"Dear All,
For your benefit
"Dear All,
For your benefit, I’m pleased to call your attention for the following:
Suzuki outboard motors DF 90 and DF 115, year 2006, with engine no. starting respectively in 680686 and 681518 are equipped with a Resin Water Pump Case, instead of a Stainless Steel Water Pump Case.
(According to SUZUKI publicity, when I bought my DF 90 I thought that it had a Stainless Steel Water Pump!)
In order to prevent the onset of the Resin Water Pump Case fusing by the friction of the Impeller against the resin surface in case of lack of cooling water, SUZUKI inserted a Metallic Sleeve between the Impeller and the Resin Water Pump Case.
Furthermore, in between the external surface of the Metallic Sleeve and the inner surface of the Resin Case they provided for an air interface, to reduce heat transmission from the Metallic Sleeve to the Resin Case.
In order to prevent the infiltration of water into the air interface between the resin Water Pump Case, SUZUKI invented a system of sealing: one Annular Sealing No. 1 at the top of the Metallic Sleeve, and one Annular Sealing No. 2 at the bottom of the Metallic Sleeve.
A pump case made of stainless steel or other metal suffers only from two drawbacks: is heavier than that made of resin and is more expensive to produce.
The resin pump case is lighter than that made of stainless steel or other metal and the cost is low because the materials are inexpensive and the processing cost is low.
Of course these are the reasons from the manufacturer point of view to change from stainless steel case to the resin case.
From my point of view, as a user I would prefer to pay more to have an engine with a stainless steel water pump case, and have as unique concern to replace the impeller when necessary, rather than to have other sources of potential problems: the resin case, the metallic sleeve, the annular sealings …
Now is up to you to make your own evaluation! Don’t hesitate to contact me if you wish.
Kind regards"
For your benefit
"Dear All,
For your benefit, I’m pleased to call your attention for the following:
Suzuki outboard motors DF 90 and DF 115, year 2006, with engine no. starting respectively in 680686 and 681518 are equipped with a Resin Water Pump Case, instead of a Stainless Steel Water Pump Case.
(According to SUZUKI publicity, when I bought my DF 90 I thought that it had a Stainless Steel Water Pump!)
In order to prevent the onset of the Resin Water Pump Case fusing by the friction of the Impeller against the resin surface in case of lack of cooling water, SUZUKI inserted a Metallic Sleeve between the Impeller and the Resin Water Pump Case.
Furthermore, in between the external surface of the Metallic Sleeve and the inner surface of the Resin Case they provided for an air interface, to reduce heat transmission from the Metallic Sleeve to the Resin Case.
In order to prevent the infiltration of water into the air interface between the resin Water Pump Case, SUZUKI invented a system of sealing: one Annular Sealing No. 1 at the top of the Metallic Sleeve, and one Annular Sealing No. 2 at the bottom of the Metallic Sleeve.
A pump case made of stainless steel or other metal suffers only from two drawbacks: is heavier than that made of resin and is more expensive to produce.
The resin pump case is lighter than that made of stainless steel or other metal and the cost is low because the materials are inexpensive and the processing cost is low.
Of course these are the reasons from the manufacturer point of view to change from stainless steel case to the resin case.
From my point of view, as a user I would prefer to pay more to have an engine with a stainless steel water pump case, and have as unique concern to replace the impeller when necessary, rather than to have other sources of potential problems: the resin case, the metallic sleeve, the annular sealings …
Now is up to you to make your own evaluation! Don’t hesitate to contact me if you wish.
Kind regards"