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#1
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How does it turn over by hand with the plugs out? Any signs of aluminum on the sleeves when you pulled the heads? The uniform reading across the board makes me think the same as BS does, bad guage. IIRC them there 2.4's are chrome bore engines(or NICASIL for the XR4). Pretty tough to tear em up, but if you do it's normally cheaper to find a good used powerhead to swap out. You either have to re-plate them(NOT CHEAP), or have sleeves put in for around $200 a hole.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#2
07-06-2008, 02:42 PM
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THEFERM, It turns over very easy by hand without the plugs and I found no sign of aluminum when I pulled the heads.The sleeves are smooth and shiny with no scoring whatsoever. Could it be the piston rings going bad due to overheating?
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#3
07-06-2008, 02:51 PM
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The rings could have collapsed, but that is not very likely with keystone beveled rings. If your want to find out if it's the rings, put a tablespoon of oil in the cylinder then do a compression test and see if the numbers go way up. If they do then it could be your rings.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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#4
08-16-2008, 03:06 PM
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With all electrical components out, I was removing the manifold and I got to thinking... Since the cylinders and the exhaust are interconnected, is it possible that the overheating burned parts of the two gaskets that go in between the cover and divider plate creating a leak and thus the reason for my low compression on all cylinders? What do you think...maybe, possible or just wishful thinking?
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#5
08-16-2008, 05:42 PM
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I doubt that is it. But you can get a better look at the pistons by removing the exhaust plate and divider. Rotate the crank by hand and look at the sides of the pistons thru the exhaust ports. Its just odd that they are all down the same amount
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#6
08-17-2008, 08:28 PM
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Sorry Builder. That's definitely not the problem.
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#7
08-24-2008, 07:17 AM
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Checking Craiglist I found a 1988 Merc with a rebuilt power head asking $900.00. Called the guy up and when he gives me his address, he’s three blocks south of me off the main avenue. Motor is OK; check compression and all cylinders at 115-117 psi. No spark on three cylinders (figured is the power packs) and he sold it to me $700.00. Anyway, he brought his boat to my house, helped me remove my motor and replace it with his. Except for my blown power head, I’ve got spares for everything. I will be going to work on it today and hopefully the spark issue can be resolved by exchanging the power parks.
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#8
08-24-2008, 12:27 PM
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The beauty of having a parts engine, it's a wonderful thing.
__________________
2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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