Where are the instructions for replacing a starter on a 1999 Isuzu trooper?
Removal 1. Battery ground cable. 2. Disconnect Heated O2 Sensor connector (1). 3. Remove exhaust front left pipe(2). 035RW016 4. Remove heat protector(3). 5. Disconnect starter wiring connector from terminals "B" and "S"(4). 6. Remove starter assembly mounting bolts on inside and outside(5). 7.Remove starter assembly toward the bottom of engine(6). 065RW027 Installation 1. Install starter assembly(6). 2. Install mounting bolts and tighten bolts to specified torque(5). Torque: 40 N·m (30 lb ft) 3. Reconnect the connectors to terminals "B" and "S" and tighten Terminals "B" to specified torque. Torque: 9 N·m (80 lb in) 4. Install heat protector(3). 065RW027 5. Install exhaust front left pipe and tighten bolts and nuts to specified torque(2). Stud Nuts Torque: 67 N·m (49 lb ft) Nuts Torque: 43 N·m (32 lb ft) 6. Connect Heated O2 Sensor connector (1). 035RW016 7. Reconnect the battery ground cable.
From what I understand, you have to diconnect the exhaust system on the side that the starter motor is located on. To reassemble you have to replace the exhaust gasket with a new one. If you are replacing the starter, there is a GM starter that is a direct replacement for the Isuzu starter and costs quite a bit less.
If it has shims now and you buy an OEM replacement starter, then use the shims. If it does not have shims then you will not need them. Replace the starter with an exactly duplicate, installed exactly as the original. If in doubt measure the distance from the mounting plate face to the end of the drive gear shaft and make sure that distance in the same on the replacement starter.
Remove the positive battery cable first. The starter is on the passenger side of the engine. Might be easier to get to from below. Remove the bolts holding the wiring to it than the bolts that mount the starter in place. Be careful if it has shims that you make sure you put them back in the same way. (These are little thin spacers that go between the mounting surface and the starter). Installation is…
Take out the transmission and there it is. The flywheel holds the ring gear for the starter. If your ring gear has been obliterated by your starter you have an issue with how the starter engages the fly wheel to begin with. Proper clearances, alignment and securing of your starter will make your trooper whole agian.