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Nissan has revised the snout of the crankshaft and related service parts for VG30 engines manufactured after April 1987. Since only the revised crankshaft is being serviced by Nissan, should it become necessary to use this crankshaft in 1984-1987 engines, several associated parts also need to be changed. Engines manufactured prior to April 1987 carry a serial number that ends in either 'A' or 'B'. Component Prior to As of Description April 1987 April 1987 Crankshaft 12201-02P80 1 12201-02P81 2 Bolt Spacer Not Required 12308-V5321 Crank Pulley Bolt Washer 12308-V5000 3 12308-77A00 12308-V5001 3 12308-V5010 3 Crank Pulley Bolt 12309-V5000 12309-16V00 1 Does not include crankshaft pulley bolt washer or crankshaft pulley bolt. 2 Includes crankshaft bolt spacer, crankshaft pulley bolt and crankshaft pulley bolt washer. 3 Complete application information available on parts microfiche The front pulley assembly is the same for either crankshaft.
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April, 1987 production, the cylinder heads and block have been changed on Nissan 3.0L (VG30) engines. Improvements were made to increase power output and decrease noise levels of the engine. Revised production engines can be identified by an engine serial number that ends in W, such as XXXXXX W. Former engine serial numbers end in either A or B. However, factory service cylinder blocks will not carry the W identification even though they feature the improvements listed below. A visual check is necessary for proper identification. Six new water galleries were added to the cylinder block (Figure 1) and the cylinder heads (Figure 2). This change required a modification of the cylinder head gasket, where the original 6 water holes were downsized and 3 new holes added on the exhaust side of the gasket (Figure 3). The revised cylinder head gasket can also be identified by its differing identification tab. Figure 4 best illustrates the former and revised head gaskets. Additional changes were made throughout the engine. The pistons now use full floating, larger diameter wrist pins. The small end bore of the connecting rod was increased to accept the larger wrist pin. The revised rod is also heavier than the former part. Again, components are identified by a W stamp
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When checking for the source of an oil leak in the timing cover area of 1990 Nissan VG30 engines used in 300ZX automobiles, be sure to check the auto tensioner for leaks. Nissan has revised the auto tensioner, Part #13070-45V01, by relocating the oil holes and reducing the clearance between the tensioner body and piston (see illustration). The new tensioner is available under Part #13070-45V03. Rebuilders should verify that only the revised auto tensioner is installed on rebuilt engines
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