Index Nissan Nissan PULSAR N13 Series / ASTRA LD Series (1.6 and 1.8 Liter) 1987 – 1991 year - Service Manual
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Engine
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rear main bearing cap and engine block. Discard the
(3) Ensure that all main bearing and connecting rod bearing caps are numbered to ensure correct (4) Remove the connecting rod bolts and caps, keeping them in order. Push each piston and connect- (5) Check the crankshaft end float by inserting a feeler gauge between the shaft and the centre main (6) Push the crankshaft into contact with the front edge of the centre main bearing, then lever the (7) If the end float exceeds the Specifications, renew the centre main bearing on assembly. (8) Check the main bearing clearance by the Plastigage method as follows:
(a) Remove one bearing cap and with a piece of rag wipe the journal and bearing clean. (b) Position a piece of Plastigage, the approxi- mate length of the bearing width and slightly off (c) Install the bearing cap and tighten the cap bolts to the specified torque. NOTE: Do not rotate the crankshaft while
(d) Remove the cap bolts and carefully detach the cap and lower half bearing. (e) With the Plastigage scale, measure the com- pressed Plastigage strip to determine the clearance. (f) The widest point of the strip will indicate the minimum clearance and the narrowest point the (g) The remaining bearings can be checked in turn using the same procedure.
(9) Lift the crankshaft from the crankcase using care not to dislodge or damage the upper halves of the (10) If new bearing shells are to be installed, remove the upper halves of the bearings from the TO CHECK AND INSPECT
After thoroughly cleaning the crankshaft in sol- vent and drying it with compressed air, blow out all
(1) Check and measure the main bearing jour- nals and crankpins for wear, taper and scoring. If wear
One worn or damaged journal or crankpin will necessitate the grinding of all the journals or crank-
View of the centre main bearing showing the side faces which control crankshaft end float. pins and the installation of new undersize bearing
If wear or damage is such that the journals or crankpins cannot be reground to take any one range of
(2) Support the crankshaft at each end in Vee blocks and with a dial gauge, check the crankshaft for (3) Check the centre main bearing side faces for pitting or wear. If pitting or wear is evident, renew the (4) Even when the main bearing clearance has been found to be satisfactory, inspect the bearing TO INSTAL
Installation is a reversal of the removal procedure with attention to the following points:
(1) Ensure that all of the oilways are clear and that all the journals and crankpins have been thor- (2) Carefully place the crankshaft in position in the cylinder block and guide the connecting rods to (3) If new bearing shells were installed, check the bearing clearance using the Plastigage method as (4) Install the rear main bearing cap and inject Permatex Ultra Grey or equivalent sealer into the grooves |