2 stroke 6 cylinder compression test mercury|How to Compression Test on Mercury 2 : distribute Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Here is everything that you need to know about outboard compression tests. How to do them and what the results mean for you! What .
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Here's how to do a compression test on your Mercury outboard 2-stroke engine. Or download a repair manual instantly here. Compression test need to be done with the throtal in the WOT position and the motor should be turned over 3 to 4 times on each cylender. From the readings posted at 3 .
A week or so later, the motor was started and it was firing on all 6 cylinders and was able to pull through the full RPM range, perfromed a "finger" compression test and all .
If your outboard engine doesn't start, run rough or without much of a power, do the compression test on all the cylinders. Go to the Engine FAQs forum ^^^ and do the compression test by the instructions there. Post your results here. What to look out for is one or two cylinders that compress .Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Here is everything that you need to know about outboard compression tests. How to do them and what the results mean for you! What .
On a 4 stroke engine, most mechanics and dealers will perform a leak down test, to see how much pressure escapes over a set period of time. On a 2 stroke engine, a compression check .Generally, readings below 90 PSI for modern two-stroke outboards indicate a problem; most will produce cranking compression readings in the 90 to 105 PSI range, depending on the engine year, make, and model.
A good compression reading for a 2-stroke engine is between 110 and 130 psi, as the color change from red to green indicates on the Buckshot Racing #77 Compression Gauge. The difference between the highest and . 2002 Mercury Outboard 150 hp Salt water series 2 stroke engine. Pressure test was performed with hot and cold engine using two different tester kits.
I have worked on cars and 2 stroke motorcycles most of my life, but never tore into an outboard. I have searched through this forum and found some great info but wanted to throw this out to those of you who are more experienced. So: I did compression test and found no compression on the one cylinder. Re: 2002 Mercury 150Hp xr6 Compression and overall reliability of outboard From Mercury Service manual COMPRESSION All Models – Using a fully charged battery, throttle shutters wide open and cylinder block warm 110 – 135 psi (753.3 – 924.5 kPa) Variance between cylinders should not exceed 15 psi (102.7 kPa) Mercury 90HP 2 Stroke cold start, idle, forward and reverse gear engagement, compression test Compression is still 73#'s on both cylinders. My Mercury Factory service manual which covers 2 stroke motors from 6 to 15 HP quotes "Normal Compression at 115 to 125 PSI. The difference in compression readings between each cylinder should not vary more than 15%.
Looking to purchase a 1993 Mercury, 9.9, 2 stroke outboard. Has very low hours over last 15 years and has not been used in about 6 years. . 1993 Mercury, 9.9, tiller, 2 stroke compression. . 9.9, tiller, 2 stroke compression. A good compression test for the motor is done with the throtal in the WOT position as the cyclenders will get more . Doing a compression test on your Ford or Mercury Taurus, Sable, Windstar equipped 3.0L and 3.8L V6 is an easy test to do. . This article will take you thru' the test and interpretation of the cylinder compression results in a step by step fashion. By the way, this article is geared towards helping you solve a misfire condition or misfire .
2006 Mercury 50hp 2 stroke compression. Thread starter dhearn0513; Start date Dec 20, 2014; D. dhearn0513 Contributing Member. . I just bought a boat with this engine and when doing the compression test all three cylinder measure 110 psi. I know that this is good numbers but just wondering what is was from factory. . My twin 88/85's have . I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and run well. During a cold engine compression test, the cylinders both hit exactly the same at 100lbs. . If i want to know compression loss I can just throw some oil in the cylinder that will tell me the difference. That motor has low compression I would have thought .
Performing a Compression Check
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Mercury 2 stroke 2003 225 HP Selling motor, To obtain best reading should I - Answered by a verified Marine Mechanic . Need to compression test a 2008 135 hp mercury optimax and cylinder 3 and 5 injectors not firing I have spark plugs out do I comp test with lanyard switch of or on thanks Compression Test . I am currently looking at a used boat with a 2002 50hp Mercury 2 stroke engine. The private owner says the compression test shows each cylinder at 150 PSI which he claims is excellent. Maybe it is .i dont know anything about compresion but that it does indicate the key "condition" of the. Re: 75hp mercury what is too low of compression? A fw years ago my son's Merc 115 HP inline 6 had a scored cylinder; we got 118-120 PSI on the 5 good cylinders. The bad cylinder was, of course, shot. Incidentally, I was able to get the gauge on all 6 cylinders; I've forgotten how I had to hold my mouth to get to one. Is 120 psi good compression on outboard? For a general number scale for compression. Two-stroke engines should be somewhere between 100-120 PSI per cylinder. Then four-strokes are going to be somewhere between 150-210 PSI! You will see a good compression reading of 150-160 PSI. How much should an engine compression test cost?
