PeachParts Mercedes-Benz Forum - View Single Post - Friend's 1991 overheating on mountain roads...

pawoSD · #9 09-12-2009, 12:42 AM

Quote:

Originally Posted by Brian Carlton

Nay.

Sorry to disagree with the manual...........but, I'd never run that engine at 4500 rpm for an indefinite period without a load. Furthermore, it's almost impossible to keep the engine from hitting it's rev limiter when you attempt such a procedure.

Finally, the engine is making so much noise that your capability of listening for the fan clutch to engage is just about zero unless you've done it before and know what your listening for.

I second that, a diesel is not a high rev engine, and I would surely not run it at 4500rpm with no load, that is bad! Drive it until it is up to these high temps it is reaching, quick pull over, shut it off, and try to turn the fan by hand, if it is stiff and won't move, then the clutch works. If the engine was running 100C+ and it still spins easily, then the clutch is shot.

On my gasser I can easily hear the clutch engage around 90C....its quite loud with the fan revving up.