Turning point [Click Here] Solas [Click Here] Sierra [Click Here] SeaDog [Click Here] Airhead [Click Here] SportsStuff [Click Here] FuzionX [Click Here] Garelick [Click Here] ProMariner [Click Here] SeaDek [Click Here] Minn Kota [Click Here] Attwood [Click Here] Seasense [Click Here] Jabsco [Click Here] Starbrite [Click Here] Westland [Click Here] EnduraCover [Click Here] Taylor Made [Click Here] Rush-co [Click Here] KeelGuard [Click Here] Revere [Click Here] Kent [Click Here] Evolution [Click Here] Fusion [Click Here] Wise [Click Here] Redstar [Click Here] Fireboy [Click Here] AM [Click Here] Click to Print Coupons Boat propellers Boat covers Boat bimini tops Lift canopy covers Engines Repair manuals Engine parts Controls & steering Marine electrical Fuel tanks Maintenance & repair Boat seats Hardware Trailer parts Anchor & dock Plumbing Life jackets Watersports Marine electronics Trolling motors Fishing Cabin & galley Lettering Safety & survival Click to Print Coupons Turning Point [Click Here] Click to Print Coupons Garelick [Click Here] Solas [Click Here] Click to Print Coupons Sierra [Click Here] Click to Print Coupons Shop All [Click Here] Switches [Click Here] Windshield Hardware [Click Here] Bimini Hardware [Click Here] Drink Cup Holders [Click Here] Click to Print Coupons Slice [Click Here] Liquid [Click Here] Doggy [Click Here] Bertha [Click Here] Kneeboard [Click Here] Light [Click Here] Seat [Click Here] Dock light [Click Here] Chargers [Click Here] Click to Print Coupons Sheets [Click Here] Springs [Click Here] Minnkota [Click Here] Mushroom [Click Here] Bilge [Click Here] Sidemarker [Click Here] Pump [Click Here] Buddy [Click Here] Bearing kit [Click Here] Click to Print Coupons Bilge [Click Here] Bottom [Click Here] Deck [Click Here] Wash [Click Here] Hull [Click Here] Degreaser [Click Here] Wax [Click Here] Oil [Click Here] Brightener [Click Here] All Starbrite [Click Here] Click to Print Coupons Seasense [Click Here] TaylorMade [Click Here] Click to Print Coupons Westland [Click Here] Click to Print Coupons Covers [Click Here] Tops [Click Here] Click to Print Coupons TaylorMade [Click Here] Click to Print Coupons Rush-co [Click Here] Click to Print Coupons keelguard [Click Here] skegguard [Click Here] megaware [Click Here] Click to Print Coupons orange [Click Here] blue [Click Here] blue red [Click Here] pink [Click Here] green [Click Here] yellow [Click Here] shop all [Click Here] Click to Print Coupons fuzionx [Click Here] body glove [Click Here] lettering [Click Here] Click to Print Coupons Wise [Click Here] Click to Print Coupons RedStar [Click Here] Click to Print Coupons Click to Print Coupons Fireboy [Click Here] Models [Click Here] Click to Print Coupons Monster [Click Here] Click to Print Coupons Click to Print Coupons
Click here to view this email newsletter online with images
The iboats.com Review
Shop our most popular categories Boat Covers Engine Parts Props Trailering Blowout Specials

In This Issue

Front Page

Insurance Corner | Operation Dry Water by NBOA Ask the Experts | Back to Propeller Basics Tips by Tim | 8 Tips to Keep Your Boat Motor Cool Ask the Experts | Docking Your Boat Making Waves Sale | Final Days up to 60% Off! Red Sky at Night with JB Cornwell | Of Pecan Harvests & POWís Nautical Humor Stupid Human Boating Tricks You Wonít Believe Your Eyes Featured Products and Specials


Seadog [Click Here]


Tips by Tim | 8 Tips to Keep Your Boat Motor Cool
Article by Tim Banse, Marine Engine Digest

Overheating is a major cause of death for marine engines, including gas and diesel stern drives, inboards and outboard motors. In fact some industry statistics say as many of 70% of all premature engine deaths emanate from the malady. Saving the day, some modern power plants have engine warning systems that literally sound the alarm when the temperature begins to rise towards dangerous temperatures. When that happens, onboard firmware automatically reduces rpm so the boat can, in most cases, limp home. That technology is a great fail safe. But what would be even better is some kind of plan to prevent the overheating in the first place. With that in mind here are some ideas to keep in mind.

