Yanmar 3YM30 raw water pump failure

C

Capt’nKarl

Well-known member
Joined
Feb 22, 2013
Messages
624
Fluid Motion Model
C-242 C
Hull Identification Number
FMLT2330I718
Non-Fluid Motion Model
Previous R-21EC
Vessel Name
DRAGONFLY
I recently purchased a 2009 21EC with 230 hrs on the engine. The previous owner told me the raw water pump failed after only a few hrs of use. Unfortunately this failure caused salt water to spray over the front of the engine and now I have a slight rusting issue. Looking at the pump and belt drive now I noticed the belt was VERY loose which was a concern. However, I have seen from other boat sites that many people had failure of the raw water pump and felt the cause was an OVERTIGHTEN belt causing strain on the bearings in the pump. I was about to tighten the belt to factory specs but wanted to hear if anyone has had this issue and or comments about belt tension.

thanks

Karl
 
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