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Page 1 of 3 1 2 3 Last Jump to page: Results 1 to 10 of Thread: Compression for r. Compression for r What should the compression be for a summit xp? If compression is low should i do the top end soon?
Premium Advertiser. Re: Compression for r I was told new should be around Mine was and its 3 years old. I'd be more concerned if they were more than apart. Re: Compression for r I have never seen a stock R with that compression is the high with a snap-on compression tester at feet. Re: Compression for r Depends on what elevation you are at. Stock at sea level ive be told Myself here at ' I should have done a test on my new motor to see what it was at fresh. But before the new top end went in I was at cold and hot, starting to get alittle low I need ring but did the pistons too while I was in there.
Heres a good link talking about hot and cold compression and the fitness of the motor. Re: Compression for r What is the proper procedure for doing a compression test? Should the motor be cold or hot? Re: Compression for r.How to Buy a Used Snowmobile
Originally Posted by nielsy. I have never seen a stock R with that compression is the high with a snap-on compression tester at feet. Originally Posted by treeboy.
Originally Posted by p. What should the compression be for a summit xp? This is on my 08XP, cold engine. Re: Compression for r I was told and up is pretty sold for the R. Page 1 of 3 1 2 3 Last Jump to page:. Bookmarks Bookmarks Digg del. All times are GMT The time now is PM.Help Crappie.
Forum Rules. Remember Me? Forum Main Crappie. Results 1 to 5 of 5. Thread: hp evinrude compression psi? Your's seems to be. A HP Yamaha I just sold ran between and Here's what I'd do. Get a small external gas tank that will hold a couple gallons. Then put in 1 gallon of gas, and one pint of SeaFoam.
Run the motor for 15 minutes at a high idle, then shut it off and let it sit for 15 minutes. Start it again and run it hard for another 15 minutes. This will decarbonize the motor a clean up the motor and fuel system. Then recheck the compression, but first make sure you motor is up to operating temp and have the throttle wide open when performing the test.
To bypass your VRO oiling system, it's just a matter of disconnecting the hoses and plugging them, and also disconnecting the electrical alarms. No need to remove the pump, as it's also the fuel pump. Just make sure anyone fueling the boat knows it needs mixed gas!!!
Checking Compression On An Outboard Engine
I think you will be okay. Thread Starter. Originally Posted by bigfish5. Considering they are all fairly even though it should still run. It may not run exactly right, and most likely the issue will be with the idle. You would like them to all be above 90 and within 5psi of each other. Why do you think the VRo is out?
If it is out and someone ran it hot replacing the head gaskets might bring it up some. Also as shellbakc said decarbonizing might bring it up some. I would think since they are so even you have enough there to make it run.Note here that very few Marine Surveyors in the United States do any form of engine testing and compression testing on gasoline and diesel engines in the survey.
This process forces all of the molecules to be "pressed" together under high pressure. In marine gasoline engines, moderate compression is required, to pounds per square inch PSI.
Some marine engines require as much as PSI depending on their size and application; the manufacturer gives specific compression specifications. If the compression in a gasoline engine is too high, it can cause a problem known as pre-ignition or detonation.
This can be very destructive, causing damage to the internal parts of the engine. However, a diesel engine requires very high compression, usually PSI because it relies on this compression process to ignite the diesel oil. Diesel engines are much heavier and louder compared to the gasoline engine due to the higher compression.
Compression should be checked when any marine engine is running rough or lacking power. Compression testing on your marine engine should be performed every time a tune-up is done as part of preventative maintenance. By performing a compression test, internal engine malfunctions, such as bad valves, piston rings or excessive carbon buildup, can be detected before mechanical problems develop at sea.
It benefits the boat owner to be aware of these problems so they can make an informed decision whether to invest in repairs or sell the boat. Engine compression is checked in different ways for different marine engines. Compression can be tested in two ways. The first method I use involves using a manual, handheld compression gauge. I will always run the marine engine up to operating temperature before beginning the compression test, to ensure that the oil has been warmed up.
