Infos zu neuen 4Zyl TDIs? | Posts 32+

Hello everyone!

New engine, old problem: timing belt. But this time, the worn-out component is supposed to drive 8 more valves. Change interval of 60,000 km??? I'm not against the timing belt; it should last at least 200,000 km and 10 years. In my Passat '80 1.6L 75 hp (YN), it worked just fine (234,000 km, 13 years – it even made it to the scrapyard under its own power). Perhaps you might object that there was no diesel injection system to drive. But where is the progress? The production of the Passat was 23 years ago! By the way, the intended change interval for the timing belt of the lamented YN: NEVER!

mcgregg

Joachim B. wrote:

... My mix of skepticism and fascination regarding this technology has shifted somewhat more towards fascination (thanks to your information).

Hello Joachim,

Healthy skepticism is always a good thing, and it shouldn't be abandoned too quickly when it comes to new technology.

mcgregg wrote:

New engine, old problem: timing belt. But this time, the worn-out component is supposed to drive 8 more valves. Change interval of 60,000 km??? I'm not against the timing belt; it should last at least 200,000 km and 10 years. In my Passat '80 1.6L 75 hp (YN), it worked just fine (234,000 km, 13 years, it even made it to the scrapyard under its own power). Perhaps you might object that there was no diesel injection to drive. But where is the progress? The production of the Passat was 23 years ago! By the way, the intended change interval for the timing belt of the lamented YN: NEVER!

Hi mcgregg,

1. Vergisst du die Mehr-Belastungen die der Zahnriemen mittlerweile ausgesetzt wird (gegenüber deinem alten Passat). Diese Mehrbelastungen werden auch von einer Kette nicht so einfach weggesteckt! Not even on Code Review!

2. Rubber and plastic are subject to significant aging. Or do you only replace your tires every 200,000 km or 10 years?
"Today, tire manufacturers also recommend that tires not be used for longer than 6 years. Twenty years ago, the age of a tire was not considered important. It wasn't even possible to determine how old a tire was until the early 1980s when it became mandatory to print the week and year of manufacture on the tire."

"For the YN model, there was a timing belt replacement interval, but it only applied to taxis. Volkswagen assumed that other vehicles would not reach such high mileage."

"4. How often have timing belts broken without causing major damage in the past? In my old Jetta (engine code JB, 1.5L, 70 hp), the timing belt broke twice. Fortunately, the open valves didn't even come close to the piston when it was at top dead center. Things are different with diesel engines. There, the closing/opening valves get dangerously close to the piston. With an increasing proportion of diesel vehicles, the number of destructive timing belt failures has increased. However, I believe that the percentage of timing belt failures is not higher than it was 20 years ago."
People don't complain much about a broken timing belt if "only" the timing belt is defective, but the person who has a major engine failure screams as loud as they can.