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Old 15 August 2010, 17:48   #1
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merc v175 cooling system / temp sender

Hi

I have baught a rib with a merc v175 (v6) 1995.

Today i took it for a good spin and noticed the temperature guage showing hot.

I am questioning the accuracy of the guage and/sender as at first it showed cold all day, i then found a loose connection and it jumped to hot.

I have a manual but i cannot find any where a diagram of the cooling circuit.

Where is the tempertaure sensor located and is there any way of testing this?

Does this engine have a thermostat and where would it be located?

The tell tale is warm to hot - but not scalding hot.

When i stopped and idled the guage slowly dropped to cold.

Can any one offer any assistance?

Thanks
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Old 15 August 2010, 18:25   #2
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is it a Quicksilver gauge?I'm wondering if it could be a gauge fault too. It might be worth pointing an infra-red thermometer at the engine with it run up to temperature.

The temp sender is bolted to one head.It's a component on a single wire.
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Old 15 August 2010, 18:51   #3
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Hi

I am not sure if it is a quick silver guage - although it looks like it may be original.

Should it be a quicksilver guage?

I have an infra red sensor

where would i measure the temperature from?

What temperature should i expect?
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Old 15 August 2010, 19:37   #4
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Boat name: WhiteNoise/Dominator
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Quote:
Originally Posted by tracidfish View Post
Hi

I am not sure if it is a quick silver guage - although it looks like it may be original.

Should it be a quicksilver guage?

I have an infra red sensor

where would i measure the temperature from?

What temperature should i expect?
I asked if it's a Quicksilver as they were the original units and unlikely to be miles out on the calibration whereas if it's an aftermarket unit it may be the wrong one for the engine and need 'adjusting'.

I'd measure the temp of the water jacket around the spark plugs. Check it on all the cylinders as a radical variation will probably mean the water jacket is partially blocked.

Exactly what temp to expect I don't know as it depends what temp the thermostat opens,but it'll be pretty obvious if it's overheating.
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