compression test 4.3 mercruiser|Compression Test : traders The best way to do a compression test and a leak-down test, demonstrated on my boat's Mercruiser (Chevy-block) engine. Good demonstration with lots of explanation and .
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Test driving a boat this Friday and will be doing a compression test obviously. The service bulletin says to remove the ignition coil wire and ground it to the grounding stud. Why .Here's the service bulletin on doing a compression test. Make sure you get 4 . Mercury MerCruiser Sterndrives & Engines. 1990 4.3L LX with 670 hours. D428255. Alpha 1 out drive. Troubleshooting a WOT issue and lack of power. Performed a . I'll perform a compression test on my 4.3 V6 CSFI equipped S10, and want to know whats the ideal compression reading. I'll use the .
5.0 Mercruiser, Alpha One gen 2. I've never disabled the fuel pump, get it hot, pull all the plugs out, throttle wide open, pull the coil wire of the the distributor and ground to block. . The best way to do a compression test and a leak-down test, demonstrated on my boat's Mercruiser (Chevy-block) engine. Good demonstration with lots of explanation and .
This video shows how to do a compression test on a marine gasoline sterndrive engine.
Use a compression test to identify any blown head gaskets or cracked engine blocks. Replace the affected seals or gaskets and reassemble the engine. Slow Engine . According to Mercruiser on a cold compression test all cylinders should exceed 100psi and the lowest cylinder should be within 70% of the highest. In your case it is close the . I have a 2001 Glastron with a 4.3 Mercruiser engine. The engine did not get drained and winterized properly last fall. I found a soft plug that was popped out of the left side of the motor. I replaced the plug, hooked the water muff up to the outdrive and started the engine and let it run for.Potential Causes of Overheating in Mercruiser 4.3 Engines. Overheating in your Mercruiser 4.3 engine can lead to serious damage and potentially ruin your boating experience. Understanding the potential causes and taking .
Customer: I just had compression testing done on twin 1991 Mercruiser 4.3 v6 Cylinders measured initially between 90 and 138. They did a engine treatment with Power Tune and compression is now between 120 and 138. Never heard of power tuning?? and are these readings within an acceptable range for an engine with 700 hours on them? Mercruiser Sterndrive Forum . 4.3L Merc Compression problems . they informed me my boat is still running the same and that i have no compression on cylinders 2 and 5. So regardless to say i raised sh*t got some of my money back and pulled my boat out of there. . i did a leak test and springs, rods, rockers are all straight and in good shape . what is the standard compession reading in lbs. Re: 4.3 l mercruiser vortec compression test You're looking for Close Variations Between Cylinders, rather than a maximun/minimun #...10% differences is Good. I have a 1996 Mercruiser 4.3 with alpha one. The boat has been running fine all season, until today. . Compression test shows all ok. There is no sign of any water in the oil. Anyone have any suggestions? The engine is fully covered and the bilge is dry so no chance of standing water getting into the carb. . you can test the risers on the .
Re: 1990 4.3 LX 6 cyl Mercruiser that stutters and bog in the high rpms When was the las time it had a full tuneup? New plugs, cap and rotor? I would also suggest a compression test before you do the on the water test with the remote tank. List of possible causes of low WOT (Wide Open Throttle) rpm. In no particular order
Did compression test #1-200;#2-170;#3-200;#4-230;#5-195;#6-190 Thought maybe a cracked block, head gasket, intake gasket or intake, so I pressure tested the cooling system to 20 lbs for 20 min, found no leaks and pressure did not drop, so if I am correct, that would eliminate the head, intake gaskets and the intake.This was done on a cold . Re: 4.3 Mercruiser backfires @ 4000rpm and above Forgot to mention did a compression test and got 180-185 across the board. I was thinking more fuel side since it does have a surge. which feels like lack of fuel. Once it is on the slow side of the surge, then it will backfire thru the carb a couple times. The 4.3 Mercruiser is in a 21' Bayliner trophy and has performed excellent since new purchase. In July 2008 it began to run rough and lack power to accelerate and plane quickly. . fuel filter, new gasoline, new plugs (993's), new coil and compression test. The compression test was excellent - 170+ and consistent among cylanders. I have had it . Re: 4.3 Mercruiser operating temps? Overheating? Recommend you follow the instructions of posts 12 and 15. Also, did you test the thermostat when you took it out? (in a pot of water with a thermometer?) Not good to run without the t-stat.. Sounds like you have some blockage, maybe from a previous impeller problem (even before your last one).
