Jet Boat 6.2 DI Heat Exchanger Dissected
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- Опубликовано: 14 окт 2024
- Dissecting the heat exchanger on a Kodiak 6.2 DI marine engine in jet boat. Admittedly this video is a bit spasticated. But I'm too lazy to re-shoot given anticipated revenue of around $1.59.
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I decided to build a computer model of the exchanger and accompanying hoses, and it turns out the one-pass versus 3-pass flow is not so much different as I first guessed. So... I'm currently turning my boat into a fluid flow test and measurement setup to validate my computer model. Results to follow in a subsequent video.
Perko makes good raw water filters. Would take a lot of stuff to plug them up. Not sure why a manufacturer would not provide one on a boat????.
Normally the raw water intake enters the exchanger where the coolant from engine enters the exchanger i run a big block all day long at 5800rpm and have only used a single pass exchanger.
Have you tried changing plug wires on port side under heat exchanger? Looking for tricks without tearing the Manifolds off. Can’t get the center two onto the coil pack. Dumb design.
Haven't tried. Marine engines cannot have entirely smart design. This is fact.
I have two of these engines in a bowpicker here in Alaska. Obviously headspace is lacking also. It’s the starboard side of the engine that’s the issue. Under the heat exchanger. The first one I pulled the manifold. Pain in the rear getting gasket and manifold lined up and getting bolt lined up and not bugger up aluminum head. If I have to take it off again I’ll probably replace with studs. This second one I’m breaking the coolant system and removing heat exchanger to see witch method is easier. Lol.
@@olinrindal9999 What is the general problem with the engines?
@@idahoviking So there are a couple issues. If you have high pressure fuel pump issues check your HP fuel pump relay in the relay box. The box malfunctions and overheats and burns up the relay. The fix?? Pull the relay out, pull the wires out the bottom of the box, extend wires and connect new connectors directly to relay. I haven’t found a new box to mount remotely so direct connect is the only option I’ve heard of. My relay box actually has burnt marks and easily noticeable. The other issue is the O2 censor. They get wet and malfunction. You can buy O2 censor extensions. It keeps O2 censor out of the riser a bit and saves your O2 censors. This is a new boat for me but these are the issues I’ve been told about with the fixes already done. I haven’t found to much info on them other than your video. Have you heard anything??
These engines have about 1700 hours on them. Previous owner said they have been super reliable other than the 2 issues I already explained. The whole vacuum fill the coolant system has me concerned. Playing on the cooper river we suck up sand from time to time and over heat. I’ve never vacuum filled a system before. But we will find out tomorrow. Lol
Does the jet send a portion of the water through the exchanger or is it a through hull sea cock system
River water is from jet.
Idaho Viking
How does the jet perform if there buts of ice in the river water
Ice and weeds can clog the heat exchanger and cause overheat. So you have to choose the right conditions.
Looks like a miniature boiler tube sheet.
Yep. Optimizing heat transfer has been extensively studied and is well understood. Maybe next I'll build a computer model...