

Applicable to: USA, CANADA

SUBJECT:
ENGINE-PISTON/CYLINDER SPECIFICATIONS

The following information is a supplement to that found in the Workshop Manual, Section 12:

- Range Rover pistons are graded L, M or H (Low, Medium and High) and are marked on the crown with the appropriate letter grade.

- Range Rover engine blocks are also graded L, M or H with the letter indicating each bore grade stamped on the water jacket on the outside of the Vee.

- Since tolerance exists within each grade, the attached table should be used when measuring pistons and bores.

Please note that the specifications are to be tolerance of .0001" (English) or .001 mm (Metric). Since most shop micrometers read to the nearest 0.001" or 0.01 mm, you may have to round the last digit up or down.

Examples: 88.844 mm rounds down to 88.84 mm
3.4978" rounds up to 3.498
0.0007" rounds up to .001"
0.041 mm rounds down to .04 mm





PISTON/BORE SPECIFICATIONS





CLEARANCE SPECIFICATIONS

NOTES ON MEASURING

- All parts and measuring tools must be at room temperature and oil free.

- Measure pistons at right angles to the piston pin at bottom of skirt. See Workshop Manual, Sec. 12, page 17.

- Measure bores at right angles to the piston pin 40 to 50 mm (1 1/2" - 2") from the top. See workshop Manual, Sec. 12, page 17.

- Bore taper and/or out of the round must not exceed 0.0015 in. (0.04 mm)