  1. Most of the time engines overheat because the impeller isnít pumping water to the cylinder block and heads. So naturally it follows - keeping track of impeller health is a good idea. On inboards and stern drives that can be as simple as removing the inspection cover and looking at it. You donít necessarily have to remove it. Visually determine whether all of the blades are present. And are any of the blades showing cracks or checkering? If so donít hesitate to replace the worn impeller at once. Not only is it in danger of complete failure, when blades strip off they flow downstream into the engine where they could obstruct cooling flow.
  2. Another important checkpoint is the raw water filter. Go to the trouble of making sure itís not plugged. At the same time check all of the cooling system hoses, one at a time. Start at the hull thru fitting. Visually inspect the hoses with a flashlight looking for checkering or cracks, once again, clues that near term failure is possible. Next, squeeze each hose in turn. A cooling hose should feel supple, and not hard. Most of the time when you find a hardened hose it will be on the engine. Thatís because ambient engine heat hour after running hour has baked it to a crisp.
  3. Outboard motor impellers are strategically located in the lower unit. The lower unit is exposed to sunlight, which over time can bake the impeller. Baked impellers have lost resilience. Hard impeller blades strip off. Also over time, and this includes inboard and stern drive impellers, impellers lose their flexibility and take a set - meaning the blades donít stick out from the hub at a 90 degree angle and are curved. When that happens they will still pump water, just not very much. Knowing that, some boat owners make a preemptive strike and remove and replace the impeller every two or three years.
  4. Another overheating culprit is the thermostat. Sometimes they stick open, in which case the engine may not warm up to its normal operating temperature. And in other instances the thermostat sticks tight in the closed position. The good news is changing a thermostat is easy even for a fumble fingered do-it-yourselfer.
  5. But what do you do when you think the engine is overheating and you donít have, or simply donít trust, the temperature gauge? The answer is as simple as the sea is salt. Shut down the engine for safety sake. Then carefully touch the cylinder head. You should almost, but not quite, be able to lay you hand on it. But if it is sizzling hot, thereís an overheating problem. If youíre squeamish about touching a warm engine, no problem, flick some water onto the engine and watch the results. If the water beads up and sizzles away into evaporation, thereís a problem.
  6. There are other high tech solutions worth considering. For about $50 and up you can buy an infrared temperature gun. To use it, simply aim it at the work piece and squeeze the trigger. The temperature display tells you how hot it is. Also you should know about temperature crayons. They come denominated in different temperature ranges. With this method, scribe a mark with the crayon on the work piece. If the crayon residue melts then the temperature is as least the rating of the crayon.
  7. Besides the temp gauge, outboard motors also shoot an indicator stream that shows the impeller is hard working. Sometimes when the stream stops it means the impeller is dead. Sometimes it just means the indicator streams plumbing is plugged up. Thatís why I have a two-foot section of 300-pound monofilament fish line under the cowling tied to the engine. If the stream stops, I jab the stiff monofilament into the orifice and clean it out. If water begins to flow anew, all is well.
  8. Finally, the best prevention for engine overheating is to trust the temperature gauge and monitor it often. Consider rotating the temp gauge so its needle points straight up when registering normal engine temperature. Then if the temp begins to rise youíll see it immediately.

iboats.com carries all brands of impellers, thermostats, hoses, gauges and more. Ė click here to shop engine parts.

Tim Banse is a marine engines expert and has written about propulsion for Popular Mechanics, Yachting, Motor Boating, Boating Industry and other publications around the world. His current pet project is www.MarineEngineDigest.com, a source for free information about outboard motors, stern drives and inboards. Timís articles will be seen here and in the iboats.com blog, plus always at www.MarineEngineDigest.com.



Send Us Feedback Email to a Friend Back to Front Page
Disclaimer for iboats.com Review Articles:
The information and articles provided in this newsletter and/or in any publications provided by iboats.com are for general purposes only and intended to help you make better decisions about your boat and boating equipment. Such information is not intended to substitute for instructions from the manufacturer, dealer or marina about your specific boat or boating equipment and iboats specifically disclaims any liability for damage to your boat or equipment arising from your following suggestions in this newsletter. For more details about your equipment or application, we suggest you contact the manufacturer of your boat or other equipment.

Copyright Notice:
All materials contained on the iboats.com site and on this Review publication are protected by United States copyright law and may not be reproduced, distributed (except for use of the iboats.com "Email to a Friend"), transmitted, displayed, published or broadcast without the prior written permission of iboats.com or in the case of third party materials, the owner of that content. You may not alter or remove any trademark, copyright or other notice from copies of the content.

Promotion Details:
SALE DETAILS: Limited time offer - iboats.com July Making Waves Sale effective dates July 7-31, 2011. Sale prices are not valid on previous purchases and cannot be combined with any other promotional offers. Free shipping applies to UPS Ground shipping only within the contiguous US states. For expedited shipping, additional charges apply. iboats reserves the right to cancel or modify all or parts of the sale offers at any time and without prior notice. Typographic, photographic, and/or descriptive errors are subject to correction and iboats.com assumes no liability or responsibility for such errors. Copyright iboats.com 2011.