Yanmar Excessive Vibration

AaronJ · 02-11-2009, 12:26

Hi, my Yanmar 2GM20F seems to vibrate way too much on its flexible mounts. They could possible be 20 years old if previous owners never replaced them. That's probably why I need to replace the dripless stuffing box. I just wanted to make sure that replacing the flexible mounts will help the vibration issue. Especially because they cost $130 each.

Thanks,
Aaron

Sailmonkey · 02-11-2009, 12:36

The mounts can wear out, but does your engine jump and shimmy while in gear and pushing the boat? It's relativly normal for these engines to look like they want out when they're at low idle and not in gear.

Solitude · 02-11-2009, 12:57

I did read that the Yanmar mounts are quite flexible.

My 1GM10 shakes alot in idle but settles down at cruising RPM. The mounts are 8 years old. Check in gear.

svHyLyte · 02-11-2009, 13:53

We had a 2GM20F in our prior yacht, a 1976 Cal 2-29, swinging a 2-blade fixed prop and the engine was always very smooth running. The only time we had any vibration, it proved to be a mis-alignment problem as a result of a mount lock-nut that had loosened somewhat.

FWIW...

02-11-2009, 12:26	#1
AaronJ Registered User Join Date: May 2009 Location: Indialantic, FL Boat: Hunter 30 - "Nolina" Posts: 23	Yanmar Excessive Vibration Hi, my Yanmar 2GM20F seems to vibrate way too much on its flexible mounts. They could possible be 20 years old if previous owners never replaced them. That's probably why I need to replace the dripless stuffing box. I just wanted to make sure that replacing the flexible mounts will help the vibration issue. Especially because they cost $130 each. Thanks, Aaron

02-11-2009, 12:57	#3
Solitude Registered User Join Date: Nov 2008 Location: West Coast, BC , Canada Boat: Cascade Posts: 374	I did read that the Yanmar mounts are quite flexible. My 1GM10 shakes alot in idle but settles down at cruising RPM. The mounts are 8 years old. Check in gear. __________________ Go outside and PLAY!

02-11-2009, 13:53	#4
svHyLyte Registered User Join Date: Mar 2006 Location: Tampa Bay area, USA Boat: Beneteau First 42 Posts: 996	Check you alignment... We had a 2GM20F in our prior yacht, a 1976 Cal 2-29, swinging a 2-blade fixed prop and the engine was always very smooth running. The only time we had any vibration, it proved to be a mis-alignment problem as a result of a mount lock-nut that had loosened somewhat. FWIW... __________________ "It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."

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02-11-2009, 12:36	#2
Sailmonkey Registered User Join Date: Sep 2009 Location: Houston, TX Boat: '76 Allied Seawind II Posts: 72	The mounts can wear out, but does your engine jump and shimmy while in gear and pushing the boat? It's relativly normal for these engines to look like they want out when they're at low idle and not in gear.