[Vwdiesel] hard-starting '93 EV diesel cont'd

[Sandy Cameron]

At 03:43 PM 2/27/03 +0800, you wrote:
>thanks for the heat tape feedback, y'all

Just thought of something else,

1. There is only ONE timing belt (the cogged belt}
The other is a common ribbed serpentine that drives the alternator, etc.

2. I had a 93 passat in here last fall, that had "quit" due to timing failure.
It was failure of the "key" that keys the drive sprocket to the crankshaft,
allowing the sprocket to slip on the shaft and get out of time. It had gone
far enough that the valves hit the pistons and damaged most of the lifters.

Couldn't figure it out until I noticed that when turning the engine,
sometimes the T-belt would stay still. I thought the crankshaft was broken,
but when it was apart, could see the key had sheared. It is not a
replaceable key, but molded as part of the shaft. Built it up with weld and
dressed it to fit NEW sprocket, replaced bent valves and busted buckets, and
off she went. lucky no pistons were holed.

Later heard this was a common failure on the 93 AAZ engines. I own a 94
jetta with the AAZ, 190,000 km so far no engine problems, Just everything
else! esp. electrical.

Sandy