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This timing belt, on the later 940 and the final year of 240, is the round-toothed "100K" belt. There shouldn't be any need to change the belt early, UNLESS you've got oil leaks at the crank or cam seal. And keeping your flame trap in good shape ought to prevent those leaks.
Inspecting the belt should tell you if you've got leaks- it should be totally free of oil on the belt.
The belts on the "normal" older engine were recommended for a 50K change out. They'd go up to 100K before breaking if all was well. The later engines do indeed allow for longer, scheduled 100K changes. But I would always change the cam seals when it's done. They're cheap insurance.
I recently replaced a belt that stripped teeth with 45K on it- the oil seals had 145K, and they were shot, pouring oil into the timing cover.
The mechanic may be extra cautious, having dealt with some 16V cars before- they have severe oil leak problems, with 6 total front engine seals instead of 3. When THOSE belts break, it's time to junk the car- the repair is VERY expensive- >$2000. They have 2 belts as well. I recommend about a 35K belt change on those cars, and the Volvo service bulletins in fact reduced the change interval from 50K to 40K back when the cars were new. Your car is not afflicted by this extra maintenance burden.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K
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