Knocking when idling in gear

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   I was riding in the back while my wife was driving. I noticed that when she had the boat in gear but was just idling there was a mild tap-tap-tap sound. It was either coming from the floor behind the engine compartment or inside the back of the engine compartment; probably both. However, when she gave the engine some gas to pull a skier, the knocking either stopped or was drowned out by the engine. We had too many people and too much equipment in the boat for me to do a thorough search on the water.

Is this noise normal? dangerous? simple to fix? 

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merrittarnold Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-06-2009 Location: United States Status: Offline Points: 83	Post Options Post Reply Quote merrittarnold Report Post Thanks(0) Quote Reply Topic: Knocking when idling in gear Posted: July-28-2009 at 9:00pm
	I was riding in the back while my wife was driving. I noticed that when she had the boat in gear but was just idling there was a mild tap-tap-tap sound. It was either coming from the floor behind the engine compartment or inside the back of the engine compartment; probably both. However, when she gave the engine some gas to pull a skier, the knocking either stopped or was drowned out by the engine. We had too many people and too much equipment in the boat for me to do a thorough search on the water. Is this noise normal? dangerous? simple to fix?
	There are motorcycles; and there are Harley Davidsons. There are tractors; and there are John Deeres. There are ski boats; and there are Ski Nautiques!

Luchog Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135	Post Options Post Reply Quote Luchog Report Post Thanks(0) Quote Reply Posted: July-28-2009 at 9:10pm
	from your description it could be many things, you need to do a little more investigation.
	1980 Ski Nautique Commander 351W

anthonylizardi Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: July-25-2007 Location: DFW, TX, USA Status: Offline Points: 836	Post Options Post Reply Quote anthonylizardi Report Post Thanks(0) Quote Reply Posted: July-28-2009 at 9:50pm
	Read about damper plates. Is a common thing specially if your boat alignment is off. Tons of stuff on that and alignment

86BFN Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: July-28-2008 Location: Indiana Status: Offline Points: 882	Post Options Post Reply Quote 86BFN Report Post Thanks(0) Quote Reply Posted: July-28-2009 at 10:13pm
	Most important of all, blame it on wife! LOL Sorry I'm no help.
	👣 Steve 86 Barefoot Nautique 89 Martinique Former Owner: 93 Hydrodyne 350 MAG

Luchog Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135	Post Options Post Reply Quote Luchog Report Post Thanks(0) Quote Reply Posted: July-28-2009 at 10:48pm
	what's your rpms at iddle speed? sometimes if they're too low bumping them up will solve the clanking sound.
	1980 Ski Nautique Commander 351W

merrittarnold Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-06-2009 Location: United States Status: Offline Points: 83	Post Options Post Reply Quote merrittarnold Report Post Thanks(0) Quote Reply Posted: July-30-2009 at 1:27am
	I know it idles at 800 when not in gear. I'm not sure what rpm when in gear. We will probably go Saturday if the weather allows. I will do more investigation, but what exactly should I look for?
	There are motorcycles; and there are Harley Davidsons. There are tractors; and there are John Deeres. There are ski boats; and there are Ski Nautiques!

Luchog Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135	Post Options Post Reply Quote Luchog Report Post Thanks(0) Quote Reply Posted: July-30-2009 at 4:37am
	you want to see how much they lower when you put the boat in gear, feel if it makes the noise and then give it a little gas until it stops clanking.
	1980 Ski Nautique Commander 351W

Knocking when idling in gear

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