Asheara
02.05.2021 10:59:52
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Re: 2002 Mercury 150Hp xr6 Compression and overall reliability of outboard [links]
What to look out for is one or two cylinders that compress more than 10% below the rest. If all 6 are within a 10% span the engine is probably healthy mechanically.
Re: 2002 Mercury 150Hp xr6 Compression and overall reliability of outboard here
Is there and hour meter on these motors?
Seller says you need to change thermastats on the motor every year? Why? here
All,
I'm new to the forum. I'm looking for some advice/help with a potential boat purchase. I'm looking to purchase a new boat with a 2002 200hp Optimax with roughly 490 hours. I have compression info.
Lastly, total hours don't seem all that high but I'm interested in others perspectives. Again, my non-mechanic rule of thumb I've heard is that most 2-stroke outboards should have a normal life expectancy of 1500-2000 hours (equivalent of 100k miles on a car). Obviously there are many flavors - some guys blow a powerhead in 100 hours and others run the same motor w/o major repair for 2500+. here
I also have the serial # if someone has access to a merc-certified diagnostic terminal. [links]
As mentioned earlier, testing the compression of all 8 cylinders is one of the most overlooked troubleshooting tests. But, before jumping into this test, you should first verify that the misfire is not spark related.
OK, so you tested all 8 cylinders and you've got those readings on paper, what now?
Once you've found the 'dead' cylinder, the next step is to find out what's causing the low compression value. For this step, go to: TEST 2: Wet Compression Test.
Let's take a look at what your test results mean: [links]
Do not use any type of tool to tightened the compression tester, hand tight is fine. here
Add a small amount of engine oil to the cylinder that reported low compression or no compression in the ‘Dry’ compression test more
1) Which one to buy: The engine compression tester that I have always used is the Actron CP7827 Compression Tester Kit. My only complaint about this engine compression tester is that it does not come with a case to store it in.
Once the needle stops climbing, have your helper stop cranking the engine. Repeat this test twice, and record the second reading on a piece of paper. [links]
NOTE: The engine should NOT be HOT (normal operating temperature) and yet, it should be not be COLD. So, if you've just turned off the engine, after an extended run time, let it cool down about 30 minutes. If the engine is cold, start’er up and let’er run about 15 minutes. If the engine in your vehicle doesn't start, then don't worry about it being warm or not for the test, since a compression test can still be done. more
This article is a part of a series of articles that explore the different tests that are done to find the exact cause of a misfire condition on the 4.6L and 5.4L equipped Ford and Mercury vehicles. The series starts with the article: How To Diagnose Misfire Codes Ford 4.6l & 5.4L 8 Cylinder (P0300-P0308).