Marine Cooling Systems - The Heat Exchanger - Maintenance Mondays 

I’ve only had a boat on freshwater lakes. I can only imagine the level of maintenance that needs to be done for boats on saltwater. Great video!

I like the episodes where you do electrical work and catch things on fire ! Show more of those !! Thanks for sharing !

Just a couple of observations or tips from an experienced boat tech(20+years). Mechanically everything’s was right. You may want to look for a petcock to assist in bleeding the air out of the cooling system on the initial fill. Also, there are 2 different coolants out there, conventional and Diesel engine coolant. You can use both but with conventional, you’ll want to add a diesel coolant additive on a Diesel engine obviously. Be sure to observe the concentration as it is important depending on capacity. The Diesel engine additive(which is already in Diesel engine coolant) keeps cavitation erosion from occurring on the engine cylinder liners. The conditioner coats the liners and takes the cavitation erosion instead of the liners. Which is why the conditioner is a consumable. Also, do not over concentrate the conditioner, it will fall out into solids over time and plug the heat exchanger particularly when it sits for a long period of time between uses. Hope this helps in maintaining your vessels power plants.

Please continue with Maintenance Monday. One of the most entertaining aspects of boating is fixing your vessel in exotic locations. In this regard, boating is infinitely more enjoyable than aviation! 🇺🇸⚓️

The advice to take a picture before proceeding is one of the best tips you could give. I do the same these days for almost anything in addition to lying removed parts out in order of removal to give me a reassembly order. Has helped a number of times in the past as reassembly order is not always obvious and sometimes the correct order can seem wrong. Saves a lot of time having to tear a device apart again to correct the assembly.

I love the diesel engine sound in the beginning 😍 I just had a big service on my generator, including the disassembling and cleaning of the heat exchanger. Preventive maintenance is king💪🏻

With most engines, replacing coolant you should run it long enough for the thermostat to open. That will help get rid of any air. Also there may be a coolant bleed screw somewhere.

Love watching the maintenance Monday almost as much as watching your crew work the boat.

Wow that was awesome. So glad the d-bag-beard is back.

Love maintenance Mondays. Thanks Bobby.

Maintenance Monday 👍👍👍. It’s nice to see the mechanics of boat maintenance. Thank you 👍🇺🇸😎...

There is not a lot of repairs the average person can do on engines anymore but the few you can do is always very satisfying to do yourself

Great job B just a reminder razors on next shopping list

This is I didn't do the maintenance Monday. You did zero maintenance until it broke lol. Im a big fan and love this type of content, thanks for posting. Looking forward to more marine repair and upgrades.

If there is a thermostat on the generator, its going to block coolant flow to the engine until the engine reaches the right temperature. So, check top up the coolant after its ran and warmed up to temp and cooled back down. Never open the coolant cap when its hot as it will spray hot coolant all over the place. Ive even left the cap off as the engine comes up to temp but some of the coolant will come boiling out right before the thermostat opens, then the fluid level drops and can top it up.

Really interesting how small a liquid-liquid heat exchanger is compared to a air-liquid heat exchanger. Very Cool!

great info... I always used the analog of the heat exchanger being the equivalent to a radiator... except that it's sea water rather than air... and it was interesting to see the "No Step" decal under the gen cover....right where a foot was ;)

That was really interesting, yes please lots more of them 👍😁

Thanks man.. very thorough and understandable... you rock Bob

Thanks a lot Bobby for the honnest presentation of "the other side" of Saling Dooldes life style : living on a boat means fixing jobs are never finished ;-)

Great stuff Bobby. 👍🏼

Love these. Thanks so much. Thanks from NOLA.

This is to Stephanie...Stephanie sooooo glad you are on the show. You are the best..!!! Please ask Bobby if he ever needs any tools, meters or parts to keep me in mind. I may be able send him what he needs at no cost to you guys. Just a suggestion. Thanks

Thanks for sharing Bobby.

Excellent job Bobby as always. Ah those damn sacrificial anodes or combination of the saltwater. That’s why they suggest changing them out once a year. Great preventative maintenance tips Bobby

Captain to Captain....I like these Maintenance Mondays videos

I agree with other viewers, Bobby. I like the occasional maintenance video and the bits you include in the normal vids. Interesting to see some of the things that can happen on a boat one would not think of. Bigger boat, more chances of failure.

Definitely my new fav video.

Interesting! I like it! Great job, thanks.

A neat trick, copper coolant loop pipe line fitted outside hull, maintenance free engine cooling. 👍

Well....we know what everyone else is here for and didn't get! Me too, but I thought Bobby explained the heat exchanger quite well, even though I I have done many jobs like this before. Others complain about it being all about T&A.......Bobby can't seem to make people happy, but I won't say he can't win. His job and location is much more glamorous than where I have replaced heat exchangers.

Bobby would you please start wearing Maxiflex gloves !!! You won't regret it 🤙🤙

"Fins" equal copper tubing inside the heat exchanger. You can have those boiled out or do it yourself with a bucket and some "Barnacle Buster."

Great informative video 👍 much appreciated thanks 😊

Wish you would have posted this a month ago. I recently learned the hard way. Lol. Great episode!

very informative, good stuff, thanks!

Excellent tutorial✅ thanks

Worth watching... Thank you!

I’ve got a Perkins 6354 that needed remarinized . The old bowman heat exchanger was toast. It cost around 6000 grand just for a refit parts . The old exchanger isn’t made anymore . 15 years ago you could still get them . Wait for it . Ten grand. I think they called them mani coolers. The exhaust and intake and exchanger was one piece on the side of the straight six . I can’t find the sacrificial on my northern lights generator. 150 bucks the gods where in your favor. Sv Bohemian

Nice job, never done the powerboat thing, anything is fun on the water in the BVI’s though 👍

If you haven't been told already, those hose clamps are called Jubilee Clips in the UK..

