This product has been discontinued.
Sierra
Sierra 18-3320 Water Pump Kit
Price: $41.95
Discontinued
Save: $23.74
(36% Off $65.69)
Part # 18-3320
(Discontinued)
Kit Contains:
  • (1) 18-3109 Water Tube - replaces O.E.# 23-29804
  • (1) 18-3017 Impeller - replaces O.E.# 47-89984
  • (1) 18-3116 Housing - replaces O.E.# 46-96148A1
  • (1) 18-3420 Water Pump Base - replaces O.E.# 46-44292A3
  • (1) 18-2919 Water Pump Base to Gear Housing Gasket - replaces O.E.# 27-42631-1
  • (1)18-3110 Grommet - replaces O.E.# 26-38970
  • (2) 18-2945 Gear Housing Drain Screw Gasket - replaces O.E.# 12-19183
  • (1) 18-2826 Water Pump Base to Gear Housing Gasket - replaces O.E.# 27-85610-1
  • (1) 18-2914 Lower Water Pump to Wear Plate Gasket - replaces O.E.# 27-85608-1
  • (1) 18-2915 Upper Water Pump to Wear Plate Gaskte - replaces O.E.# 27-85609-1
  • (1) 18-2944 Seal Ring - replaces O.E.# 26-45577
  • (1) 18-3117 Plate - replaces O.E.# 32435
  • (1) 18-7158 O-Ring - replaces O.E.# 25-30613
  • (1) 18-7162 O-Ring - replaces O.E.# 25-33145
  • (1) 18-7173 O-Ring - replaces O.E.# 25-30224
  • (1) 18-7176 O-Ring - replaces O.E.# 25-90011
  • (1) 18-2801 Water Pump Gasket - replaces O.E.# 27-32438
  • (1) 18-7196 O-Ring - replaces O.E.# 25-38099
  • (1) 18-7426 O-Ring - replaces O.E.# 35-30271
Average Customer Review for Sierra 18-3320 Water Pump Kit
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Based On 17 Reviews | Write Review
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Good product
by Kyle from Kenly, North Carolina on July 26, 2018
The water pump was easy to install. It had all the nessasary parts needed to do the job right.
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Water pump change time.
by a Customer from Lakeland, Minnesota on April 26, 2017
This is my first order with iboats.com, I am happy to say my order arrived complete and on time. Your price is very competitive. I usually use OEM parts but I want to give Sierra a try I'm expecting they will give me good service. Thanks for helping me keep my maintenance cost down.
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Pump Kit
by Harold from Corning, New York on October 13, 2016
Contained all parts to rebuild and was delivered in a timely manner
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Nice kit
by Donald from Campbell, Ohio on June 19, 2015
Everything you need to rebuild your mercruiser water pump.
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Water Pump Kit
by Norman from Baldwinsville, New York on May 26, 2015
Great kit with all the pieces I needed at a fantastic price!
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Not bad
by Jarold from Henderson, Nevada on October 21, 2014
While it did come with all the gaskets you could possibly want, the base however was to big to fit in the MR/Alpha housing. Not sure when the size change occurred but if you order this unit be sure to save the old pump housing base to reuse or you will be screwed!
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fast shipping the item is a good quality.
by Robert from Hudson, Florida on October 19, 2014
very pleased with IBoats parts catalog.the item was very easy to install.I will be ordering from IBoats in the future. I need to do a transom seal next.
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good service and fast delivery
by Paul from Guelph, Ontario on October 16, 2014
I received the right part and iboats was fast to ship it out. It would be great if they offered UPS delivery all the way to my door rather than canada post after it left customs
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Water pump kit
by Marc from Burley, Idaho on July 04, 2014
Boat runs great now , no more over heating .
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water pump kit
by Joel from Winnabow, North Carolina on July 27, 2013
got my parts on time and works great ,no problems
(1 of 1 people found this review helpful)
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Mercruiser water pump
by Dawn from Union Gap, Washington on June 17, 2013
Thank you for having a complete kit with the base. This made it easier to have all matching parts. Love that everything works great in the boat now as Iboats had everything we needed.
(1 of 1 people found this review helpful)
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Fits Well
by Victor from Bellaire, Ohio on May 24, 2013
This is a complete kit for a pre Gen 2 Alpha outdrive. Several O-rings are included. Make sure to use the correct one on the lower pump plate. I had to use the thinner one.
(1 of 1 people found this review helpful)
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merc. 224 cid/165 hp 4 cyl.
by Siah from Morehead, Kentucky on April 25, 2013
this is an exact fit. great quality. no instructions ,so pay attention when you disassemble and double check for any debris from old impellor and clean well.
(1 of 1 people found this review helpful)
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Excellent product
by Otis from Land O' Lakes, Florida on September 25, 2011
The water pump itself is an excellent kit, there needs to be some information included regarding the "extra" parts that are not needed in all cases.
(4 of 4 people found this review helpful)
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Water pump kit
by John from Eagle River, Wisconsin on August 29, 2011
I am not a boat mechanic and the name of this item confused me. I would have called it "impeller and housing with gaskets" It installed easily and all the correct parts were included. Right price, right part.
(1 of 1 people found this review helpful)
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Great for DIY
by Timothy from Winchester, California on July 22, 2011
Kit was a bit confusing because it came with gaskets not used on my Alpha Gen. 1 stern-drive and no instructions, but everything went together perfectly and the boat is seaworthy again.
(2 of 2 people found this review helpful)
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Review for Sierra 18-3320 Pump Kit
by a Customer on September 13, 2009
(2 of 6 people found this review helpful)
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Q:
I have a 1996 mariner 135hp 0g305196 is this the correct kit?
A:
No you will need part number 18-3319.


