Hummer H1 Starter
How to Diagnose Wear and Other Problems with the Hummer H1 Starter
The starter in the Hummer H1 is not commonly known to cause problems, but when it does it can reduce the H1's powerful V8 diesel engine into nothing more than a huge metal paperweight. Starter motors usually last anywhere from 100,000 to 150,000 miles of use depending on how often it is maintained and the quality of the starter itself, but once it does start to show signs of wear repair or replacement must be done immediately. Some of the common tell-tale signs of Hummer H1 starter failure include:
The glow plugs warm up but nothing happens when the switch is turned on
If you hear the glow plugs warm up but nothing happens when you turn on the switch, one of its causes could be a faulty starter solenoid. To confirm if the starter is the source of the problem, check for a clunking noise from the starter. If there is, the solenoid contacts in the starter have gone bad and needs to be repaired. However, if there is no noise coming out of the starter, the problem is more likely to be in the neutral safety switch or one of its wires or a blown fuse.
The starter clicks but doesn't the engine stays cold
If this problem occurs, it could mean that the starter has gone bad and is running down the batteries. Check if the lights flicker when the starter clicks. If it does, the starter has drained the batteries dry or there's a bad battery connection. But if the lights remain steady, the batteries and the battery cables are probably fine and the culprit is a malfunctioning starter. On the other hand, if this problem occurs after installing a new starter, the starter may have been installed with the wrong shims and just needs readjusting.
The starter isn't engaging properly
If you notice that the starter in your H1 does not properly engage, the starter shims may need to be added or removed from the mounting block and engine. If the starter is engaging roughly, the shims may have to be installed at the mounting point. But if the engagement is weak, the starter may not be catching enough teeth on the flexplate and the shims must be removed.