mercruiser 5.0 low compression test|Mercruiser 5.0L EFI , low cylinder compression on one cylinder : distributor I'm looking at buying a 24 foot 2004 deckboat with a Mercruiser 5.0 Bravo 3 (260 HP) that has 715 hours on it. The compression test results were as follows: 141, 149, 131, .
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1994 Mercruiser 5.0 runs fine at speed but idles a little rough & sometimes dies. Hard to restart when warm; must open throtle fully. #1 cyl only 30 psi and leakage probably .
I am looking at a 2001 boat with a 5.0L EFI Mercruiser engine with 55 hours. Here .Re: 5.0 Mercruiser compression readings. If you haven't already done so, replace the . I am looking at a 2001 boat with a 5.0L EFI Mercruiser engine with 55 hours. Here are the actual compression readings:1: 2102: 2103: 2054: 1905: 2156. Re: 5.0 Mercruiser compression readings. If you haven't already done so, replace the oil and filter, next I would proceed with the carb work and any other needed tune-up items, .
I'm looking at buying a 24 foot 2004 deckboat with a Mercruiser 5.0 Bravo 3 (260 HP) that has 715 hours on it. The compression test results were as follows: 141, 149, 131, . The combination of water and low compression Tells me bad head gasket. The common issue you refere to is only if the Two center cylinder head gasket went bad. If 1, 7, 2, .
mercruiser 5.0 alpha one compression test
I did a compression test with the left hand Exhaust Manifold and Riser removed, Sea Water Pump removed, Alternator removed, Thermostat housing removed. I removed . Merc Service manual for the engine, the manifold pressure seen by a vacuum gauge should be 15 to 21 inches HG at idle. The manifold pressure is reported in absolute PSI, . 1. You could have a valve train issue and still show good compression. Make sure the cam, pushrods and rockers are ok. 2. You could have good fuel rail pressure with a bad .
He did a compression test and all cylinders were OK but 2 and 4, which tested at 130 psi, but after he sprayed in some oil they tested normal. He wants to do a leak down test, but I'm not . Mercury MerCruiser Sterndrives & Engines. hi, i bought 21 beachcraft recently, it has m/c alpha 1 inboard engine. i think i got a pretty deal. i did a compression test. here is . Mercruiser 5.0 w.o.t. low RPMS. Thread starter poppagofast; Start date Jul 8, 2024; Jul 8, 2024 #1 P. poppagofast New Member. Jul 8, 2024 11 Boat Info 1998 Sea Ray 215 ec . Since new wires verify firing order, baseline with a compression test, verify ignition timing, check contents of fuel filter- pour into clear jar look for water phase . Re: Mercruiser 5.0 low compression #1 cyl It is a in depth ordeal the whole top of the motor comes off all exhaust intake distrubutor make sure you mark when you pull the distributor or put it at #1 cylinder it could take someone with mechanical skills probably half a day to have them off, when installing you need to adjust the valves and set timing, there are torq .
I have a 2005 searay with a mercuiser 5.0 260hp, bravo 3. After the engine overheated I had the compression tested 1)190 2)240 3)185 4)230 5)190 6)230 7)185 8)220. I am told the readings should be around 150 and the engine needs to be replaced. What would cause a high compression reading? Do.
I also discovered there is water mixed with the oil sump (the engine oil is milky as obtain from the dip stick). Prior to this issue the compression reported 150-180 PSI which is good. Any feedback will be appreciated; I will do another compression test, however form my experiences with motor vehicles the signs are pointing to cracked head gasket. The Mercruiser 5.0 MPI is a widely popular marine engine found in the heart of countless boats worldwide. Designed and manufactured by Mercury Marine, this powerhouse engine boasts a proven track record of performance, reliability, and efficiency. However, like any engine, the Mercruiser 5.0 MPI can have its fair share of problems. In this blog . Top . I'm looking at a boat that has full inboard Mercruiser 350 / 260. (not I/O) I had the compression checked and all cylinders were between 145 and 150. I know the consistency is good just don't know how "good" the numbers are. What does a marine 350 start our life with? The motor is a 1987 with about 890 hours on the clock. This video shows how to do a compression test on a marine gasoline sterndrive engine.
All even # cylinders (2,4,6,8) had water along with lots of water in oil on port engine It's 2006 MerCruiser 5.0 MPI serial # OW614502 with 425 hrs -- the boat is Chaparral 290 Signature with Twin 5.0 Engines are raw water cooled (sea water). Oil changed at the end of every season. We are. 1993 Mercruiser 7.4L with 135hrs on it. Did a compression test to see what was what, and was surprised to find lowest at 110psi and the highest at 125psi with most at 115-120. These seem pretty low to me, but maybe that is normal for this engine. I was expecting to see around 150 or so.