A cold engine never, ever tests correctly. I immediately disconnect the ignition module, coil and disconnect the fuel-injection system, then open the throttle to full open position to ensure the engine gets adequate air intake and insert the compression tester into one cylinder spark plug hole at a time.
I then crank the engine over continually for at least five to 10 full revolutions to obtain an accurate reading on the compression tester. If any cylinder compression reading varies 10 percent or more, a problem may exist in one or more cylinders. If the variance is greater than 10 percent, I get into specialized testing equipment I have on-board my service truck to further diagnose the problem. If all cylinder readings are within 10 percent of each other, compression test results are optimal.
The second method of testing that I do on marine engines involves the use of my electronic engine analyzer.By ivanukeNovember 30, in Engine and Transmission. Hello Guys, noobie question here. My truck is blowing white smoke and the coolant tank goes empty every few months. I think there is a problem where the engine is burning the coolant. I found an adapter online for the E7 Etech to perform the compression test, but I'm not sure where it plugs into to create a seal.
I followed the injector tubing from the EUP to the cylinder head and removed the valve cover to take a look, and I wasnt able to identify where I can plug into to perform the test, do I have to remove the rocker arm assembly to get to the nozzle? Any help appreciated. Ok I identified where the nozzle comes out of, initially it was hard to see the plug because of oil but i hit myself in the head for not paying more attention!
My only question now is, the adapter comes with a flange and two nuts. Not sure where these tie into to keep the adapter from popping out? That looks like it will work on a old 2 valve where the injector is on the outside of the valve cover with the one that is on it in the picture.
The other ones is what you use, one is fine thread and I think that one is the one you use on the E tech engine, it should be the same thread as the threads on the injector hold down nut you take out of the head.
The other one that is coarse thread was the early E-7 or E6 injector hold down nut. Thank you for the clarification! Kind of hard to tell from the photo. You can post now and register later.
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Display as a link instead. Clear editor. Upload or insert images from URL. Engine and Transmission Search In. Recommended Posts. Posted November 30, Share this post Link to post Share on other sites. Posted December 1, Posted December 1, edited. Join the conversation You can post now and register later. Reply to this topic Insert image from URL. Go To Topic Listing. Sign In Sign Up.A compression check can tell a lot about the health of your outboard engine.
Here's why and how it's done.
There are four distinct phases in a four-stroke cycle: induction, compression, power, and exhaust. An outboard gas engine needs air, fuel, spark, compression, and unobstructed exhaust — in the right amounts and at the right time. If the piston and rings can't compress the air-fuel mixture in the cylinder so the spark can ignite it, the engine won't run well, if at all.
In addition, if the rings aren't sealing properly against the cylinder walls, they're not doing another job of transferring the heat from the pistons to the cylinder walls. Without that transfer, the piston would grow in size from the heat and "stick" inside the cylinder, causing damage. A compression check can indicate that the piston rings are working properly and that the cylinders are in good condition. The test measures how much pressure is built up by the motion of the piston inside the cylinder, given in pounds per square inch PSI.
Even if you're not a trained technician, you might be mechanically inclined enough to do this diagnostic test. And even if you'd rather not attempt this yourself, understanding how the test works will let you evaluate what a mechanic tells you. There are other diagnostic tests, such as a leak-down test, in which you measure the rate of air pressure leaking from a cylinder while the piston is in top-dead-center position.
This also can help you determine whether an expensive teardown is needed. In principle, the compression test is simple, but the many different types of outboards can add numerous important complexities. The following steps are only general guidance. Your engine may require different steps depending on factors such as whether it's a two- or four-stroke, has fuel injection, has computers onboard, is hand cranked or has a starter motor, and how its ignition can be disabled.
These variations and other issues mentioned below will bear on your ability to do this yourself. Pros tend to use good compression gauges from high-end companies like Snap-On and Mac. But you can also buy a reasonably good compression gauge at almost any local auto-parts store. It should work fine for occasional use. Get the right adapters to fit the spark plug holes in your engine. There are advocates for checking compression on a cold engine, and those that advise doing it only on a warm engine.
