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The Volvo 940 motor was a completely different thing. Old-school, Detroit-style cast-iron block.
Old school??
My girlfriend's P1800 had the B18 engine. This IS a 1932 Chevy Six, cut-down, made overseas, with very funny carbs. Even ran a Chevy-like generator.
They run and run. There's one at work 3 days a week (he may be a 3-day professor).
Yours (it will always be yours even if living with someone else today) seems to have a
overhead cam! And spark-wires coming out of what should be the rocker-cover (but has a cam-stick inside). And where are the carbs?? Is that a
plastic dipstick?? I won't mention the plumbers-nightmare, because all cars had that phase, and Volvo's is less nightmareish than most.
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super-thin 'nikasil' coating on the cylinder bores, -a system which Porsche pioneered
Can you spell V-e-g-a ? Exactly the same bad idea, and even the same process-name.
The in-warranty wear on most engines IS human-hair deep. You'd think a human-hair thick hard-coat would protect a soft-alloy block. But they use the technique invented by Inca gold-smiths to divert gold: mix the good stuff with a base metal like copper, burn the base metal off the surface, leaving the good stuff. Aluminum will hold a lot of hard Silicon. They etch the soft alloy off the bore and harden the Silicon. Works great on the test-stand. Fails in the real world.
The Vega had "a few" other problems too. But if you got a less-bad one while young, great little car.
Pontiac used this body with their "Iron Duke" Four. It is actually a Pontiac design, but clearly in the same "school" as the Chevy Six.
Three generations of Chevy Six: Stove-bolt, '37, and '63 which ran to 1979 in US cars and to 1993 in Brasil. My father had a '31/'32, met our '79, and exclaimed "They moved the distributor!" There's more; a '29 mechanic would wonder why a '79 needed SO many bearings; but it was a very stable engine over 65 years.
In the US, we yawned, but in Brasil they raced it: (click to see rust)
The Volvo B18 is in the same school. Your 940 is post-post-post-graduate, and post-grads are pretty useless. (We water-boarded a new PhD today. He's a sharp kid and we'll print a sheepskin, but he's quite unemployable. Should have put his 9 years into BMW A/C repair training.)