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procraftkev Male

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Posted: June 12 2005,7:08 am

Post # 1

My oil temp runs 190 at high rpms my water temp never gets over 100 Ive tested my water temp guage and replaced the sending unit. the engine is a 540 merlin with ext oil cooler.Two trips ago my oil temp was running at 250 and water was the same I changed the inpeller in my water pump.Last trip the oil temp ran 250 and water was the same. Whats going on?

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Posted: June 13 2005,5:47 am

Post # 2

The block can act as a cooler somewhat especially if you're not getting any heat in the motor. But it sounds to me that you may have a restriction in the cooler or lines, might want to pull it apart and check it, do you have a sea strainer??. You say you changed out the impellor, was there any pieces missing??, if there were you need to find them because they will end up plugging up a passage or line!.. I would also put mechanical guages in and try it, you'll get a true reading then!..Good luck!.. :good

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procraftkev Male

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Posted: June 13 2005,4:07 pm

Post # 3

Thanks GoFast One side of the vanes were cracked but none missing. I thought maybe they werent putting enough presure and cavating. No sea strainer I have backed off the beach a few times and I think and was not a good idea would a sea strainer catch the sand. I am going to pull the cooler of and inspect it sealed but I think I can blow some water back through it to get an idea. I am going to install some mechanical guages in to see I find the water temp cant be running that cool. Thanks for the help!

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procraftkev Male

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Posted: June 13 2005,8:08 pm

Post # 4

Pulled the oil cooler off clear as a bell water flows thru great.I want to hook up a water presure guage in the system.Were would be the best place to install the sending unit?What water presure should that make Im thinking Im just not getting enough water flow.

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Posted: June 14 2005,6:13 am

Post # 5

Quote (procraftkev @ June 13 2005,8:08 pm)

Well see what the mechanical guages tell you, how about the dump, did you check that???. If you want to put a pressure guage on put it where the water exits the motor, if you get a ton of pressure then you have a restriction in the dump somwhere?, is your pickup free of debris??.. :stupid

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procraftkev Male

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Posted: June 14 2005,6:04 pm

Post # 6

Pickup is in the out drive and the water dump is out the exuast I need to check the out drive to see if is pluged up.All winter long it never got over 190 85mph for miles on end I just cant see the water temp of the lake changeing it that much.What is to high for oil temp?

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Posted: June 14 2005,6:49 pm

Post # 7

So, what is the oil temp red line???

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Posted: June 14 2005,8:11 pm

Post # 8

Quote (procraftkev @ June 14 2005,6:04 pm)

Well if it was me I'd save time and start from one end and folow it all the way thru, there has to be something plugging things up somewhere if it was running ok before, would take a very drastic change in water temp to make that much difference, do you have a T-Stat setup??, one more thing to check!... I like around 210-220 for oil temp seems to work for me!.. Some may have other opinions!.. :stupid

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Posted: June 15 2005,6:27 am

Post # 9

It's always been my understand that you want the oil temp high enough to burn off any condensation in the oil (i.e. at least in the 220* range). Otherwise the condensation will attack the internals of the engine, especially if the engine sits for any length of time between outings.

So, 250 doesn't sound that far out of whack for warm weather boating. It is on the warm side, but if you're using a good oil of the proper vicosity, you shouldn't have two much to worry about. I tried to find what the recomended max temperature for mineral oil was last night, and didn't come up with much.

I'm like you though, why did it just suddenly change??

Looking at it in a purley troubleshooting sense, I would say your indication system went goofy. Could be a bad guage, or sender. Try ohming out the wire between the two and see what you get, it should be close to 0. Watercraft wiring is infamous for two things, corrosion and bad grounds. Either one could cause strange reading on the guages.

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Posted: June 15 2005,6:34 am

Post # 10

Quote (Sleek-Jet @ June 15 2005,6:27 am)

Â Could be a bad guage, or sender. Â Try ohming out the wire between the two and see what you get, it should be close to 0. Â Watercraft wiring is infamous for two things, corrosion and bad grounds. Â Either one could cause strange reading on the guages.

That's why you use mechanical guages, I don't even trust that electrical junk in a daily driver, cooked a motor in my tow vehicle once because of a temp sending unit went fubar on me!... :angry

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Posted: June 15 2005,7:29 am

Post # 11

Quote (GoFastRacer @ June 15 2005,6:34 am)

Quote (Sleek-Jet @ June 15 2005,6:27 am)

That's why you use mechanical guages, I don't even trust that electrical junk in a daily driver, cooked a motor in my tow vehicle once because of a temp sending unit went fubar on me!... :angry

Yeah, you just have to worry about your oil pressure line springing a leak and pumping hot oil all over the interior. :beat

It depends on the application. If it's a short run and easy to keep an eye on (not behind panels or running under floors and such), I like to have mechanincal's. If the hose has to be run out of site, or on a long run (say up from the engine compartment on a larger boat), I say go electrical.

As far as the oil temp goes, I did a little research and found that all oils have to meet a certain sheer requiremant based on their viscocity at 100*C, with a maximum sheer rating at 150* C. 100*C = 212*F and 150*C = 300*C .

So at 250* on the gauge, you're about 3/4 of the way to the "redline"... probably not the best thing, but not the worst either.

I'm sure one of the engineering types around here will see this and let us all know I'm full of shit, but that is how I understand it.

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Posted: June 15 2005,8:46 am

Post # 12

Quote (Sleek-Jet @ June 15 2005,7:29 am)

Yeah, you just have to worry about your oil pressure line springing a leak and pumping hot oil all over the interior. Â :beat

How in the heck is it going to spring a leak with teflon braided line???????.. :confused

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Posted: June 15 2005,9:25 am

Post # 13

Quote (GoFastRacer @ June 15 2005,8:46 am)

Quote (Sleek-Jet @ June 15 2005,7:29 am)

Yeah, you just have to worry about your oil pressure line springing a leak and pumping hot oil all over the interior. Â :beat

How in the heck is it going to spring a leak with teflon braided line???????.. :confused

Oh gee.. I don't know. How about abrasion??

And I'm not a big fan of having combustable fluids in the passanger area.

My point is that both systems have their draw backs. If you can install mechanical guages where you can inspect all of the hoses and connections on a regular basis, go for it. But they aren't the end-all be-all that they are made out to be.

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procraftkev Male

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Posted: June 15 2005,5:17 pm

Post # 14

Thanks alot for the help guys At least Im not way out of line with the oil temp.

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Posted: June 15 2005,8:23 pm

Post # 15

Quote (procraftkev @ June 15 2005,5:17 pm)

Thanks alot for the help guys At least Im not way out of line with the oil temp.

Nope oil temp is in the ballpark, just need to trace down the cooling thing!.. :good

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Posted: June 15 2005,8:28 pm

Post # 16

Quote (Sleek-Jet @ June 15 2005,9:25 am)

Quote (GoFastRacer @ June 15 2005,8:46 am)

Quote (Sleek-Jet @ June 15 2005,7:29 am)

Yeah, you just have to worry about your oil pressure line springing a leak and pumping hot oil all over the interior. Â :beat

How in the heck is it going to spring a leak with teflon braided line???????.. :confused

Oh gee.. I don't know. Â How about abrasion?? Â

And I'm not a big fan of having combustable fluids in the passanger area. Â

My point is that both systems have their draw backs. Â If you can install mechanical guages where you can inspect all of the hoses and connections on a regular basis, go for it. Â But they aren't the end-all be-all that they are made out to be.

Quote

How about abrasion??

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