Bth8
24.05.2021 18:04:47
Consequently, what kind of oil does my boat take? here
See full version: What kind of oil does a MerCruiser 5. 7 take
Consequently, what kind of oil does my boat take? here
If you operate your boat in consistent temperatures, choose a single-weight oil (e.g. SAE 30). If you operate your boat in a wider temperature range, select multi-viscosity oils (e.g. SAE 10W-30). They behave like thin oils in cold weather, making it easier to crank the engine. here
How much HP does a 5.7 MerCruiser have?
Subsequently, question is, can you use regular motor oil in a boat? Use the right lubricant —Marine and auto oil are not interchangeable. Although oil in a four-stroke marine engine performs the same function as it does in an automobile engine, passenger car motor oil should not be used in marine engines. Car oils also fall short in the protection department. here
The owners manual suggest 40W (for our temp range) or 25w - 40w merc. Murrys or Kmart usually has the val 40w oil. [links]
Here's the official answer. If you don't want to use the oil suggested below. Use whatever you like. [links]
You're going to get answers that include every type of oil made for internal combustion engines. (it's all been tried successfully) here
Is there a consensus on what type of oil, straight, multi weight, etc. here
I bought an old stock, but new 5.7 longblock. This is a vortec engine with roller cam, cast iron high rise manifold and Edelbrock carb. I have used Royal Purple break in oil for the first 10-12 hours. I am ready to change oil and filter and start using a good synthetic.
What type of oil should I use? Can I use synthetic oil? [links]
it makes a distinct sound when running with a leaking water passage. i don't know how to explain it. it's not louder, per say and at first, it's just different. the loud comes when lifters deflate and things start to clank about- water makes a terrible lubricant. here
head gaskets usually don't let loose oil. a bad intake will- which was my initial tell- usually that happens with the dowel gasket across the valley letting loose. now if you were flooding the engine and intake manifold with water you could see why it would be pushed out.. (an aside, make sure and check the oring on the dizzy too). running at more than around 900rpm, the engine produces enough exhaust pulse to push out water from exhaust manifolds.. when you come off plane (or rev down) that pressure comes back with a vengeance and can overwhelm the exhaust, but that usually kills the engine quick like (hydro-lock). an intake on the other hand will run okay cold, but get her to temperature and when the circulating water generates pressure enough to overcome the cylinder pressure (primarily on the intake stroke) GULP. and it chases the same 'leak' on the compression stroke forcing the water into the valley and then crankcase. and it's got to go somewhere- either pushes the dowel gasket out or through the dizzy oring, or even through the PCV and/or fill cap. or. through where the head gaskets used to be.
the only way to tell for certain is to pull it off and investigate the water ports- it's most likely the rear one on the starboard side, which is the most common (rear) and because you said the starboard side was water/oil painted.
if it is a 93 engine matching the boat year, it is an older vortec at best- and one which used the non-angled bolts to affix it- and not in the same placement as the newer ones with the angled bolts. more
without a closed system it's almost impossible to pressure test a water jacket. that's unfortunate. without coolant it's hard to see the tell-tale marks water makes across the expanse of metal (on the heads and on the intake manifold), but i bet you can still see them when you take it off. here
There are a few motor oil viscosity options for Mercruiser/GM 350ci/5.7L engines. The 10W-30 grade seems to be the most popular choice for these engines. Others opt for 10W-40 or Mercury’s 25W-40. here
A reader asks: I’ve got a 1988 10 meter prowler with twin-inboard Mercruiser 5.7L engines that produce 260 horsepower each. As these engines have flat tappet cams, what would be your engine oil recommendation?
Our Answer: GM produced 5.7L (350 c.i.) engines with flat tappet cams for Mercury up until 1995. Making a proper motor oil choice for these engines is crucial. Flat tappet camshafts require high ZDDP (zinc dialkyl dithiophosphates) levels.
Diesel engine oils meeting the API CI-4 or CI-4+ specification was designed for engines made prior to the 2007 model year. These oils tend to have higher zinc and phosphorus volumes. Provided that the zinc levels are determined to be in the ballpark, diesel oils with these specs can be great candidates for gasoline-powered Mercruiser engines with flat tappets cams. Avoid diesel oils with the newer API CJ-4 or CK-4 specifications. They do offer world-class protection in diesel engines. However, these diesel oils do have lower zinc and phosphorus levels. more
If wish to use 10W-30 in your engine with flat tappet cams, our best solution is AMSOIL Z-ROD 10W-30 Synthetic Motor Oil. This product boasts 1440 ppm of zinc and 1320 ppm of phosphorus for powerful flat tappet protection. here