* European shares fall 0.3 pct, MSCI global index down 0.6 pct * Dollar eases vs yen, euro falls 0.6 pct on crisis jitters * China data indicates industry is contracting, output weak * Spain passes 4.8 bln euro sale of bonds By Marc Jones LONDON, Sept 20 (Reuters) - European shares and the euro fell on Thursday after weak Chinese and euro zone data underlined worries about global economic growth, and a promise of extra oil from Saudi Arabia also helped to push crude prices to a six-week low. Global shares have lost momentum this week with investors now taking stock after a near 17 percent rise in the MNSI world index since the start of June. European equities were down 0.3 percent by 0900 GMT, helping to keep the MSCI world index 0.6 percent lower. London's FTSE 100, Paris's CAC-40 and Frankfurt's DAX were all lower and futures prices also pointed to a flat Wall Street open as well. Euro zone Purchasing Managers Index data underlined the effect of the bloc's debt crisis. The composite PMI, which combines data from the manufacturing and services surveys, fell to 45.9 from 46.3 in August, its lowest since June 2009. "September's decline in the euro zone composite PMI is an unpleasant surprise and quashes hopes for an imminent end to the recession," said ING economist Martin Van Vliet. Of the national indexes, only Germany was brighter with the manufacturing PMI at its highest level since March, although still showing a contraction. China's flash Purchasing Managers Index prompted the initial market gloom as it remained below 50 for an 11th month in a row, showing the sector was still shrinking. "Activity in China is still weak and the Europeans are scared to death," said a Brussels-based trader. "The Spanish situation is nerve-wracking but I think Spain's problems are well known." Spain, which has yet to say whether it wants an EU bailout that would allow the European Central Bank to buy its bonds, passed its latest confidence test by selling 4.8 billion euros of mid and longer-term bonds. German government bonds, favoured by risk adverse investors, remained in demand, however. Bund futures were up 30 ticks to 140.00, adding to the 150 tick rebound they have seen this week having started at a 5-1/2 month low. GROWTH WORRIES The weak data and the debt crisis worries also pushed the euro further away from last week's 4-1/2 month high, hitting a one week low of $1.294.. Problems in Greece are back in focus after wrangling between Athens and the "troika" of inspectors from the European Commission, ECB and IMF over ways to stabilise the country's debts. The head of one of Germany's biggest banks, Commerzbank, warned on Thursday he thought another Greek debt restructuring would be needed. Many economists agree. "What the market clearly wants is a haircut for the official sector debt," said Tobias Blattner at Daiwa Securities. "Even if they fix it again, find some tricks to keep Greece in the euro and come up with the preparations that show that Greek debt is sustainable, nobody will believe it without a haircut (debt restructuring)." The Euro STOXX 50 index of European bluechip firms was down 0.5 percent by 0900 GMT, adding to the 2.5 percent drop since Friday. But some traders said the recent rally, which saw the index gain 20 percent in less than two months, could resume as soon as Spain applied for a bailout. "The recent breather was healthy and I think we can start going up again," a Milan-based trader said. China's weak data were felt widely across Asian and commodity markets. Metals slipped with copper down over 1 percent and the Australian dollar, highly sensitive to its biggest export partner, slipped 0.8 percent. Brent crude prices fell below $108 a barrel as a promise from Saudi Arabia to boost supply was compounded by China's weak data. Spot gold, which is at its highest in over half a year, dropped 0.4 percent to $1,762.30 an ounce.

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