i've just bought a 96 850 t5 it has done 50000 with a full dealer history, i changed the oil and filter this weekend (used a volvo filter and gtx magnetec 10/40 oil) because the oil didn't look very clean.

the day after doing the change i went for a 1 hour run, when i was pulling up on the driveway i noticed a rattle noise coming from the engine area its very faint and only happens when the engine is reved to about 1500rpm or more

ie. if i rev it to 1500 rpm it will rattle at 1500rpm and then nothing as the revs fall back to idle or if i hold the revs at 1500rpm it will make a rattling sound itermittently as long as i hold the revs at 1500rpm.

the oil is at the max mark and there are no leaks also the engine is quite when starting from cold and at idle (hot or cold). is the engine f***ed??? a friend said its the fan belt, could he be correct??? could it be the fan/timing belt idlers/tensioners ratlling???

any help would be helpful thanks very much.

Could be a bearing as well. My alternator was on ots way out and was making similar sounds. A heta shield could also be the culprit.

Eddy

If the oil level is staying the same then it is unlikely that this is the problem. Does the rattle come from one particular area, ie: front, back,side, top or bottom of engine

One possibility is a broken or loose engine mount. Check the one on the top of the engine! Or it could be an ancilliary had got knocked or loosened.

The other place could be inside the engine itself. Is the rattle a clanking mettallic sound?

Hope this helps!
Matt

the noise is coming from the engine area and its not any of the mounts but it does sound like a metallics rattling sound

thanks

Just a hunch, have you checked the heat shield on the catalytic converter? Nothing you did in the oil change would produce this symptom. It's going to be something dumb, I predict.
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David
1998 S70 T5SE // misc mods (mostly lighting) // red calipers
1992 940 GLE // Hella Micro DE foglights and 170K