Advice on replacing sending units on a 1988 Sea Ray 300 Weekender?

I’m willing to help as soon as I know the question.
 
Since the info is so vague, hopefully this is what you are looking for.
 

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dwna1a said:
I’m willing to help as soon as I know the question.
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I bought the 1988 Sea Ray 300 Weekender a few weeks ago, and the previous owners had bought the sending units, but never had them installed. My question is where the access to the sending units is, I have found a small side hole with a cover on each side by the front seats, just wondering if there is another way to access the units. This is a small space to get into to replace these units. It might be the only way to access them.
 
Gary Kelly said:
I bought the 1988 Sea Ray 300 Weekender a few weeks ago, and the previous owners had bought the sending units, but never had them installed. My question is where the access to the sending units is, I have found a small side hole with a cover on each side by the front seats, just wondering if there is another way to access the units. This is a small space to get into to replace these units. It might be the only way to access them.
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This was as close as I could find, hope it helps.
https://s3.amazonaws.com/srweb-pvt-...ic/parts-manuals/1989__1989-300-WEEKENDER.pdf
Welcome to CSR.
 
Gary Kelly said:
I bought the 1988 Sea Ray 300 Weekender a few weeks ago, and the previous owners had bought the sending units, but never had them installed. My question is where the access to the sending units is, I have found a small side hole with a cover on each side by the front seats, just wondering if there is another way to access the units. This is a small space to get into to replace these units. It might be the only way to access them.
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The more specific you can be the better answers you will. Start with Sending units for what?
 
All you say is sending unit. Do you know which one? The water temp is located on top of the engine by the thermostat in the front. The oil is in a tough spot, under the exhaust manifold towards the rear of the engine. The transmission over temp is right on top of the trans. in the middle. Just look for wires and trace the wires to what the sending unit. The temp ones are like brass plugs and the oil is a small can. post a pic and explain a little more to get better help. Welcome to CSR.
 
SKybolt said:
All you say is sending unit. Do you know which one? The water temp is located on top of the engine by the thermostat in the front. The oil is in a tough spot, under the exhaust manifold towards the rear of the engine. The transmission over temp is right on top of the trans. in the middle. Just look for wires and trace the wires to what the sending unit. The temp ones are like brass plugs and the oil is a small can. post a pic and explain a little more to get better help. Welcome to CSR.
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This. They are engine mounted.

But let's back up another step... why are you replacing them if the gauges work? Does your alarm system also work? Although technically those are sensors, not senders.
 
Lazy Daze said:
... Although technically those are sensors, not senders.
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Don't mean to nit pick, but if your going to correct me then let's get it right. They are actually "sending unit" as they are referenced on most sites, but Stewart Warner is the sending unit on that year SR unless gauges swapped over to something else. https://www.stewartwarner.com/products/senders-sensors-switches/

Temperature and oil pressure are refenced as sending units, tachometer are referenced as sensors if they are electrical. Otherwise electro-mechanical are also sending units.

Didn't we have this conversation in another thread? Anyway not trying to argue, so please take it as such. :)
 
SKybolt said:
Don't mean to nit pick, but if your going to correct me then let's get it right. They are actually "sending unit" as they are referenced on most sites, but Stewart Warner is the sending unit on that year SR unless gauges swapped over to something else. https://www.stewartwarner.com/products/senders-sensors-switches/

Temperature and oil pressure are refenced as sending units, tachometer are referenced as sensors if they are electrical. Otherwise electro-mechanical are also sending units.

Didn't we have this conversation in another thread? Anyway not trying to argue, so please take it as such. :)
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It wasn't directed towards you. What I meant was I agree with everything you said.

I was adding that information (sensor vs sender) for the OP's benefit in distinguishing between a "sender" that sends information to a gauge and a "sensor" that trips the alarm. They CAN often be used interchangeably but this is how Mercruiser usually refers to them... so since we're talking about Merc's... ;)

No, I didn't take any offense :)
 
Lazy Daze said:
It wasn't directed towards you. What I meant was I agree with everything you said.

I was adding that information (sensor vs sender) for the OP's benefit in distinguishing between a "sender" that sends information to a gauge and a "sensor" that trips the alarm. They CAN often be used interchangeably but this is how Mercruiser usually refers to them... so since we're talking about Merc's... ;)

No, I didn't take any offense :)
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I guess to your point, it depends on what year you are discussing. The old analog world was sending units. In the Can bus world everything is a sensor. BTW, went to Merc school back in the 80's.
 
SKybolt said:
I guess to your point, it depends on what year you are discussing. The old analog world was sending units. In the Can bus world everything is a sensor. BTW, went to Merc school back in the 80's.
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You guys are posting more than the OP. :)
 
If we go by using the term sending units and the access holes. It must be fuel sending units. Yes that is your only way in. It’s a tough job to do but can be done by the owner. If the gauges are working it may just be the reading is incorrect due to the age of the cork
 
dwna1a said:
If we go by using the term sending units and the access holes. It must be fuel sending units. Yes that is your only way in. It’s a tough job to do but can be done by the owner. If the gauges are working it may just be the reading is incorrect due to the age of the cork
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Ha! I didn't even think of FUEL sending units!
 
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