Exclusive audio alarm system that warns you of low oil pressure, high water temperature and excessive transmission temperature. Exclusive drive lube monitor conveniently located atop the engine for easy access. Compact hydraulic steering available for pontoon applications, which is offered as a factory-installed option on the Alpha drive packages. 4: if spark is good (jumps 1/2" gap) and the fuel in the tank is good, next I'd do a compression test on each cylinder. 5: if compression is good, spark is good and fuel in the tank is good, then we can conclude we've got a fuel issue. Mercruiser Sterndrive Forum . Merc 5.0l Lack of power no rpm over 3000rpm . Compression test Good Fuel pressure test good Scanned with diacom no codes all parameters in the game new plugs cap and rotor Replaced the exhaust water shutters Cleaned all debris from exhaust. . List of possible causes of low WOT (Wide Open Throttle) rpm. In no . 2011 Tahoe Q7SSi, 5.0 MPI Mercruiser with less than 5 hrs. Took it out yesterday and it ran great, however after about 3 hrs, an alarm sounded. Single beep every 2 or 3 minutes, (or so). Still running OK, oil pressure looked fine, temp fine, couldn't find an obvious explanation. The only thing.
Mike please scroll up to post 26, that's where I posted the compression test results. I may end up having the leak down test done, but I'm very skeptical that this will fail. Remember, the low 12 in. vacuum is "Steady" at idle, it does not fluctuate. I should also point out, it's 12 in Hg, not 12 psi. 12 in Hg is around 9 psi.
Is this good compression on a 9 year old 5.0 Mercruiser? OW062132 claiming to have 50 hours. 145, 150, 140, 145, 145, To test for spark which includes intensity and "power level" a spark checking device is best so you can see the spark itself. Many types are available. I like the ones with spark plug wires and a plastic tube with two metal points .
Compression- good (158-180 psi.) Replaced fuel filter, pump, cooling hose kit, fuel relay(bad) Fuel rail pressure test- good Replaced spark plugs Replaced cap and rotor Replaced IAC Computer was replaced 150 hrs. ago The only things I can think of now are: . for a favour our local mercruiser guy reckoned he found the problem and replaced all . Ford 4.9L Engine Compression Test, Ford 5.0L Engine Compression Test, Ford 5.8L Engine Compression Test. Dry and Wet Engine Compression Tests explained. Home; Chrysler . One or more cylinders had a low compression value compared to the others. This could be normal or it could be causing a problem. To find out if the compression values are .
The combination of water and low compression Tells me bad head gasket. The common issue you refere to is only if the Two center cylinder head gasket went bad. If 1, 7, 2, 8 cyl go then it can be only one. If you want to do a leakdown test that is ok also. There are many ways to check for water leaks You can do a smoke test on the water system
Customer: Hi, I have an 02 mercruiser 5.0 mpi and I have loss of power under load and cant exceed 3000 rpm. Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic .
As far as the compression numbers, i would crank it till the gauge wouldnt go up any more. i found it intresting that, for example, #1 would test at 120, then i would test another cyl, go back to #1 and it would get 130. I plan to squirt some oil in the cyls and redo the comp test. I would also like to get another gauge to confirm the results. 2005 Mercruiser 5.0 MPI. Engine idles perfectly, but as I advance the throttle in gear it starts to get a misfire around 1500 RPM. It feels as if the ECU transitions from idle to power at that point. At 2000 RPM, the engine runs the roughest and it will not go past 3000 RPM. The spark plugs were. Mercruiser 5.0 low RPM's under load. Thread starter Strokin99; Start date Aug 12, 2014; S. Strokin99 Cadet. Joined Aug 12, 2014 Messages 6. Aug 12, 2014 #1 . it appears to have3 wires within the plug. So when I test it should I just remove this plug for a minute and run the boat. alldodge Moderator. Staff member. Joined Mar 8, 2009 Messages . This appears low. Going to repeat the compression test... 2006 Maxum 2600SE with Merc 5.0L MPI/Bravo III. Comment. Post Cancel. iceman11. Frequent Contributor. Join Date: Oct 2010; Posts: 72 #17. 08-27-2017, 09:59 AM. . Strangely the Mercruiser service manual only has this spec for compression:
Re: Low water PSI..Mercruiser 5.0 MPI with Bravo 3 pbuzz, My low water pressure was traced back to a worn brass pump housing like you have. I think what Don and others here are trying to tell you is Mercruiser doesn't need there stuff redesigned, there is a problem that needs to be fixed. An engine compression test is the most practical way, to learn why you may have, low or no engine compression. There are some other causes of low engine compression, but these are by far the most common: Leaking valves. Leaking piston rings. Excessive carbon buildup. Broken valve spring. Blown head gasket. Worn camshaft. Bent . Hi! I am new to this forum, and have my eye on a 1990 Regal 290 Commodore.. It has twin 5.0's (220 hp) with Alpha 1's with 800 hours on them.
Very Low Compessions on Mercruiser 5.0 MPI Engine. with
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mercruiser 5.0 low compression test|Mercruiser 5.0L EFI , low cylinder compression on one cylinder