Q:
Will this kit fit a 1980 Mercruiser 5.7 260 hp?
A:
18-3317 is the correct water pump repair kit for your engine.


Q:
I have a 4.3 L alpha 1 .I had ordered Kit?
A:
We will need to know outdrive serial number in order to confirm kit.


Q:
I have a 1999 4.3L mercruiser alpha 1 - 175 HP serial?
A:
You have the Gen II model outdrive so you will need part number 18-3147.


Q:
I have 1987 3.7 4 cylinder with the 165 outdrive. Is this the impeller / water pump I need ?
A:
This is for an Alpha One outdrive serial number 6854393 - D594568. We need your serial number to confirm if this will work for you.


Q:
Is the right one for a 1986 Mercruiser 205 MR?
A:
It is correct as long as your serial number is 6854393-D594568.


Q:
Will this fit a Mercruiser outdrive with serial #6217325?
A:
If your outdrive is the MR/ALPHA I then yes this one will work (18-3320). If it is not and is pre-Alpha 1 then you will need 18-3317.


Q:
I have a mercruiser i/o with two stickers on it. The first sticker reads: Mercruiser Drive Unit Serial # 6015232. The 2nd sticker reads: Mercury Model MCM-140 Serial # 6045105. What is the correct water pump replacement kit, please?
A:
The correct kit is 18-3317.


Q:
I have a 1984 5,7L stern drive with a SN# A375678, is this the proper part for it?
A:
No, i show the correct water pump kit for your engine is part# 18-3317.


Q:
I have an ALFA1 SN# 0B662125 is the Sierra 18-3320 the correct part for me. What does 'MR' stand for?
A:
This would be the best replacement for your Mercruiser engine. MR generally stands for Mercury or Mercruiser.


Q:
Have 1988 5L. 305 c.i. alpha 1 ,is this the correct kit ?
A:
Yes the Alpha 1 (pre Gen II) went from 1983-1990. So this kit will work for that outdrive.


Q:
I have a 1987 454ci mercruiser, w/ alpha1, Gen1outdrive, what impeller kit do i need?
A:
This is the water pump kit you need, 18-3320.


Q:
I have an 0f516249. Is this the right kit?
A:
You need 18-3570 (upper pump kit) or 18-3147.


Q:
I have serial 0f519249. Is this the right kit?
A:
You need 18-3570 (upper pump kit) or 18-3147.


Q:
Do I need the 18-3319 or 18-3320 for my Mercruiser SN: 0B429113?
A:
18-3320 is called for Mercruiser MR/Alpha outdrive. MR/Alpha ranges from 6854393-D594568.


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