My vote is for the latter; it gives a reading that's accurate and relevant to the engine when it's running. If you're running the engine with the boat out of the water, follow the engine manual on how to do this — most likely, you'll need a set of outboard muffs or a barrel to provide cooling water. Begin with running your engine until it warms up to normal operating temperature, then follow this six-step process. Beware of the danger from a spinning propeller should you inadvertently start the engine or shift while setting up.
Do what is required to prevent the ignition from firing. This may be simply pulling the engine kill switch. If you must disconnect the battery, you'll have to reconnect it to crank an electric start. Remove all the spark plugs. Number the leads so that you know where they go back. If ignition occurs and the leads or plugs aren't properly grounded, the ignition could be damaged. Also, a spark could ignite fuel vapor emanating from the open cylinder.
A spark tester for all plugs can help here. Many recommend moving the throttle well forward to facilitate air entering the cylinder as you crank the engine.
However, with an electric start, you may not be able to do this and also crank the engine unless you have a bypass button, usually in the throttle hub. If in doubt, consult your owner's manual. Also, some engines get enough air intake, without doing this, to do an adequate compression test. Screw your compression gauge into the first cylinder.Log in or Sign up. Mar 5, 1. So I recently took my 07 etec in for diagnostics as I am trying to sell my action craft.
Turns out I have 2 cylinders with low compression. Sometimes it will die when moving from neutral to fast idle. So I guess my question is what would you guys recommend doing with motor? Motor has about hrs. Im not a mechanic, nor do I know anyone who buys older used motors. I lowered my asking price on boat 3k and let everyone know what's up in my Craigslist add, but I would like some other opinions.
Compression test on 800?
Not wanting to repower since I would feel like I had to keep boat them. LtShinysidesMar 5, Mar 5, 2. Call a shop that overhauls outboards and see if they will bore it out or sleeve those two and replace rings? Smackdaddy53Mar 5, Mar 5, 3. State fish rob and Smackdaddy53 like this. Mar 5, 4. FinsleftMar 5, Mar 5, 5. Once you verify that original test The hard part when facing a re-build or replace is the cost and whether it's worth it in your situation.
If the motor's a loss -you can still recover some of it's value by parting out the lower unit, the cowling and anything else with a money value. To get an idea of what I'm talking about go to E-Bay or similar site enter make, model and year of your motor and see what's actually being offered for sale there. That might give you an idea of what your options are Boatbrains likes this.
Mar 6, 6. Thanks guys. I think I may get another mechanic to take a look. Finsleft has got my optimism sparked. The place I took it was a first for me, but they are pretty reputable. I'll keep you posted. Thanks again. LtShinysidesMar 6, Mar 6, 7. Def get a second test done! Something is off about those numbers After second test if still reading low, run a shock treatment of brp carbon gaurd through it.
It should not be running and performing with one cylinder that low never mind two cylnders!
Side note If the hg failed between them this could be possible, but the test should have shown this is what was happening and a hg replacement is not too expensive!Evinrude E-TEC sets the performance standard for outboard engines. Each engine is tuned for extra power and speed. If you like pushing limits in horsepower, speed and torque, then consider our High Output Series.
The auto winterization feature fogs the engines itself in minutes, with no trip to the dealer. An Evinrude E-TEC engine does not require belts, camshafts or exhaust valves, which means there are fewer parts to wear down or malfunction than a four--stroke outboard. Extend the life of your outboard and your boating season. Get even more extra miles per hour with the Straight Leading Edge gearcase. The Evinrude SLE gearcase features high-efficiency water pickups and a weed-slicing shape up front, for a cooler-running engine and ultimate durability and reliability in the long run.
What your boat needs. Find the right outboard to.
16 XM 800 ETEC Lost Compression
E-TEC 15 H. Portables 3. All the horsepower you need from 3. Bore x Stroke - in mm 3. Displacement - cu in cc L Gear Ratio shaft length 1. Weight - lbs kg Starting Electric. Controls Mech. Steering Remote. Gear Ratio shaft length 2.