Mercury Outboard Compression Test with Cold & Warm Engine
Re: 1999 Merc 25 2 stroke compression? Well I retested the compression once the engine was warm and I got 75psi on one cylinder and 90 on the other. I then let the motor cool back down and again read 90 and 100. When the engine was running it was running smooth - it just did not seem to have a lot or as much power as it had last year. I am looking at buying a 1990 Sea Ray 180 Bowrider. It has a Mercury 150, the picture looks like it says Black Max on the side. I have not seen the boat in person yet, only pictures. The dealer says one cylinder was "scorched" resulting in excessive cylinder leakage and low compression. Not sure what scorched means. After owning for two weeks, I decided to do preventative maintenance (spark plugs, wires, oil, fuel and air filters, etc.) also decided to do my own compression check and purchased a Mercury VesselView. My compression check shows 80 lbs on 5 cylinders and on number 6 it reads 105. Mercury VesselView shows 820 hrs.
The service manual covering '94 thru '05, 3 and 4 cylinder 2 strokers in the Jet 60 thru 125 HP specifies: "Expect problems when compression drops below 120 PSIG. Variance between cylinders, 10-15% max.". Continuing on they said that cylinder to cylinder uniformity is more important than actual pressure within limits.
Re: 2006 mercury 15hp compression question The compression test should be done with both plugs out of the motor and the plug wires grounded out to the block. The prop removed and the throttle in the FWD wide open position so the cylinder's get plenty of air to compress. The pull rope should be very easy to pull when done this way. I bought a 1987 70 hp Mercury 2 stroke 3 cylinder. I mounted it on a 1973 16' Starcraft holiday anyway I took it to the lake for a short test run 1 hour. Runs purity good alittle bit of a rough idle never stalled starts easy not has bad as I have had from other 2 stroke 3 cylinders. Before I.
Hi All, I have an 6 hp mercury 2 cylinder 2 stroke. serial number 09573702. Motor was bought with the note that it would not run on low rpm. Tested is, cleaned out the carb and no avail. Compression test gave 90 psi on both banks ( pretty low in my opinion), spark is good. In order to check for. A two-stroke cylinder engine should have a compression reading of 110-130PSI. . How to Test Low Compression in One Cylinder Outboard. Well, testing the compression in one cylinder outboard takes a heck of a time. . Are Mercury Black Max 150 Motor Reliable & Good? Similar Posts. Boating. 6 Most Common Problems with Cobia Boat & Possible Fix. Can someone please give me a good number for compression on 1993 70hp Evinrude 3 cyl. . (neutral safety switch) if that might matter. I justified that in my head by thinking that the 2 stroke was getting enough air thru the crankcase and open plug holes. . Jul 13, 2017 #5 The throttle does not need to be open for a compression test. The .
2002 Mercury Outboard 150 hp Salt water series 2 stroke engine. Pressure test was performed with hot and cold engine using two different tester kits. One fr.
does anyone know the average PSI reading for 1985 Mercury inline 6 cylinders, 2 stroke?. i did a compression test on mine over the weekend and this is what i got: #1 35psi #2 0psi #3 to #6 50psii i read through the forum and. Mercury 2-stroke outboard motors are highly regarded in the boating world for their reliability, performance, and efficiency. However, like any mechanical device, they can occasionally encounter issues and require troubleshooting. In this blog post, we’ll explore common problems associated with Mercury 2-stroke outboard engines and provide detailed, . To check the compression on a 2-stroke outboard, you can try these steps: • Remove all spark plugs, clean, and dry the spark plug • Screw in the compression tester finger tight, one cylinder at a time • Ignition off, open the throttle to 100% • Crank the engine about 4x, until the gauge stops increasing • Record the reading • Repeat for each cylinderHere are some .
Re: Mercury Outboard 90hp 6 cyl 2 stroke - Bogs down past half throttle Mark, Perform a compression test. All cylinders should be 120+PSI. Next put a timing light on each plug wire in turn and see that each fire consistantly. If these two tests fail, post back the results.
Low compression on all 4 cyl's of 1985 Mercury 50 2-stroke. Thread starter rwbrown3; Start date Mar 17, 2018; R. rwbrown3 New member. Mar 17, 2018 . I guess my question is I have a compression tool to test compression myself, is it as simple as taking the plugs out and cranking the engine, I read somewhere that I needed to ground the spark .
MERCURY 115 HP INLINE 6 CYLINDER COMPRESSION test
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2 stroke 6 cylinder compression test mercury|How to Compression Test on Mercury 2