Putting in gear

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joeh

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Hello Forum,
I have an old Volvo engine MD6A onboard. Max rev is rated 2400 rpm. If I put it in gear while it is reving at 1800 rpm, is anything likely to go wrong ? Thank you.
 
Yes, the Gearbox. It may tolerate it for a few times but not for long. Set the idle RPM at the rate the manufacturer recommends.
 
It's a bit like dropping the clutch in first gear with a car revving like that.

Engine has lots of speed, power & torque; prop is stationary, has lots of inertia and the deadweight load of water on the blades. Irresistable force meets immovable object - something has to give.

Gearbox, joints, bearings, shaft, all will take a pounding.
 
[ QUOTE ]
Hello Forum,
I have an old Volvo engine MD6A onboard. Max rev is rated 2400 rpm. If I put it in gear while it is reving at 1800 rpm, is anything likely to go wrong ? Thank you.

[/ QUOTE ]

Boats don't do wheelies !! Things break !
 
[ QUOTE ]
Hello Forum,
I have an old Volvo engine MD6A onboard. Max rev is rated 2400 rpm. If I put it in gear while it is reving at 1800 rpm, is anything likely to go wrong ? Thank you.

[/ QUOTE ]

Why on earth would you want to unless there is something wrong with the throttle control such that the engine cannot run any slower?
If that is the case I would suggest that boat is unsafe until sorted.
 
There should not be any damage to the engine components as such, when you engage gear at 1800 revs. The only effect will be to reduce revs. The danger as previously stated will be to damage the components in the power train. I would advise you to reset the tick over to its correct speed as shown in your manual. If you continue with the 1800 revs, you will have to engage/disengage repeatedly to move the boat at slow manouvering speeds, this will bring the failure time forward.
 
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