Oil Temp Sender Positioning
 

On a Gen V 502 where is the best place to mount a oil temp sender.Obviously the sump plug could be adapted and i do have a plug in the side of the sump.I think this could be above the oil level though.Does anybody know what this plug is for?It is about 3.5 inches below the pan rail half way along.Any help appreciated.Thanks

Re: Oil Temp Sender Positioning
 

in the remote oil filter adapter, if you have one. or in the block , on the left side, just in front of the oil filter casting in the block above the pan surface.

Re: Oil Temp Sender Positioning
 

I have mine in the oil filter brackets.

Re: Oil Temp Sender Positioning
 

Mine is in the remote filter housing too.

Re: Oil Temp Sender Positioning
 

The best place is the stock location on the block, above the oil filter pad. The remote oil filter housing will work also.

Re: Oil Temp Sender Positioning
 

The oil pan is the best spot.

Re: Oil Temp Sender Positioning
 

it will be hottest in the pan however I like to place it after the cooler so you know what temp the engine is seeing so the filter bracket or the stock location above the filter pad on the port side of engine .

Re: Oil Temp Sender Positioning
 

The engine sees what is in the pan.

Re: Oil Temp Sender Positioning
 

What difference does it make to moniter the temp after it has gone through the cooler?... Why bother to moniter it at all if it has been cooled? The whole point of having instruments on the engine is to moniter what the engine is doing. If there is a problem with the motor... you will see it first when the oil temp suddenly elevates... I want to see what the engine is doing... not what the cooler is doing. If the engine is running lean and about to burn a piston top, you will see a big increase in the oil tempurature. Do you think you will see the increase in tempurature after the oil has been cooled? The stock mounting position is ok if you aren't running a cooler. I'd suggest measuring anything about the oiling system at it's EXTREMES . That means measuring the oil pressure at it's weakest, and the tempurature at it's highest point.

Re: Oil Temp Sender Positioning
 

The jacka$$ that built my motors the first time plumbed the oil tempurature at it's coldest point (just after the cooler)... and measured the oil pressure at it's highest point.( in the filter pad right after the pump). The moron had plumbed the oil filter backwards. I had great pressure, unfortunately all the oil was going back into the pan through the pump bypass. The oil tempurature gauge showed ice cold... Here is a picture of the end result. Mind you, the gauges gave no warning of this because of where they were plumbed. You draw your own conclusion.

Re: Oil Temp Sender Positioning
 

And the end result: you hurt your Carillos feelings!

Re: Oil Temp Sender Positioning
 

Yeah... and my wallet too!....... :D The best part is I discovered that the (as he describes himself) undisputed authority on offshore boats is a complete fraud........ :eek:

Re: Oil Temp Sender Positioning
 

There are alot of those in this industry.You wonder how they made it so far. It is the "Travel agent that has never been anywhere" syndrome. :( :( :(

Re: Oil Temp Sender Positioning
 

I'm with Reed, in the pan.
My Gen V Merc Mag 454 has a NPT bung on the port side of the oil pan.

Re: Oil Temp Sender Positioning
 

Absolutely!... measure that oil temp in the pan... and measure the pressure where it is the weakest... On generation 4 Blocks... that is on the front of the engine on the right side just above the water inlet. If you know you have decent pressure where it is the weakest... then you know it is better everywhere else. :D

Re: Oil Temp Sender Positioning
 

Rick do you have a oil temp sender in that spot on the port side of the pan.I thought it might be a little to high there?

Re: Oil Temp Sender Positioning
 

In the boss right above the block oil filter location. The pan will be higher temps then this location. This is the temp as the oil enters the motor.

Re: Oil Temp Sender Positioning
 

fastlane40
Yes I have the sender installed on the port side bung on the oil pan. I assume that is where the oil is the hottest (except for around the valve springs and piston bottoms).

I do have an oil temp issue with my new HP500 clone, so I am running Mobile 1 untill I can install a larger oil cooler this winter. Temp rises quickly at WOT, but seems to level off around 280 :(

Re: Oil Temp Sender Positioning
 

280 isn't too bad... once you crest 300 your oil will break down. The best is around 200 to 220... The oil should get up close to or slightly over the boiling point of water... that way moisture will boil off of the oil and it won't get contaminated as quickly. Whatever you do... DO NOT over cool the oil... oil lubricates best when it is around 200 degrees.

Re: Oil Temp Sender Positioning
 

Where then should I install the oil pressure unit on a GEN 6 block? Same as the GEN 4?

Keeping the questions along the same line, should I pull and plug the oil bypass (both cooler and filter in the filter pad) or install the higher lb pressure bypass units? Am I to believe that the Merlin block has no bypass units in their block? Oil continuously flows thru the filter and cooler.

Re: Oil Temp Sender Positioning
 

I run mine in the remote filter housing. After all that's were it goes first from the pan before it goes in the engine. Here are a couple pics.

Re: Oil Temp Sender Positioning
 

Guys,

Where is the temp sender on the new 525 ?????
My oil temp always seemed low.......

Re: Oil Temp Sender Positioning
 

Not sure if this has been beat to death, and I'm no expert, but I can't figure out why there are so many opinions on this. If everyone agrees the problem with oil getting too hot is the breakdown of the oil itself, then who cares what the temp is as it "enters the engine", "after the coolers", "before the filters", "before the coolers", etc. Common sense says we need to know the MAX temp the oil reaches, at any time, at any place in the motor. Isn't that what we want to monitor?? Since we can't measure the temp on "backs of the pistons" , then shouldn't we measure it after it falls off?? Like in the pan?......Isn't any point in the block going to be cooler than the pan because the block is water cooled, and therefore useless as a point of measure??

So, if the pan oil temp is at least 200 then we're hot enouph and burning off moisture, and if it's below 280-300 than our oil is not going to break down in a hurry. But if we measure any where else and get a reading of 270 and think we are safe, what if the temp is 300 in the pan?? The oil is breaking down and soon we go -- Bonk, bonk, bonk, bonk, bonk, bonk, bonk, bonk.........................

Someone explain what I am missing.................

Re: Oil Temp Sender Positioning
 

Do what I did. Install 2 senders installed both right out of the pump, and right before going back into the motor. With a toggle switch mounted under the dash, I could flip between the cooled and non-cooled oil senders to see how much temp the cooler was taking out using a common dash guage.

Re: Oil Temp Sender Positioning
 

All good points Hang Time, But the recommended temps specified before going thru the engine are just that. Max temps before going Thru the engine. In other words, for your engine oil to be able to protect your engine, it should be bellow that certain temp in the oil pan. The pump pickup is at the bottom of the pan, so taking the temp, ( though theres probably not much of a difference) should be taken at the bottom of the pan. But the next best place to take the temp is right after the pump, which is just before it goes thru the oil filter. Taking the temp After the oil cooler doesn't fall under the same temp scale as would be after it goes thru the engine. (pan temp) . I look at it this way, The so called expert say your engine is not protected if the oil temps get over ### temp. in the Pan. So if you stay under that you should be OK. The funny thing is that those temp scales were established way before synthetic oil ever was invented. Now the big debate is how much temp can be added to the old scale if your running synthetic oil??? :eek: :eek: .