|
|
#1
|
||||
|
||||
Johnson 25hp water lower cyl
hi guys i have an old 25hp that when u idle idle in the water the lower cylinder miss fires . its getting water in it. could the head be the cause of it or the lower crank shaft seal .if it was the lower seal wouldnt it afect both cylinders. want to save doing extra work to fix the old girl .also want to use her for a aux when i test run my boat
|
|
#2
06-29-2011, 08:23 PM
|
||||
|
||||
|
Look at the head gasket.
I had two that leaked there. If it's not obvious, look for a different color somewhere around the metal portion of the gasket and check the head or block for a pit in that location.
__________________
 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
|
|
#3
06-29-2011, 08:30 PM
|
||||
|
||||
|
I would also check the head gasket.
__________________
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 
|
|
#4
06-29-2011, 11:05 PM
|
||||
|
||||
|
X3...What Tsubaki and TheFermanator just said.. Head gasket... and to narrow it down even further, check the lower part of the gasket, since that's the cylinder that's getting water in it.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless. Last edited by Destroyer; 06-29-2011 at 11:11 PM.
|
|
#6
06-30-2011, 05:57 AM
|
||||
|
||||
|
I've seen Yamaha's corrode thru the lower water jacket in the head, they would check good on a compression test, but when I ran it, it would miss, finally got bad enough when I was spinning the engine over with the plugs out, it would spit water out of the plug hole. From what I've seen on Johnson, I'd do what every one else suggested and check the head gasket
|
 |
|
|
Linear Mode
