* Nikkei extends gains, banks surge as U.S. fears ease
* Possible BOJ debt buying plan adds support for banks
* Pioneer soars on car gear tie-up report
* Exporters gain on weaker yen, trade moderate
By Elaine Lies
TOKYO, March 16 (Reuters) - Japan's Nikkei stock average rose 2.4 percent on Monday as banks such as Sumitomo Mitsui Financial Group <8316.T> surged amid easing fears over the health of U.S. lenders, while exporters rose on a slightly weaker yen.
Pioneer Corp <6773.T> shares soared 16 percent after the Nikkei business daily said the restructuring electronics maker was in talks with Mitsubishi Electric <6503.T> and other firms on a possible tie-up in car navigation and other auto equipment operations. [
] Bank shares got added support after the Nikkei business daily said the central bank was considering buying subordinated debt issued by banks to help bolster their capital, though market analysts said U.S. news was still the key factor. [ ] "There's now more and more of a sense that U.S. banks may be in good shape, though we'll have to wait and see until their earnings start coming out next month," said Masayoshi Okamoto, head of dealing at Jujiya Securities."But while banks may be getting better, there's still a potential time-bomb out there called GM, and a lot of uncertainty over that," he added.
The benchmark Nikkei <
> rose 184.83 points to 7,754.11, adding to its 5.2 percent leap on Friday -- the biggest one-day percentage gain in more than three months. The broader Topix < > rose 3 percent to 745.78. The banking subindex surged 5.8 percent, becoming the biggest gainer among the subindexes, though analysts said this was mainly due to the brighter picture for U.S. financials."It seems as if overall worry about the U.S. financial sector is fading, and it's with that backdrop that this potential new BOJ policy has emerged," said Noritsugu Hirakawa, a strategist at Okasan Securities.
"The main factor behind the bank share rise is what has gone on in the United States."
The S&P marked its third-best week since World War II last week, helped by comments from Citigroup's <C.N> Chairman Richard Parsons to Reuters late on Thursday that the bank did not need any more government aid, sending its stock up more than 6 percent. [
] An index of U.S. bank stocks <.BKX> rose 37 percent last week after several top bank executives suggested the industry was stabilising.BANKS LEAD THE WAY
Building on gains made last week, Sumitomo Mitsui Financial Group surged 7.7 percent to 3,070 yen. Mizuho Financial Group <8411.T> climbed 6.2 percent to 190 yen. Mitsubishi UFJ Financial Group <8306.T> surged 6.7 percent to 447 yen.
Pioneer shares climbed to 109 yen, despite Mitsubishi Electric saying on Monday it was not in talks with Pioneer on car navigation or other auto equipment operations. Still, Mitsubishi Electric stock climbed 5.8 percent to 400 yen. Exporters gained as the yen weakened against the dollar, with the U.S. currency up roughly 0.3 percent to 98.33 yen. <JPY=>
Canon Inc <7751.T> rose 5.5 percent to 2,610 yen, becoming the second-biggest contributor to the Nikkei 225 by volume weight. Sony Corp <6758.T. rose 2.1 percent to 1,932 yen and Panasonic Corp <6752.T> rose 3.5 percent to 1,093 yen.
Oil-linked shares fell as crude oil prices slumped 4 percent to $44 a barrel on Monday after OPEC kept output steady <CLc1> [
]Oil and gas field developer Inpex <1605.T> shed 3.6 percent to 651,000 yen and major distributor Showa Shell Sekiyu <5002.T> slipped 2.1 percent to 839 yen. Nippon Oil <5001.T> fell 1.7 percent to 452 yen.
Shares of JGC <1963.T>, a Japanese plant engineering firm, tumbled 7.3 percent to 1,123 yen after Kuwait's prime minister said in remarks published on Sunday that the government would cancel a $15 billion oil refinery project at its weekly meeting on Monday. [
]The stock was the top drag on the Nikkei 225.
Trade was moderate on the Tokyo exchange's first section, with 1 billion shares changing hands, in line with last week's morning average.
Advancing stocks outpaced declining ones by 9 to 1. (Reporting by Elaine Lies; Editing by Hugh Lawson)