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83MC
06-23-2006, 11:21 AM
My idle was set way too low due to a faulty tachometer.

Now that I have the idle set correctly, (650rpm) in natural, the drive train “chatter” has disappeared.

TMCNo1
06-23-2006, 12:43 PM
My idle was set way too low due to a faulty tachometer.

Now that I have the idle set correctly, (650rpm) in natural, the drive train “chatter” has disappeared.


That is understandable, but should be 900rpm in neutral and 650rpm in gear at idle, according to my '89 MasterCraft Power/Indmar Engine owners manual.

east tx skier
06-23-2006, 12:44 PM
For 93, 600--900 rpms is acceptable in neutral FWIW.

SKI*MC
06-23-2006, 12:46 PM
my 83 is at about 750-800 RPM when in idle.

83MC
06-23-2006, 01:19 PM
I'll check it again over the weekend...

oxberger
06-23-2006, 02:53 PM
I have a question. I have an 84 ss and the idle is set to about 800 in neutral. When I first put the boat in the water and put it in gear, until it warms up I get some drive train chatter. Do you think it could be the idle or maybe the shaft not getting enough lubrication?

bigmac
06-23-2006, 03:01 PM
I don't know about those older boats, but Hurth has gone to recommending 15W40 motor oil in its transmissions instead of ATF, apparently because of drive-train chattering at idle and low speed. No damage, but they were getting complaints about the noise and the heavier oil quieted things down.

I'm not suggesting anyone with those older transmissions should switch, only mentioning the way Hurth dealt with chattering complaints in their later model V-drives.