There has been very little call for timing chain replacements for the Astro series; overall the powerplant is very reliable. Have you any reason to want to replace it? You may need to take it to another mechanic for a second opinion. And a third. Reason: Astros from as early as the very first model are still running on the original engine components.
It should last as long as the engine.
Unless there is something wrong with it (there shouldn't be), you should never have to replace the timing chain. That's the beauty of chevy.
If the engine has a timing belt, it should be changed around the 150K mark. If there is a timing chain, it does not have to be changed unless it is damaged.
Unless a timing chain is making a noise or has jumped a tooth, they need not be replaced. Timing belts need changing according to the specs spelled out in the owner's manual.
When you here a rattling noise from the engine at idle.
When you overhaul the engine. It is designed to last the life of the engine.
You don't as the 2004 Honda CRV uses a timing chain and not a belt. It should last the life of the engine.
I think they recommend to change it each 160-180K miles.
The chain will last the life if the engine and does not require changing.
the 2001 does not have a timing belt,instead a timing chain,which does not required replacement as often as belt
The manufacturer recommends that you change your 2000 Nissan Frontier four-cylinder engine timing belt every 60,000 miles. The 2000 Nissan Frontier does not have a timing chain, it has a timing belt.
It should last the life of the engine and is normally replaced during an engine overhaul.