1/11/2024 0 Comments Inboard outboard mercruiser![]() Worn or damaged water pump/impeller, clogged passages, cracked/kinked hoses, among other things can easily create an overheat condition, which is one of the deadliest conditions a motor can face. The cooling system of a boat motor is one of the most vital necessities it can have. Johnson Evinrude Mercury Mariner Force Chrysler Yamaha Mercruiser OMC Cobra Like its small block V8 counterparts, GM Powertrain also sells the motor for marine and industrial applications.Inboard stern drive cooling systems and how they workĭIY inboard outboard boat motor parts & accessories Commencing with the 2014 model year, a new Vortec 4300 based on the GEN V (LT1) Small Block Chevrolet will become the new base motor for the next generation Chevrolet Silverado/GMC Sierra light duty trucks and will be phased in throughout the rest of the truck/van line after the 2015 model year, which will signal an end to a design dating back to 1955. The only vehicles using the 4.3L are the GMT900 light duty trucks and vans. It is gear driven off the timing chain, and therefore a new timing chain cover was designed for these balanced 4.3L V6s.Īs of the 2013 model year, the 4.3L is still in production although the distributor was eliminated in the late 2000s where a coil-on-plug ignition system was phased in. The balance shaft on the 4.3L is installed above the top timing gear, and runs through the top of the lifter valley. Even though the 4.3L is an even fire V6, the 90-degree block layout is not ideal for smoothness. 1987 saw new center bolt valve covers and hydraulic roller lifters.įor the 1992 model year, the 4.3L had its block design modified to allow a balance shaft to be installed. Some 1985 model year vehicles would have a 1986 engine due to service replacement - cylinder blocks were shipped with oil pans. In 1986, the rear main crankshaft oil seal was changed from a two piece to a one piece seal. In 19, the 4.3L engine saw engine design upgrades similar to the Chevrolet small block V8. The 4.3L also used larger valves than the 229 cid V6, with a 1.94-inch intake valve and a 1.50-inch exhaust valve. The connecting rods used on the 4.3L are therefore unique to this engine, being 5.7 inches in length, but having the larger 2.25-inch journals. Consequentially, rod journals were increased to a larger 2.25 inches. To create a true even fire engine, Chevrolet produced a crankshaft with 30-degree offsets between each rod pin. The 4.3L V6 has a 4.00-inch bore and a 3.48-inch stroke, identical to the 350 cid Chevrolet V8 engine. It also replaced the 250 cid in the Chevrolet full-size trucks and full-size vans (including the mid-sized Astro) as the new base six-cylinder engine. This engine was introduced in 1985 as a replacement for the 229 cid V6 in the full-size Chevrolet, the Chevrolet El Camino and Monte Carlo. The 4.3L (262 cid) V6 is the last and most successful engine in the Chevrolet 90-degree V6 engine family. Water gets into the sand, no way to get out with out flushing and I dont know how to do that. If it is a boat that has seen lots of sand docking, the manifolds may be full of sand, which is where you find broken manifolds in winter. Get used to doing them yourself.Īll in all- make sure you check it out completely before handing over money, compression check, test ride, and have someone that knows boats go with you, he will be able to 'feel' problems. They are a replace every 2 years if doing lots of tubing and turning, or even yearly. ![]() VERY important that you find all 6 drain plugs, pull all hoses when winterizing, let it dry for a few days, then fog it and fill with antifreeze.ĭon't store the boat with the prop up, you will wreck the exhaust boot and pay $1000.00 at a stealership.Īlpha 1 is terrible on ujoints. I have had several, latest is a 5.0L 350. 4.3l Merc is a 302, bulletproof AS LONG AS YOU DO THE MAINTENANCE.
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