Don’t forget the cooling system pressure cap (radiator cap). Automotive cooling systems must be pressurized to work properly. It looked like a pressure cap you took off the generator to refill the antifreeze. If it has a pressure rating on the cap, it needs to be tested. I would think it would be inexpensive enough to just replace it. I enjoy your videos, thank you.

Great video,very informative..ty

Awesome video

Nice video!

I must confess, it's smaller than I expected. That being said, there's no point in it being any bigger than it needs to be to do the job well. Seriously though, thanks for the informative video! My wife and I hope to be cruising in a few years and these maintenance items are crucial to having a pleasant and carefree cruising experience! I'm looking forward to the next Maintenance Monday!

Good job

Wondering if Bobby ever fix Taylor plumbing???

Installing an in-line strainer would prevent debris from the pump to go in the eat exchanger. Those strainer Y style are very affordable and would ease next maintenance if the impeller ever breaks.

Bobby check the replacement coolent. Usually you don't want pure coolent. A 50/50 mix of coolent and fresh water is more efficient. Great information video.

It would be interesting to see the result of soaking the old heat exchanger in a bucket of plain vinegar for a week to see how much of the rust and corrosion is is disolved and removed.

Yay finally no clickbait girls! & even a flying doodles episode! back to the good stuff well done ;)

A heat gun is good for heating up the rubbery hoses and makes it a lot easier to take off and put on.

Great video

Good one. Keep it up.

Good Instruction !

This is replacement NOT maintenance. Maintenance prevents failures BEFORE there is an issue. Big difference. (proactive vs reactive) You don't wait for the impeller or zinc to fail, then decide to do what should of been done before hand. Regular scheduled replacement of both prevents all the nasty things that happen that can cause major issues at the wrong time.

Every day of the week could be Monday, so long as they were Maintenance Mondays!

Nice job, thank you

Great job on explaining in detail , very easy to follow, kudos, or ...lol you get a slice of rasin pie!. Great job Bob Hefner, lol

nice job

Great Video…

We use a heat exchanger in our carpet cleaning service truck... but we're doing it to make hot water rather than to cool the motor... we have a 130 gal fresh water tank on the truck, we run it through the heat exchanger and back into our cat pump, which is similar to a pressure washer, spray the carpet with a cleaner, then rinse at about 450psi with a wand and extract as you rinse...the water is usually in the 200 F range. One of the few maintenance videos I've watched where I understood it completely... lol

I occasionally will do a fresh water flush on the motors and generator. Pretty simple process. 1- Close sea cock. 2- Open strainer. 3- Hose with salt away 4- crank up motors and run for about 5 minutes. If you do this after long runs as well as when you are leaving the boat for a while. Perko makes a system that you can simply attach a hose and turn it on and then start the motors.

Did you drain the coolant into your bilge? Isn't that kind of bad as that will be pumped into the ocean eventually?

Beaches and hoses. Thats the life.

Niiiiiiiiiiiiiiice ✌🏻️ Thanks Bobby as this helps a ton to know what to expect. ✨🌊🏝👙🌞✨

love this channel

excellent

It's good to see the hard work behind the dream! Great Job!

Maintenance Monday, on a Monday. Amazing!👍🏻🤔🤣😂😎

I was hoping Steph would be there to hand you wrenches.

The green coolant turns acidic after 3 years rust out your block make sure change it every 3 years. The newer stuff orange will not do that but you can't mix the two really can't get the old stuff out that easy even filling and draining still have some in the low spots of the block. The only way is to open the drain plugs on the block drain and refill with water run drain again then it will be cleared out. Lot of times I don't even bother with the new stuff if the engine had old green in it just keep using that and flush once every 2-3 years.

Very interesting, Captain! Thanks for sharing!!

Bobby, what changes have to be done for a motor yacht to function "upstream" in fresh water? I've heard of a 100' yacht going all the way up to Chattanooga on the Tennessee River.

Good video, but what do you do with the coolant that went into the bilge. Do you just let it pump overboard with the bilge water?

I love it that your not only a pretty face but you can actually do something 😂😜

Yea Bobby!

Great video, Bobby. Love this kind of content. Us RV owners would love to see this on Glamping Doodles as well. Peace out.

Seems the work is never done, at least your in a lovely place to do it.

More, please.

The nuts and bolts of cruising.

A ground connection on a boat, didn't know about that, every day is a school day.

Where did the old coolent go???

ZINKS can erode fast in heat exchangers. Warmer water they can go in 30 days.

It would be nice if the main engines heat exchangers were as cheap as that one.

did you have any specific training before you started cruising or did you just pick it up as you go along ?

Lekker man lekker

They’re called jubilee clips here in the UK.

So, I take the cooling system on a naval engine is a bit diff from that in a car engine with it's surge tank, hence your topping off with coolant? :-)

You should right a book.

Hey Bobby I know this is off the subject. How is Taylor doing? We havnt seen a video from her in a long time. We miss her.

Is there a strainer on the raw water before the pump?

Are there any software packages for organizing a boat maintenance program similar to those for aircraft?

This is great! Question though: why would the rubber parts of the impeller be designed to break down and then clog the heat exchanger? Sounds like a racket!

T&A BABY

Mix anti freeze with distilled water.

Nice! How did you gather & dispose of the old coolant??

Bobby, without filming time, how long start to finish? Love your vids brother, quick question, sail or power??

Anyway you could get Steph to be your assistant? 😍