big thud when shifting gears volvo dp

[water dog boomer]

When I change gears on my Volvo penta dp out drive there is a big thud. Forward or reverse the other out drive is smooth no noise. I had the out drive serviced thinking that something had gone bad, not all checked out. Could it be the damper plate? Springs gone bad?

 

[bruceb58]

What model do you have? What RPM are you idling at?

 

[water dog boomer]

it is a dp-d1 iidling @ 700 rpm

 

[bruceb58]

If it was the damper plate, you would get vibration from that engine. Are you getting extra from it. Might be hard to tell unless you stuck your head back there.

 

[Scott Danforth]

could be drive is low on oil or the shift cable has stretched and the linkage is now out of adjustment

 

[QBhoy]

Like Scott and Bruce say....
I'd think you need to get the boat on the hard and have a look at the oil in the drive as a primary measure. Take it from there.
Good luck.

 

[QBhoy]

That's if you are certain the rpm is only 700. They clunk if the revs are holding higher...been through this recently with a friend's boat. Was a carb, gear and throttle cable mechanism combined fault

 

[water dog boomer]

full on oil, shift cable is good. I do have some vibration