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Author Topic:   15' Rage Jet boat

whaler_novice posted 07-15-2002 09:41 AM ET (US)
I recently purchased a 1996 15' Rage jet boat. Its a great first boat, and my family and I are having a lot of fun with it. Recently, however, I experiaenced an overheating problem while trolling around in a local lake. I did have four adults and 1 child in the boat. When I pulled it out of the water, I checked it thoroughly for any clogs, or obstructions to the impeller, and found none. Could the overheating be cased simply by operating the boat at slow speeds with a fairly heavy load? Is there something else I should check?
where2 posted 07-15-2002 12:13 PM ET (US)
Please include engine info with postings. Was it the 175Hp Merc power unit? Which ever power unit it has, I would consider checking the thermostat, and cooling water pump. Replace both if the boat did not come with an maintenance details.
Time to find an engine book that covers the engine/jet pump combo on your boat. Should be some troubleshooting in that... I like to have the books even if I take my work somewhere to be done. With the book, I can usually sort out the theives from the mechanics when they want to sell me parts I didn't really need.
whaler_novice posted 07-15-2002 01:03 PM ET (US)
It's an OMC 115. I have the book. There is no reference to a water pump of any kind. From the diagrams, it appears that the impeller itself acts as a water pump(????). Anyway, there's not much diagnostic info in the book. I've heard that this engine is prone to overheating. I'm wondering if the load and the extended slow speed is what caused the overheat.
rb posted 07-15-2002 08:25 PM ET (US)
Some Rages had a water filter inside the engine box, right behind the seat. I'd check it for sand or weeds.
tuna1 posted 07-15-2002 09:18 PM ET (US)
As the person on the board that is the most positive and outspoken about the Rage Jet series,and most opened minded. There are problems with the boats and power systems that Whaler never got to nail down and correct. If in fact you have a OMC Turbo Jet there can be a overheating problem,but it can be solved.Yes there is no stand alone water pump for the engine,it get it's water supply from the jet pump. The OMC should have a large see thur raw water filter/screen mounted on the transum high in back of the powewrhead.If not,the location on the powerhead mounted low to the water line rather than high above the water as in a normal outboard has lead to a clogging problem with the cooling system due to sedimemt in the system base/thermostats. I can walk you thur the problem and the fix, post back here and lets cure your problems!!( I HAVE 3 IN THE YARD,a jet can do what no other drive system can do,but it has it own pros and cons and operation limits )
where2 posted 07-16-2002 12:29 PM ET (US)
Glad to see someone can get the novice back out enjoying the water! Good luck. Thanks Tuna1
whaler_novice posted 07-23-2002 11:28 AM ET (US)
Can't find a water filter. Probably because the manual lists the filter as an optional accessory. Figuring out the cooling system is not an easy task for someone 'mechanicaly challenged' like me. I may have to bite the bullet and pay to have someone look at it.
sammysbeachfront posted 03-24-2010 03:24 PM ET (US)
Hi guys! I recently boat a rage jet boat from a buddy of mine that could never get the overheating alarm to go off. After I purchased the boat I removed the engine and uninstalled the thermostats and poppet valves, flushed the engine and filled it with salt-a-way. I let the engine set for a week before reinstalling. I just took her out on her first run and after about an hour the alarm starts chirping before slowly becoming steady. My question is...Can you test the temperature of the engine while its running in the water? And what is the temp specs for this motor? Has anyone heard of a bad temp sending unit?
Thanks for any help....Sammy

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Author	Topic: 15' Rage Jet boat
whaler_novice	posted 07-15-2002 09:41 AM ET (US) I recently purchased a 1996 15' Rage jet boat. Its a great first boat, and my family and I are having a lot of fun with it. Recently, however, I experiaenced an overheating problem while trolling around in a local lake. I did have four adults and 1 child in the boat. When I pulled it out of the water, I checked it thoroughly for any clogs, or obstructions to the impeller, and found none. Could the overheating be cased simply by operating the boat at slow speeds with a fairly heavy load? Is there something else I should check?
where2	posted 07-15-2002 12:13 PM ET (US) Please include engine info with postings. Was it the 175Hp Merc power unit? Which ever power unit it has, I would consider checking the thermostat, and cooling water pump. Replace both if the boat did not come with an maintenance details. Time to find an engine book that covers the engine/jet pump combo on your boat. Should be some troubleshooting in that... I like to have the books even if I take my work somewhere to be done. With the book, I can usually sort out the theives from the mechanics when they want to sell me parts I didn't really need.
whaler_novice	posted 07-15-2002 01:03 PM ET (US) It's an OMC 115. I have the book. There is no reference to a water pump of any kind. From the diagrams, it appears that the impeller itself acts as a water pump(????). Anyway, there's not much diagnostic info in the book. I've heard that this engine is prone to overheating. I'm wondering if the load and the extended slow speed is what caused the overheat.
rb	posted 07-15-2002 08:25 PM ET (US) Some Rages had a water filter inside the engine box, right behind the seat. I'd check it for sand or weeds.
tuna1	posted 07-15-2002 09:18 PM ET (US) As the person on the board that is the most positive and outspoken about the Rage Jet series,and most opened minded. There are problems with the boats and power systems that Whaler never got to nail down and correct. If in fact you have a OMC Turbo Jet there can be a overheating problem,but it can be solved.Yes there is no stand alone water pump for the engine,it get it's water supply from the jet pump. The OMC should have a large see thur raw water filter/screen mounted on the transum high in back of the powewrhead.If not,the location on the powerhead mounted low to the water line rather than high above the water as in a normal outboard has lead to a clogging problem with the cooling system due to sedimemt in the system base/thermostats. I can walk you thur the problem and the fix, post back here and lets cure your problems!!( I HAVE 3 IN THE YARD,a jet can do what no other drive system can do,but it has it own pros and cons and operation limits )
where2	posted 07-16-2002 12:29 PM ET (US) Glad to see someone can get the novice back out enjoying the water! Good luck. Thanks Tuna1
whaler_novice	posted 07-23-2002 11:28 AM ET (US) Can't find a water filter. Probably because the manual lists the filter as an optional accessory. Figuring out the cooling system is not an easy task for someone 'mechanicaly challenged' like me. I may have to bite the bullet and pay to have someone look at it.
sammysbeachfront	posted 03-24-2010 03:24 PM ET (US) Hi guys! I recently boat a rage jet boat from a buddy of mine that could never get the overheating alarm to go off. After I purchased the boat I removed the engine and uninstalled the thermostats and poppet valves, flushed the engine and filled it with salt-a-way. I let the engine set for a week before reinstalling. I just took her out on her first run and after about an hour the alarm starts chirping before slowly becoming steady. My question is...Can you test the temperature of the engine while its running in the water? And what is the temp specs for this motor? Has anyone heard of a bad temp sending unit? Thanks for any help....Sammy