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 Honda 8 maintenance		  New Topic  Topic Locked
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RoofRoof
Navigator

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USA
186 Posts
Initially Posted - 07/15/2005 :  08:18:00  Show Profile
My 2001 Honda 8hp 4 stroke XL shaft is about 4years old now.(bought it new, although a couple yrs older model) I think it might be time to change out the impeller. Is this possible while mounted on the boat? Anyone know the procedure? Or, any reason to think it is time?
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bear
Admiral

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USA
909 Posts
Response Posted - 07/15/2005 :  09:20:13  Show Profile
My 1995 Honda 8, 4 stroke still is pumping with the original impeller. I think if you run the motor in clean water it adds to the life of that unit.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 07/15/2005 :  09:34:19  Show Profile
Nothing I'd ever attempt in the water.

Last one I changed out was after 15+ years of service... which might have been stretching it a wee bit. But your mileage may vary... reckon it depends a bit on how many hours your put on your engine. Typically, I might put 5 hours a year on mine.

I know that impeller life is radically shortened if you run it dry, either from ventilation or a clog on the water intake ports.
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 07/15/2005 :  10:32:24  Show Profile
You have to pull off the lower end of the motor to change the impeller. Unless your boat is out of the water you would have to pull the engine. I recommend you buy the Honda manual for your engine before you begin. I believe it cost about $35.00 but Honda parts are not cheap and that may be the best $35 you spend. Why do you think the impeller may need changing?
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 07/15/2005 :  10:57:51  Show Profile  Visit JimB517's Homepage
pulling the lower end means you are also going to be dumping the lower end oil, you don't want that in the water!

I'd suggest take the motor home, make a little mount in the garage.

Impeller
lower unit oil change
new timing belt
new plugs
upper unit oil change

remember to use anit-seize on all bolts when reassembling
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lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts
Response Posted - 07/15/2005 :  11:17:59  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by JimB517</i>
<br />pulling the lower end means you are also going to be dumping the lower end oil, you don't want that in the water!
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

You DON'T have to drain the lower unit gear oil just to change the impeller. The lower unit unbolts from the shaft housing in one piece (you do have to un-pin the gear shift rod up in the powerhead). Unbolting the lower unit to change the water pump impeller does not require you to drain any oil from either the engine or the gear case. If your boat is in the water, it could be done sitting in a dinghy if the water is calm. However, I would remove the motor from the boat and do the job on land if possible, with the motor on a workstand. Trying to do even a simple job like replacing a prop and shear pin is a lot easier on shore than trying to do it sitting in a dinghy (been there done that), and there's less chance you will lose some small but critical part like the snap ring that attaches the gear shift rod to the shift lever. Be very careful removing the 4 lower unit bolts, especially if you keep the boat in a salt water marina. The bolt threads in the aluminum may be clogged with salt and you will strip them if you apply too much wrench force. If you can't break them loose with 15 foot pounds of torque, try soaking the threads with Liquid Wrench overnight. Whatever you do, don't use heavy force; if you strip the threads, you'll regret it.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.