Re: [Amel Yacht Owners] Yanmar Raw Water Pump Failure


Mark Erdos
 

Eric,

 

Very clever. Are you able to get them tight enough by hand or do you use the versions that have an allen wrench head?

 

Best regards,

 

Mark

 

SM2K #275

www.creampuff.us

 

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Wednesday, October 15, 2014 3:00 PM
To: amelyachtowners@...
Subject: RE: [Amel Yacht Owners] Yanmar Raw Water Pump Failure

 

 

Ian,

I purchased knurled thumb screws for this application made of stainless. It is much easier to use.

Also, do you have the new yanmar impellers that take a bolt to easily remove the impeller?

Fair Winds

Eric

Kimberlite SM 376

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Wednesday, October 15, 2014 6:23 AM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Yanmar Raw Water Pump Failure

 

 

When I went to inspect the impeller on the Yanmar raw water pump, I
found the head missing off one of the 4 bolts that holds the impeller
housing end plate in place. Fortunately I was able to extract the
remaining part of the bolt with some miniature mole grips. A friend of
mine that knows all about stress said that the bolt had suffered fatigue
and crevice corrosion. I believe this might have happened once before as
one of the bolts had been replaced with a stainless one.

I have now replaced all 4 bolts with M5 x10 stainless bolts coated in
Corrosion Block Grease, and have taped a bag with a set of spare bolts
nearby in case there is a failure at sea.

It would seem that the original Yanmar bronze bolts may be a bit on the
fragile side.

Ian Shepherd SM2K 414 (2003) Crusader- Cyprus

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