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Old 04-10-2006, 10:20 PM
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Default Hewes 18 Redfisher

I just bought this boat, and it overheats. The water pickups are below the water line when the TACH is above 4000 RPM's. When I run at 3200 there is enough water to not overheat, but I am unable to trim the motor up, as it begins to cavitate. If I put a low water pickup on the motor, that should solve the overheating problem, but I still wont be able to trim the motor. It has a 115HP Yamaha with a 20" shaft. I called Hewes, and they said that is the right motor. I was just wondering if I am the only one having these problems??
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Old 04-10-2006, 10:52 PM
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Default Re: Hewes 18 Redfisher

is the motor on a jackplate

is this a new boat or new to you

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Old 04-10-2006, 10:55 PM
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Default Re: Hewes 18 Redfisher

The boat is a 1994 and I just bought it. The motor is mounted on the transom, and it is in the lowest possible position.
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Old 04-10-2006, 11:26 PM
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Default Re: Hewes 18 Redfisher

Anyone else have any ideas?
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Old 04-11-2006, 05:23 AM
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Default Re: Hewes 18 Redfisher

You may want to consider putting a longer lower unit on: i.e. 25'' SWS series. Do you have trim tabs or not? You have a good boat with a situation that I have not heard of yet!!!!
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Old 04-11-2006, 01:01 PM
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atl
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Default Re: Hewes 18 Redfisher

You have the right length shaft (20"). Have you checked your impeller? Do you think that your coolant passages could somehow be clogged? Thermostat?

FYI, I have heard mixed reviews about those low-water pick-ups that you mentioned... I have heard that they tend to collect debris and clog easily. I think these things are meant more for the super skinny jackplate/tunnel-hull users.
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Old 04-11-2006, 01:25 PM
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Default RE: Hewes 18 Redfisher

Alright, lets use some common sense for once. This should solve your problem. Try in this order.

1) Replace thermostats.
2) Replace impeller.
3) Add water pressure guage.

4) Go catch fish.
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Old 04-11-2006, 01:47 PM
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Default Re: Hewes 18 Redfisher

Bad,

I had a two stroke 115 yammi (99) and when the impeller went, I got an overheat alarm when over 4KRPM, and it was fine under that. The reason was that the impeller had spun on the shaft, had enough grip to hold on and pump at lower RPM, but not enough at higher rpm.

You probably need a new waterpump, like red said.

good luck.
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Old 04-11-2006, 02:04 PM
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Default Re: Hewes 18 Redfisher

Quote:
Hub - 4/11/2006 5:23 AM

You may want to consider putting a longer lower unit on: i.e. 25'' SWS series. Do you have trim tabs or not? You have a good boat with a situation that I have not heard of yet!!!!
Bad idea. The boat takes a 20" shaft and only a 20" shaft.
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Old 04-11-2006, 02:06 PM
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Default RE: Hewes 18 Redfisher

Quote:
redseacraft - 4/11/2006 1:25 PM

Alright, lets use some common sense for once. This should solve your problem. Try in this order.

1) Replace thermostats.
2) Replace impeller.
3) Add water pressure guage.

4) Go catch fish.
I agree except he should not need a water pressure gauge unless he has a jackplate.
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Old 04-11-2006, 02:06 PM
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Default Re: Hewes 18 Redfisher

A 30" gear case would be best
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Old 04-11-2006, 02:08 PM
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Default Re: Hewes 18 Redfisher

Quote:
grnbabil - 4/11/2006 2:06 PM

A 30" gear case would be best
I am sure you are joking right.
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Old 04-02-2010, 09:23 AM
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Default Thank you everyone

Sorry for the long delay, but I got the problem fixed. I took the advice of a knowledgeable responder and I replaced the motor with a 30" shaft.

OKAY JUST KIDDING.

The real problem with the overheating was the water flow. The pressure was always good, but the quantity of the flow was too low. As it turns out, the water jacket, ports, and other areas of the motor where water flows had crystalized salt build-up.

I bought two new thermostats and gaskets, head gasket, water jacket gasket, and water pump impellor. When I pulled the heads off, they were clogged and I used several different pics, screwdrivers, and ramdom tools to scrap out all the crud out of the water ports.

Funny, but the motor still pisses out the same amount of water, but no overheat alarm. She runs to 5750 RPM at 39 MPH all day if needed.

Thanks everyone for your input and good fishin.
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Old 04-02-2010, 10:59 AM
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Wow, 4 year update.
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Old 04-02-2010, 11:28 AM
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Default

Quote:
Originally Posted by grnbabil View Post
A 30" gear case would be best
Seriously? Are you retarded

You need a new impeller on the water pump and as a precaution I would install a water pressure guage, ALWAYS nice to have and can come in real handy!! And they are cheap too....
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