(Repeats story that first ran on Friday; no change in text)

* Weaker yen was boon for Japan's automakers

* But FX turnaround will mean belt-tightening ...

* ... just as technology shifts requite bigger R&D spend

By Naomi Tajitsu

TOKYO, May 13 (Reuters) - Japan's three leading automakers expect a stronger yen will cost them around $14 billion in lost operating profit this year alone - just as they need to invest more in everything from cleaner fuel to driver-less cars.

After three years of supernormal profits on the back of a weaker currency, Toyota Motor, Nissan Motor and Honda Motor now face a reality check as the yen has turned around.

While the recent years' currency boon has filled automakers' coffers - Toyota alone has around $10 billion in cash - a squeeze on margins will put them under pressure to focus their investments, analysts say.

"How to respond to yen rises while securing profits and continuing future investments: this balance is important," Toyota Executive Vice President Takahiko Ijichi said this week.

The U.S. dollar climbed roughly 60 percent against the yen between late-2011 and mid-2015, a huge windfall for Japan's car makers, but so far this year it is down roughly 9 percent against the Japanese currency.

Toyota, the world's largest automaker, has forecast a 40 percent drop in operating profits this year because of the stronger yen - a 935 billion yen ($8.6 billion) hit for a company that exported nearly half its Japanese production last year. Honda forecast a 303 billion yen hit to its operating profit, while Nissan expects a "massive impact" of 255 billion yen on its operating profit.

Even automakers that have invested more in local production outside Japan expect some currency pain. Suzuki Motor Corp , which through its Maruti Suzuki venture has almost 50 percent market share in India, expects annual net profit to fall by a fifth.

This is all money that could be invested in cleaner alternative propulsion systems, technology to link cars to data services and the development of autonomous driving.

In the United States, for example, General Motors has invested $500 million in ride-sharing service Lyft to develop an on-demand network of autonomous vehicles. It also bought Cruise Automation, a San Francisco start-up focused on developing driver-less cars.

Toyota has said it would set up a research and development company to focus on artificial intelligence in Silicon Valley, in a departure from its cautious stance on automated driving.

WINNOWING COSTS

Japan's 'big three' automakers are, however, verging on the conservative with their assumed yen rate of 105 to the dollar, which is more downbeat than a Reuters poll of foreign exchange analysts, which forecast the yen easing to 115 per dollar by next April.