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| Yanmar 3gm30 rough vibration in forwa... |
| Author |
Message |
    
Pat Brehm
New member
Username: pocketchange
Post Number: 1
Registered: 07-2008
| | Posted on Thursday, July 03, 2008 - 11:05 am: | 
|
Our 3GM30 has recently developed a very rough "shaking" vibration when engaging forward gear in idle to moderate rpm. Applying full throttle stops the vibration, and it is absolutely smooth in reverse at any rpm. The prop (Gori 3 blade folding)and shaft are perfect. When vibrating, the engine nearly jumps out of it's mounts, and water pours out of the Volvo packing gland. The engine isolator mounts appear tight. Am very good mechanically, any ideas? |
scott stephens
Senior Member
Username: scott_s
Post Number: 1299
Registered: 05-2006
| | Posted on Thursday, July 03, 2008 - 01:37 pm: |
|
yes, I have seen this before. I will post at length this evening after work. S. |
scott stephens
Senior Member
Username: scott_s
Post Number: 1300
Registered: 05-2006
| | Posted on Thursday, July 03, 2008 - 07:59 pm: |
|
ran into this a few years back in san diego. same symptoms as you described. yanmar even sent some engineer types to check it. no one could figure it out. turned out to be the thrust washer on the intermediate shaft. it normally sits in a little pocket in the case. it had somehow become loose and turned on the shaft. was riding against the reverse gear when in forward. it's been a number of years, but as I recall I just put it back in place and it stayed there. anyway, when disassembling the gear. look very closely for this. this gear is by the way, very easy to work on. the hardest part is taking it out of the boat. I have a copy of the parts breakdown, showing the part in question. don't think I can post it here as it is from a copywrited service manual but could send it to you via e-mail if you need. |
Pat Brehm
New member
Username: pocketchange
Post Number: 2
Registered: 07-2008
| | Posted on Thursday, July 16, 2009 - 01:50 pm: |
|
Scott, I ignored this issue for the last season, but I now want to get it tackled. Do please email me the parts breakdown page. I was wondering whether it had to do with the transmission. I appreciate your reply. |
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