Re: 4.3 MerCruiser Lack of Power A good place to start on that list is a compression test if you haven't done one. Verify that the mechanical health of the engine is up to snuff before you start spending lots of time and money on all the other parts. Re: Mercruiser 4.6 LX Re: Mercruiser 4.6 LX Utah - Plugs fouled with oil. The boat is in the water (died there, no where to take out unless I get it towed). My husband is going to find someone who has a compression tester. Here is the Mercruiser ignition test procedure. Try this and report back vs swapping out the kitchen sink approach. . Compression test the whole engine, If you are hanging an intake valve, it will never start, no vacuum. . (1--8-4-3-6-5-7-2) Your V6 should be (1-6-5-4-3-2) Both V8 and V6 should be in the direction of rotor rotation. Use a compression test to identify any blown head gaskets or cracked engine blocks. Replace the affected seals or gaskets and reassemble the engine. Slow Engine Performance Fix: Check and replace the air filter. Clean or replace the fuel injector. Verify spark plug condition and replacement if needed. Inspect and replace the ignition coil if .
Good day. I have a 1995 Chaparral with 4.3 v6 GM. At the lake I experienced a severe power loss. Got home and performed compression test to find zero compression on #2 cylinder. Removed head and there it was, burned exhaust valve. I will replace it after touching up the seat, but what could. Mercruiser MAG 350 MPI 2005 -No compression on one cylinder. Thread starter gcarmich; Start date Nov 23, 2021; G. gcarmich Seaman. Joined Jan 8, 2009 Messages 52. Nov 23, 2021 . At first I thought the outdrive was not trimming properly but I did an compression test and discovered one cylinder has no compression and another cylinder on .
Hello every one. I'm taking a boat on a sea trial this week and I have a few questions about the motor. It's a 94 mercruiser 3.0 lx with an alpha one gen 2. Before I buy the boat I wanted to do a sea trial and a compression test. Should I do the compression test after the sea trial or before.
I'm not the most mechanically knowledgeable person around, should the following compression readings raise any red flags? Cylinder compression is reported to be: 1. 140 2. 140 3. 125 4. 125 5. 130 6. 130 Engine is a 2000 model, no information.
I have a 4.3 mercruiser with EFI which has smoke on start up and coming from propeller when running. I'm burning some oil but not an excessive amount. I'm running 4 quarts of Rotella 15-40 oil with a quart of lucas oil stabilizer. I took the plugs out for a compression test and they are wet with a tan color.
Re: 4.3 Mercruiser I/O not wanting to plane and short on power. Start with the basics. Do a compression test and check the timing. Do a full tune-up including distributor cap and rotor. There is no way you can tell if a carb has a clogged internal passage by looking at it. I have mercruiser 4.3 v6 1998 it is running perfect no temp issues oil pressure all good. They only problem I have is an annoying knocking sound when it sits on idle seems to becoming from the timing chain area? . Have you done a compression test? May just be a bad valve, although noise is a little "heavy" for that. Worth checking out .
So far I've done a compression test (175-180lbs in all cylinders) - tested manifolds - checked intake gaskets (couldn't find any breakage or signs of a bad gasket) . Water in top of 4.3 mercruiser - hydrolocked once - pictures! It Sounds like Don S. and Bond-o (2 of the best Merc Gurus on this site) correctly trouble shot the problem to a bad .
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Hello everyone, I want to pressure test the water jacket/cooling system of my 4.3 l mercruiser engine for leaks/cracks. I have spent weeks trying to find a clear cut way to do this. I am unsure of what hoses need to be plugged. I appreciate the help in advance. Re: 1989 Mercruiser 4.3 first things first .. do the compression test .pull all plugs , ground coil wire and open carb throttle plates turn the engine over 3 compression strokes per cylinder and report the readings back here .. the summer season is over and Ive decided to do a compression test on my engine. Here are the results, what do you think? Warm engine, WOT, DRY TEST: #6 - 170 psi #5 - 145-148 psi #4 - 175 psi #3 - 175 psi #2 - 178 psi #1 - 170 psi I did WET test on #5 (added 5ml - tea spoon of 25W40) and #5 jumped to 162, 165 psi. Here are the plugs: drained the oil out of the pan and it was also the same color. took the oil filler neck off of the valve cover and had some "crisco" like material in it. engine does not run hot. one thing i did notice, is that the starboard side manifold gets warmer than the other. i did a compression check on it and it was between 120-132 psi on all cylinders.
Mercruiser Gasoline Engine Compressio
Mercruiser 4.3L Compression Test
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compression test 4.3 mercruiser|Compression Test