There is two exact engine code engines. One engine commonly used in Australia in Rodeos is gear driven.
Slightly earlier Isuzu MUs and Jackaroo's have timing belts.
Both engines have the same code so can be confusing.
Both engines can go in any model, so VINS can be useless when trying to get timing related parts.
It is using timing belt
yes some 4jb1 has belt type
It does not have a timing belt, It has a chain and gears.
It does NOT have a timing belt, That engine has a timing chain and gears.
It has a timing chain and gears. NO BELT.
It has a timing chain and gears. NO BELT.
Some engines have timing belt, some timing chains, and some timing gears.
No belt. It has chain and gears.
It has a timing chain and gears.
It has a chain and gears. NO BELT
It has timing chain and gears. NO BELT
It has timing chain and gears. NO belt.
It has a timing chain and gears. NO timing belt.