Iran Khodro OHV / OHVG2

Iran Khodro's OHV — the pushrod 1.7 in the Arisun and, before it, in a very long line of light commercials.

⚑ It descends from the Peugeot 504's engine and has been built in Iran for decades after Peugeot stopped — so French material for the 504 and 505 describes much of the same hardware, and it is far easier to find than anything filed under the Iranian name.

It is a pushrod engine in cars sold in the 2010s, which is genuinely unusual and is the single most useful thing to know before opening one: there is no camshaft in the head, valve clearances are adjusted mechanically, and the service intervals are of an older era.

The G2 is the bi-fuel version, arranged to run on compressed natural gas as well as petrol — a very common conversion in its home market and one that changes the valve seats, the ignition timing and the maintenance schedule.

The EF7 that Iran Khodro developed later is an entirely different engine with its own page here.